fips_hmac.c revision 296465
1/* crypto/hmac/hmac.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58#include <stdio.h> 59#include <stdlib.h> 60#include <string.h> 61#include <openssl/hmac.h> 62#include <openssl/fips.h> 63 64#ifdef OPENSSL_FIPS 65 66void HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, 67 const EVP_MD *md, ENGINE *impl) 68{ 69 int i, j, reset = 0; 70 unsigned char pad[HMAC_MAX_MD_CBLOCK]; 71 72 if (md != NULL) { 73 reset = 1; 74 ctx->md = md; 75 } else 76 md = ctx->md; 77 78 if (key != NULL) { 79 if (FIPS_mode() && !(md->flags & EVP_MD_FLAG_FIPS) 80 && (!(ctx->md_ctx.flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW) 81 || !(ctx->i_ctx.flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW) 82 || !(ctx->o_ctx.flags & EVP_MD_CTX_FLAG_NON_FIPS_ALLOW))) 83 OpenSSLDie(__FILE__, __LINE__, 84 "HMAC: digest not allowed in FIPS mode"); 85 86 reset = 1; 87 j = M_EVP_MD_block_size(md); 88 OPENSSL_assert(j <= (int)sizeof ctx->key); 89 if (j < len) { 90 EVP_DigestInit_ex(&ctx->md_ctx, md, impl); 91 EVP_DigestUpdate(&ctx->md_ctx, key, len); 92 EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key, &ctx->key_length); 93 } else { 94 OPENSSL_assert(len <= (int)sizeof ctx->key); 95 memcpy(ctx->key, key, len); 96 ctx->key_length = len; 97 } 98 if (ctx->key_length != HMAC_MAX_MD_CBLOCK) 99 memset(&ctx->key[ctx->key_length], 0, 100 HMAC_MAX_MD_CBLOCK - ctx->key_length); 101 } 102 103 if (reset) { 104 for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) 105 pad[i] = 0x36 ^ ctx->key[i]; 106 EVP_DigestInit_ex(&ctx->i_ctx, md, impl); 107 EVP_DigestUpdate(&ctx->i_ctx, pad, M_EVP_MD_block_size(md)); 108 109 for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) 110 pad[i] = 0x5c ^ ctx->key[i]; 111 EVP_DigestInit_ex(&ctx->o_ctx, md, impl); 112 EVP_DigestUpdate(&ctx->o_ctx, pad, M_EVP_MD_block_size(md)); 113 } 114 EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx); 115} 116 117void HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) 118{ 119 if (key && md) 120 HMAC_CTX_init(ctx); 121 HMAC_Init_ex(ctx, key, len, md, NULL); 122} 123 124void HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) 125{ 126 EVP_DigestUpdate(&ctx->md_ctx, data, len); 127} 128 129void HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) 130{ 131 int j; 132 unsigned int i; 133 unsigned char buf[EVP_MAX_MD_SIZE]; 134 135 j = M_EVP_MD_block_size(ctx->md); 136 137 EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i); 138 EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx); 139 EVP_DigestUpdate(&ctx->md_ctx, buf, i); 140 EVP_DigestFinal_ex(&ctx->md_ctx, md, len); 141} 142 143void HMAC_CTX_init(HMAC_CTX *ctx) 144{ 145 EVP_MD_CTX_init(&ctx->i_ctx); 146 EVP_MD_CTX_init(&ctx->o_ctx); 147 EVP_MD_CTX_init(&ctx->md_ctx); 148} 149 150void HMAC_CTX_cleanup(HMAC_CTX *ctx) 151{ 152 EVP_MD_CTX_cleanup(&ctx->i_ctx); 153 EVP_MD_CTX_cleanup(&ctx->o_ctx); 154 EVP_MD_CTX_cleanup(&ctx->md_ctx); 155 memset(ctx, 0, sizeof *ctx); 156} 157 158unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, 159 const unsigned char *d, size_t n, unsigned char *md, 160 unsigned int *md_len) 161{ 162 HMAC_CTX c; 163 static unsigned char m[EVP_MAX_MD_SIZE]; 164 165 if (md == NULL) 166 md = m; 167 HMAC_CTX_init(&c); 168 HMAC_Init(&c, key, key_len, evp_md); 169 HMAC_Update(&c, d, n); 170 HMAC_Final(&c, md, md_len); 171 HMAC_CTX_cleanup(&c); 172 return (md); 173} 174 175void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) 176{ 177 M_EVP_MD_CTX_set_flags(&ctx->i_ctx, flags); 178 M_EVP_MD_CTX_set_flags(&ctx->o_ctx, flags); 179 M_EVP_MD_CTX_set_flags(&ctx->md_ctx, flags); 180} 181 182#endif 183