277 lines
7.4 KiB
C
277 lines
7.4 KiB
C
|
/* $OpenBSD: hmac.c,v 1.25 2018/02/17 14:53:58 jsing Exp $ */
|
||
|
|
/* 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 <openssl/err.h>
|
||
|
|
#include <openssl/hmac.h>
|
||
|
|
|
||
|
|
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];
|
||
|
|
|
||
|
|
/* 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 != NULL)
|
||
|
|
md = ctx->md;
|
||
|
|
else
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (key != NULL) {
|
||
|
|
reset = 1;
|
||
|
|
j = EVP_MD_block_size(md);
|
||
|
|
if ((size_t)j > sizeof(ctx->key)) {
|
||
|
|
EVPerror(EVP_R_BAD_BLOCK_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
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 || (size_t)len > sizeof(ctx->key)) {
|
||
|
|
EVPerror(EVP_R_BAD_KEY_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
if (ctx->md == NULL)
|
||
|
|
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];
|
||
|
|
|
||
|
|
if (ctx->md == NULL)
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
HMAC_CTX *
|
||
|
|
HMAC_CTX_new(void)
|
||
|
|
{
|
||
|
|
HMAC_CTX *ctx;
|
||
|
|
|
||
|
|
if ((ctx = calloc(1, sizeof(*ctx))) == NULL)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
HMAC_CTX_init(ctx);
|
||
|
|
|
||
|
|
return ctx;
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
HMAC_CTX_free(HMAC_CTX *ctx)
|
||
|
|
{
|
||
|
|
if (ctx == NULL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
HMAC_CTX_cleanup(ctx);
|
||
|
|
|
||
|
|
free(ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
HMAC_CTX_reset(HMAC_CTX *ctx)
|
||
|
|
{
|
||
|
|
HMAC_CTX_cleanup(ctx);
|
||
|
|
HMAC_CTX_init(ctx);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
EVP_MD_CTX_cleanup(&ctx->i_ctx);
|
||
|
|
EVP_MD_CTX_cleanup(&ctx->o_ctx);
|
||
|
|
EVP_MD_CTX_cleanup(&ctx->md_ctx);
|
||
|
|
explicit_bzero(ctx, sizeof(*ctx));
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
const EVP_MD *
|
||
|
|
HMAC_CTX_get_md(const HMAC_CTX *ctx)
|
||
|
|
{
|
||
|
|
return ctx->md;
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|