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Diffstat (limited to 'crypto/hmac/hmac.c')
| -rw-r--r-- | crypto/hmac/hmac.c | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/crypto/hmac/hmac.c b/crypto/hmac/hmac.c new file mode 100644 index 0000000000..fb09129963 --- /dev/null +++ b/crypto/hmac/hmac.c @@ -0,0 +1,165 @@ +/* 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 "hmac.h" + +void HMAC_Init(ctx,key,len,md) +HMAC_CTX *ctx; +unsigned char *key; +int len; +EVP_MD *md; + { + int i,j,reset=0; + unsigned char pad[HMAC_MAX_MD_CBLOCK]; + + if (md != NULL) + { + reset=1; + ctx->md=md; + } + else + md=ctx->md; + + if (key != NULL) + { + reset=1; + j=EVP_MD_block_size(md); + if (j < len) + { + EVP_DigestInit(&ctx->md_ctx,md); + EVP_DigestUpdate(&ctx->md_ctx,key,len); + EVP_DigestFinal(&(ctx->md_ctx),ctx->key, + &ctx->key_length); + } + else + { + memcpy(ctx->key,key,len); + memset(&(ctx->key[len]),0,sizeof(ctx->key)-len); + ctx->key_length=len; + } + } + + if (reset) + { + for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) + pad[i]=0x36^ctx->key[i]; + EVP_DigestInit(&ctx->i_ctx,md); + EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md)); + + for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) + pad[i]=0x5c^ctx->key[i]; + EVP_DigestInit(&ctx->o_ctx,md); + EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md)); + } + + memcpy(&ctx->md_ctx,&ctx->i_ctx,sizeof(ctx->i_ctx)); + } + +void HMAC_Update(ctx,data,len) +HMAC_CTX *ctx; +unsigned char *data; +int len; + { + EVP_DigestUpdate(&(ctx->md_ctx),data,len); + } + +void HMAC_Final(ctx,md,len) +HMAC_CTX *ctx; +unsigned char *md; +unsigned int *len; + { + int j; + unsigned int i; + unsigned char buf[EVP_MAX_MD_SIZE]; + + j=EVP_MD_block_size(ctx->md); + + EVP_DigestFinal(&(ctx->md_ctx),buf,&i); + memcpy(&(ctx->md_ctx),&(ctx->o_ctx),sizeof(ctx->o_ctx)); + EVP_DigestUpdate(&(ctx->md_ctx),buf,i); + EVP_DigestFinal(&(ctx->md_ctx),md,len); + } + +void HMAC_cleanup(ctx) +HMAC_CTX *ctx; + { + memset(ctx,0,sizeof(HMAC_CTX)); + } + +unsigned char *HMAC(evp_md,key,key_len,d,n,md,md_len) +EVP_MD *evp_md; +unsigned char *key; +int key_len; +unsigned char *d; +int 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_Init(&c,key,key_len,evp_md); + HMAC_Update(&c,d,n); + HMAC_Final(&c,md,md_len); + HMAC_cleanup(&c); + return(md); + } + |