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authorauth12 <[email protected]>2020-07-22 08:40:38 -0700
committerauth12 <[email protected]>2020-07-22 08:40:38 -0700
commit4ff89e85e74884e8f04edb5c31a94b4323e895e9 (patch)
tree65f98ebf9af0d0947e44bf397b1fac0f107d7a2f /client/wolfssl/wolfcrypt/src/tfm.c
parentClient injection. (diff)
downloadloader-4ff89e85e74884e8f04edb5c31a94b4323e895e9.tar.xz
loader-4ff89e85e74884e8f04edb5c31a94b4323e895e9.zip
Removed wolfssl
Diffstat (limited to 'client/wolfssl/wolfcrypt/src/tfm.c')
-rw-r--r--client/wolfssl/wolfcrypt/src/tfm.c5068
1 files changed, 0 insertions, 5068 deletions
diff --git a/client/wolfssl/wolfcrypt/src/tfm.c b/client/wolfssl/wolfcrypt/src/tfm.c
deleted file mode 100644
index 61b31f0..0000000
--- a/client/wolfssl/wolfcrypt/src/tfm.c
+++ /dev/null
@@ -1,5068 +0,0 @@
-/* tfm.c
- *
- * Copyright (C) 2006-2020 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * wolfSSL is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
-
-
-
-/*
- * Based on public domain TomsFastMath 0.10 by Tom St Denis, [email protected],
- * http://math.libtomcrypt.com
- */
-
-/**
- * Edited by Moises Guimaraes ([email protected])
- * to fit wolfSSL's needs.
- */
-
-#ifdef HAVE_CONFIG_H
- #include <config.h>
-#endif
-
-/* in case user set USE_FAST_MATH there */
-#include <wolfssl/wolfcrypt/settings.h>
-#ifdef NO_INLINE
- #include <wolfssl/wolfcrypt/misc.h>
-#else
- #define WOLFSSL_MISC_INCLUDED
- #include <wolfcrypt/src/misc.c>
-#endif
-
-#ifdef USE_FAST_MATH
-
-#include <wolfssl/wolfcrypt/random.h>
-#include <wolfssl/wolfcrypt/tfm.h>
-#include <wolfcrypt/src/asm.c> /* will define asm MACROS or C ones */
-#include <wolfssl/wolfcrypt/wolfmath.h> /* common functions */
-
-#if defined(FREESCALE_LTC_TFM)
- #include <wolfssl/wolfcrypt/port/nxp/ksdk_port.h>
-#endif
-#ifdef WOLFSSL_DEBUG_MATH
- #include <stdio.h>
-#endif
-
-#ifdef USE_WINDOWS_API
- #pragma warning(disable:4127)
- /* Disables the warning:
- * 4127: conditional expression is constant
- * in this file.
- */
-#endif
-
-#if defined(WOLFSSL_HAVE_SP_RSA) || defined(WOLFSSL_HAVE_SP_DH)
-#ifdef __cplusplus
- extern "C" {
-#endif
-WOLFSSL_LOCAL int sp_ModExp_1024(mp_int* base, mp_int* exp, mp_int* mod,
- mp_int* res);
-WOLFSSL_LOCAL int sp_ModExp_1536(mp_int* base, mp_int* exp, mp_int* mod,
- mp_int* res);
-WOLFSSL_LOCAL int sp_ModExp_2048(mp_int* base, mp_int* exp, mp_int* mod,
- mp_int* res);
-WOLFSSL_LOCAL int sp_ModExp_3072(mp_int* base, mp_int* exp, mp_int* mod,
- mp_int* res);
-WOLFSSL_LOCAL int sp_ModExp_4096(mp_int* base, mp_int* exp, mp_int* mod,
- mp_int* res);
-#ifdef __cplusplus
- } /* extern "C" */
-#endif
-#endif
-
-
-#ifndef WOLFSSL_SP_MATH
-/* math settings check */
-word32 CheckRunTimeSettings(void)
-{
- return CTC_SETTINGS;
-}
-#endif
-
-/* math settings size check */
-word32 CheckRunTimeFastMath(void)
-{
- return FP_SIZE;
-}
-
-
-/* Functions */
-
-void fp_add(fp_int *a, fp_int *b, fp_int *c)
-{
- int sa, sb;
-
- /* get sign of both inputs */
- sa = a->sign;
- sb = b->sign;
-
- /* handle two cases, not four */
- if (sa == sb) {
- /* both positive or both negative */
- /* add their magnitudes, copy the sign */
- c->sign = sa;
- s_fp_add (a, b, c);
- } else {
- /* one positive, the other negative */
- /* subtract the one with the greater magnitude from */
- /* the one of the lesser magnitude. The result gets */
- /* the sign of the one with the greater magnitude. */
- if (fp_cmp_mag (a, b) == FP_LT) {
- c->sign = sb;
- s_fp_sub (b, a, c);
- } else {
- c->sign = sa;
- s_fp_sub (a, b, c);
- }
- }
-}
-
-/* unsigned addition */
-void s_fp_add(fp_int *a, fp_int *b, fp_int *c)
-{
- int x, y, oldused;
- fp_word t;
-
- y = MAX(a->used, b->used);
- oldused = MIN(c->used, FP_SIZE); /* help static analysis w/ largest size */
- c->used = y;
-
- t = 0;
- for (x = 0; x < y; x++) {
- t += ((fp_word)a->dp[x]) + ((fp_word)b->dp[x]);
- c->dp[x] = (fp_digit)t;
- t >>= DIGIT_BIT;
- }
- if (t != 0 && x < FP_SIZE) {
- c->dp[c->used++] = (fp_digit)t;
- ++x;
- }
-
- c->used = x;
-
- /* zero any excess digits on the destination that we didn't write to */
- for (; x < oldused; x++) {
- c->dp[x] = 0;
- }
- fp_clamp(c);
-}
-
-/* c = a - b */
-void fp_sub(fp_int *a, fp_int *b, fp_int *c)
-{
- int sa, sb;
-
- sa = a->sign;
- sb = b->sign;
-
- if (sa != sb) {
- /* subtract a negative from a positive, OR */
- /* subtract a positive from a negative. */
- /* In either case, ADD their magnitudes, */
- /* and use the sign of the first number. */
- c->sign = sa;
- s_fp_add (a, b, c);
- } else {
- /* subtract a positive from a positive, OR */
- /* subtract a negative from a negative. */
- /* First, take the difference between their */
- /* magnitudes, then... */
- if (fp_cmp_mag (a, b) != FP_LT) {
- /* Copy the sign from the first */
- c->sign = sa;
- /* The first has a larger or equal magnitude */
- s_fp_sub (a, b, c);
- } else {
- /* The result has the *opposite* sign from */
- /* the first number. */
- c->sign = (sa == FP_ZPOS) ? FP_NEG : FP_ZPOS;
- /* The second has a larger magnitude */
- s_fp_sub (b, a, c);
- }
- }
-}
-
-/* unsigned subtraction ||a|| >= ||b|| ALWAYS! */
-void s_fp_sub(fp_int *a, fp_int *b, fp_int *c)
-{
- int x, oldbused, oldused;
- fp_word t;
-
- oldused = c->used;
- oldbused = b->used;
- c->used = a->used;
- t = 0;
- for (x = 0; x < oldbused; x++) {
- t = ((fp_word)a->dp[x]) - (((fp_word)b->dp[x]) + t);
- c->dp[x] = (fp_digit)t;
- t = (t >> DIGIT_BIT)&1;
- }
- for (; x < a->used; x++) {
- t = ((fp_word)a->dp[x]) - t;
- c->dp[x] = (fp_digit)t;
- t = (t >> DIGIT_BIT)&1;
- }
-
- /* zero any excess digits on the destination that we didn't write to */
- for (; x < oldused; x++) {
- c->dp[x] = 0;
- }
- fp_clamp(c);
-}
-
-/* c = a * b */
-int fp_mul(fp_int *A, fp_int *B, fp_int *C)
-{
- int ret = 0;
- int y, yy, oldused;
-
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- ret = esp_mp_mul(A, B, C);
- if(ret != -2) return ret;
-#endif
-
- oldused = C->used;
-
- y = MAX(A->used, B->used);
- yy = MIN(A->used, B->used);
-
- /* call generic if we're out of range */
- if (y + yy > FP_SIZE) {
- ret = fp_mul_comba(A, B, C);
- goto clean;
- }
-
- /* pick a comba (unrolled 4/8/16/32 x or rolled) based on the size
- of the largest input. We also want to avoid doing excess mults if the
- inputs are not close to the next power of two. That is, for example,
- if say y=17 then we would do (32-17)^2 = 225 unneeded multiplications
- */
-
-#if defined(TFM_MUL3) && FP_SIZE >= 6
- if (y <= 3) {
- ret = fp_mul_comba3(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL4) && FP_SIZE >= 8
- if (y == 4) {
- ret = fp_mul_comba4(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL6) && FP_SIZE >= 12
- if (y <= 6) {
- ret = fp_mul_comba6(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL7) && FP_SIZE >= 14
- if (y == 7) {
- ret = fp_mul_comba7(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL8) && FP_SIZE >= 16
- if (y == 8) {
- ret = fp_mul_comba8(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL9) && FP_SIZE >= 18
- if (y == 9) {
- ret = fp_mul_comba9(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL12) && FP_SIZE >= 24
- if (y <= 12) {
- ret = fp_mul_comba12(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL17) && FP_SIZE >= 34
- if (y <= 17) {
- ret = fp_mul_comba17(A,B,C);
- goto clean;
- }
-#endif
-
-#if defined(TFM_SMALL_SET) && FP_SIZE >= 32
- if (y <= 16) {
- ret = fp_mul_comba_small(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL20) && FP_SIZE >= 40
- if (y <= 20) {
- ret = fp_mul_comba20(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL24) && FP_SIZE >= 48
- if (yy >= 16 && y <= 24) {
- ret = fp_mul_comba24(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL28) && FP_SIZE >= 56
- if (yy >= 20 && y <= 28) {
- ret = fp_mul_comba28(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL32) && FP_SIZE >= 64
- if (yy >= 24 && y <= 32) {
- ret = fp_mul_comba32(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL48) && FP_SIZE >= 96
- if (yy >= 40 && y <= 48) {
- ret = fp_mul_comba48(A,B,C);
- goto clean;
- }
-#endif
-#if defined(TFM_MUL64) && FP_SIZE >= 128
- if (yy >= 56 && y <= 64) {
- ret = fp_mul_comba64(A,B,C);
- goto clean;
- }
-#endif
- ret = fp_mul_comba(A,B,C);
-
-clean:
- /* zero any excess digits on the destination that we didn't write to */
- for (y = C->used; y >= 0 && y < oldused; y++) {
- C->dp[y] = 0;
- }
-
- return ret;
-}
-
-void fp_mul_2(fp_int * a, fp_int * b)
-{
- int x, oldused;
-
- oldused = b->used;
- b->used = a->used;
-
- {
- fp_digit r, rr, *tmpa, *tmpb;
-
- /* alias for source */
- tmpa = a->dp;
-
- /* alias for dest */
- tmpb = b->dp;
-
- /* carry */
- r = 0;
- for (x = 0; x < a->used; x++) {
-
- /* get what will be the *next* carry bit from the
- * MSB of the current digit
- */
- rr = *tmpa >> ((fp_digit)(DIGIT_BIT - 1));
-
- /* now shift up this digit, add in the carry [from the previous] */
- *tmpb++ = ((*tmpa++ << ((fp_digit)1)) | r);
-
- /* copy the carry that would be from the source
- * digit into the next iteration
- */
- r = rr;
- }
-
- /* new leading digit? */
- if (r != 0 && b->used != (FP_SIZE-1)) {
- /* add a MSB which is always 1 at this point */
- *tmpb = 1;
- ++(b->used);
- }
-
- /* zero any excess digits on the destination that we didn't write to */
- tmpb = b->dp + b->used;
- for (x = b->used; x < oldused; x++) {
- *tmpb++ = 0;
- }
- }
- b->sign = a->sign;
-}
-
-/* c = a * b */
-void fp_mul_d(fp_int *a, fp_digit b, fp_int *c)
-{
- fp_word w;
- int x, oldused;
-
- oldused = c->used;
- c->used = a->used;
- c->sign = a->sign;
- w = 0;
- for (x = 0; x < a->used; x++) {
- w = ((fp_word)a->dp[x]) * ((fp_word)b) + w;
- c->dp[x] = (fp_digit)w;
- w = w >> DIGIT_BIT;
- }
- if (w != 0 && (a->used != FP_SIZE)) {
- c->dp[c->used++] = (fp_digit) w;
- ++x;
- }
-
- /* zero any excess digits on the destination that we didn't write to */
- /* also checking FP_SIZE here for static analysis */
- for (; x < oldused && x < FP_SIZE; x++) {
- c->dp[x] = 0;
- }
- fp_clamp(c);
-}
-
-/* c = a * 2**d */
-void fp_mul_2d(fp_int *a, int b, fp_int *c)
-{
- fp_digit carry, carrytmp, shift;
- int x;
-
- /* copy it */
- fp_copy(a, c);
-
- /* handle whole digits */
- if (b >= DIGIT_BIT) {
- fp_lshd(c, b/DIGIT_BIT);
- }
- b %= DIGIT_BIT;
-
- /* shift the digits */
- if (b != 0) {
- carry = 0;
- shift = DIGIT_BIT - b;
- for (x = 0; x < c->used; x++) {
- carrytmp = c->dp[x] >> shift;
- c->dp[x] = (c->dp[x] << b) + carry;
- carry = carrytmp;
- }
- /* store last carry if room */
- if (carry && x < FP_SIZE) {
- c->dp[c->used++] = carry;
- }
- }
- fp_clamp(c);
-}
-
-/* generic PxQ multiplier */
-#if defined(HAVE_INTEL_MULX)
-
-WC_INLINE static int fp_mul_comba_mulx(fp_int *A, fp_int *B, fp_int *C)
-
-{
- int ix, iy, iz, pa;
- fp_int *dst;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[1];
-#else
- fp_int *tmp;
-#endif
-
- /* Variables used but not seen by cppcheck. */
- (void)ix; (void)iy; (void)iz;
-
-#ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (tmp == NULL)
- return FP_MEM;
-#endif
-
- /* get size of output and trim */
- pa = A->used + B->used;
- if (pa >= FP_SIZE) {
- pa = FP_SIZE-1;
- }
-
- /* Always take branch to use tmp variable. This avoids a cache attack for
- * determining if C equals A */
- if (1) {
- fp_init(tmp);
- dst = tmp;
- }
-
- TFM_INTEL_MUL_COMBA(A, B, dst) ;
-
- dst->used = pa;
- dst->sign = A->sign ^ B->sign;
- fp_clamp(dst);
- fp_copy(dst, C);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
-
- return FP_OKAY;
-}
-#endif
-
-int fp_mul_comba(fp_int *A, fp_int *B, fp_int *C)
-{
- int ret = 0;
- int ix, iy, iz, tx, ty, pa;
- fp_digit c0, c1, c2, *tmpx, *tmpy;
- fp_int *dst;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[1];
-#else
- fp_int *tmp;
-#endif
-
- IF_HAVE_INTEL_MULX(ret = fp_mul_comba_mulx(A, B, C), return ret) ;
-
-#ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (tmp == NULL)
- return FP_MEM;
-#endif
-
- COMBA_START;
- COMBA_CLEAR;
-
- /* get size of output and trim */
- pa = A->used + B->used;
- if (pa >= FP_SIZE) {
- pa = FP_SIZE-1;
- }
-
- /* Always take branch to use tmp variable. This avoids a cache attack for
- * determining if C equals A */
- if (1) {
- fp_init(tmp);
- dst = tmp;
- }
-
- for (ix = 0; ix < pa; ix++) {
- /* get offsets into the two bignums */
- ty = MIN(ix, (B->used > 0 ? B->used - 1 : 0));
- tx = ix - ty;
-
- /* setup temp aliases */
- tmpx = A->dp + tx;
- tmpy = B->dp + ty;
-
- /* this is the number of times the loop will iterate, essentially its
- while (tx++ < a->used && ty-- >= 0) { ... }
- */
- iy = MIN(A->used-tx, ty+1);
-
- /* execute loop */
- COMBA_FORWARD;
- for (iz = 0; iz < iy; ++iz) {
- fp_digit _tmpx = *tmpx++;
- fp_digit _tmpy = *tmpy--;
- MULADD(_tmpx, _tmpy);
- }
-
- /* store term */
- COMBA_STORE(dst->dp[ix]);
- }
- COMBA_FINI;
-
- dst->used = pa;
- dst->sign = A->sign ^ B->sign;
- fp_clamp(dst);
- fp_copy(dst, C);
-
- /* Variables used but not seen by cppcheck. */
- (void)c0; (void)c1; (void)c2;
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return ret;
-}
-
-/* a/b => cb + d == a */
-int fp_div(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
-{
- int n, t, i, norm, neg;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int q[1], x[1], y[1], t1[1], t2[1];
-#else
- fp_int *q, *x, *y, *t1, *t2;
-#endif
-
- /* is divisor zero ? */
- if (fp_iszero (b) == FP_YES) {
- return FP_VAL;
- }
-
- /* if a < b then q=0, r = a */
- if (fp_cmp_mag (a, b) == FP_LT) {
- if (d != NULL) {
- fp_copy (a, d);
- }
- if (c != NULL) {
- fp_zero (c);
- }
