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1 files changed, 405 insertions, 0 deletions

diff --git a/wolfcrypt/src/misc.c b/wolfcrypt/src/misc.c
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+/* misc.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
+ */
+
+
+#ifdef HAVE_CONFIG_H
+    #include <config.h>
+#endif
+
+#include <wolfssl/wolfcrypt/settings.h>
+
+#ifndef WOLF_CRYPT_MISC_C
+#define WOLF_CRYPT_MISC_C
+
+#include <wolfssl/wolfcrypt/misc.h>
+
+/* inlining these functions is a huge speed increase and a small size decrease,
+   because the functions are smaller than function call setup/cleanup, e.g.,
+   md5 benchmark is twice as fast with inline.  If you don't want it, then
+   define NO_INLINE and compile this file into wolfssl, otherwise it's used as
+   a source header
+ */
+
+#ifdef NO_INLINE
+    #define WC_STATIC
+#else
+    #define WC_STATIC static
+#endif
+
+/* Check for if compiling misc.c when not needed. */
+#if !defined(WOLFSSL_MISC_INCLUDED) && !defined(NO_INLINE)
+    #ifndef WOLFSSL_IGNORE_FILE_WARN
+        #warning misc.c does not need to be compiled when using inline (NO_INLINE not defined)
+    #endif
+
+#else
+
+
+#if defined(__ICCARM__)
+    #include <intrinsics.h>
+#endif
+
+
+#ifdef INTEL_INTRINSICS
+
+    #include <stdlib.h>      /* get intrinsic definitions */
+
+    /* for non visual studio probably need no long version, 32 bit only
+     * i.e., _rotl and _rotr */
+    #pragma intrinsic(_lrotl, _lrotr)
+
+    WC_STATIC WC_INLINE word32 rotlFixed(word32 x, word32 y)
+    {
+        return y ? _lrotl(x, y) : x;
+    }
+
+    WC_STATIC WC_INLINE word32 rotrFixed(word32 x, word32 y)
+    {
+        return y ? _lrotr(x, y) : x;
+    }
+
+#else /* generic */
+
+    WC_STATIC WC_INLINE word32 rotlFixed(word32 x, word32 y)
+    {
+        return (x << y) | (x >> (sizeof(y) * 8 - y));
+    }
+
+
+    WC_STATIC WC_INLINE word32 rotrFixed(word32 x, word32 y)
+    {
+        return (x >> y) | (x << (sizeof(y) * 8 - y));
+    }
+
+#endif
+
+
+WC_STATIC WC_INLINE word32 ByteReverseWord32(word32 value)
+{
+#ifdef PPC_INTRINSICS
+    /* PPC: load reverse indexed instruction */
+    return (word32)__lwbrx(&value,0);
+#elif defined(__ICCARM__)
+    return (word32)__REV(value);
+#elif defined(KEIL_INTRINSICS)
+    return (word32)__rev(value);
+#elif defined(WOLF_ALLOW_BUILTIN) && \
+        defined(__GNUC_PREREQ) && __GNUC_PREREQ(4, 3)
+    return (word32)__builtin_bswap32(value);
+#elif defined(FAST_ROTATE)
+    /* 5 instructions with rotate instruction, 9 without */
+    return (rotrFixed(value, 8U) & 0xff00ff00) |
+           (rotlFixed(value, 8U) & 0x00ff00ff);
+#else
+    /* 6 instructions with rotate instruction, 8 without */
+    value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
+    return rotlFixed(value, 16U);
+#endif
+}
+
+
+WC_STATIC WC_INLINE void ByteReverseWords(word32* out, const word32* in,
+                                    word32 byteCount)
+{
+    word32 count = byteCount/(word32)sizeof(word32), i;
+
+    for (i = 0; i < count; i++)
+        out[i] = ByteReverseWord32(in[i]);
+
+}
+
+
+#if defined(WORD64_AVAILABLE) && !defined(WOLFSSL_NO_WORD64_OPS)
+
+
+WC_STATIC WC_INLINE word64 rotlFixed64(word64 x, word64 y)
+{
+    return (x << y) | (x >> (sizeof(y) * 8 - y));
+}
+
+
+WC_STATIC WC_INLINE word64 rotrFixed64(word64 x, word64 y)
+{
+    return (x >> y) | (x << (sizeof(y) * 8 - y));
+}
+
+
+WC_STATIC WC_INLINE word64 ByteReverseWord64(word64 value)
