1*0Sstevel@tonic-gate /* crypto/hmac/hmac.c */ 2*0Sstevel@tonic-gate /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * This package is an SSL implementation written 6*0Sstevel@tonic-gate * by Eric Young (eay@cryptsoft.com). 7*0Sstevel@tonic-gate * The implementation was written so as to conform with Netscapes SSL. 8*0Sstevel@tonic-gate * 9*0Sstevel@tonic-gate * This library is free for commercial and non-commercial use as long as 10*0Sstevel@tonic-gate * the following conditions are aheared to. The following conditions 11*0Sstevel@tonic-gate * apply to all code found in this distribution, be it the RC4, RSA, 12*0Sstevel@tonic-gate * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13*0Sstevel@tonic-gate * included with this distribution is covered by the same copyright terms 14*0Sstevel@tonic-gate * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15*0Sstevel@tonic-gate * 16*0Sstevel@tonic-gate * Copyright remains Eric Young's, and as such any Copyright notices in 17*0Sstevel@tonic-gate * the code are not to be removed. 18*0Sstevel@tonic-gate * If this package is used in a product, Eric Young should be given attribution 19*0Sstevel@tonic-gate * as the author of the parts of the library used. 20*0Sstevel@tonic-gate * This can be in the form of a textual message at program startup or 21*0Sstevel@tonic-gate * in documentation (online or textual) provided with the package. 22*0Sstevel@tonic-gate * 23*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 24*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 25*0Sstevel@tonic-gate * are met: 26*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the copyright 27*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 28*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 29*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 30*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 31*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 32*0Sstevel@tonic-gate * must display the following acknowledgement: 33*0Sstevel@tonic-gate * "This product includes cryptographic software written by 34*0Sstevel@tonic-gate * Eric Young (eay@cryptsoft.com)" 35*0Sstevel@tonic-gate * The word 'cryptographic' can be left out if the rouines from the library 36*0Sstevel@tonic-gate * being used are not cryptographic related :-). 37*0Sstevel@tonic-gate * 4. If you include any Windows specific code (or a derivative thereof) from 38*0Sstevel@tonic-gate * the apps directory (application code) you must include an acknowledgement: 39*0Sstevel@tonic-gate * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40*0Sstevel@tonic-gate * 41*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51*0Sstevel@tonic-gate * SUCH DAMAGE. 52*0Sstevel@tonic-gate * 53*0Sstevel@tonic-gate * The licence and distribution terms for any publically available version or 54*0Sstevel@tonic-gate * derivative of this code cannot be changed. i.e. this code cannot simply be 55*0Sstevel@tonic-gate * copied and put under another distribution licence 56*0Sstevel@tonic-gate * [including the GNU Public Licence.] 57*0Sstevel@tonic-gate */ 58*0Sstevel@tonic-gate #include <stdio.h> 59*0Sstevel@tonic-gate #include <stdlib.h> 60*0Sstevel@tonic-gate #include <string.h> 61*0Sstevel@tonic-gate #include <openssl/hmac.h> 62*0Sstevel@tonic-gate #include "cryptlib.h" 63*0Sstevel@tonic-gate 64*0Sstevel@tonic-gate void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, 65*0Sstevel@tonic-gate const EVP_MD *md, ENGINE *impl) 66*0Sstevel@tonic-gate { 67*0Sstevel@tonic-gate int i,j,reset=0; 68*0Sstevel@tonic-gate unsigned char pad[HMAC_MAX_MD_CBLOCK]; 69*0Sstevel@tonic-gate 70*0Sstevel@tonic-gate if (md != NULL) 71*0Sstevel@tonic-gate { 72*0Sstevel@tonic-gate reset=1; 73*0Sstevel@tonic-gate ctx->md=md; 74*0Sstevel@tonic-gate } 75*0Sstevel@tonic-gate else 76*0Sstevel@tonic-gate md=ctx->md; 77*0Sstevel@tonic-gate 78*0Sstevel@tonic-gate if (key != NULL) 79*0Sstevel@tonic-gate { 80*0Sstevel@tonic-gate reset=1; 81*0Sstevel@tonic-gate j=EVP_MD_block_size(md); 82*0Sstevel@tonic-gate OPENSSL_assert(j <= sizeof ctx->key); 83*0Sstevel@tonic-gate if (j < len) 84*0Sstevel@tonic-gate { 85*0Sstevel@tonic-gate