- return FP_OKAY;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- q = (fp_int*)XMALLOC(sizeof(fp_int) * 5, NULL, DYNAMIC_TYPE_BIGINT);
- if (q == NULL) {
- return FP_MEM;
- }
- x = &q[1]; y = &q[2]; t1 = &q[3]; t2 = &q[4];
-#endif
-
- fp_init(q);
- q->used = a->used + 2;
-
- fp_init(t1);
- fp_init(t2);
- fp_init_copy(x, a);
- fp_init_copy(y, b);
-
- /* fix the sign */
- neg = (a->sign == b->sign) ? FP_ZPOS : FP_NEG;
- x->sign = y->sign = FP_ZPOS;
-
- /* normalize both x and y, ensure that y >= b/2, [b == 2**DIGIT_BIT] */
- norm = fp_count_bits(y) % DIGIT_BIT;
- if (norm < (int)(DIGIT_BIT-1)) {
- norm = (DIGIT_BIT-1) - norm;
- fp_mul_2d (x, norm, x);
- fp_mul_2d (y, norm, y);
- } else {
- norm = 0;
- }
-
- /* note hac does 0 based, so if used==5 then its 0,1,2,3,4, e.g. use 4 */
- n = x->used - 1;
- t = y->used - 1;
-
- /* while (x >= y*b**n-t) do { q[n-t] += 1; x -= y*b**{n-t} } */
- fp_lshd (y, n - t); /* y = y*b**{n-t} */
-
- while (fp_cmp (x, y) != FP_LT) {
- ++(q->dp[n - t]);
- fp_sub (x, y, x);
- }
-
- /* reset y by shifting it back down */
- fp_rshd (y, n - t);
-
- /* step 3. for i from n down to (t + 1) */
- for (i = n; i >= (t + 1); i--) {
- if (i > x->used) {
- continue;
- }
-
- /* step 3.1 if xi == yt then set q{i-t-1} to b-1,
- * otherwise set q{i-t-1} to (xi*b + x{i-1})/yt */
- if (x->dp[i] == y->dp[t]) {
- q->dp[i - t - 1] = (fp_digit) ((((fp_word)1) << DIGIT_BIT) - 1);
- } else {
- fp_word tmp;
- tmp = ((fp_word) x->dp[i]) << ((fp_word) DIGIT_BIT);
- tmp |= ((fp_word) x->dp[i - 1]);
- tmp /= ((fp_word)y->dp[t]);
- q->dp[i - t - 1] = (fp_digit) (tmp);
- }
-
- /* while (q{i-t-1} * (yt * b + y{t-1})) >
- xi * b**2 + xi-1 * b + xi-2
-
- do q{i-t-1} -= 1;
- */
- q->dp[i - t - 1] = (q->dp[i - t - 1] + 1);
- do {
- q->dp[i - t - 1] = (q->dp[i - t - 1] - 1);
-
- /* find left hand */
- fp_zero (t1);
- t1->dp[0] = (t - 1 < 0) ? 0 : y->dp[t - 1];
- t1->dp[1] = y->dp[t];
- t1->used = 2;
- fp_mul_d (t1, q->dp[i - t - 1], t1);
-
- /* find right hand */
- t2->dp[0] = (i - 2 < 0) ? 0 : x->dp[i - 2];
- t2->dp[1] = (i - 1 < 0) ? 0 : x->dp[i - 1];
- t2->dp[2] = x->dp[i];
- t2->used = 3;
- } while (fp_cmp_mag(t1, t2) == FP_GT);
-
- /* step 3.3 x = x - q{i-t-1} * y * b**{i-t-1} */
- fp_mul_d (y, q->dp[i - t - 1], t1);
- fp_lshd (t1, i - t - 1);
- fp_sub (x, t1, x);
-
- /* if x < 0 then { x = x + y*b**{i-t-1}; q{i-t-1} -= 1; } */
- if (x->sign == FP_NEG) {
- fp_copy (y, t1);
- fp_lshd (t1, i - t - 1);
- fp_add (x, t1, x);
- q->dp[i - t - 1] = q->dp[i - t - 1] - 1;
- }
- }
-
- /* now q is the quotient and x is the remainder
- * [which we have to normalize]
- */
-
- /* get sign before writing to c */
- x->sign = x->used == 0 ? FP_ZPOS : a->sign;
-
- if (c != NULL) {
- fp_clamp (q);
- fp_copy (q, c);
- c->sign = neg;
- }
-
- if (d != NULL) {
- fp_div_2d (x, norm, x, NULL);
-
- /* zero any excess digits on the destination that we didn't write to */
- for (i = b->used; i < x->used; i++) {
- x->dp[i] = 0;
- }
- fp_clamp(x);
- fp_copy (x, d);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(q, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-/* b = a/2 */
-void fp_div_2(fp_int * a, fp_int * b)
-{
- int x, oldused;
-
- oldused = b->used;
- b->used = a->used;
- {
- fp_digit r, rr, *tmpa, *tmpb;
-
- /* source alias */
- tmpa = a->dp + b->used - 1;
-
- /* dest alias */
- tmpb = b->dp + b->used - 1;
-
- /* carry */
- r = 0;
- for (x = b->used - 1; x >= 0; x--) {
- /* get the carry for the next iteration */
- rr = *tmpa & 1;
-
- /* shift the current digit, add in carry and store */
- *tmpb-- = (*tmpa-- >> 1) | (r << (DIGIT_BIT - 1));
-
- /* forward carry to next iteration */
- r = rr;
- }
-
- /* zero any excess digits on the destination that we didn't write to */
- tmpb = b->dp + b->used;
- for (x = b->used; x < oldused; x++) {
- *tmpb++ = 0;
- }
- }
- b->sign = a->sign;
- fp_clamp (b);
-}
-
-/* c = a / 2**b */
-void fp_div_2d(fp_int *a, int b, fp_int *c, fp_int *d)
-{
- int D;
-
- /* if the shift count is <= 0 then we do no work */
- if (b <= 0) {
- fp_copy (a, c);
- if (d != NULL) {
- fp_zero (d);
- }
- return;
- }
-
- /* get the remainder before a is changed in calculating c */
- if (a == c && d != NULL) {
- fp_mod_2d (a, b, d);
- }
-
- /* copy */
- fp_copy(a, c);
-
- /* shift by as many digits in the bit count */
- if (b >= (int)DIGIT_BIT) {
- fp_rshd (c, b / DIGIT_BIT);
- }
-
- /* shift any bit count < DIGIT_BIT */
- D = (b % DIGIT_BIT);
- if (D != 0) {
- fp_rshb(c, D);
- }
-
- /* get the remainder if a is not changed in calculating c */
- if (a != c && d != NULL) {
- fp_mod_2d (a, b, d);
- }
-
- fp_clamp (c);
-}
-
-/* c = a mod b, 0 <= c < b */
-int fp_mod(fp_int *a, fp_int *b, fp_int *c)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
- int err;
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init(t);
- err = fp_div(a, b, NULL, t);
- if (err == FP_OKAY) {
- if (t->sign != b->sign) {
- fp_add(t, b, c);
- } else {
- fp_copy(t, c);
- }
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-/* c = a mod 2**d */
-void fp_mod_2d(fp_int *a, int b, fp_int *c)
-{
- int x;
-
- /* zero if count less than or equal to zero */
- if (b <= 0) {
- fp_zero(c);
- return;
- }
-
- /* get copy of input */
- fp_copy(a, c);
-
- /* if 2**d is larger than we just return */
- if (b >= (DIGIT_BIT * a->used)) {
- return;
- }
-
- /* zero digits above the last digit of the modulus */
- for (x = (b / DIGIT_BIT) + ((b % DIGIT_BIT) == 0 ? 0 : 1); x < c->used; x++) {
- c->dp[x] = 0;
- }
- /* clear the digit that is not completely outside/inside the modulus */
- c->dp[b / DIGIT_BIT] &= ~((fp_digit)0) >> (DIGIT_BIT - b);
- fp_clamp (c);
-}
-
-static int fp_invmod_slow (fp_int * a, fp_int * b, fp_int * c)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int x[1], y[1], u[1], v[1], A[1], B[1], C[1], D[1];
-#else
- fp_int *x, *y, *u, *v, *A, *B, *C, *D;
-#endif
- int err;
-
- /* b cannot be negative */
- if (b->sign == FP_NEG || fp_iszero(b) == FP_YES) {
- return FP_VAL;
- }
- if (fp_iszero(a) == FP_YES) {
- return FP_VAL;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- x = (fp_int*)XMALLOC(sizeof(fp_int) * 8, NULL, DYNAMIC_TYPE_BIGINT);
- if (x == NULL) {
- return FP_MEM;
- }
- y = &x[1]; u = &x[2]; v = &x[3]; A = &x[4]; B = &x[5]; C = &x[6]; D = &x[7];
-#endif
-
- /* init temps */
- fp_init(x); fp_init(y);
- fp_init(u); fp_init(v);
- fp_init(A); fp_init(B);
- fp_init(C); fp_init(D);
-
- /* x = a, y = b */
- if ((err = fp_mod(a, b, x)) != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
- fp_copy(b, y);
-
- /* 2. [modified] if x,y are both even then return an error! */
- if (fp_iseven(x) == FP_YES && fp_iseven(y) == FP_YES) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return FP_VAL;
- }
-
- /* 3. u=x, v=y, A=1, B=0, C=0,D=1 */
- fp_copy (x, u);
- fp_copy (y, v);
- fp_set (A, 1);
- fp_set (D, 1);
-
-top:
- /* 4. while u is even do */
- while (fp_iseven (u) == FP_YES) {
- /* 4.1 u = u/2 */
- fp_div_2 (u, u);
-
- /* 4.2 if A or B is odd then */
- if (fp_isodd (A) == FP_YES || fp_isodd (B) == FP_YES) {
- /* A = (A+y)/2, B = (B-x)/2 */
- fp_add (A, y, A);
- fp_sub (B, x, B);
- }
- /* A = A/2, B = B/2 */
- fp_div_2 (A, A);
- fp_div_2 (B, B);
- }
-
- /* 5. while v is even do */
- while (fp_iseven (v) == FP_YES) {
- /* 5.1 v = v/2 */
- fp_div_2 (v, v);
-
- /* 5.2 if C or D is odd then */
- if (fp_isodd (C) == FP_YES || fp_isodd (D) == FP_YES) {
- /* C = (C+y)/2, D = (D-x)/2 */
- fp_add (C, y, C);
- fp_sub (D, x, D);
- }
- /* C = C/2, D = D/2 */
- fp_div_2 (C, C);
- fp_div_2 (D, D);
- }
-
- /* 6. if u >= v then */
- if (fp_cmp (u, v) != FP_LT) {
- /* u = u - v, A = A - C, B = B - D */
- fp_sub (u, v, u);
- fp_sub (A, C, A);
- fp_sub (B, D, B);
- } else {
- /* v - v - u, C = C - A, D = D - B */
- fp_sub (v, u, v);
- fp_sub (C, A, C);
- fp_sub (D, B, D);
- }
-
- /* if not zero goto step 4 */
- if (fp_iszero (u) == FP_NO)
- goto top;
-
- /* now a = C, b = D, gcd == g*v */
-
- /* if v != 1 then there is no inverse */
- if (fp_cmp_d (v, 1) != FP_EQ) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return FP_VAL;
- }
-
- /* if its too low */
- while (fp_cmp_d(C, 0) == FP_LT) {
- fp_add(C, b, C);
- }
-
- /* too big */
- while (fp_cmp_mag(C, b) != FP_LT) {
- fp_sub(C, b, C);
- }
-
- /* C is now the inverse */
- fp_copy(C, c);
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-/* c = 1/a (mod b) for odd b only */
-int fp_invmod(fp_int *a, fp_int *b, fp_int *c)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int x[1], y[1], u[1], v[1], B[1], D[1];
-#else
- fp_int *x, *y, *u, *v, *B, *D;
-#endif
- int neg;
- int err;
-
- if (b->sign == FP_NEG || fp_iszero(b) == FP_YES) {
- return FP_VAL;
- }
-
- /* [modified] sanity check on "a" */
- if (fp_iszero(a) == FP_YES) {
- return FP_VAL; /* can not divide by 0 here */
- }
-
- /* 2. [modified] b must be odd */
- if (fp_iseven(b) == FP_YES) {
- return fp_invmod_slow(a,b,c);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- x = (fp_int*)XMALLOC(sizeof(fp_int) * 6, NULL, DYNAMIC_TYPE_BIGINT);
- if (x == NULL) {
- return FP_MEM;
- }
- y = &x[1]; u = &x[2]; v = &x[3]; B = &x[4]; D = &x[5];
-#endif
-
- /* init all our temps */
- fp_init(x); fp_init(y);
- fp_init(u); fp_init(v);
- fp_init(B); fp_init(D);
-
- if (fp_cmp(a, b) != MP_LT) {
- err = mp_mod(a, b, y);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
- a = y;
- }
-
- if (fp_iszero(a) == FP_YES) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return FP_VAL;
- }
-
- /* x == modulus, y == value to invert */
- fp_copy(b, x);
-
- /* we need y = |a| */
- fp_abs(a, y);
-
- /* 3. u=x, v=y, A=1, B=0, C=0,D=1 */
- fp_copy(x, u);
- fp_copy(y, v);
- fp_set (D, 1);
-
-top:
- /* 4. while u is even do */
- while (fp_iseven (u) == FP_YES) {
- /* 4.1 u = u/2 */
- fp_div_2 (u, u);
-
- /* 4.2 if B is odd then */
- if (fp_isodd (B) == FP_YES) {
- fp_sub (B, x, B);
- }
- /* B = B/2 */
- fp_div_2 (B, B);
- }
-
- /* 5. while v is even do */
- while (fp_iseven (v) == FP_YES) {
- /* 5.1 v = v/2 */
- fp_div_2 (v, v);
-
- /* 5.2 if D is odd then */
- if (fp_isodd (D) == FP_YES) {
- /* D = (D-x)/2 */
- fp_sub (D, x, D);
- }
- /* D = D/2 */
- fp_div_2 (D, D);
- }
-
- /* 6. if u >= v then */
- if (fp_cmp (u, v) != FP_LT) {
- /* u = u - v, B = B - D */
- fp_sub (u, v, u);
- fp_sub (B, D, B);
- } else {
- /* v - v - u, D = D - B */
- fp_sub (v, u, v);
- fp_sub (D, B, D);
- }
-
- /* if not zero goto step 4 */
- if (fp_iszero (u) == FP_NO) {
- goto top;
- }
-
- /* now a = C, b = D, gcd == g*v */
-
- /* if v != 1 then there is no inverse */
- if (fp_cmp_d (v, 1) != FP_EQ) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return FP_VAL;
- }
-
- /* b is now the inverse */
- neg = a->sign;
- while (D->sign == FP_NEG) {
- fp_add (D, b, D);
- }
- /* too big */
- while (fp_cmp_mag(D, b) != FP_LT) {
- fp_sub(D, b, D);
- }
- fp_copy (D, c);
- c->sign = neg;
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(x, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-#define CT_INV_MOD_PRE_CNT 8
-
-/* modulus (b) must be greater than 2 and a prime */
-int fp_invmod_mont_ct(fp_int *a, fp_int *b, fp_int *c, fp_digit mp)
-{
- int i, j;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1], e[1];
- fp_int pre[CT_INV_MOD_PRE_CNT];
-#else
- fp_int* t;
- fp_int* e;
- fp_int* pre;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int) * (2 + CT_INV_MOD_PRE_CNT), NULL,
- DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
- e = t + 1;
- pre = t + 2;
-#endif
-
- fp_init(t);
- fp_init(e);
-
- fp_init(&pre[0]);
- fp_copy(a, &pre[0]);
- for (i = 1; i < CT_INV_MOD_PRE_CNT; i++) {
- fp_init(&pre[i]);
- fp_sqr(&pre[i-1], &pre[i]);
- fp_montgomery_reduce(&pre[i], b, mp);
- fp_mul(&pre[i], a, &pre[i]);
- fp_montgomery_reduce(&pre[i], b, mp);
- }
-
- fp_sub_d(b, 2, e);
- /* Highest bit is always set. */
- for (i = fp_count_bits(e)-2, j = 1; i >= 0; i--, j++) {
- if (!fp_is_bit_set(e, i) || j == CT_INV_MOD_PRE_CNT)
- break;
- }
- fp_copy(&pre[j-1], t);
- for (j = 0; i >= 0; i--) {
- int set = fp_is_bit_set(e, i);
-
- if ((j == CT_INV_MOD_PRE_CNT) || (!set && j > 0)) {
- fp_mul(t, &pre[j-1], t);
- fp_montgomery_reduce(t, b, mp);
- j = 0;
- }
- fp_sqr(t, t);
- fp_montgomery_reduce(t, b, mp);
- j += set;
- }
- if (j > 0) {
- fp_mul(t, &pre[j-1], c);
- fp_montgomery_reduce(c, b, mp);
- }
- else
- fp_copy(t, c);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-/* d = a * b (mod c) */
-int fp_mulmod(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
-{
- int err;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init(t);
- err = fp_mul(a, b, t);
- if (err == FP_OKAY) {
- #if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- if (d->size < FP_SIZE) {
- err = fp_mod(t, c, t);
- fp_copy(t, d);
- } else
- #endif
- {
- err = fp_mod(t, c, d);
- }
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-/* d = a - b (mod c) */
-int fp_submod(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
-{
- int err;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init(t);
- fp_sub(a, b, t);
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- if (d->size < FP_SIZE) {
- err = fp_mod(t, c, t);
- fp_copy(t, d);
- } else
-#endif
- {
- err = fp_mod(t, c, d);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-/* d = a + b (mod c) */
-int fp_addmod(fp_int *a, fp_int *b, fp_int *c, fp_int *d)
-{
- int err;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init(t);
- fp_add(a, b, t);
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- if (d->size < FP_SIZE) {
- err = fp_mod(t, c, t);
- fp_copy(t, d);
- } else
-#endif
- {
