You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
258 lines
8.4 KiB
258 lines
8.4 KiB
/* crypto/hmac/hmac.c */ |
|
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
|
* All rights reserved. |
|
* |
|
* This package is an SSL implementation written |
|
* by Eric Young (eay@cryptsoft.com). |
|
* The implementation was written so as to conform with Netscapes SSL. |
|
* |
|
* This library is free for commercial and non-commercial use as long as |
|
* the following conditions are aheared to. The following conditions |
|
* apply to all code found in this distribution, be it the RC4, RSA, |
|
* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
|
* included with this distribution is covered by the same copyright terms |
|
* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
|
* |
|
* Copyright remains Eric Young's, and as such any Copyright notices in |
|
* the code are not to be removed. |
|
* If this package is used in a product, Eric Young should be given attribution |
|
* as the author of the parts of the library used. |
|
* This can be in the form of a textual message at program startup or |
|
* in documentation (online or textual) provided with the package. |
|
* |
|
* Redistribution and use in source and binary forms, with or without |
|
* modification, are permitted provided that the following conditions |
|
* are met: |
|
* 1. Redistributions of source code must retain the copyright |
|
* notice, this list of conditions and the following disclaimer. |
|
* 2. Redistributions in binary form must reproduce the above copyright |
|
* notice, this list of conditions and the following disclaimer in the |
|
* documentation and/or other materials provided with the distribution. |
|
* 3. All advertising materials mentioning features or use of this software |
|
* must display the following acknowledgement: |
|
* "This product includes cryptographic software written by |
|
* Eric Young (eay@cryptsoft.com)" |
|
* The word 'cryptographic' can be left out if the rouines from the library |
|
* being used are not cryptographic related :-). |
|
* 4. If you include any Windows specific code (or a derivative thereof) from |
|
* the apps directory (application code) you must include an acknowledgement: |
|
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
|
* |
|
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
|
* SUCH DAMAGE. |
|
* |
|
* The licence and distribution terms for any publically available version or |
|
* derivative of this code cannot be changed. i.e. this code cannot simply be |
|
* copied and put under another distribution licence |
|
* [including the GNU Public Licence.] |
|
*/ |
|
#include <stdio.h> |
|
#include <stdlib.h> |
|
#include <string.h> |
|
#include "cryptlib.h" |
|
#include <openssl/hmac.h> |
|
|
|
#ifdef OPENSSL_FIPS |
|
# include <openssl/fips.h> |
|
#endif |
|
|
|
int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, |
|
const EVP_MD *md, ENGINE *impl) |
|
{ |
|
int i, j, reset = 0; |
|
unsigned char pad[HMAC_MAX_MD_CBLOCK]; |
|
|
|
#ifdef OPENSSL_FIPS |
|
if (FIPS_mode()) { |
|
/* If we have an ENGINE need to allow non FIPS */ |
|
if ((impl || ctx->i_ctx.engine) |
|
&& !(ctx->i_ctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) { |
|
EVPerr(EVP_F_HMAC_INIT_EX, EVP_R_DISABLED_FOR_FIPS); |
|
return 0; |
|
} |
|
/* |
|
* Other algorithm blocking will be done in FIPS_cmac_init, via |
|
* FIPS_hmac_init_ex(). |
|
*/ |
|
if (!impl && !ctx->i_ctx.engine) |
|
return FIPS_hmac_init_ex(ctx, key, len, md, NULL); |
|
} |
|
#endif |
|
/* If we are changing MD then we must have a key */ |
|
if (md != NULL && md != ctx->md && (key == NULL || len < 0)) |
|
return 0; |
|
|
|
if (md != NULL) { |
|
reset = 1; |
|
ctx->md = md; |
|
} else if (ctx->md) { |
|
md = ctx->md; |
|
} else { |
|
return 0; |
|
} |
|
|
|
if (key != NULL) { |
|
reset = 1; |
|
j = EVP_MD_block_size(md); |
|
OPENSSL_assert(j <= (int)sizeof(ctx->key)); |
|
if (j < len) { |
|
if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl)) |
