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