- err = fp_mod(t, c, d);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-#ifdef TFM_TIMING_RESISTANT
-
-#ifdef WC_RSA_NONBLOCK
-
-#ifdef WC_RSA_NONBLOCK_TIME
- /* User can override the check-time at build-time using the
- * FP_EXPTMOD_NB_CHECKTIME macro to define your own function */
- #ifndef FP_EXPTMOD_NB_CHECKTIME
- /* instruction count for each type of operation */
- /* array lookup is using TFM_EXPTMOD_NB_* states */
- static const word32 exptModNbInst[TFM_EXPTMOD_NB_COUNT] = {
- #ifdef TFM_PPC32
- #ifdef _DEBUG
- 11098, 8701, 3971, 178394, 858093, 1040, 822, 178056, 181574, 90883, 184339, 236813
- #else
- 7050, 2554, 3187, 43178, 200422, 384, 275, 43024, 43550, 30450, 46270, 61376
- #endif
- #elif defined(TFM_X86_64)
- #ifdef _DEBUG
- 954, 2377, 858, 19027, 90840, 287, 407, 20140, 7874, 11385, 8005, 6151
- #else
- 765, 1007, 771, 5216, 34993, 248, 193, 4975, 4201, 3947, 4275, 3811
- #endif
- #else /* software only fast math */
- #ifdef _DEBUG
- 798, 2245, 802, 16657, 66920, 352, 186, 16997, 16145, 12789, 16742, 15006
- #else
- 775, 1084, 783, 4692, 37510, 207, 183, 4374, 4392, 3097, 4442, 4079
- #endif
- #endif
- };
-
- static int fp_exptmod_nb_checktime(exptModNb_t* nb)
- {
- word32 totalInst;
-
- /* if no max time has been set then stop (do not block) */
- if (nb->maxBlockInst == 0 || nb->state >= TFM_EXPTMOD_NB_COUNT) {
- return TFM_EXPTMOD_NB_STOP;
- }
-
- /* if instruction table not set then use maxBlockInst as simple counter */
- if (exptModNbInst[nb->state] == 0) {
- if (++nb->totalInst < nb->maxBlockInst)
- return TFM_EXPTMOD_NB_CONTINUE;
-
- nb->totalInst = 0; /* reset counter */
- return TFM_EXPTMOD_NB_STOP;
- }
-
- /* get total instruction count including next operation */
- totalInst = nb->totalInst + exptModNbInst[nb->state];
- /* if the next operation can completed within the maximum then continue */
- if (totalInst <= nb->maxBlockInst) {
- return TFM_EXPTMOD_NB_CONTINUE;
- }
-
- return TFM_EXPTMOD_NB_STOP;
- }
- #define FP_EXPTMOD_NB_CHECKTIME(nb) fp_exptmod_nb_checktime((nb))
- #endif /* !FP_EXPTMOD_NB_CHECKTIME */
-#endif /* WC_RSA_NONBLOCK_TIME */
-
-/* non-blocking version of timing resistant fp_exptmod function */
-/* supports cache resistance */
-int fp_exptmod_nb(exptModNb_t* nb, fp_int* G, fp_int* X, fp_int* P, fp_int* Y)
-{
- int err, ret = FP_WOULDBLOCK;
-
- if (nb == NULL)
- return FP_VAL;
-
-#ifdef WC_RSA_NONBLOCK_TIME
- nb->totalInst = 0;
- do {
- nb->totalInst += exptModNbInst[nb->state];
-#endif
-
- switch (nb->state) {
- case TFM_EXPTMOD_NB_INIT:
- /* now setup montgomery */
- if ((err = fp_montgomery_setup(P, &nb->mp)) != FP_OKAY) {
- nb->state = TFM_EXPTMOD_NB_INIT;
- return err;
- }
-
- /* init ints */
- fp_init(&nb->R[0]);
- fp_init(&nb->R[1]);
- #ifndef WC_NO_CACHE_RESISTANT
- fp_init(&nb->R[2]);
- #endif
- nb->state = TFM_EXPTMOD_NB_MONT;
- break;
-
- case TFM_EXPTMOD_NB_MONT:
- /* mod m -> R[0] */
- fp_montgomery_calc_normalization(&nb->R[0], P);
-
- nb->state = TFM_EXPTMOD_NB_MONT_RED;
- break;
-
- case TFM_EXPTMOD_NB_MONT_RED:
- /* reduce G -> R[1] */
- if (fp_cmp_mag(P, G) != FP_GT) {
- /* G > P so we reduce it first */
- fp_mod(G, P, &nb->R[1]);
- } else {
- fp_copy(G, &nb->R[1]);
- }
-
- nb->state = TFM_EXPTMOD_NB_MONT_MUL;
- break;
-
- case TFM_EXPTMOD_NB_MONT_MUL:
- /* G (R[1]) * m (R[0]) */
- err = fp_mul(&nb->R[1], &nb->R[0], &nb->R[1]);
- if (err != FP_OKAY) {
- nb->state = TFM_EXPTMOD_NB_INIT;
- return err;
- }
-
- nb->state = TFM_EXPTMOD_NB_MONT_MOD;
- break;
-
- case TFM_EXPTMOD_NB_MONT_MOD:
- /* mod m */
- err = fp_div(&nb->R[1], P, NULL, &nb->R[1]);
- if (err != FP_OKAY) {
- nb->state = TFM_EXPTMOD_NB_INIT;
- return err;
- }
-
- nb->state = TFM_EXPTMOD_NB_MONT_MODCHK;
- break;
-
- case TFM_EXPTMOD_NB_MONT_MODCHK:
- /* m matches sign of (G * R mod m) */
- if (nb->R[1].sign != P->sign) {
- fp_add(&nb->R[1], P, &nb->R[1]);
- }
-
- /* set initial mode and bit cnt */
- nb->bitcnt = 1;
- nb->buf = 0;
- nb->digidx = X->used - 1;
-
- nb->state = TFM_EXPTMOD_NB_NEXT;
- break;
-
- case TFM_EXPTMOD_NB_NEXT:
- /* grab next digit as required */
- if (--nb->bitcnt == 0) {
- /* if nb->digidx == -1 we are out of digits so break */
- if (nb->digidx == -1) {
- nb->state = TFM_EXPTMOD_NB_RED;
- break;
- }
- /* read next digit and reset nb->bitcnt */
- nb->buf = X->dp[nb->digidx--];
- nb->bitcnt = (int)DIGIT_BIT;
- }
-
- /* grab the next msb from the exponent */
- nb->y = (int)(nb->buf >> (DIGIT_BIT - 1)) & 1;
- nb->buf <<= (fp_digit)1;
- nb->state = TFM_EXPTMOD_NB_MUL;
- FALL_THROUGH;
-
- case TFM_EXPTMOD_NB_MUL:
- fp_mul(&nb->R[0], &nb->R[1], &nb->R[nb->y^1]);
- nb->state = TFM_EXPTMOD_NB_MUL_RED;
- break;
-
- case TFM_EXPTMOD_NB_MUL_RED:
- fp_montgomery_reduce(&nb->R[nb->y^1], P, nb->mp);
- nb->state = TFM_EXPTMOD_NB_SQR;
- break;
-
- case TFM_EXPTMOD_NB_SQR:
- #ifdef WC_NO_CACHE_RESISTANT
- fp_sqr(&nb->R[nb->y], &nb->R[nb->y]);
- #else
- fp_copy((fp_int*) ( ((wolfssl_word)&nb->R[0] & wc_off_on_addr[nb->y^1]) +
- ((wolfssl_word)&nb->R[1] & wc_off_on_addr[nb->y]) ),
- &nb->R[2]);
- fp_sqr(&nb->R[2], &nb->R[2]);
- #endif /* WC_NO_CACHE_RESISTANT */
-
- nb->state = TFM_EXPTMOD_NB_SQR_RED;
- break;
-
- case TFM_EXPTMOD_NB_SQR_RED:
- #ifdef WC_NO_CACHE_RESISTANT
- fp_montgomery_reduce(&nb->R[nb->y], P, nb->mp);
- #else
- fp_montgomery_reduce(&nb->R[2], P, nb->mp);
- fp_copy(&nb->R[2],
- (fp_int*) ( ((wolfssl_word)&nb->R[0] & wc_off_on_addr[nb->y^1]) +
- ((wolfssl_word)&nb->R[1] & wc_off_on_addr[nb->y]) ) );
- #endif /* WC_NO_CACHE_RESISTANT */
-
- nb->state = TFM_EXPTMOD_NB_NEXT;
- break;
-
- case TFM_EXPTMOD_NB_RED:
- /* final reduce */
- fp_montgomery_reduce(&nb->R[0], P, nb->mp);
- fp_copy(&nb->R[0], Y);
-
- nb->state = TFM_EXPTMOD_NB_INIT;
- ret = FP_OKAY;
- break;
- } /* switch */
-
-#ifdef WC_RSA_NONBLOCK_TIME
- /* determine if maximum blocking time has been reached */
- } while (ret == FP_WOULDBLOCK &&
- FP_EXPTMOD_NB_CHECKTIME(nb) == TFM_EXPTMOD_NB_CONTINUE);
-#endif
-
- return ret;
-}
-
-#endif /* WC_RSA_NONBLOCK */
-
-
-/* timing resistant montgomery ladder based exptmod
- Based on work by Marc Joye, Sung-Ming Yen, "The Montgomery Powering Ladder",
- Cryptographic Hardware and Embedded Systems, CHES 2002
-*/
-static int _fp_exptmod_ct(fp_int * G, fp_int * X, int digits, fp_int * P,
- fp_int * Y)
-{
-#ifndef WOLFSSL_SMALL_STACK
-#ifdef WC_NO_CACHE_RESISTANT
- fp_int R[2];
-#else
- fp_int R[3]; /* need a temp for cache resistance */
-#endif
-#else
- fp_int *R;
-#endif
- fp_digit buf, mp;
- int err, bitcnt, digidx, y;
-
- /* now setup montgomery */
- if ((err = fp_montgomery_setup (P, &mp)) != FP_OKAY) {
- return err;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
-#ifndef WC_NO_CACHE_RESISTANT
- R = (fp_int*)XMALLOC(sizeof(fp_int) * 3, NULL, DYNAMIC_TYPE_BIGINT);
-#else
- R = (fp_int*)XMALLOC(sizeof(fp_int) * 2, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- if (R == NULL)
- return FP_MEM;
-#endif
- fp_init(&R[0]);
- fp_init(&R[1]);
-#ifndef WC_NO_CACHE_RESISTANT
- fp_init(&R[2]);
-#endif
-
- /* now we need R mod m */
- fp_montgomery_calc_normalization (&R[0], P);
-
- /* now set R[0][1] to G * R mod m */
- if (fp_cmp_mag(P, G) != FP_GT) {
- /* G > P so we reduce it first */
- fp_mod(G, P, &R[1]);
- } else {
- fp_copy(G, &R[1]);
- }
- fp_mulmod (&R[1], &R[0], P, &R[1]);
-
- /* for j = t-1 downto 0 do
- r_!k = R0*R1; r_k = r_k^2
- */
-
- /* set initial mode and bit cnt */
- bitcnt = 1;
- buf = 0;
- digidx = digits - 1;
-
- for (;;) {
- /* grab next digit as required */
- if (--bitcnt == 0) {
- /* if digidx == -1 we are out of digits so break */
- if (digidx == -1) {
- break;
- }
- /* read next digit and reset bitcnt */
- buf = X->dp[digidx--];
- bitcnt = (int)DIGIT_BIT;
- }
-
- /* grab the next msb from the exponent */
- y = (int)(buf >> (DIGIT_BIT - 1)) & 1;
- buf <<= (fp_digit)1;
-
- /* do ops */
- err = fp_mul(&R[0], &R[1], &R[y^1]);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
- err = fp_montgomery_reduce(&R[y^1], P, mp);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
-
-#ifdef WC_NO_CACHE_RESISTANT
- err = fp_sqr(&R[y], &R[y]);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
- err = fp_montgomery_reduce(&R[y], P, mp);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
-#else
- /* instead of using R[y] for sqr, which leaks key bit to cache monitor,
- * use R[2] as temp, make sure address calc is constant, keep
- * &R[0] and &R[1] in cache */
- fp_copy((fp_int*) ( ((wolfssl_word)&R[0] & wc_off_on_addr[y^1]) +
- ((wolfssl_word)&R[1] & wc_off_on_addr[y]) ),
- &R[2]);
- err = fp_sqr(&R[2], &R[2]);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
- err = fp_montgomery_reduce(&R[2], P, mp);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
- }
- fp_copy(&R[2],
- (fp_int*) ( ((wolfssl_word)&R[0] & wc_off_on_addr[y^1]) +
- ((wolfssl_word)&R[1] & wc_off_on_addr[y]) ) );
-#endif /* WC_NO_CACHE_RESISTANT */
- }
-
- err = fp_montgomery_reduce(&R[0], P, mp);
- fp_copy(&R[0], Y);
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(R, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-#endif /* TFM_TIMING_RESISTANT */
-
-/* y = g**x (mod b)
- * Some restrictions... x must be positive and < b
- */
-static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
-{
- fp_int *res;
- fp_int *M;
- fp_digit buf, mp;
- int err, bitbuf, bitcpy, bitcnt, mode, digidx, x, y, winsize;
-
- /* find window size */
- x = fp_count_bits (X);
- if (x <= 21) {
- winsize = 1;
- } else if (x <= 36) {
- winsize = 3;
- } else if (x <= 140) {
- winsize = 4;
- } else if (x <= 450) {
- winsize = 5;
- } else {
- winsize = 6;
- }
-
- /* now setup montgomery */
- if ((err = fp_montgomery_setup (P, &mp)) != FP_OKAY) {
- return err;
- }
-
- /* only allocate space for what's needed for window plus res */
- M = (fp_int*)XMALLOC(sizeof(fp_int)*((1 << winsize) + 1), NULL,
- DYNAMIC_TYPE_BIGINT);
- if (M == NULL) {
- return FP_MEM;
- }
- res = &M[1 << winsize];
-
- /* init M array */
- for(x = 0; x < (1 << winsize); x++)
- fp_init(&M[x]);
-
- /* setup result */
- fp_init(res);
-
- /* create M table
- *
- * The M table contains powers of the input base, e.g. M[x] = G^x mod P
- *
- * The first half of the table is not computed though except for M[0] and M[1]
- */
-
- /* now we need R mod m */
- fp_montgomery_calc_normalization (res, P);
-
- /* now set M[1] to G * R mod m */
- if (fp_cmp_mag(P, G) != FP_GT) {
- /* G > P so we reduce it first */
- fp_mod(G, P, &M[1]);
- } else {
- fp_copy(G, &M[1]);
- }
- fp_mulmod (&M[1], res, P, &M[1]);
-
- /* compute the value at M[1<<(winsize-1)] by
- * squaring M[1] (winsize-1) times */
- fp_copy (&M[1], &M[1 << (winsize - 1)]);
- for (x = 0; x < (winsize - 1); x++) {
- fp_sqr (&M[1 << (winsize - 1)], &M[1 << (winsize - 1)]);
- err = fp_montgomery_reduce (&M[1 << (winsize - 1)], P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- }
-
- /* create upper table */
- for (x = (1 << (winsize - 1)) + 1; x < (1 << winsize); x++) {
- err = fp_mul(&M[x - 1], &M[1], &M[x]);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- err = fp_montgomery_reduce(&M[x], P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- }
-
- /* set initial mode and bit cnt */
- mode = 0;
- bitcnt = (x % DIGIT_BIT) + 1;
- buf = 0;
- digidx = X->used - 1;
- bitcpy = 0;
- bitbuf = 0;
-
- for (;;) {
- /* grab next digit as required */
- if (--bitcnt == 0) {
- /* if digidx == -1 we are out of digits so break */
- if (digidx == -1) {
- break;
- }
- /* read next digit and reset bitcnt */
- buf = X->dp[digidx--];
- bitcnt = (int)DIGIT_BIT;
- }
-
- /* grab the next msb from the exponent */
- y = (int)(buf >> (DIGIT_BIT - 1)) & 1;
- buf <<= (fp_digit)1;
-
- /* if the bit is zero and mode == 0 then we ignore it
- * These represent the leading zero bits before the first 1 bit
- * in the exponent. Technically this opt is not required but it
- * does lower the # of trivial squaring/reductions used
- */
- if (mode == 0 && y == 0) {
- continue;
- }
-
- /* if the bit is zero and mode == 1 then we square */
- if (mode == 1 && y == 0) {
- err = fp_sqr(res, res);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- continue;
- }
-
- /* else we add it to the window */
- bitbuf |= (y << (winsize - ++bitcpy));
- mode = 2;
-
- if (bitcpy == winsize) {
- /* ok window is filled so square as required and multiply */
- /* square first */
- for (x = 0; x < winsize; x++) {
- err = fp_sqr(res, res);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- err = fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- }
-
- /* then multiply */
- err = fp_mul(res, &M[bitbuf], res);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- err = fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
-
- /* empty window and reset */
- bitcpy = 0;
- bitbuf = 0;
- mode = 1;
- }
- }
-
- /* if bits remain then square/multiply */
- if (mode == 2 && bitcpy > 0) {
- /* square then multiply if the bit is set */
- for (x = 0; x < bitcpy; x++) {
- err = fp_sqr(res, res);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- err = fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
-
- /* get next bit of the window */
- bitbuf <<= 1;
- if ((bitbuf & (1 << winsize)) != 0) {
- /* then multiply */
- err = fp_mul(res, &M[1], res);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- err = fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
- }
- }
- }
- }
-
- /* fixup result if Montgomery reduction is used
- * recall that any value in a Montgomery system is
- * actually multiplied by R mod n. So we have
- * to reduce one more time to cancel out the factor
- * of R.
