/* 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 <openssl/hmac.h> #include "cryptlib.h" void 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 (md != NULL) { reset=1; ctx->md=md; } else md=ctx->md; if (key != NULL) { reset=1; j=EVP_MD_block_size(md); OPENSSL_assert(j <= sizeof ctx->key); if (j < len) { EVP_DigestInit_ex(&ctx->md_ctx,md, impl); EVP_DigestUpdate(&ctx->md_ctx,key,len); EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key, &ctx->key_length); } else { OPENSSL_assert(len <= sizeof ctx->key); 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]; EVP_DigestInit_ex(&ctx->i_ctx,md, impl); 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_ex(&ctx->o_ctx,md, impl); EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md)); } EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx); } void HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) { if(key && md) HMAC_CTX_init(ctx); HMAC_Init_ex(ctx,key,len,md, NULL); } void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len) { EVP_DigestUpdate(&ctx->md_ctx,data,len); } void HMAC_Final(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_ex(&ctx->md_ctx,buf,&i); EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx); EVP_DigestUpdate(&ctx->md_ctx,buf,i); EVP_DigestFinal_ex(&ctx->md_ctx,md,len); } 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); } 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); memset(ctx,0,sizeof *ctx); } unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, const 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_CTX_init(&c); HMAC_Init(&c,key,key_len,evp_md); HMAC_Update(&c,d,n); HMAC_Final(&c,md,md_len); HMAC_CTX_cleanup(&c); return(md); }