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/* devcrypto_hash.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>
#if defined(WOLFSSL_DEVCRYPTO_HASH)
#include <wolfssl/wolfcrypt/error-crypt.h>
#include <wolfssl/wolfcrypt/logging.h>
#include <wolfssl/wolfcrypt/port/devcrypto/wc_devcrypto.h>
#if !defined(NO_SHA256)
#include <wolfssl/wolfcrypt/sha256.h>
#endif
/* dereference structure based on type to get cryptodev context pointer
* can return NULL on fail case */
static WC_CRYPTODEV* GetHashContext(void* ctx, int type)
{
switch (type) {
case CRYPTO_SHA2_256:
return &((wc_Sha256*)ctx)->ctx;
default:
return NULL;
}
return NULL;
}
/* generic hash initialization
* key is for hmac algorithms and keySz is for the size of key buffer
* key should be null in the case of non hmac algorithms
* return 0 on success */
static int HashInit(void* ctx, int type, byte* key, word32 keySz)
{
WC_CRYPTODEV* cdev;
if ((cdev = GetHashContext(ctx, type)) == NULL) {
WOLFSSL_MSG("Unsupported hash type");
return BAD_FUNC_ARG;
}
return wc_DevCryptoCreate(cdev, type, key, keySz);
}
/* generic function for updated hash structure
* returns 0 on success */
static int HashUpdate(void* ctx, int type, const byte* input, word32 inputSz)
{
WC_CRYPTODEV* dev;
struct crypt_op crt;
byte digest[64];
if (inputSz == 0) {
return 0;
}
if ((dev = GetHashContext(ctx, type)) == NULL) {
WOLFSSL_MSG("Unsupported hash type");
return BAD_FUNC_ARG;
}
wc_SetupCrypt(&crt, dev, (byte*)input, inputSz, NULL, digest, COP_FLAG_UPDATE);
if (ioctl(dev->cfd, CIOCCRYPT, &crt)) {
WOLFSSL_MSG("Error with call to ioctl");
return WC_DEVCRYPTO_E;
}
return 0;
}
/* generic function for getting final digest value */
static int GetDigest(void* ctx, int type, byte* out)
{
WC_CRYPTODEV* dev;
struct crypt_op crt;
if ((dev = GetHashContext(ctx, type)) == NULL) {
WOLFSSL_MSG("Unsupported hash type");
return BAD_FUNC_ARG;
}
wc_SetupCrypt(&crt, dev, NULL, 0, NULL, out, COP_FLAG_FINAL);
if (ioctl(dev->cfd, CIOCCRYPT, &crt)) {
WOLFSSL_MSG("Error with call to ioctl");
return WC_DEVCRYPTO_E;
}
return 0;
}
#if !defined(NO_SHA256)
int wc_InitSha256_ex(wc_Sha256* sha, void* heap, int devId)
{
if (sha == NULL) {
return BAD_FUNC_ARG;
}
(void)devId; /* no async for now */
XMEMSET(sha, 0, sizeof(wc_Sha256));
sha->heap = heap;
return HashInit((void*)sha, CRYPTO_SHA2_256, NULL, 0);
}
int wc_Sha256Update(wc_Sha256* sha, const byte* in, word32 sz)
{
if (sha == NULL || (sz > 0 && in == NULL)) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_DEVCRYPTO_HASH_KEEP
/* keep full message to hash at end instead of incremental updates */
if (sha->len < sha->used + sz) {
if (sha->msg == NULL) {
sha->msg = (byte*)XMALLOC(sha->used + sz, sha->heap,
DYNAMIC_TYPE_TMP_BUFFER);
} else {
byte* pt = (byte*)XREALLOC(sha->msg, sha->used + sz, sha->heap,
DYNAMIC_TYPE_TMP_BUFFER);
if (pt == NULL) {
return MEMORY_E;
}
sha->msg = pt;
}
if (sha->msg == NULL) {
return MEMORY_E;
}
sha->len = sha->used + sz;
}
XMEMCPY(sha->msg + sha->used, in, sz);
sha->used += sz;
return 0;
#else
return HashUpdate(sha, CRYPTO_SHA2_256, in, sz);
#endif
}
int wc_Sha256Final(wc_Sha256* sha, byte* hash)
{
int ret;
if (sha == NULL || hash == NULL) {
return BAD_FUNC_ARG;
}
/* help static analysis tools out */
XMEMSET(hash, 0, WC_SHA256_DIGEST_SIZE);
#ifdef WOLFSSL_DEVCRYPTO_HASH_KEEP
/* keep full message to hash at end instead of incremental updates */
if ((ret = HashUpdate(sha, CRYPTO_SHA2_256, sha->msg, sha->used)) < 0) {
return ret;
}
XFREE(sha->msg, sha->heap, DYNAMIC_TYPE_TMP_BUFFER);
sha->msg = NULL;
#endif
ret = GetDigest(sha, CRYPTO_SHA2_256, hash);
if (ret != 0) {
return ret;
}
wc_Sha256Free(sha);
return wc_InitSha256_ex(sha, sha->heap, 0);
}
int wc_Sha256GetHash(wc_Sha256* sha, byte* hash)
{
if (sha == NULL || hash == NULL) {
return BAD_FUNC_ARG;
}
#ifdef WOLFSSL_DEVCRYPTO_HASH_KEEP
{
int ret;
wc_Sha256 cpy;
wc_Sha256Copy(sha, &cpy);
if ((ret = HashUpdate(&cpy, CRYPTO_SHA2_256, cpy.msg, cpy.used)) == 0) {
/* help static analysis tools out */
XMEMSET(hash, 0, WC_SHA256_DIGEST_SIZE);
ret = GetDigest(&cpy, CRYPTO_SHA2_256, hash);
}
wc_Sha256Free(&cpy);
return ret;
}
#else
(void)sha;
(void)hash;
WOLFSSL_MSG("Compile with WOLFSSL_DEVCRYPTO_HASH_KEEP for this feature");
return NOT_COMPILED_IN;
#endif
}
int wc_Sha256Copy(wc_Sha256* src, wc_Sha256* dst)
{
if (src == NULL || dst == NULL) {
return BAD_FUNC_ARG;
}
wc_InitSha256_ex(dst, src->heap, 0);
#ifdef WOLFSSL_DEVCRYPTO_HASH_KEEP
dst->len = src->len;
dst->used = src->used;
dst->msg = (byte*)XMALLOC(src->len, dst->heap, DYNAMIC_TYPE_TMP_BUFFER);
if (dst->msg == NULL) {
return MEMORY_E;
}
XMEMCPY(dst->msg, src->msg, src->len);
#endif
return 0;
}
#endif /* !NO_SHA256 */
#endif /* WOLFSSL_DEVCRYPTO */
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