- */
- err = fp_montgomery_reduce(res, P, mp);
-
- /* swap res with Y */
- fp_copy (res, Y);
-
- XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
- return err;
-}
-
-
-#ifdef TFM_TIMING_RESISTANT
-#if DIGIT_BIT <= 16
- #define WINSIZE 2
-#elif DIGIT_BIT <= 32
- #define WINSIZE 3
-#elif DIGIT_BIT <= 64
- #define WINSIZE 4
-#elif DIGIT_BIT <= 128
- #define WINSIZE 5
-#endif
-
-/* y = 2**x (mod b)
- * Some restrictions... x must be positive and < b
- */
-static int _fp_exptmod_base_2(fp_int * X, int digits, fp_int * P,
- fp_int * Y)
-{
- fp_digit buf, mp;
- int err, bitbuf, bitcpy, bitcnt, digidx, x, y;
-#ifdef WOLFSSL_SMALL_STACK
- fp_int *res;
- fp_int *tmp;
-#else
- fp_int res[1];
- fp_int tmp[1];
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- res = (fp_int*)XMALLOC(2*sizeof(fp_int), NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (res == NULL) {
- return FP_MEM;
- }
- tmp = &res[1];
-#endif
-
- /* now setup montgomery */
- if ((err = fp_montgomery_setup(P, &mp)) != FP_OKAY) {
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-#endif
- return err;
- }
-
- /* setup result */
- fp_init(res);
- fp_init(tmp);
-
- fp_mul_2d(P, 1 << WINSIZE, tmp);
-
- /* now we need R mod m */
- fp_montgomery_calc_normalization(res, P);
-
- /* Get the top bits left over after taking WINSIZE bits starting at the
- * least-significant.
- */
- digidx = digits - 1;
- bitcpy = (digits * DIGIT_BIT) % WINSIZE;
- if (bitcpy > 0) {
- bitcnt = (int)DIGIT_BIT - bitcpy;
- buf = X->dp[digidx--];
- bitbuf = (int)(buf >> bitcnt);
- /* Multiply montgomery representation of 1 by 2 ^ top */
- fp_mul_2d(res, bitbuf, res);
- fp_add(res, tmp, res);
- err = fp_mod(res, P, res);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- /* Move out bits used */
- buf <<= bitcpy;
- bitcnt++;
- }
- else {
- bitcnt = 1;
- buf = 0;
- }
-
- /* empty window and reset */
- bitbuf = 0;
- bitcpy = 0;
-
- for (;;) {
- /* grab next digit as required */
- if (--bitcnt == 0) {
- /* if digidx == -1 we are out of digits so break */
- if (digidx == -1) {
- break;
- }
- /* read next digit and reset bitcnt */
- buf = X->dp[digidx--];
- bitcnt = (int)DIGIT_BIT;
- }
-
- /* grab the next msb from the exponent */
- y = (int)(buf >> (DIGIT_BIT - 1)) & 1;
- buf <<= (fp_digit)1;
- /* add bit to the window */
- bitbuf |= (y << (WINSIZE - ++bitcpy));
-
- if (bitcpy == WINSIZE) {
- /* ok window is filled so square as required and multiply */
- /* square first */
- for (x = 0; x < WINSIZE; x++) {
- err = fp_sqr(res, res);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- err = fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- }
-
- /* then multiply by 2^bitbuf */
- fp_mul_2d(res, bitbuf, res);
- /* Add in value to make mod operation take same time */
- fp_add(res, tmp, res);
- err = fp_mod(res, P, res);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
-
- /* empty window and reset */
- bitcpy = 0;
- bitbuf = 0;
- }
- }
-
- /* fixup result if Montgomery reduction is used
- * recall that any value in a Montgomery system is
- * actually multiplied by R mod n. So we have
- * to reduce one more time to cancel out the factor
- * of R.
- */
- err = fp_montgomery_reduce(res, P, mp);
-
- /* swap res with Y */
- fp_copy(res, Y);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-#endif
- return err;
-}
-
-#undef WINSIZE
-#else
-#if DIGIT_BIT < 16
- #define WINSIZE 3
-#elif DIGIT_BIT < 32
- #define WINSIZE 4
-#elif DIGIT_BIT < 64
- #define WINSIZE 5
-#elif DIGIT_BIT < 128
- #define WINSIZE 6
-#elif DIGIT_BIT == 128
- #define WINSIZE 7
-#endif
-
-/* y = 2**x (mod b)
- * Some restrictions... x must be positive and < b
- */
-static int _fp_exptmod_base_2(fp_int * X, int digits, fp_int * P,
- fp_int * Y)
-{
- fp_digit buf, mp;
- int err, bitbuf, bitcpy, bitcnt, digidx, x, y;
-#ifdef WOLFSSL_SMALL_STACK
- fp_int *res;
-#else
- fp_int res[1];
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- res = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (res == NULL) {
- return FP_MEM;
- }
-#endif
-
- /* now setup montgomery */
- if ((err = fp_montgomery_setup(P, &mp)) != FP_OKAY) {
- return err;
- }
-
- /* setup result */
- fp_init(res);
-
- /* now we need R mod m */
- fp_montgomery_calc_normalization(res, P);
-
- /* Get the top bits left over after taking WINSIZE bits starting at the
- * least-significant.
- */
- digidx = digits - 1;
- bitcpy = (digits * DIGIT_BIT) % WINSIZE;
- if (bitcpy > 0) {
- bitcnt = (int)DIGIT_BIT - bitcpy;
- buf = X->dp[digidx--];
- bitbuf = (int)(buf >> bitcnt);
- /* Multiply montgomery representation of 1 by 2 ^ top */
- fp_mul_2d(res, bitbuf, res);
- err = fp_mod(res, P, res);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- /* Move out bits used */
- buf <<= bitcpy;
- bitcnt++;
- }
- else {
- bitcnt = 1;
- buf = 0;
- }
-
- /* empty window and reset */
- bitbuf = 0;
- bitcpy = 0;
-
- for (;;) {
- /* grab next digit as required */
- if (--bitcnt == 0) {
- /* if digidx == -1 we are out of digits so break */
- if (digidx == -1) {
- break;
- }
- /* read next digit and reset bitcnt */
- buf = X->dp[digidx--];
- bitcnt = (int)DIGIT_BIT;
- }
-
- /* grab the next msb from the exponent */
- y = (int)(buf >> (DIGIT_BIT - 1)) & 1;
- buf <<= (fp_digit)1;
- /* add bit to the window */
- bitbuf |= (y << (WINSIZE - ++bitcpy));
-
- if (bitcpy == WINSIZE) {
- /* ok window is filled so square as required and multiply */
- /* square first */
- for (x = 0; x < WINSIZE; x++) {
- err = fp_sqr(res, res);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- err = fp_montgomery_reduce(res, P, mp);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- }
-
- /* then multiply by 2^bitbuf */
- fp_mul_2d(res, bitbuf, res);
- err = fp_mod(res, P, res);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
-
- /* empty window and reset */
- bitcpy = 0;
- bitbuf = 0;
- }
- }
-
- /* fixup result if Montgomery reduction is used
- * recall that any value in a Montgomery system is
- * actually multiplied by R mod n. So we have
- * to reduce one more time to cancel out the factor
- * of R.
- */
- err = fp_montgomery_reduce(res, P, mp);
-
- /* swap res with Y */
- fp_copy(res, Y);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(res, NULL, DYNAMIC_TYPE_TMP_BUFFER);
-#endif
- return err;
-}
-
-#undef WINSIZE
-#endif
-
-
-int fp_exptmod(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
-{
-
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- int x = fp_count_bits (X);
-#endif
-
- /* handle modulus of zero and prevent overflows */
- if (fp_iszero(P) || (P->used > (FP_SIZE/2))) {
- return FP_VAL;
- }
- if (fp_isone(P)) {
- fp_set(Y, 0);
- return FP_OKAY;
- }
- if (fp_iszero(X)) {
- fp_set(Y, 1);
- return FP_OKAY;
- }
- if (fp_iszero(G)) {
- fp_set(Y, 0);
- return FP_OKAY;
- }
-
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- if(x > EPS_RSA_EXPT_XBTIS) {
- return esp_mp_exptmod(G, X, x, P, Y);
- }
-#endif
-
- if (X->sign == FP_NEG) {
-#ifndef POSITIVE_EXP_ONLY /* reduce stack if assume no negatives */
- int err;
- #ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[2];
- #else
- fp_int *tmp;
- #endif
-
- #ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int) * 2, NULL, DYNAMIC_TYPE_BIGINT);
- if (tmp == NULL)
- return FP_MEM;
- #endif
-
- /* yes, copy G and invmod it */
- fp_init_copy(&tmp[0], G);
- fp_init_copy(&tmp[1], P);
- tmp[1].sign = FP_ZPOS;
- err = fp_invmod(&tmp[0], &tmp[1], &tmp[0]);
- if (err == FP_OKAY) {
- fp_copy(X, &tmp[1]);
- tmp[1].sign = FP_ZPOS;
-#ifdef TFM_TIMING_RESISTANT
- err = _fp_exptmod_ct(&tmp[0], &tmp[1], tmp[1].used, P, Y);
-#else
- err = _fp_exptmod_nct(&tmp[0], &tmp[1], P, Y);
-#endif
- if (P->sign == FP_NEG) {
- fp_add(Y, P, Y);
- }
- }
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
-#else
- return FP_VAL;
-#endif
- }
- else if (G->used == 1 && G->dp[0] == 2) {
- return _fp_exptmod_base_2(X, X->used, P, Y);
- }
- else {
- /* Positive exponent so just exptmod */
-#ifdef TFM_TIMING_RESISTANT
- return _fp_exptmod_ct(G, X, X->used, P, Y);
-#else
- return _fp_exptmod_nct(G, X, P, Y);
-#endif
- }
-}
-
-int fp_exptmod_ex(fp_int * G, fp_int * X, int digits, fp_int * P, fp_int * Y)
-{
-
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- int x = fp_count_bits (X);
-#endif
-
- if (fp_iszero(G)) {
- fp_set(G, 0);
- return FP_OKAY;
- }
-
- /* prevent overflows */
- if (P->used > (FP_SIZE/2)) {
- return FP_VAL;
- }
-
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- if(x > EPS_RSA_EXPT_XBTIS) {
- return esp_mp_exptmod(G, X, x, P, Y);
- }
-#endif
-
- if (X->sign == FP_NEG) {
-#ifndef POSITIVE_EXP_ONLY /* reduce stack if assume no negatives */
- int err;
- #ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[2];
- #else
- fp_int *tmp;
- #endif
-
- #ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int) * 2, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (tmp == NULL)
- return FP_MEM;
- #endif
-
- /* yes, copy G and invmod it */
- fp_init_copy(&tmp[0], G);
- fp_init_copy(&tmp[1], P);
- tmp[1].sign = FP_ZPOS;
- err = fp_invmod(&tmp[0], &tmp[1], &tmp[0]);
- if (err == FP_OKAY) {
- X->sign = FP_ZPOS;
-#ifdef TFM_TIMING_RESISTANT
- err = _fp_exptmod_ct(&tmp[0], X, digits, P, Y);
-#else
- err = _fp_exptmod_nct(&tmp[0], X, P, Y);
- (void)digits;
-#endif
- if (X != Y) {
- X->sign = FP_NEG;
- }
- if (P->sign == FP_NEG) {
- fp_add(Y, P, Y);
- }
- }
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
-#else
- return FP_VAL;
-#endif
- }
- else {
- /* Positive exponent so just exptmod */
-#ifdef TFM_TIMING_RESISTANT
- return _fp_exptmod_ct(G, X, digits, P, Y);
-#else
- return _fp_exptmod_nct(G, X, P, Y);
-#endif
- }
-}
-
-int fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
-{
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- int x = fp_count_bits (X);
-#endif
-
- if (fp_iszero(G)) {
- fp_set(G, 0);
- return FP_OKAY;
- }
-
- /* prevent overflows */
- if (P->used > (FP_SIZE/2)) {
- return FP_VAL;
- }
-
-#if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- if(x > EPS_RSA_EXPT_XBTIS) {
- return esp_mp_exptmod(G, X, x, P, Y);
- }
-#endif
-
- if (X->sign == FP_NEG) {
-#ifndef POSITIVE_EXP_ONLY /* reduce stack if assume no negatives */
- int err;
- #ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[2];
- #else
- fp_int *tmp;
- #endif
-
- #ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int) * 2, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (tmp == NULL)
- return FP_MEM;
- #endif
-
- /* yes, copy G and invmod it */
- fp_init_copy(&tmp[0], G);
- fp_init_copy(&tmp[1], P);
- tmp[1].sign = FP_ZPOS;
- err = fp_invmod(&tmp[0], &tmp[1], &tmp[0]);
- if (err == FP_OKAY) {
- X->sign = FP_ZPOS;
- err = _fp_exptmod_nct(&tmp[0], X, P, Y);
- if (X != Y) {
- X->sign = FP_NEG;
- }
- if (P->sign == FP_NEG) {
- fp_add(Y, P, Y);
- }
- }
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return err;
-#else
- return FP_VAL;
-#endif
- }
- else {
- /* Positive exponent so just exptmod */
- return _fp_exptmod_nct(G, X, P, Y);
- }
-}
-
-/* computes a = 2**b */
-void fp_2expt(fp_int *a, int b)
-{
- int z;
-
- /* zero a as per default */
- fp_zero (a);
-
- if (b < 0) {
- return;
- }
-
- z = b / DIGIT_BIT;
- if (z >= FP_SIZE) {
- return;
- }
-
- /* set the used count of where the bit will go */
- a->used = z + 1;
-
- /* put the single bit in its place */
- a->dp[z] = ((fp_digit)1) << (b % DIGIT_BIT);