|
goto err; |
|
if (!EVP_DigestUpdate(&ctx->md_ctx, key, len)) |
|
goto err; |
|
if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key, |
|
&ctx->key_length)) |
|
goto err; |
|
} else { |
|
if (len < 0 || len > (int)sizeof(ctx->key)) |
|
return 0; |
|
memcpy(ctx->key, key, len); |
|
ctx->key_length = len; |
|
} |
|
if (ctx->key_length != HMAC_MAX_MD_CBLOCK) |
|
memset(&ctx->key[ctx->key_length], 0, |
|
HMAC_MAX_MD_CBLOCK - ctx->key_length); |
|
} |
|
|
|
if (reset) { |
|
for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) |
|
pad[i] = 0x36 ^ ctx->key[i]; |
|
if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl)) |
|
goto err; |
|
if (!EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md))) |
|
goto err; |
|
|
|
for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) |
|
pad[i] = 0x5c ^ ctx->key[i]; |
|
if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl)) |
|
goto err; |
|
if (!EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md))) |
|
goto err; |
|
} |
|
if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx)) |
|
goto err; |
|
return 1; |
|
err: |
|
return 0; |
|
} |
|
|
|
int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) |
|
{ |
|
if (key && md) |
|
HMAC_CTX_init(ctx); |
|
return HMAC_Init_ex(ctx, key, len, md, NULL); |
|
} |
|
|
|
int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) |
|
{ |
|
#ifdef OPENSSL_FIPS |
|
if (FIPS_mode() && !ctx->i_ctx.engine) |
|
return FIPS_hmac_update(ctx, data, len); |
|
#endif |
|
if (!ctx->md) |
|
return 0; |
|
|
|
return EVP_DigestUpdate(&ctx->md_ctx, data, len); |
|
} |
|
|
|
int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) |
|
{ |
|
unsigned int i; |
|
unsigned char buf[EVP_MAX_MD_SIZE]; |
|
#ifdef OPENSSL_FIPS |
|
if (FIPS_mode() && !ctx->i_ctx.engine) |
|
return FIPS_hmac_final(ctx, md, len); |
|
#endif |
|
|
|
if (!ctx->md) |
|
goto err; |
|
|
|
if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i)) |
|
goto err; |
|
if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx)) |
|
goto err; |
|
if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i)) |
|
goto err; |
|
if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len)) |
|
goto err; |
|
return 1; |
|
err: |
|
return 0; |
|
} |
|
|
|
void HMAC_CTX_init(HMAC_CTX *ctx) |
|
{ |
|
EVP_MD_CTX_init(&ctx->i_ctx); |
|
EVP_MD_CTX_init(&ctx->o_ctx); |
|
EVP_MD_CTX_init(&ctx->md_ctx); |
|
ctx->md = NULL; |
|
} |
|
|
|
int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) |
|
{ |
|
if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx)) |
|
goto err; |
|
if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx)) |
|
goto err; |
|
if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx)) |
|
goto err; |
|
memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); |
|
dctx->key_length = sctx->key_length; |
|
dctx->md = sctx->md; |
|
return 1; |
|
err: |
|
return 0; |
|
} |
|
|
|
void HMAC_CTX_cleanup(HMAC_CTX *ctx) |
|
{ |
|
#ifdef OPENSSL_FIPS |
|
if (FIPS_mode() && !ctx->i_ctx.engine) { |
|
FIPS_hmac_ctx_cleanup(ctx); |
|
return; |
|
} |
|
#endif |
|
EVP_MD_CTX_cleanup(&ctx->i_ctx); |
|
EVP_MD_CTX_cleanup(&ctx->o_ctx); |
|
EVP_MD_CTX_cleanup(&ctx->md_ctx); |
|
memset(ctx, 0, sizeof *ctx); |
|
} |
|
|
|
unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, |
|
const unsigned char *d, size_t n, unsigned char *md, |
|
unsigned int *md_len) |
|
{ |
|
HMAC_CTX c; |
|
static unsigned char m[EVP_MAX_MD_SIZE]; |
|
|
|
if (md == NULL) |
|
md = m; |
|
HMAC_CTX_init(&c); |
|
if (!HMAC_Init(&c, key, key_len, evp_md)) |
|
goto err; |
|
if (!HMAC_Update(&c, d, n)) |
|
goto err; |
|
if (!HMAC_Final(&c, md, md_len)) |
|
goto err; |
|
HMAC_CTX_cleanup(&c); |
|
return md; |
|
err: |
|
HMAC_CTX_cleanup(&c); |
|
return NULL; |
|
} |
|
|
|
void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) |
|
{ |
|
EVP_MD_CTX_set_flags(&ctx->i_ctx, flags); |
|
EVP_MD_CTX_set_flags(&ctx->o_ctx, flags); |
|
EVP_MD_CTX_set_flags(&ctx->md_ctx, flags); |
|
}
|
|
|