+{
+#if defined(WOLF_ALLOW_BUILTIN) && defined(__GNUC_PREREQ) && __GNUC_PREREQ(4, 3)
+    return (word64)__builtin_bswap64(value);
+#elif defined(WOLFCRYPT_SLOW_WORD64)
+	return (word64)((word64)ByteReverseWord32((word32) value)) << 32 |
+                    (word64)ByteReverseWord32((word32)(value   >> 32));
+#else
+	value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) |
+            ((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
+	value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) |
+            ((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
+	return rotlFixed64(value, 32U);
+#endif
+}
+
+
+WC_STATIC WC_INLINE void ByteReverseWords64(word64* out, const word64* in,
+                                      word32 byteCount)
+{
+    word32 count = byteCount/(word32)sizeof(word64), i;
+
+    for (i = 0; i < count; i++)
+        out[i] = ByteReverseWord64(in[i]);
+
+}
+
+#endif /* WORD64_AVAILABLE && !WOLFSSL_NO_WORD64_OPS */
+
+#ifndef WOLFSSL_NO_XOR_OPS
+WC_STATIC WC_INLINE void XorWords(wolfssl_word* r, const wolfssl_word* a, word32 n)
+{
+    word32 i;
+
+    for (i = 0; i < n; i++) r[i] ^= a[i];
+}
+
+
+WC_STATIC WC_INLINE void xorbuf(void* buf, const void* mask, word32 count)
+{
+    if (((wolfssl_word)buf | (wolfssl_word)mask | count) % WOLFSSL_WORD_SIZE == 0)
+        XorWords( (wolfssl_word*)buf,
+                  (const wolfssl_word*)mask, count / WOLFSSL_WORD_SIZE);
+    else {
+        word32 i;
+        byte*       b = (byte*)buf;
+        const byte* m = (const byte*)mask;
+
+        for (i = 0; i < count; i++) b[i] ^= m[i];
+    }
+}
+#endif
+
+#ifndef WOLFSSL_NO_FORCE_ZERO
+/* Make sure compiler doesn't skip */
+WC_STATIC WC_INLINE void ForceZero(const void* mem, word32 len)
+{
+    volatile byte* z = (volatile byte*)mem;
+
+#if defined(WOLFSSL_X86_64_BUILD) && defined(WORD64_AVAILABLE)
+    volatile word64* w;
+    #ifndef WOLFSSL_UNALIGNED_64BIT_ACCESS
+        word32 l = (sizeof(word64) - ((size_t)z & (sizeof(word64)-1))) &
+                                                             (sizeof(word64)-1);
+
+        if (len < l) l = len;
+        len -= l;
+        while (l--) *z++ = 0;
+    #endif
+    for (w = (volatile word64*)z; len >= sizeof(*w); len -= sizeof(*w))
+        *w++ = 0;
+    z = (volatile byte*)w;
+#endif
+
+    while (len--) *z++ = 0;
+}
+#endif
+
+
+#ifndef WOLFSSL_NO_CONST_CMP
+/* check all length bytes for equality, return 0 on success */
+WC_STATIC WC_INLINE int ConstantCompare(const byte* a, const byte* b, int length)
+{
+    int i;
+    int compareSum = 0;
+
+    for (i = 0; i < length; i++) {
+        compareSum |= a[i] ^ b[i];
+    }
+
+    return compareSum;
+}
+#endif
+
+
+#ifndef WOLFSSL_HAVE_MIN
+    #define WOLFSSL_HAVE_MIN
+    #if defined(HAVE_FIPS) && !defined(min) /* so ifdef check passes */
+        #define min min
+    #endif
+    WC_STATIC WC_INLINE word32 min(word32 a, word32 b)
+    {
+        return a > b ? b : a;
+    }
+#endif /* !WOLFSSL_HAVE_MIN */
+
+#ifndef WOLFSSL_HAVE_MAX
+    #define WOLFSSL_HAVE_MAX
+    #if defined(HAVE_FIPS) && !defined(max) /* so ifdef check passes */
+        #define max max
+    #endif
+    WC_STATIC WC_INLINE word32 max(word32 a, word32 b)
+    {
+        return a > b ? a : b;
+    }
+#endif /* !WOLFSSL_HAVE_MAX */
+
+#ifndef WOLFSSL_NO_INT_ENCODE
+/* converts a 32 bit integer to 24 bit */
+WC_STATIC WC_INLINE void c32to24(word32 in, word24 out)