-}
-
-/* b = a*a */
-int fp_sqr(fp_int *A, fp_int *B)
-{
- int err;
- int y, oldused;
-
- oldused = B->used;
- y = A->used;
-
- /* call generic if we're out of range */
- if (y + y > FP_SIZE) {
- err = fp_sqr_comba(A, B);
- goto clean;
- }
-
-#if defined(TFM_SQR3) && FP_SIZE >= 6
- if (y <= 3) {
- err = fp_sqr_comba3(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR4) && FP_SIZE >= 8
- if (y == 4) {
- err = fp_sqr_comba4(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR6) && FP_SIZE >= 12
- if (y <= 6) {
- err = fp_sqr_comba6(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR7) && FP_SIZE >= 14
- if (y == 7) {
- err = fp_sqr_comba7(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR8) && FP_SIZE >= 16
- if (y == 8) {
- err = fp_sqr_comba8(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR9) && FP_SIZE >= 18
- if (y == 9) {
- err = fp_sqr_comba9(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR12) && FP_SIZE >= 24
- if (y <= 12) {
- err = fp_sqr_comba12(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR17) && FP_SIZE >= 34
- if (y <= 17) {
- err = fp_sqr_comba17(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SMALL_SET)
- if (y <= 16) {
- err = fp_sqr_comba_small(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR20) && FP_SIZE >= 40
- if (y <= 20) {
- err = fp_sqr_comba20(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR24) && FP_SIZE >= 48
- if (y <= 24) {
- err = fp_sqr_comba24(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR28) && FP_SIZE >= 56
- if (y <= 28) {
- err = fp_sqr_comba28(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR32) && FP_SIZE >= 64
- if (y <= 32) {
- err = fp_sqr_comba32(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR48) && FP_SIZE >= 96
- if (y <= 48) {
- err = fp_sqr_comba48(A,B);
- goto clean;
- }
-#endif
-#if defined(TFM_SQR64) && FP_SIZE >= 128
- if (y <= 64) {
- err = fp_sqr_comba64(A,B);
- goto clean;
- }
-#endif
- err = fp_sqr_comba(A, B);
-
-clean:
- /* zero any excess digits on the destination that we didn't write to */
- for (y = B->used; y >= 0 && y < oldused; y++) {
- B->dp[y] = 0;
- }
-
- return err;
-}
-
-/* generic comba squarer */
-int fp_sqr_comba(fp_int *A, fp_int *B)
-{
- int pa, ix, iz;
- fp_digit c0, c1, c2;
-#ifdef TFM_ISO
- fp_word tt;
-#endif
- fp_int *dst;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[1];
-#else
- fp_int *tmp;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (tmp == NULL)
- return FP_MEM;
-#endif
-
- /* get size of output and trim */
- pa = A->used + A->used;
- if (pa >= FP_SIZE) {
- pa = FP_SIZE-1;
- }
-
- /* number of output digits to produce */
- COMBA_START;
- COMBA_CLEAR;
-
- if (A == B) {
- fp_init(tmp);
- dst = tmp;
- } else {
- fp_zero(B);
- dst = B;
- }
-
- for (ix = 0; ix < pa; ix++) {
- int tx, ty, iy;
- fp_digit *tmpy, *tmpx;
-
- /* get offsets into the two bignums */
- ty = MIN(A->used-1, ix);
- tx = ix - ty;
-
- /* setup temp aliases */
- tmpx = A->dp + tx;
- tmpy = A->dp + ty;
-
- /* this is the number of times the loop will iterate,
- while (tx++ < a->used && ty-- >= 0) { ... }
- */
- iy = MIN(A->used-tx, ty+1);
-
- /* now for squaring tx can never equal ty
- * we halve the distance since they approach
- * at a rate of 2x and we have to round because
- * odd cases need to be executed
- */
- iy = MIN(iy, (ty-tx+1)>>1);
-
- /* forward carries */
- COMBA_FORWARD;
-
- /* execute loop */
- for (iz = 0; iz < iy; iz++) {
- SQRADD2(*tmpx++, *tmpy--);
- }
-
- /* even columns have the square term in them */
- if ((ix&1) == 0) {
- /* TAO change COMBA_ADD back to SQRADD */
- SQRADD(A->dp[ix>>1], A->dp[ix>>1]);
- }
-
- /* store it */
- COMBA_STORE(dst->dp[ix]);
- }
-
- COMBA_FINI;
-
- /* setup dest */
- dst->used = pa;
- fp_clamp (dst);
- if (dst != B) {
- fp_copy(dst, B);
- }
-
- /* Variables used but not seen by cppcheck. */
- (void)c0; (void)c1; (void)c2;
-#ifdef TFM_ISO
- (void)tt;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-int fp_cmp(fp_int *a, fp_int *b)
-{
- if (a->sign == FP_NEG && b->sign == FP_ZPOS) {
- return FP_LT;
- } else if (a->sign == FP_ZPOS && b->sign == FP_NEG) {
- return FP_GT;
- } else {
- /* compare digits */
- if (a->sign == FP_NEG) {
- /* if negative compare opposite direction */
- return fp_cmp_mag(b, a);
- } else {
- return fp_cmp_mag(a, b);
- }
- }
-}
-
-/* compare against a single digit */
-int fp_cmp_d(fp_int *a, fp_digit b)
-{
- /* special case for zero*/
- if (a->used == 0 && b == 0)
- return FP_EQ;
-
- /* compare based on sign */
- if ((b && a->used == 0) || a->sign == FP_NEG) {
- return FP_LT;
- }
-
- /* compare based on magnitude */
- if (a->used > 1) {
- return FP_GT;
- }
-
- /* compare the only digit of a to b */
- if (a->dp[0] > b) {
- return FP_GT;
- } else if (a->dp[0] < b) {
- return FP_LT;
- } else {
- return FP_EQ;
- }
-
-}
-
-int fp_cmp_mag(fp_int *a, fp_int *b)
-{
- int x;
-
- if (a->used > b->used) {
- return FP_GT;
- } else if (a->used < b->used) {
- return FP_LT;
- } else {
- for (x = a->used - 1; x >= 0; x--) {
- if (a->dp[x] > b->dp[x]) {
- return FP_GT;
- } else if (a->dp[x] < b->dp[x]) {
- return FP_LT;
- }
- }
- }
- return FP_EQ;
-}
-
-/* sets up the montgomery reduction */
-int fp_montgomery_setup(fp_int *a, fp_digit *rho)
-{
- fp_digit x, b;
-
-/* fast inversion mod 2**k
- *
- * Based on the fact that
- *
- * XA = 1 (mod 2**n) => (X(2-XA)) A = 1 (mod 2**2n)
- * => 2*X*A - X*X*A*A = 1
- * => 2*(1) - (1) = 1
- */
- b = a->dp[0];
-
- if ((b & 1) == 0) {
- return FP_VAL;
- }
-
- x = (((b + 2) & 4) << 1) + b; /* here x*a==1 mod 2**4 */
- x *= 2 - b * x; /* here x*a==1 mod 2**8 */
- x *= 2 - b * x; /* here x*a==1 mod 2**16 */
- x *= 2 - b * x; /* here x*a==1 mod 2**32 */
-#ifdef FP_64BIT
- x *= 2 - b * x; /* here x*a==1 mod 2**64 */
-#endif
-
- /* rho = -1/m mod b */
- *rho = (fp_digit) (((fp_word) 1 << ((fp_word) DIGIT_BIT)) - ((fp_word)x));
-
- return FP_OKAY;
-}
-
-/* computes a = B**n mod b without division or multiplication useful for
- * normalizing numbers in a Montgomery system.
- */
-void fp_montgomery_calc_normalization(fp_int *a, fp_int *b)
-{
- int x, bits;
-
- /* how many bits of last digit does b use */
- bits = fp_count_bits (b) % DIGIT_BIT;
- if (!bits) bits = DIGIT_BIT;
-
- /* compute A = B^(n-1) * 2^(bits-1) */
- if (b->used > 1) {
- fp_2expt (a, (b->used - 1) * DIGIT_BIT + bits - 1);
- } else {
- fp_set(a, 1);
- bits = 1;
- }
-
- /* now compute C = A * B mod b */
- for (x = bits - 1; x < (int)DIGIT_BIT; x++) {
- fp_mul_2 (a, a);
- if (fp_cmp_mag (a, b) != FP_LT) {
- s_fp_sub (a, b, a);
- }
- }
-}
-
-
-#ifdef TFM_SMALL_MONT_SET
- #include "fp_mont_small.i"
-#endif
-
-#ifdef HAVE_INTEL_MULX
-static WC_INLINE void innermul8_mulx(fp_digit *c_mulx, fp_digit *cy_mulx, fp_digit *tmpm, fp_digit mu)
-{
- fp_digit cy = *cy_mulx ;
- INNERMUL8_MULX ;
- *cy_mulx = cy ;
-}
-
-/* computes x/R == x (mod N) via Montgomery Reduction */
-static int fp_montgomery_reduce_mulx(fp_int *a, fp_int *m, fp_digit mp)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_digit c[FP_SIZE+1];
-#else
- fp_digit *c;
-#endif
- fp_digit *_c, *tmpm, mu = 0;
- int oldused, x, y, pa;
-
- /* bail if too large */
- if (m->used > (FP_SIZE/2)) {
- (void)mu; /* shut up compiler */
- return FP_OKAY;
- }
-
-#ifdef TFM_SMALL_MONT_SET
- if (m->used <= 16) {
- return fp_montgomery_reduce_small(a, m, mp);
- }
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- /* only allocate space for what's needed for window plus res */
- c = (fp_digit*)XMALLOC(sizeof(fp_digit)*(FP_SIZE + 1), NULL, DYNAMIC_TYPE_BIGINT);
- if (c == NULL) {
- return FP_MEM;
- }
-#endif
-
- /* now zero the buff */
- XMEMSET(c, 0, sizeof(fp_digit)*(FP_SIZE + 1));
- pa = m->used;
-
- /* copy the input */
- oldused = a->used;
- for (x = 0; x < oldused; x++) {
- c[x] = a->dp[x];
- }
- MONT_START;
-
- for (x = 0; x < pa; x++) {
- fp_digit cy = 0;
- /* get Mu for this round */
- LOOP_START;
- _c = c + x;
- tmpm = m->dp;
- y = 0;
- for (; y < (pa & ~7); y += 8) {
- innermul8_mulx(_c, &cy, tmpm, mu) ;
- _c += 8;
- tmpm += 8;
- }
- for (; y < pa; y++) {
- INNERMUL;
- ++_c;
- }
- LOOP_END;
- while (cy) {
- PROPCARRY;
- ++_c;
- }
- }
-
- /* now copy out */
- _c = c + pa;
- tmpm = a->dp;
- for (x = 0; x < pa+1; x++) {
- *tmpm++ = *_c++;
- }
-
- /* zero any excess digits on the destination that we didn't write to */
- for (; x < oldused; x++) {
- *tmpm++ = 0;
- }
-
- MONT_FINI;
-
- a->used = pa+1;
- fp_clamp(a);
-
- /* if A >= m then A = A - m */
- if (fp_cmp_mag (a, m) != FP_LT) {
- s_fp_sub (a, m, a);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(c, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-#endif
-
-/* computes x/R == x (mod N) via Montgomery Reduction */
-int fp_montgomery_reduce(fp_int *a, fp_int *m, fp_digit mp)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_digit c[FP_SIZE+1];
-#else
- fp_digit *c;
-#endif
- fp_digit *_c, *tmpm, mu = 0;
- int oldused, x, y, pa, err = 0;
-
- IF_HAVE_INTEL_MULX(err = fp_montgomery_reduce_mulx(a, m, mp), return err) ;
- (void)err;
-
- /* bail if too large */
- if (m->used > (FP_SIZE/2)) {
- (void)mu; /* shut up compiler */
- return FP_OKAY;
- }
-
-#ifdef TFM_SMALL_MONT_SET
- if (m->used <= 16) {
- return fp_montgomery_reduce_small(a, m, mp);
- }
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- /* only allocate space for what's needed for window plus res */
- c = (fp_digit*)XMALLOC(sizeof(fp_digit)*(FP_SIZE + 1), NULL, DYNAMIC_TYPE_BIGINT);
- if (c == NULL) {
- return FP_MEM;
- }
-#endif
-
- /* now zero the buff */
- XMEMSET(c, 0, sizeof(fp_digit)*(FP_SIZE + 1));
- pa = m->used;
-
- /* copy the input */
- oldused = a->used;
- for (x = 0; x < oldused; x++) {
- c[x] = a->dp[x];
- }
- MONT_START;
-
- for (x = 0; x < pa; x++) {
- fp_digit cy = 0;
- /* get Mu for this round */
- LOOP_START;
- _c = c + x;
- tmpm = m->dp;
- y = 0;
-#if defined(INNERMUL8)
- for (; y < (pa & ~7); y += 8) {
- INNERMUL8 ;
- _c += 8;
- tmpm += 8;
- }
-#endif
- for (; y < pa; y++) {
- INNERMUL;
- ++_c;
- }
- LOOP_END;
- while (cy) {
- PROPCARRY;
- ++_c;
- }
- }
-
- /* now copy out */
- _c = c + pa;
- tmpm = a->dp;
- for (x = 0; x < pa+1; x++) {
- *tmpm++ = *_c++;
- }
-
- /* zero any excess digits on the destination that we didn't write to */
- for (; x < oldused; x++) {
- *tmpm++ = 0;
- }
-
- MONT_FINI;
-
- a->used = pa+1;
- fp_clamp(a);
-
- /* if A >= m then A = A - m */
- if (fp_cmp_mag (a, m) != FP_LT) {
- s_fp_sub (a, m, a);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(c, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-void fp_read_unsigned_bin(fp_int *a, const unsigned char *b, int c)
-{
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- const word32 maxC = (a->size * sizeof(fp_digit));
-#else
- const word32 maxC = (FP_SIZE * sizeof(fp_digit));
-#endif
-
- /* zero the int */
- fp_zero (a);
-
- /* if input b excess max, then truncate */
- if (c > 0 && (word32)c > maxC) {
- int excess = (c - maxC);
- c -= excess;
- b += excess;
- }
-
- /* If we know the endianness of this architecture, and we're using
- 32-bit fp_digits, we can optimize this */
-#if (defined(LITTLE_ENDIAN_ORDER) || defined(BIG_ENDIAN_ORDER)) && \
- defined(FP_32BIT)
- /* But not for both simultaneously */
-#if defined(LITTLE_ENDIAN_ORDER) && defined(BIG_ENDIAN_ORDER)
-#error Both LITTLE_ENDIAN_ORDER and BIG_ENDIAN_ORDER defined.