EVP_DigestInit_ex(&ctx->md_ctx,md, impl); 86*0Sstevel@tonic-gate EVP_DigestUpdate(&ctx->md_ctx,key,len); 87*0Sstevel@tonic-gate EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key, 88*0Sstevel@tonic-gate &ctx->key_length); 89*0Sstevel@tonic-gate } 90*0Sstevel@tonic-gate else 91*0Sstevel@tonic-gate { 92*0Sstevel@tonic-gate OPENSSL_assert(len <= sizeof ctx->key); 93*0Sstevel@tonic-gate memcpy(ctx->key,key,len); 94*0Sstevel@tonic-gate ctx->key_length=len; 95*0Sstevel@tonic-gate } 96*0Sstevel@tonic-gate if(ctx->key_length != HMAC_MAX_MD_CBLOCK) 97*0Sstevel@tonic-gate memset(&ctx->key[ctx->key_length], 0, 98*0Sstevel@tonic-gate HMAC_MAX_MD_CBLOCK - ctx->key_length); 99*0Sstevel@tonic-gate } 100*0Sstevel@tonic-gate 101*0Sstevel@tonic-gate if (reset) 102*0Sstevel@tonic-gate { 103*0Sstevel@tonic-gate for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) 104*0Sstevel@tonic-gate pad[i]=0x36^ctx->key[i]; 105*0Sstevel@tonic-gate EVP_DigestInit_ex(&ctx->i_ctx,md, impl); 106*0Sstevel@tonic-gate EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md)); 107*0Sstevel@tonic-gate 108*0Sstevel@tonic-gate for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) 109*0Sstevel@tonic-gate pad[i]=0x5c^ctx->key[i]; 110*0Sstevel@tonic-gate EVP_DigestInit_ex(&ctx->o_ctx,md, impl); 111*0Sstevel@tonic-gate EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md)); 112*0Sstevel@tonic-gate } 113*0Sstevel@tonic-gate EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx); 114*0Sstevel@tonic-gate } 115*0Sstevel@tonic-gate 116*0Sstevel@tonic-gate void HMAC_Init(HMAC_CTX *ctx, const void *key, int len, 117*0Sstevel@tonic-gate const EVP_MD *md) 118*0Sstevel@tonic-gate { 119*0Sstevel@tonic-gate if(key && md) 120*0Sstevel@tonic-gate HMAC_CTX_init(ctx); 121*0Sstevel@tonic-gate HMAC_Init_ex(ctx,key,len,md, NULL); 122*0Sstevel@tonic-gate } 123*0Sstevel@tonic-gate 124*0Sstevel@tonic-gate void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, int len) 125*0Sstevel@tonic-gate { 126*0Sstevel@tonic-gate EVP_DigestUpdate(&ctx->md_ctx,data,len); 127*0Sstevel@tonic-gate } 128*0Sstevel@tonic-gate 129*0Sstevel@tonic-gate void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) 130*0Sstevel@tonic-gate { 131*0Sstevel@tonic-gate int j; 132*0Sstevel@tonic-gate unsigned int i; 133*0Sstevel@tonic-gate unsigned char buf[EVP_MAX_MD_SIZE]; 134*0Sstevel@tonic-gate 135*0Sstevel@tonic-gate j=EVP_MD_block_size(ctx->md); 136*0Sstevel@tonic-gate 137*0Sstevel@tonic-gate EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i); 138*0Sstevel@tonic-gate EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx); 139*0Sstevel@tonic-gate EVP_DigestUpdate(&ctx->md_ctx,buf,i); 140*0Sstevel@tonic-gate EVP_DigestFinal_ex(&ctx->md_ctx,md,len); 141*0Sstevel@tonic-gate } 142*0Sstevel@tonic-gate 143*0Sstevel@tonic-gate void HMAC_CTX_init(HMAC_CTX *ctx) 144*0Sstevel@tonic-gate { 145*0Sstevel@tonic-gate EVP_MD_CTX_init(&ctx->i_ctx); 146*0Sstevel@tonic-gate EVP_MD_CTX_init(&ctx->o_ctx); 147*0Sstevel@tonic-gate EVP_MD_CTX_init(&ctx->md_ctx); 148*0Sstevel@tonic-gate } 149*0Sstevel@tonic-gate 150*0Sstevel@tonic-gate void HMAC_CTX_cleanup(HMAC_CTX *ctx) 151*0Sstevel@tonic-gate { 152*0Sstevel@tonic-gate EVP_MD_CTX_cleanup(&ctx->i_ctx); 153*0Sstevel@tonic-gate EVP_MD_CTX_cleanup(&ctx->o_ctx); 154*0Sstevel@tonic-gate EVP_MD_CTX_cleanup(&ctx->md_ctx); 155*0Sstevel@tonic-gate memset(ctx,0,sizeof *ctx); 156*0Sstevel@tonic-gate } 157*0Sstevel@tonic-gate 158*0Sstevel@tonic-gate unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, 159*0Sstevel@tonic-gate const unsigned char *d, int n, unsigned char *md, 160*0Sstevel@tonic-gate unsigned int *md_len) 161*0Sstevel@tonic-gate { 162*0Sstevel@tonic-gate HMAC_CTX c; 163*0Sstevel@tonic-gate static unsigned char m[EVP_MAX_MD_SIZE]; 164*0Sstevel@tonic-gate 165*0Sstevel@tonic-gate if (md == NULL) md=m; 166*0Sstevel@tonic-gate HMAC_CTX_init(&c); 167*0Sstevel@tonic-gate HMAC_Init(&c,key,key_len,evp_md); 168*0Sstevel@tonic-gate HMAC_Update(&c,d,n); 169*0Sstevel@tonic-gate HMAC_Final(&c,md,md_len); 170*0Sstevel@tonic-gate HMAC_CTX_cleanup(&c); 171*0Sstevel@tonic-gate return(md); 172*0Sstevel@tonic-gate } 173*0Sstevel@tonic-gate 174