Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 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 "cryptlib.h" |
| 62 | #include <openssl/hmac.h> |
| 63 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 64 | int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, |
| 65 | const EVP_MD *md, ENGINE *impl) |
| 66 | { |
| 67 | int i,j,reset=0; |
| 68 | unsigned char pad[HMAC_MAX_MD_CBLOCK]; |
| 69 | |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 70 | if (md != NULL) |
| 71 | { |
| 72 | reset=1; |
| 73 | ctx->md=md; |
| 74 | } |
| 75 | else |
| 76 | md=ctx->md; |
| 77 | |
| 78 | if (key != NULL) |
| 79 | { |
| 80 | reset=1; |
| 81 | j=EVP_MD_block_size(md); |
| 82 | OPENSSL_assert(j <= (int)sizeof(ctx->key)); |
| 83 | if (j < len) |
| 84 | { |
| 85 | if (!EVP_DigestInit_ex(&ctx->md_ctx,md, impl)) |
| 86 | goto err; |
| 87 | if (!EVP_DigestUpdate(&ctx->md_ctx,key,len)) |
| 88 | goto err; |
| 89 | if (!EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key, |
| 90 | &ctx->key_length)) |
| 91 | goto err; |
| 92 | } |
| 93 | else |
| 94 | { |
| 95 | OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key)); |
| 96 | memcpy(ctx->key,key,len); |
| 97 | ctx->key_length=len; |
| 98 | } |
| 99 | if(ctx->key_length != HMAC_MAX_MD_CBLOCK) |
| 100 | memset(&ctx->key[ctx->key_length], 0, |
| 101 | HMAC_MAX_MD_CBLOCK - ctx->key_length); |
| 102 | } |
| 103 | |
| 104 | if (reset) |
| 105 | { |
| 106 | for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) |
| 107 | pad[i]=0x36^ctx->key[i]; |
| 108 | if (!EVP_DigestInit_ex(&ctx->i_ctx,md, impl)) |
| 109 | goto err; |
| 110 | if (!EVP_DigestUpdate(&ctx->i_ctx,pad,EVP_MD_block_size(md))) |
| 111 | goto err; |
| 112 | |
| 113 | for (i=0; i<HMAC_MAX_MD_CBLOCK; i++) |
| 114 | pad[i]=0x5c^ctx->key[i]; |
| 115 | if (!EVP_DigestInit_ex(&ctx->o_ctx,md, impl)) |
| 116 | goto err; |
| 117 | if (!EVP_DigestUpdate(&ctx->o_ctx,pad,EVP_MD_block_size(md))) |
| 118 | goto err; |
| 119 | } |
| 120 | if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx)) |
| 121 | goto err; |
| 122 | return 1; |
| 123 | err: |
| 124 | return 0; |
| 125 | } |
| 126 | |
| 127 | int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) |
| 128 | { |
| 129 | if(key && md) |
| 130 | HMAC_CTX_init(ctx); |
| 131 | return HMAC_Init_ex(ctx,key,len,md, NULL); |
| 132 | } |
| 133 | |
| 134 | int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) |
| 135 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 136 | return EVP_DigestUpdate(&ctx->md_ctx,data,len); |
| 137 | } |
| 138 | |
| 139 | int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) |
| 140 | { |
| 141 | unsigned int i; |
| 142 | unsigned char buf[EVP_MAX_MD_SIZE]; |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 143 | |
| 144 | if (!EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i)) |
| 145 | goto err; |
| 146 | if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx)) |
| 147 | goto err; |
| 148 | if (!EVP_DigestUpdate(&ctx->md_ctx,buf,i)) |
| 149 | goto err; |
| 150 | if (!EVP_DigestFinal_ex(&ctx->md_ctx,md,len)) |
| 151 | goto err; |
| 152 | return 1; |
| 153 | err: |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | void HMAC_CTX_init(HMAC_CTX *ctx) |
| 158 | { |
| 159 | EVP_MD_CTX_init(&ctx->i_ctx); |
| 160 | EVP_MD_CTX_init(&ctx->o_ctx); |
| 161 | EVP_MD_CTX_init(&ctx->md_ctx); |
| 162 | } |
| 163 | |
| 164 | int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) |
| 165 | { |
| 166 | if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx)) |
| 167 | goto err; |
| 168 | if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx)) |
| 169 | goto err; |
| 170 | if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx)) |
| 171 | goto err; |
| 172 | memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); |
| 173 | dctx->key_length = sctx->key_length; |
| 174 | dctx->md = sctx->md; |
| 175 | return 1; |
| 176 | err: |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | void HMAC_CTX_cleanup(HMAC_CTX *ctx) |
| 181 | { |
Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 182 | EVP_MD_CTX_cleanup(&ctx->i_ctx); |
| 183 | EVP_MD_CTX_cleanup(&ctx->o_ctx); |
| 184 | EVP_MD_CTX_cleanup(&ctx->md_ctx); |
| 185 | memset(ctx,0,sizeof *ctx); |
| 186 | } |
| 187 | |
| 188 | unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, |
| 189 | const unsigned char *d, size_t n, unsigned char *md, |
| 190 | unsigned int *md_len) |
| 191 | { |
| 192 | HMAC_CTX c; |
| 193 | static unsigned char m[EVP_MAX_MD_SIZE]; |
| 194 | |
| 195 | if (md == NULL) md=m; |
| 196 | HMAC_CTX_init(&c); |
| 197 | if (!HMAC_Init(&c,key,key_len,evp_md)) |
| 198 | goto err; |
| 199 | if (!HMAC_Update(&c,d,n)) |
| 200 | goto err; |
| 201 | if (!HMAC_Final(&c,md,md_len)) |
| 202 | goto err; |
| 203 | HMAC_CTX_cleanup(&c); |
| 204 | return md; |
| 205 | err: |
| 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) |
| 210 | { |
| 211 | EVP_MD_CTX_set_flags(&ctx->i_ctx, flags); |
| 212 | EVP_MD_CTX_set_flags(&ctx->o_ctx, flags); |
| 213 | EVP_MD_CTX_set_flags(&ctx->md_ctx, flags); |
| 214 | } |