-#endif
- {
- unsigned char *pd = (unsigned char *)a->dp;
-
- a->used = (c + sizeof(fp_digit) - 1)/sizeof(fp_digit);
- /* read the bytes in */
-#ifdef BIG_ENDIAN_ORDER
- {
- /* Use Duff's device to unroll the loop. */
- int idx = (c - 1) & ~3;
- switch (c % 4) {
- case 0: do { pd[idx+0] = *b++; // fallthrough
- case 3: pd[idx+1] = *b++; // fallthrough
- case 2: pd[idx+2] = *b++; // fallthrough
- case 1: pd[idx+3] = *b++; // fallthrough
- idx -= 4;
- } while ((c -= 4) > 0);
- }
- }
-#else
- for (c -= 1; c >= 0; c -= 1) {
- pd[c] = *b++;
- }
-#endif
- }
-#else
- /* read the bytes in */
- for (; c > 0; c--) {
- fp_mul_2d (a, 8, a);
- a->dp[0] |= *b++;
-
- if (a->used == 0) {
- a->used = 1;
- }
- }
-#endif
- fp_clamp (a);
-}
-
-int fp_to_unsigned_bin_at_pos(int x, fp_int *t, unsigned char *b)
-{
-#if DIGIT_BIT == 64 || DIGIT_BIT == 32
- int i, j;
- fp_digit n;
-
- for (j=0,i=0; i<t->used-1; ) {
- b[x++] = (unsigned char)(t->dp[i] >> j);
- j += 8;
- i += j == DIGIT_BIT;
- j &= DIGIT_BIT - 1;
- }
- n = t->dp[i];
- while (n != 0) {
- b[x++] = (unsigned char)n;
- n >>= 8;
- }
- return x;
-#else
- while (fp_iszero (t) == FP_NO) {
- b[x++] = (unsigned char) (t->dp[0] & 255);
- fp_div_2d (t, 8, t, NULL);
- }
- return x;
-#endif
-}
-
-int fp_to_unsigned_bin(fp_int *a, unsigned char *b)
-{
- int x;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init_copy(t, a);
-
- x = fp_to_unsigned_bin_at_pos(0, t, b);
- fp_reverse (b, x);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-int fp_to_unsigned_bin_len(fp_int *a, unsigned char *b, int c)
-{
-#if DIGIT_BIT == 64 || DIGIT_BIT == 32
- int i, j, x;
-
- for (x=c-1,j=0,i=0; x >= 0; x--) {
- b[x] = (unsigned char)(a->dp[i] >> j);
- j += 8;
- i += j == DIGIT_BIT;
- j &= DIGIT_BIT - 1;
- }
-
- return FP_OKAY;
-#else
- int x;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init_copy(t, a);
-
- for (x = 0; x < c; x++) {
- b[x] = (unsigned char) (t->dp[0] & 255);
- fp_div_2d (t, 8, t, NULL);
- }
- fp_reverse (b, x);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-#endif
-}
-
-int fp_unsigned_bin_size(fp_int *a)
-{
- int size = fp_count_bits (a);
- return (size / 8 + ((size & 7) != 0 ? 1 : 0));
-}
-
-void fp_set(fp_int *a, fp_digit b)
-{
- fp_zero(a);
- a->dp[0] = b;
- a->used = a->dp[0] ? 1 : 0;
-}
-
-
-#ifndef MP_SET_CHUNK_BITS
- #define MP_SET_CHUNK_BITS 4
-#endif
-void fp_set_int(fp_int *a, unsigned long b)
-{
- int x;
-
- /* use direct fp_set if b is less than fp_digit max */
- if (b < FP_DIGIT_MAX) {
- fp_set (a, (fp_digit)b);
- return;
- }
-
- fp_zero (a);
-
- /* set chunk bits at a time */
- for (x = 0; x < (int)(sizeof(b) * 8) / MP_SET_CHUNK_BITS; x++) {
- fp_mul_2d (a, MP_SET_CHUNK_BITS, a);
-
- /* OR in the top bits of the source */
- a->dp[0] |= (b >> ((sizeof(b) * 8) - MP_SET_CHUNK_BITS)) &
- ((1 << MP_SET_CHUNK_BITS) - 1);
-
- /* shift the source up to the next chunk bits */
- b <<= MP_SET_CHUNK_BITS;
-
- /* ensure that digits are not clamped off */
- a->used += 1;
- }
-
- /* clamp digits */
- fp_clamp(a);
-}
-
-/* check if a bit is set */
-int fp_is_bit_set (fp_int *a, fp_digit b)
-{
- fp_digit i;
-
- if (b > FP_MAX_BITS)
- return 0;
- else
- i = b/DIGIT_BIT;
-
- if ((fp_digit)a->used < i)
- return 0;
-
- return (int)((a->dp[i] >> b%DIGIT_BIT) & (fp_digit)1);
-}
-
-/* set the b bit of a */
-int fp_set_bit (fp_int * a, fp_digit b)
-{
- fp_digit i;
-
- if (b > FP_MAX_BITS)
- return 0;
- else
- i = b/DIGIT_BIT;
-
- /* set the used count of where the bit will go if required */
- if (a->used < (int)(i+1))
- a->used = (int)(i+1);
-
- /* put the single bit in its place */
- a->dp[i] |= ((fp_digit)1) << (b % DIGIT_BIT);
-
- return MP_OKAY;
-}
-
-int fp_count_bits (fp_int * a)
-{
- int r;
- fp_digit q;
-
- /* shortcut */
- if (a->used == 0) {
- return 0;
- }
-
- /* get number of digits and add that */
- r = (a->used - 1) * DIGIT_BIT;
-
- /* take the last digit and count the bits in it */
- q = a->dp[a->used - 1];
- while (q > ((fp_digit) 0)) {
- ++r;
- q >>= ((fp_digit) 1);
- }
-
- return r;
-}
-
-int fp_leading_bit(fp_int *a)
-{
- int bit = 0;
-
- if (a->used != 0) {
- fp_digit q = a->dp[a->used - 1];
- int qSz = sizeof(fp_digit);
-
- while (qSz > 0) {
- if ((unsigned char)q != 0)
- bit = (q & 0x80) != 0;
- q >>= 8;
- qSz--;
- }
- }
-
- return bit;
-}
-
-void fp_lshd(fp_int *a, int x)
-{
- int y;
-
- /* move up and truncate as required */
- y = MIN(a->used + x - 1, (int)(FP_SIZE-1));
-
- /* store new size */
- a->used = y + 1;
-
- /* move digits */
- for (; y >= x; y--) {
- a->dp[y] = a->dp[y-x];
- }
-
- /* zero lower digits */
- for (; y >= 0; y--) {
- a->dp[y] = 0;
- }
-
- /* clamp digits */
- fp_clamp(a);
-}
-
-
-/* right shift by bit count */
-void fp_rshb(fp_int *c, int x)
-{
- fp_digit *tmpc, mask, shift;
- fp_digit r, rr;
- fp_digit D = x;
-
- if (fp_iszero(c)) return;
-
- /* mask */
- mask = (((fp_digit)1) << D) - 1;
-
- /* shift for lsb */
- shift = DIGIT_BIT - D;
-
- /* alias */
- tmpc = c->dp + (c->used - 1);
-
- /* carry */
- r = 0;
- for (x = c->used - 1; x >= 0; x--) {
- /* get the lower bits of this word in a temp */
- rr = *tmpc & mask;
-
- /* shift the current word and mix in the carry bits from previous word */
- *tmpc = (*tmpc >> D) | (r << shift);
- --tmpc;
-
- /* set the carry to the carry bits of the current word found above */
- r = rr;
- }
-
- /* clamp digits */
- fp_clamp(c);
-}
-
-
-void fp_rshd(fp_int *a, int x)
-{
- int y;
-
- /* too many digits just zero and return */
- if (x >= a->used) {
- fp_zero(a);
- return;
- }
-
- /* shift */
- for (y = 0; y < a->used - x; y++) {
- a->dp[y] = a->dp[y+x];
- }
-
- /* zero rest */
- for (; y < a->used; y++) {
- a->dp[y] = 0;
- }
-
- /* decrement count */
- a->used -= x;
- fp_clamp(a);
-}
-
-/* reverse an array, used for radix code */
-void fp_reverse (unsigned char *s, int len)
-{
- int ix, iy;
- unsigned char t;
-
- ix = 0;
- iy = len - 1;
- while (ix < iy) {
- t = s[ix];
- s[ix] = s[iy];
- s[iy] = t;
- ++ix;
- --iy;
- }
-}
-
-
-/* c = a - b */
-int fp_sub_d(fp_int *a, fp_digit b, fp_int *c)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int tmp[1];
-#else
- fp_int *tmp;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- tmp = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (tmp == NULL)
- return FP_MEM;
-#endif
-
- fp_init(tmp);
- fp_set(tmp, b);
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- if (c->size < FP_SIZE) {
- fp_sub(a, tmp, tmp);
- fp_copy(tmp, c);
- } else
-#endif
- {
- fp_sub(a, tmp, c);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(tmp, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-
-/* wolfSSL callers from normal lib */
-
-/* init a new mp_int */
-int mp_init (mp_int * a)
-{
- if (a)
- fp_init(a);
- return MP_OKAY;
-}
-
-void fp_init(fp_int *a)
-{
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- a->size = FP_SIZE;
-#endif
-#ifdef HAVE_WOLF_BIGINT
- wc_bigint_init(&a->raw);
-#endif
- fp_zero(a);
-}
-
-void fp_zero(fp_int *a)
-{
- int size;
- a->used = 0;
- a->sign = FP_ZPOS;
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- size = a->size;
-#else
- size = FP_SIZE;
-#endif
- XMEMSET(a->dp, 0, size * sizeof(fp_digit));
-}
-
-void fp_clear(fp_int *a)
-{
- int size;
- a->used = 0;
- a->sign = FP_ZPOS;
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- size = a->size;
-#else
- size = FP_SIZE;
-#endif
- XMEMSET(a->dp, 0, size * sizeof(fp_digit));
- fp_free(a);
-}
-
-void fp_forcezero (mp_int * a)
-{
- int size;
- a->used = 0;
- a->sign = FP_ZPOS;
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- size = a->size;
-#else
- size = FP_SIZE;
-#endif
- ForceZero(a->dp, size * sizeof(fp_digit));
-#ifdef HAVE_WOLF_BIGINT
- wc_bigint_zero(&a->raw);
-#endif
- fp_free(a);
-}
-
-void mp_forcezero (mp_int * a)
-{
- fp_forcezero(a);
-}
-
-void fp_free(fp_int* a)
-{
-#ifdef HAVE_WOLF_BIGINT
- wc_bigint_free(&a->raw);
-#else
- (void)a;
-#endif
-}
-
-
-/* clear one (frees) */
-void mp_clear (mp_int * a)
-{
- if (a == NULL)
- return;
- fp_clear(a);
-}
-
-void mp_free(mp_int* a)
-{
- fp_free(a);
-}
-
-/* handle up to 6 inits */
-int mp_init_multi(mp_int* a, mp_int* b, mp_int* c, mp_int* d,
- mp_int* e, mp_int* f)
-{
- if (a)
- fp_init(a);
- if (b)
- fp_init(b);
- if (c)
- fp_init(c);
- if (d)
- fp_init(d);
- if (e)
- fp_init(e);
- if (f)
- fp_init(f);
-
- return MP_OKAY;
-}
-
-/* high level addition (handles signs) */
-int mp_add (mp_int * a, mp_int * b, mp_int * c)
-{
- fp_add(a, b, c);
- return MP_OKAY;
-}
-
-/* high level subtraction (handles signs) */
-int mp_sub (mp_int * a, mp_int * b, mp_int * c)
-{
- fp_sub(a, b, c);
- return MP_OKAY;
-}
-
-/* high level multiplication (handles sign) */
-#if defined(FREESCALE_LTC_TFM)
-int wolfcrypt_mp_mul(mp_int * a, mp_int * b, mp_int * c)
-#else
-int mp_mul (mp_int * a, mp_int * b, mp_int * c)
-#endif
-{
- return fp_mul(a, b, c);
-}
-
-int mp_mul_d (mp_int * a, mp_digit b, mp_int * c)
-{
- fp_mul_d(a, b, c);
- return MP_OKAY;
-}
-
-/* d = a * b (mod c) */
-#if defined(FREESCALE_LTC_TFM)
-int wolfcrypt_mp_mulmod (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
-#else
-int mp_mulmod (mp_int * a, mp_int * b, mp_int * c, mp_int * d)
-#endif
-{
- #if defined(WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI) && \
- !defined(NO_WOLFSSL_ESP32WROOM32_CRYPT_RSA_PRI)
- int A = fp_count_bits (a);
- int B = fp_count_bits (b);
-
- if( A >= ESP_RSA_MULM_BITS && B >= ESP_RSA_MULM_BITS)
- return esp_mp_mulmod(a, b, c, d);
- else
- #endif
- return fp_mulmod(a, b, c, d);
-}
-
-/* d = a - b (mod c) */
-int mp_submod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
-{
- return fp_submod(a, b, c, d);
-}
-
-/* d = a + b (mod c) */
-int mp_addmod(mp_int *a, mp_int *b, mp_int *c, mp_int *d)
-{
- return fp_addmod(a, b, c, d);
-}
-
-/* c = a mod b, 0 <= c < b */
-#if defined(FREESCALE_LTC_TFM)
-int wolfcrypt_mp_mod (mp_int * a, mp_int * b, mp_int * c)
-#else
-int mp_mod (mp_int * a, mp_int * b, mp_int * c)
-#endif
-{
- return fp_mod (a, b, c);
-}
-
-/* hac 14.61, pp608 */
-#if defined(FREESCALE_LTC_TFM)
-int wolfcrypt_mp_invmod (mp_int * a, mp_int * b, mp_int * c)
-#else
-int mp_invmod (mp_int * a, mp_int * b, mp_int * c)
-#endif
-{
- return fp_invmod(a, b, c);
-}
-
-/* hac 14.61, pp608 */
-int mp_invmod_mont_ct (mp_int * a, mp_int * b, mp_int * c, mp_digit mp)
-{
- return fp_invmod_mont_ct(a, b, c, mp);
-}
-
-/* this is a shell function that calls either the normal or Montgomery
- * exptmod functions. Originally the call to the montgomery code was
- * embedded in the normal function but that wasted a lot of stack space
- * for nothing (since 99% of the time the Montgomery code would be called)
- */
-#if defined(FREESCALE_LTC_TFM)
-int wolfcrypt_mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y)
-#else
-int mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y)
-#endif
-{
- return fp_exptmod(G, X, P, Y);
-}
-
-int mp_exptmod_ex (mp_int * G, mp_int * X, int digits, mp_int * P, mp_int * Y)
-{
- return fp_exptmod_ex(G, X, digits, P, Y);
-}
-
-int mp_exptmod_nct (mp_int * G, mp_int * X, mp_int * P, mp_int * Y)
-{
- return fp_exptmod_nct(G, X, P, Y);
-}
-
-
-/* compare two ints (signed)*/
-int mp_cmp (mp_int * a, mp_int * b)
-{
- return fp_cmp(a, b);
-}
-
-/* compare a digit */
-int mp_cmp_d(mp_int * a, mp_digit b)
-{
- return fp_cmp_d(a, b);
-}
-
-/* get the size for an unsigned equivalent */
-int mp_unsigned_bin_size (mp_int * a)
-{
- return fp_unsigned_bin_size(a);
-}
-
-int mp_to_unsigned_bin_at_pos(int x, fp_int *t, unsigned char *b)
-{
- return fp_to_unsigned_bin_at_pos(x, t, b);
-}
-
-/* store in unsigned [big endian] format */
-int mp_to_unsigned_bin (mp_int * a, unsigned char *b)
-{
- return fp_to_unsigned_bin(a,b);
-}
-
-int mp_to_unsigned_bin_len(mp_int * a, unsigned char *b, int c)
-{
- return fp_to_unsigned_bin_len(a, b, c);
-}
-/* reads a unsigned char array, assumes the msb is stored first [big endian] */
-int mp_read_unsigned_bin (mp_int * a, const unsigned char *b, int c)
-{
- fp_read_unsigned_bin(a, b, c);
- return MP_OKAY;
-}
-
-
-int mp_sub_d(fp_int *a, fp_digit b, fp_int *c)
-{
- return fp_sub_d(a, b, c);
-}
-
-int mp_mul_2d(fp_int *a, int b, fp_int *c)
-{
- fp_mul_2d(a, b, c);
- return MP_OKAY;
-}
-
-int mp_2expt(fp_int* a, int b)
-{
- fp_2expt(a, b);
- return MP_OKAY;
-}
-
-int mp_div(fp_int * a, fp_int * b, fp_int * c, fp_int * d)
-{
- return fp_div(a, b, c, d);
-}
-
-int mp_div_2d(fp_int* a, int b, fp_int* c, fp_int* d)
-{
- fp_div_2d(a, b, c, d);
- return MP_OKAY;
-}
-
-void fp_copy(fp_int *a, fp_int *b)
-{
- /* if source and destination are different */
- if (a != b) {
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- /* verify a will fit in b */
- if (b->size >= a->used) {
- int x, oldused;
- oldused = b->used;
- b->used = a->used;
- b->sign = a->sign;
-
- XMEMCPY(b->dp, a->dp, a->used * sizeof(fp_digit));
-
- /* zero any excess digits on the destination that we didn't write to */
- for (x = b->used; x >= 0 && x < oldused; x++) {
- b->dp[x] = 0;
- }
- }
- else {
- /* TODO: Handle error case */
- }
-#else
- /* all dp's are same size, so do straight copy */
- b->used = a->used;
- b->sign = a->sign;
- XMEMCPY(b->dp, a->dp, FP_SIZE * sizeof(fp_digit));
-#endif
- }
-}
-
-void fp_init_copy(fp_int *a, fp_int* b)
-{
- if (a != b) {
- fp_init(a);
- fp_copy(b, a);
- }
-}
-
-/* fast math wrappers */
-int mp_copy(fp_int* a, fp_int* b)
-{
- fp_copy(a, b);
- return MP_OKAY;
-}
-
-int mp_isodd(mp_int* a)
-{
- return fp_isodd(a);
-}
-
-int mp_iszero(mp_int* a)
-{
- return fp_iszero(a);
-}
-
-int mp_count_bits (mp_int* a)
-{
- return fp_count_bits(a);
-}
-
-int mp_leading_bit (mp_int* a)
-{
- return fp_leading_bit(a);
-}
-
-void mp_rshb (mp_int* a, int x)
-{
- fp_rshb(a, x);
-}
-
-void mp_rshd (mp_int* a, int x)
-{
- fp_rshd(a, x);
-}
-
-int mp_set_int(mp_int *a, unsigned long b)
-{
- fp_set_int(a, b);
- return MP_OKAY;
-}
-
-int mp_is_bit_set (mp_int *a, mp_digit b)
-{
- return fp_is_bit_set(a, b);
-}
-
-int mp_set_bit(mp_int *a, mp_digit b)
-{
- return fp_set_bit(a, b);
-}
-
-#if defined(WOLFSSL_KEY_GEN) || defined (HAVE_ECC) || !defined(NO_DH) || \
- !defined(NO_DSA) || !defined(NO_RSA)
-
-/* c = a * a (mod b) */
-int fp_sqrmod(fp_int *a, fp_int *b, fp_int *c)
-{
- int err;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- fp_init(t);
- err = fp_sqr(a, t);
- if (err == FP_OKAY) {
- #if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- if (c->size < FP_SIZE) {
- err = fp_mod(t, b, t);
- fp_copy(t, c);
- }
- else
- #endif
- {
- err = fp_mod(t, b, c);
- }
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-/* fast math conversion */
-int mp_sqrmod(mp_int *a, mp_int *b, mp_int *c)
-{
- return fp_sqrmod(a, b, c);
-}
-
-/* fast math conversion */
-int mp_montgomery_calc_normalization(mp_int *a, mp_int *b)
-{
- fp_montgomery_calc_normalization(a, b);
- return MP_OKAY;
-}
-
-#endif /* WOLFSSL_KEYGEN || HAVE_ECC */
-
-
-#if defined(WC_MP_TO_RADIX) || !defined(NO_DH) || !defined(NO_DSA) || \
- !defined(NO_RSA)
-
-#ifdef WOLFSSL_KEY_GEN
-/* swap the elements of two integers, for cases where you can't simply swap the
- * mp_int pointers around
- */
-static int fp_exch (fp_int * a, fp_int * b)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- *t = *a;
- *a = *b;
- *b = *t;
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-#endif
-
-static const int lnz[16] = {
- 4, 0, 1, 0, 2, 0, 1, 0, 3, 0, 1, 0, 2, 0, 1, 0
-};
-
-/* Counts the number of lsbs which are zero before the first zero bit */
-int fp_cnt_lsb(fp_int *a)
-{
- int x;
- fp_digit q, qq;
-
- /* easy out */
- if (fp_iszero(a) == FP_YES) {
- return 0;
- }
-
- /* scan lower digits until non-zero */
- for (x = 0; x < a->used && a->dp[x] == 0; x++) {}
- q = a->dp[x];
- x *= DIGIT_BIT;
-
- /* now scan this digit until a 1 is found */
- if ((q & 1) == 0) {
- do {
- qq = q & 15;
- x += lnz[qq];
- q >>= 4;
- } while (qq == 0);
- }
- return x;
-}
-
-
-static int s_is_power_of_two(fp_digit b, int *p)
-{
- int x;
-
- /* fast return if no power of two */
- if ((b==0) || (b & (b-1))) {
- return FP_NO;
- }
-
- for (x = 0; x < DIGIT_BIT; x++) {
- if (b == (((fp_digit)1)<<x)) {
- *p = x;
- return FP_YES;
- }
- }
- return FP_NO;
-}
-
-/* a/b => cb + d == a */
-static int fp_div_d(fp_int *a, fp_digit b, fp_int *c, fp_digit *d)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int q[1];
-#else
- fp_int *q;
-#endif
- fp_word w;
- fp_digit t;
- int ix;
-
- /* cannot divide by zero */
- if (b == 0) {
- return FP_VAL;
- }
-
- /* quick outs */
- if (b == 1 || fp_iszero(a) == FP_YES) {
- if (d != NULL) {
- *d = 0;
- }
- if (c != NULL) {
- fp_copy(a, c);
- }
- return FP_OKAY;
- }
-
- /* power of two ? */
- if (s_is_power_of_two(b, &ix) == FP_YES) {
- if (d != NULL) {
- *d = a->dp[0] & ((((fp_digit)1)<<ix) - 1);
- }
- if (c != NULL) {
- fp_div_2d(a, ix, c, NULL);
- }
- return FP_OKAY;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- q = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (q == NULL)
- return FP_MEM;
-#endif
-
- fp_init(q);
-
- if (c != NULL) {
- q->used = a->used;
- q->sign = a->sign;
- }
-
- w = 0;
- for (ix = a->used - 1; ix >= 0; ix--) {
- w = (w << ((fp_word)DIGIT_BIT)) | ((fp_word)a->dp[ix]);
-
- if (w >= b) {
- t = (fp_digit)(w / b);
- w -= ((fp_word)t) * ((fp_word)b);
- } else {
- t = 0;
- }
- if (c != NULL)
- q->dp[ix] = (fp_digit)t;
- }
-
- if (d != NULL) {
- *d = (fp_digit)w;
- }
-
- if (c != NULL) {
- fp_clamp(q);
- fp_copy(q, c);
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(q, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-
-/* c = a mod b, 0 <= c < b */
-static int fp_mod_d(fp_int *a, fp_digit b, fp_digit *c)
-{
- return fp_div_d(a, b, NULL, c);
-}
-
-int mp_mod_d(fp_int *a, fp_digit b, fp_digit *c)
-{
- return fp_mod_d(a, b, c);
-}
-
-#endif /* WC_MP_TO_RADIX || !NO_DH || !NO_DSA || !NO_RSA */
-
-
-#if !defined(NO_DH) || !defined(NO_DSA) || !defined(NO_RSA) || \
- defined(WOLFSSL_KEY_GEN)
-
-static int fp_isprime_ex(fp_int *a, int t, int* result);
-
-
-int mp_prime_is_prime(mp_int* a, int t, int* result)
-{
- return fp_isprime_ex(a, t, result);
-}
-
-/* Miller-Rabin test of "a" to the base of "b" as described in
- * HAC pp. 139 Algorithm 4.24
- *
- * Sets result to 0 if definitely composite or 1 if probably prime.