+{
+    out[0] = (in >> 16) & 0xff;
+    out[1] = (in >>  8) & 0xff;
+    out[2] =  in & 0xff;
+}
+
+/* convert 16 bit integer to opaque */
+WC_STATIC WC_INLINE void c16toa(word16 wc_u16, byte* c)
+{
+    c[0] = (wc_u16 >> 8) & 0xff;
+    c[1] =  wc_u16 & 0xff;
+}
+
+/* convert 32 bit integer to opaque */
+WC_STATIC WC_INLINE void c32toa(word32 wc_u32, byte* c)
+{
+    c[0] = (wc_u32 >> 24) & 0xff;
+    c[1] = (wc_u32 >> 16) & 0xff;
+    c[2] = (wc_u32 >>  8) & 0xff;
+    c[3] =  wc_u32 & 0xff;
+}
+#endif
+
+#ifndef WOLFSSL_NO_INT_DECODE
+/* convert a 24 bit integer into a 32 bit one */
+WC_STATIC WC_INLINE void c24to32(const word24 wc_u24, word32* wc_u32)
+{
+    *wc_u32 = ((word32)wc_u24[0] << 16) | (wc_u24[1] << 8) | wc_u24[2];
+}
+
+
+/* convert opaque to 24 bit integer */
+WC_STATIC WC_INLINE void ato24(const byte* c, word32* wc_u24)
+{
+    *wc_u24 = ((word32)c[0] << 16) | (c[1] << 8) | c[2];
+}
+
+/* convert opaque to 16 bit integer */
+WC_STATIC WC_INLINE void ato16(const byte* c, word16* wc_u16)
+{
+    *wc_u16 = (word16) ((c[0] << 8) | (c[1]));
+}
+
+/* convert opaque to 32 bit integer */
+WC_STATIC WC_INLINE void ato32(const byte* c, word32* wc_u32)
+{
+    *wc_u32 = ((word32)c[0] << 24) | ((word32)c[1] << 16) | (c[2] << 8) | c[3];
+}
+
+
+WC_STATIC WC_INLINE word32 btoi(byte b)
+{
+    return (word32)(b - 0x30);
+}
+#endif
+
+
+#ifndef WOLFSSL_NO_CT_OPS
+/* Constant time - mask set when a > b. */
+WC_STATIC WC_INLINE byte ctMaskGT(int a, int b)
+{
+    return (((word32)a - b - 1) >> 31) - 1;
+}
+
+/* Constant time - mask set when a >= b. */
+WC_STATIC WC_INLINE byte ctMaskGTE(int a, int b)
+{
+    return (((word32)a - b    ) >> 31) - 1;
+}
+
+/* Constant time - mask set when a >= b. */
+WC_STATIC WC_INLINE int ctMaskIntGTE(int a, int b)
+{
+    return (((word32)a - b    ) >> 31) - 1;
+}
+
+/* Constant time - mask set when a < b. */
+WC_STATIC WC_INLINE byte ctMaskLT(int a, int b)
+{
+    return (((word32)b - a - 1) >> 31) - 1;
+}
+
+/* Constant time - mask set when a <= b. */
+WC_STATIC WC_INLINE byte ctMaskLTE(int a, int b)
+{
+    return (((word32)b - a    ) >> 31) - 1;
+}
+
+/* Constant time - mask set when a == b. */
+WC_STATIC WC_INLINE byte ctMaskEq(int a, int b)
+{
+    return (~ctMaskGT(a, b)) & (~ctMaskLT(a, b));
+}
+
+WC_STATIC WC_INLINE word16 ctMask16GT(int a, int b)
+{
+    return (((word32)a - b - 1) >> 31) - 1;
+}
+
+WC_STATIC WC_INLINE word16 ctMask16LT(int a, int b)
+{
+    return (((word32)a - b - 1) >> 31) - 1;
+}
+
+WC_STATIC WC_INLINE word16 ctMask16Eq(int a, int b)
+{
+    return (~ctMask16GT(a, b)) & (~ctMask16LT(a, b));
+}
+
+/* Constant time - mask set when a != b. */
+WC_STATIC WC_INLINE byte ctMaskNotEq(int a, int b)
+{
+    return ctMaskGT(a, b) | ctMaskLT(a, b);
+}
+
+/* Constant time - select a when mask is set and b otherwise. */
+WC_STATIC WC_INLINE byte ctMaskSel(byte m, byte a, byte b)
+{
+    return (b & ((byte)~(word32)m)) | (a & m);
+}
+
+/* Constant time - select integer a when mask is set and integer b otherwise. */
+WC_STATIC WC_INLINE int ctMaskSelInt(byte m, int a, int b)
+{
+    return (b & (~(signed int)(signed char)m)) |
+           (a & ( (signed int)(signed char)m));
+}
+
+/* Constant time - bit set when a <= b. */
+WC_STATIC WC_INLINE byte ctSetLTE(int a, int b)
+{
+    return ((word32)a - b - 1) >> 31;
+}
+#endif
+
+
+#undef WC_STATIC
+
+#endif /* !WOLFSSL_MISC_INCLUDED && !NO_INLINE */
+
+#endif /* WOLF_CRYPT_MISC_C */