- * Randomly the chance of error is no more than 1/4 and often
- * very much lower.
- */
-static int fp_prime_miller_rabin_ex(fp_int * a, fp_int * b, int *result,
- fp_int *n1, fp_int *y, fp_int *r)
-{
- int s, j;
- int err;
-
- /* default */
- *result = FP_NO;
-
- /* ensure b > 1 */
- if (fp_cmp_d(b, 1) != FP_GT) {
- return FP_OKAY;
- }
-
- /* get n1 = a - 1 */
- fp_copy(a, n1);
- err = fp_sub_d(n1, 1, n1);
- if (err != FP_OKAY) {
- return err;
- }
-
- /* set 2**s * r = n1 */
- fp_copy(n1, r);
-
- /* count the number of least significant bits
- * which are zero
- */
- s = fp_cnt_lsb(r);
-
- /* now divide n - 1 by 2**s */
- fp_div_2d (r, s, r, NULL);
-
- /* compute y = b**r mod a */
- fp_zero(y);
-#if (defined(WOLFSSL_HAVE_SP_RSA) && !defined(WOLFSSL_RSA_PUBLIC_ONLY)) || \
- defined(WOLFSSL_HAVE_SP_DH)
-#ifndef WOLFSSL_SP_NO_2048
- if (fp_count_bits(a) == 1024)
- sp_ModExp_1024(b, r, a, y);
- else if (fp_count_bits(a) == 2048)
- sp_ModExp_2048(b, r, a, y);
- else
-#endif
-#ifndef WOLFSSL_SP_NO_3072
- if (fp_count_bits(a) == 1536)
- sp_ModExp_1536(b, r, a, y);
- else if (fp_count_bits(a) == 3072)
- sp_ModExp_3072(b, r, a, y);
- else
-#endif
-#ifdef WOLFSSL_SP_4096
- if (fp_count_bits(a) == 4096)
- sp_ModExp_4096(b, r, a, y);
- else
-#endif
-#endif
- fp_exptmod(b, r, a, y);
-
- /* if y != 1 and y != n1 do */
- if (fp_cmp_d (y, 1) != FP_EQ && fp_cmp (y, n1) != FP_EQ) {
- j = 1;
- /* while j <= s-1 and y != n1 */
- while ((j <= (s - 1)) && fp_cmp (y, n1) != FP_EQ) {
- fp_sqrmod (y, a, y);
-
- /* if y == 1 then composite */
- if (fp_cmp_d (y, 1) == FP_EQ) {
- return FP_OKAY;
- }
- ++j;
- }
-
- /* if y != n1 then composite */
- if (fp_cmp (y, n1) != FP_EQ) {
- return FP_OKAY;
- }
- }
-
- /* probably prime now */
- *result = FP_YES;
-
- return FP_OKAY;
-}
-
-static int fp_prime_miller_rabin(fp_int * a, fp_int * b, int *result)
-{
- int err;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int n1[1], y[1], r[1];
-#else
- fp_int *n1, *y, *r;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- n1 = (fp_int*)XMALLOC(sizeof(fp_int) * 3, NULL, DYNAMIC_TYPE_BIGINT);
- if (n1 == NULL) {
- return FP_MEM;
- }
- y = &n1[1]; r = &n1[2];
-#endif
-
- fp_init(n1);
- fp_init(y);
- fp_init(r);
-
- err = fp_prime_miller_rabin_ex(a, b, result, n1, y, r);
-
- fp_clear(n1);
- fp_clear(y);
- fp_clear(r);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(n1, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
-
- return err;
-}
-
-
-/* a few primes */
-static const fp_digit primes[FP_PRIME_SIZE] = {
- 0x0002, 0x0003, 0x0005, 0x0007, 0x000B, 0x000D, 0x0011, 0x0013,
- 0x0017, 0x001D, 0x001F, 0x0025, 0x0029, 0x002B, 0x002F, 0x0035,
- 0x003B, 0x003D, 0x0043, 0x0047, 0x0049, 0x004F, 0x0053, 0x0059,
- 0x0061, 0x0065, 0x0067, 0x006B, 0x006D, 0x0071, 0x007F, 0x0083,
- 0x0089, 0x008B, 0x0095, 0x0097, 0x009D, 0x00A3, 0x00A7, 0x00AD,
- 0x00B3, 0x00B5, 0x00BF, 0x00C1, 0x00C5, 0x00C7, 0x00D3, 0x00DF,
- 0x00E3, 0x00E5, 0x00E9, 0x00EF, 0x00F1, 0x00FB, 0x0101, 0x0107,
- 0x010D, 0x010F, 0x0115, 0x0119, 0x011B, 0x0125, 0x0133, 0x0137,
-
- 0x0139, 0x013D, 0x014B, 0x0151, 0x015B, 0x015D, 0x0161, 0x0167,
- 0x016F, 0x0175, 0x017B, 0x017F, 0x0185, 0x018D, 0x0191, 0x0199,
- 0x01A3, 0x01A5, 0x01AF, 0x01B1, 0x01B7, 0x01BB, 0x01C1, 0x01C9,
- 0x01CD, 0x01CF, 0x01D3, 0x01DF, 0x01E7, 0x01EB, 0x01F3, 0x01F7,
- 0x01FD, 0x0209, 0x020B, 0x021D, 0x0223, 0x022D, 0x0233, 0x0239,
- 0x023B, 0x0241, 0x024B, 0x0251, 0x0257, 0x0259, 0x025F, 0x0265,
- 0x0269, 0x026B, 0x0277, 0x0281, 0x0283, 0x0287, 0x028D, 0x0293,
- 0x0295, 0x02A1, 0x02A5, 0x02AB, 0x02B3, 0x02BD, 0x02C5, 0x02CF,
-
- 0x02D7, 0x02DD, 0x02E3, 0x02E7, 0x02EF, 0x02F5, 0x02F9, 0x0301,
- 0x0305, 0x0313, 0x031D, 0x0329, 0x032B, 0x0335, 0x0337, 0x033B,
- 0x033D, 0x0347, 0x0355, 0x0359, 0x035B, 0x035F, 0x036D, 0x0371,
- 0x0373, 0x0377, 0x038B, 0x038F, 0x0397, 0x03A1, 0x03A9, 0x03AD,
- 0x03B3, 0x03B9, 0x03C7, 0x03CB, 0x03D1, 0x03D7, 0x03DF, 0x03E5,
- 0x03F1, 0x03F5, 0x03FB, 0x03FD, 0x0407, 0x0409, 0x040F, 0x0419,
- 0x041B, 0x0425, 0x0427, 0x042D, 0x043F, 0x0443, 0x0445, 0x0449,
- 0x044F, 0x0455, 0x045D, 0x0463, 0x0469, 0x047F, 0x0481, 0x048B,
-
- 0x0493, 0x049D, 0x04A3, 0x04A9, 0x04B1, 0x04BD, 0x04C1, 0x04C7,
- 0x04CD, 0x04CF, 0x04D5, 0x04E1, 0x04EB, 0x04FD, 0x04FF, 0x0503,
- 0x0509, 0x050B, 0x0511, 0x0515, 0x0517, 0x051B, 0x0527, 0x0529,
- 0x052F, 0x0551, 0x0557, 0x055D, 0x0565, 0x0577, 0x0581, 0x058F,
- 0x0593, 0x0595, 0x0599, 0x059F, 0x05A7, 0x05AB, 0x05AD, 0x05B3,
- 0x05BF, 0x05C9, 0x05CB, 0x05CF, 0x05D1, 0x05D5, 0x05DB, 0x05E7,
- 0x05F3, 0x05FB, 0x0607, 0x060D, 0x0611, 0x0617, 0x061F, 0x0623,
- 0x062B, 0x062F, 0x063D, 0x0641, 0x0647, 0x0649, 0x064D, 0x0653
-};
-
-int fp_isprime_ex(fp_int *a, int t, int* result)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int b[1];
-#else
- fp_int *b;
-#endif
- fp_digit d;
- int r, res;
-
- if (t <= 0 || t > FP_PRIME_SIZE) {
- *result = FP_NO;
- return FP_VAL;
- }
-
- if (fp_isone(a)) {
- *result = FP_NO;
- return FP_OKAY;
- }
-
- /* check against primes table */
- for (r = 0; r < FP_PRIME_SIZE; r++) {
- if (fp_cmp_d(a, primes[r]) == FP_EQ) {
- *result = FP_YES;
- return FP_OKAY;
- }
- }
-
- /* do trial division */
- for (r = 0; r < FP_PRIME_SIZE; r++) {
- res = fp_mod_d(a, primes[r], &d);
- if (res != MP_OKAY || d == 0) {
- *result = FP_NO;
- return FP_OKAY;
- }
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- b = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (b == NULL)
- return FP_MEM;
-#endif
- /* now do 't' miller rabins */
- fp_init(b);
- for (r = 0; r < t; r++) {
- fp_set(b, primes[r]);
- fp_prime_miller_rabin(a, b, &res);
- if (res == FP_NO) {
- *result = FP_NO;
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(b, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return FP_OKAY;
- }
- }
- *result = FP_YES;
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(b, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-
-int mp_prime_is_prime_ex(mp_int* a, int t, int* result, WC_RNG* rng)
-{
- int ret = FP_YES;
- fp_digit d;
- int i;
-
- if (a == NULL || result == NULL || rng == NULL)
- return FP_VAL;
-
- if (fp_isone(a)) {
- *result = FP_NO;
- return FP_OKAY;
- }
-
- /* check against primes table */
- for (i = 0; i < FP_PRIME_SIZE; i++) {
- if (fp_cmp_d(a, primes[i]) == FP_EQ) {
- *result = FP_YES;
- return FP_OKAY;
- }
- }
-
- /* do trial division */
- for (i = 0; i < FP_PRIME_SIZE; i++) {
- if (fp_mod_d(a, primes[i], &d) == MP_OKAY) {
- if (d == 0) {
- *result = FP_NO;
- return FP_OKAY;
- }
- }
- else
- return FP_VAL;
- }
-
-#ifndef WC_NO_RNG
- /* now do a miller rabin with up to t random numbers, this should
- * give a (1/4)^t chance of a false prime. */
- {
- #ifndef WOLFSSL_SMALL_STACK
- fp_int b[1], c[1], n1[1], y[1], r[1];
- byte base[FP_MAX_PRIME_SIZE];
- #else
- fp_int *b, *c, *n1, *y, *r;
- byte* base;
- #endif
- word32 baseSz;
- int err;
-
- baseSz = fp_count_bits(a);
- /* The base size is the number of bits / 8. One is added if the number
- * of bits isn't an even 8. */
- baseSz = (baseSz / 8) + ((baseSz % 8) ? 1 : 0);
-
- #ifndef WOLFSSL_SMALL_STACK
- if (baseSz > sizeof(base))
- return FP_MEM;
- #else
- base = (byte*)XMALLOC(baseSz, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- if (base == NULL)
- return FP_MEM;
-
- b = (fp_int*)XMALLOC(sizeof(fp_int) * 5, NULL, DYNAMIC_TYPE_BIGINT);
- if (b == NULL) {
- return FP_MEM;
- }
- c = &b[1]; n1 = &b[2]; y= &b[3]; r = &b[4];
- #endif
-
- fp_init(b);
- fp_init(c);
- fp_init(n1);
- fp_init(y);
- fp_init(r);
-
- err = fp_sub_d(a, 2, c);
- if (err != FP_OKAY) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(b, NULL, DYNAMIC_TYPE_BIGINT);
- XFREE(base, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
- while (t > 0) {
- if ((err = wc_RNG_GenerateBlock(rng, base, baseSz)) != 0) {
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(b, NULL, DYNAMIC_TYPE_BIGINT);
- XFREE(base, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return err;
- }
-
- fp_read_unsigned_bin(b, base, baseSz);
- if (fp_cmp_d(b, 2) != FP_GT || fp_cmp(b, c) != FP_LT) {
- continue;
- }
-
- fp_prime_miller_rabin_ex(a, b, &ret, n1, y, r);
- if (ret == FP_NO)
- break;
- fp_zero(b);
- t--;
- }
-
- fp_clear(n1);
- fp_clear(y);
- fp_clear(r);
- fp_clear(b);
- fp_clear(c);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(b, NULL, DYNAMIC_TYPE_BIGINT);
- XFREE(base, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- }
-#else
- (void)t;
-#endif /* !WC_NO_RNG */
-
- *result = ret;
- return FP_OKAY;
-}
-#endif /* !NO_RSA || !NO_DSA || !NO_DH || WOLFSSL_KEY_GEN */
-
-
-#ifdef WOLFSSL_KEY_GEN
-
-static int fp_gcd(fp_int *a, fp_int *b, fp_int *c);
-static int fp_lcm(fp_int *a, fp_int *b, fp_int *c);
-static int fp_randprime(fp_int* N, int len, WC_RNG* rng, void* heap);
-
-int mp_gcd(fp_int *a, fp_int *b, fp_int *c)
-{
- return fp_gcd(a, b, c);
-}
-
-
-int mp_lcm(fp_int *a, fp_int *b, fp_int *c)
-{
- return fp_lcm(a, b, c);
-}
-
-int mp_rand_prime(mp_int* N, int len, WC_RNG* rng, void* heap)
-{
- int err;
-
- err = fp_randprime(N, len, rng, heap);
- switch(err) {
- case FP_VAL:
- return MP_VAL;
- case FP_MEM:
- return MP_MEM;
- default:
- break;
- }
-
- return MP_OKAY;
-}
-
-int mp_exch (mp_int * a, mp_int * b)
-{
- return fp_exch(a, b);
-}
-
-
-
-int fp_randprime(fp_int* N, int len, WC_RNG* rng, void* heap)
-{
- static const int USE_BBS = 1;
- int err, type;
- int isPrime = FP_YES;
- /* Assume the candidate is probably prime and then test until
- * it is proven composite. */
- byte* buf;
-
- (void)heap;
-
- /* get type */
- if (len < 0) {
- type = USE_BBS;
- len = -len;
- } else {
- type = 0;
- }
-
- /* allow sizes between 2 and 512 bytes for a prime size */
- if (len < 2 || len > 512) {
- return FP_VAL;
- }
-
- /* allocate buffer to work with */
- buf = (byte*)XMALLOC(len, heap, DYNAMIC_TYPE_TMP_BUFFER);
- if (buf == NULL) {
- return FP_MEM;
- }
- XMEMSET(buf, 0, len);
-
- do {
-#ifdef SHOW_GEN
- printf(".");
- fflush(stdout);
-#endif
- /* generate value */
- err = wc_RNG_GenerateBlock(rng, buf, len);
- if (err != 0) {
- XFREE(buf, heap, DYNAMIC_TYPE_TMP_BUFFER);
- return FP_VAL;
- }
-
- /* munge bits */
- buf[0] |= 0x80 | 0x40;
- buf[len-1] |= 0x01 | ((type & USE_BBS) ? 0x02 : 0x00);
-
- /* load value */
- fp_read_unsigned_bin(N, buf, len);
-
- /* test */
- /* Running Miller-Rabin up to 3 times gives us a 2^{-80} chance
- * of a 1024-bit candidate being a false positive, when it is our
- * prime candidate. (Note 4.49 of Handbook of Applied Cryptography.)
- * Using 8 because we've always used 8 */
- mp_prime_is_prime_ex(N, 8, &isPrime, rng);
- } while (isPrime == FP_NO);
-
- XMEMSET(buf, 0, len);
- XFREE(buf, heap, DYNAMIC_TYPE_TMP_BUFFER);
-
- return FP_OKAY;
-}
-
-/* c = [a, b] */
-int fp_lcm(fp_int *a, fp_int *b, fp_int *c)
-{
- int err;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[2];
-#else
- fp_int *t;
-#endif
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int) * 2, NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL) {
- return FP_MEM;
- }
-#endif
-
- fp_init(&t[0]);
- fp_init(&t[1]);
- err = fp_gcd(a, b, &t[0]);
- if (err == FP_OKAY) {
- if (fp_cmp_mag(a, b) == FP_GT) {
- err = fp_div(a, &t[0], &t[1], NULL);
- if (err == FP_OKAY)
- err = fp_mul(b, &t[1], c);
- } else {
- err = fp_div(b, &t[0], &t[1], NULL);
- if (err == FP_OKAY)
- err = fp_mul(a, &t[1], c);
- }
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return err;
-}
-
-
-
-/* c = (a, b) */
-int fp_gcd(fp_int *a, fp_int *b, fp_int *c)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int u[1], v[1], r[1];
-#else
- fp_int *u, *v, *r;
-#endif
-
- /* either zero than gcd is the largest */
- if (fp_iszero (a) == FP_YES && fp_iszero (b) == FP_NO) {
- fp_abs (b, c);
- return FP_OKAY;
- }
- if (fp_iszero (a) == FP_NO && fp_iszero (b) == FP_YES) {
- fp_abs (a, c);
- return FP_OKAY;
- }
-
- /* optimized. At this point if a == 0 then
- * b must equal zero too
- */
- if (fp_iszero (a) == FP_YES) {
- fp_zero(c);
- return FP_OKAY;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- u = (fp_int*)XMALLOC(sizeof(fp_int) * 3, NULL, DYNAMIC_TYPE_BIGINT);
- if (u == NULL) {
- return FP_MEM;
- }
- v = &u[1]; r = &u[2];
-#endif
-
- /* sort inputs */
- if (fp_cmp_mag(a, b) != FP_LT) {
- fp_init_copy(u, a);
- fp_init_copy(v, b);
- } else {
- fp_init_copy(u, b);
- fp_init_copy(v, a);
- }
-
- u->sign = FP_ZPOS;
- v->sign = FP_ZPOS;
-
- fp_init(r);
- while (fp_iszero(v) == FP_NO) {
- fp_mod(u, v, r);
- fp_copy(v, u);
- fp_copy(r, v);
- }
- fp_copy(u, c);
-
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(u, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-#endif /* WOLFSSL_KEY_GEN */
-
-
-#if defined(HAVE_ECC) || !defined(NO_PWDBASED) || defined(OPENSSL_EXTRA) || \
- defined(WC_RSA_BLINDING) || !defined(NO_DSA) || \
- (!defined(NO_RSA) && !defined(NO_RSA_BOUNDS_CHECK))
-/* c = a + b */
-void fp_add_d(fp_int *a, fp_digit b, fp_int *c)
-{
-#ifndef WOLFSSL_SMALL_STACK
- fp_int tmp;
- fp_init(&tmp);
- fp_set(&tmp, b);
- fp_add(a, &tmp, c);
-#else
- int i;
- fp_word t = b;
-
- fp_copy(a, c);
- for (i = 0; t != 0 && i < FP_SIZE && i < c->used; i++) {
- t += c->dp[i];
- c->dp[i] = (fp_digit)t;
- t >>= DIGIT_BIT;
- }
- if (i == c->used && i < FP_SIZE && t != 0) {
- c->dp[i] = t;
- c->used++;
- }
-#endif
-}
-
-/* external compatibility */
-int mp_add_d(fp_int *a, fp_digit b, fp_int *c)
-{
- fp_add_d(a, b, c);
- return MP_OKAY;
-}
-
-#endif /* HAVE_ECC || !NO_PWDBASED || OPENSSL_EXTRA || WC_RSA_BLINDING ||
- !NO_DSA || (!NO_RSA && !NO_RSA_BOUNDS_CHECK) */
-
-
-#if !defined(NO_DSA) || defined(HAVE_ECC) || defined(WOLFSSL_KEY_GEN) || \
- defined(HAVE_COMP_KEY) || defined(WOLFSSL_DEBUG_MATH) || \
- defined(DEBUG_WOLFSSL) || defined(OPENSSL_EXTRA) || defined(WC_MP_TO_RADIX)
-
-/* chars used in radix conversions */
-static wcchar fp_s_rmap = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- "abcdefghijklmnopqrstuvwxyz+/";
-#endif
-
-#if !defined(NO_DSA) || defined(HAVE_ECC)
-#if DIGIT_BIT == 64 || DIGIT_BIT == 32
-static int fp_read_radix_16(fp_int *a, const char *str)
-{
- int i, j, k, neg;
- char ch;
-
- /* if the leading digit is a
- * minus set the sign to negative.
- */
- if (*str == '-') {
- ++str;
- neg = FP_NEG;
- } else {
- neg = FP_ZPOS;
- }
-
- j = 0;
- k = 0;
- for (i = (int)(XSTRLEN(str) - 1); i >= 0; i--) {
- ch = str[i];
- if (ch >= '0' && ch <= '9')
- ch -= '0';
- else if (ch >= 'A' && ch <= 'F')
- ch -= 'A' - 10;
- else if (ch >= 'a' && ch <= 'f')
- ch -= 'a' - 10;
- else
- return FP_VAL;
-
- a->dp[k] |= ((fp_digit)ch) << j;
- j += 4;
- k += j == DIGIT_BIT;
- j &= DIGIT_BIT - 1;
- }
-
- a->used = k + 1;
- fp_clamp(a);
- /* set the sign only if a != 0 */
- if (fp_iszero(a) != FP_YES) {
- a->sign = neg;
- }
- return FP_OKAY;
-}
-#endif
-
-static int fp_read_radix(fp_int *a, const char *str, int radix)
-{
- int y, neg;
- char ch;
-
- /* set the integer to the default of zero */
- fp_zero (a);
-
-#if DIGIT_BIT == 64 || DIGIT_BIT == 32
- if (radix == 16)
- return fp_read_radix_16(a, str);
-#endif
-
- /* make sure the radix is ok */
- if (radix < 2 || radix > 64) {
- return FP_VAL;
- }
-
- /* if the leading digit is a
- * minus set the sign to negative.
- */
- if (*str == '-') {
- ++str;
- neg = FP_NEG;
- } else {
- neg = FP_ZPOS;
- }
-
- /* process each digit of the string */
- while (*str) {
- /* if the radix <= 36 the conversion is case insensitive
- * this allows numbers like 1AB and 1ab to represent the same value
- * [e.g. in hex]
- */
- ch = (char)((radix <= 36) ? XTOUPPER((unsigned char)*str) : *str);
- for (y = 0; y < 64; y++) {
- if (ch == fp_s_rmap[y]) {
- break;
- }
- }
-
- /* if the char was found in the map
- * and is less than the given radix add it
- * to the number, otherwise exit the loop.
- */
- if (y < radix) {
- fp_mul_d (a, (fp_digit) radix, a);
- fp_add_d (a, (fp_digit) y, a);
- } else {
- break;
- }
- ++str;
- }
-
- /* set the sign only if a != 0 */
- if (fp_iszero(a) != FP_YES) {
- a->sign = neg;
- }
- return FP_OKAY;
-}
-
-/* fast math conversion */
-int mp_read_radix(mp_int *a, const char *str, int radix)
-{
- return fp_read_radix(a, str, radix);
-}
-
-#endif /* !defined(NO_DSA) || defined(HAVE_ECC) */
-
-#ifdef HAVE_ECC
-
-/* fast math conversion */
-int mp_sqr(fp_int *A, fp_int *B)
-{
- return fp_sqr(A, B);
-}
-
-/* fast math conversion */
-int mp_montgomery_reduce(fp_int *a, fp_int *m, fp_digit mp)
-{
- return fp_montgomery_reduce(a, m, mp);
-}
-
-
-/* fast math conversion */
-int mp_montgomery_setup(fp_int *a, fp_digit *rho)
-{
- return fp_montgomery_setup(a, rho);
-}
-
-int mp_div_2(fp_int * a, fp_int * b)
-{
- fp_div_2(a, b);
- return MP_OKAY;
-}
-
-
-int mp_init_copy(fp_int * a, fp_int * b)
-{
- fp_init_copy(a, b);
- return MP_OKAY;
-}
-
-#ifdef HAVE_COMP_KEY
-
-int mp_cnt_lsb(fp_int* a)
-{
- return fp_cnt_lsb(a);
-}
-
-#endif /* HAVE_COMP_KEY */
-
-#endif /* HAVE_ECC */
-
-#if defined(HAVE_ECC) || !defined(NO_RSA) || !defined(NO_DSA) || \
- defined(WOLFSSL_KEY_GEN)
-/* fast math conversion */
-int mp_set(fp_int *a, fp_digit b)
-{
- fp_set(a,b);
- return MP_OKAY;
-}
-#endif
-
-#ifdef WC_MP_TO_RADIX
-
-/* returns size of ASCII representation */
-int mp_radix_size (mp_int *a, int radix, int *size)
-{
- int res, digs;
- fp_digit d;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
- *size = 0;
-
- /* special case for binary */
- if (radix == 2) {
- *size = fp_count_bits (a) + (a->sign == FP_NEG ? 1 : 0) + 1;
- return FP_YES;
- }
-
- /* make sure the radix is in range */
- if (radix < 2 || radix > 64) {
- return FP_VAL;
- }
-
- if (fp_iszero(a) == MP_YES) {
- *size = 2;
- return FP_OKAY;
- }
-
- /* digs is the digit count */
- digs = 0;
-
- /* if it's negative add one for the sign */
- if (a->sign == FP_NEG) {
- ++digs;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- /* init a copy of the input */
- fp_init_copy (t, a);
-
- /* force temp to positive */
- t->sign = FP_ZPOS;
-
- /* fetch out all of the digits */
- while (fp_iszero (t) == FP_NO) {
- if ((res = fp_div_d (t, (mp_digit) radix, t, &d)) != FP_OKAY) {
- fp_zero (t);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return res;
- }
- ++digs;
- }
- fp_zero (t);
-
- /* return digs + 1, the 1 is for the NULL byte that would be required. */
- *size = digs + 1;
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-/* stores a bignum as a ASCII string in a given radix (2..64) */
-int mp_toradix (mp_int *a, char *str, int radix)
-{
- int res, digs;
- fp_digit d;
- char *_s = str;
-#ifndef WOLFSSL_SMALL_STACK
- fp_int t[1];
-#else
- fp_int *t;
-#endif
-
- /* check range of the radix */
- if (radix < 2 || radix > 64) {
- return FP_VAL;
- }
-
- /* quick out if its zero */
- if (fp_iszero(a) == FP_YES) {
- *str++ = '0';
- *str = '\0';
- return FP_OKAY;
- }
-
-#ifdef WOLFSSL_SMALL_STACK
- t = (fp_int*)XMALLOC(sizeof(fp_int), NULL, DYNAMIC_TYPE_BIGINT);
- if (t == NULL)
- return FP_MEM;
-#endif
-
- /* init a copy of the input */
- fp_init_copy (t, a);
-
- /* if it is negative output a - */
- if (t->sign == FP_NEG) {
- ++_s;
- *str++ = '-';
- t->sign = FP_ZPOS;
- }
-
- digs = 0;
- while (fp_iszero (t) == FP_NO) {
- if ((res = fp_div_d (t, (fp_digit) radix, t, &d)) != FP_OKAY) {
- fp_zero (t);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
- #endif
- return res;
- }
- *str++ = fp_s_rmap[d];
- ++digs;
- }
-#ifndef WC_DISABLE_RADIX_ZERO_PAD
- /* For hexadecimal output, add zero padding when number of digits is odd */
- if ((digs & 1) && (radix == 16)) {
- *str++ = fp_s_rmap[0];
- ++digs;
- }
-#endif
- /* reverse the digits of the string. In this case _s points
- * to the first digit [excluding the sign] of the number]
- */
- fp_reverse ((unsigned char *)_s, digs);
-
- /* append a NULL so the string is properly terminated */
- *str = '\0';
-
- fp_zero (t);
-#ifdef WOLFSSL_SMALL_STACK
- XFREE(t, NULL, DYNAMIC_TYPE_BIGINT);
-#endif
- return FP_OKAY;
-}
-
-#ifdef WOLFSSL_DEBUG_MATH
-void mp_dump(const char* desc, mp_int* a, byte verbose)
-{
- char buffer[FP_SIZE * sizeof(fp_digit) * 2];
- int size;
-
-#if defined(ALT_ECC_SIZE) || defined(HAVE_WOLF_BIGINT)
- size = a->size;
-#else
- size = FP_SIZE;
-#endif
-
- printf("%s: ptr=%p, used=%d, sign=%d, size=%d, fpd=%d\n",
- desc, a, a->used, a->sign, size, (int)sizeof(fp_digit));
-
- mp_tohex(a, buffer);
- printf(" %s\n ", buffer);
-
- if (verbose) {
- int i;
- for(i=0; i<size * (int)sizeof(fp_digit); i++) {
- printf("%x ", *(((byte*)a->dp) + i));
- }
- printf("\n");
- }
-}
-#endif /* WOLFSSL_DEBUG_MATH */
-
-#endif /* WC_MP_TO_RADIX */
-
-
-int mp_abs(mp_int* a, mp_int* b)
-{
- fp_abs(a, b);
- return FP_OKAY;
-}
-
-
-int mp_lshd (mp_int * a, int b)
-{
- fp_lshd(a, b);
- return FP_OKAY;
-}
-
-#endif /* USE_FAST_MATH */
generated by cgit v1.2.3 (git 2.25.1) at 2026-04-16 06:54:39 +0000