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58964a49 RE |
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. | |
0f113f3e | 8 | * |
58964a49 RE |
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). | |
0f113f3e | 15 | * |
58964a49 RE |
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. | |
0f113f3e | 22 | * |
58964a49 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
58964a49 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
58964a49 RE |
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. | |
0f113f3e | 52 | * |
58964a49 RE |
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 | */ | |
6dff52e8 | 58 | |
58964a49 RE |
59 | #include <stdio.h> |
60 | #include <stdlib.h> | |
61 | #include <string.h> | |
b39fc560 | 62 | #include "internal/cryptlib.h" |
25a66ee3 | 63 | #include <openssl/hmac.h> |
58964a49 | 64 | |
6343829a | 65 | int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, |
0f113f3e MC |
66 | const EVP_MD *md, ENGINE *impl) |
67 | { | |
68 | int i, j, reset = 0; | |
69 | unsigned char pad[HMAC_MAX_MD_CBLOCK]; | |
70 | ||
71 | if (md != NULL) { | |
72 | reset = 1; | |
73 | ctx->md = md; | |
61986d32 | 74 | } else if (ctx->md) { |
0f113f3e | 75 | md = ctx->md; |
e2095c65 MC |
76 | } else { |
77 | return 0; | |
78 | } | |
79 | ||
61986d32 | 80 | if (!ctx->key_init && key == NULL) |
e2095c65 | 81 | return 0; |
0f113f3e MC |
82 | |
83 | if (key != NULL) { | |
84 | reset = 1; | |
85 | j = M_EVP_MD_block_size(md); | |
86 | OPENSSL_assert(j <= (int)sizeof(ctx->key)); | |
87 | if (j < len) { | |
88 | if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl)) | |
89 | goto err; | |
90 | if (!EVP_DigestUpdate(&ctx->md_ctx, key, len)) | |
91 | goto err; | |
92 | if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key, | |
93 | &ctx->key_length)) | |
94 | goto err; | |
95 | } else { | |
61986d32 | 96 | if (len < 0 || len > (int)sizeof(ctx->key)) |
c62e94d8 | 97 | return 0; |
0f113f3e MC |
98 | memcpy(ctx->key, key, len); |
99 | ctx->key_length = len; | |
100 | } | |
101 | if (ctx->key_length != HMAC_MAX_MD_CBLOCK) | |
102 | memset(&ctx->key[ctx->key_length], 0, | |
103 | HMAC_MAX_MD_CBLOCK - ctx->key_length); | |
e2095c65 | 104 | ctx->key_init = 1; |
0f113f3e MC |
105 | } |
106 | ||
107 | if (reset) { | |
108 | for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) | |
109 | pad[i] = 0x36 ^ ctx->key[i]; | |
110 | if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl)) | |
111 | goto err; | |
112 | if (!EVP_DigestUpdate(&ctx->i_ctx, pad, M_EVP_MD_block_size(md))) | |
113 | goto err; | |
114 | ||
115 | for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) | |
116 | pad[i] = 0x5c ^ ctx->key[i]; | |
117 | if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl)) | |
118 | goto err; | |
119 | if (!EVP_DigestUpdate(&ctx->o_ctx, pad, M_EVP_MD_block_size(md))) | |
120 | goto err; | |
121 | } | |
122 | if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx)) | |
123 | goto err; | |
124 | return 1; | |
125 | err: | |
126 | return 0; | |
127 | } | |
58964a49 | 128 | |
00a5a74b | 129 | #ifndef OPENSSL_NO_DEPRECATED |
6343829a | 130 | int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) |
0f113f3e MC |
131 | { |
132 | if (key && md) | |
133 | HMAC_CTX_init(ctx); | |
134 | return HMAC_Init_ex(ctx, key, len, md, NULL); | |
135 | } | |
00a5a74b | 136 | #endif |
ff3fa48f | 137 | |
87d52468 | 138 | int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) |
0f113f3e | 139 | { |
61986d32 | 140 | if (!ctx->key_init) |
e2095c65 | 141 | return 0; |
0f113f3e MC |
142 | return EVP_DigestUpdate(&ctx->md_ctx, data, len); |
143 | } | |
58964a49 | 144 | |
87d52468 | 145 | int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) |
0f113f3e MC |
146 | { |
147 | unsigned int i; | |
148 | unsigned char buf[EVP_MAX_MD_SIZE]; | |
149 | ||
61986d32 | 150 | if (!ctx->key_init) |
e2095c65 MC |
151 | goto err; |
152 | ||
0f113f3e MC |
153 | if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i)) |
154 | goto err; | |
155 | if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx)) | |
156 | goto err; | |
157 | if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i)) | |
158 | goto err; | |
159 | if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len)) | |
160 | goto err; | |
161 | return 1; | |
162 | err: | |
163 | return 0; | |
164 | } | |
dbad1690 BL |
165 | |
166 | void HMAC_CTX_init(HMAC_CTX *ctx) | |
0f113f3e MC |
167 | { |
168 | EVP_MD_CTX_init(&ctx->i_ctx); | |
169 | EVP_MD_CTX_init(&ctx->o_ctx); | |
170 | EVP_MD_CTX_init(&ctx->md_ctx); | |
e2095c65 MC |
171 | ctx->key_init = 0; |
172 | ctx->md = NULL; | |
0f113f3e | 173 | } |
58964a49 | 174 | |
87d52468 | 175 | int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) |
0f113f3e MC |
176 | { |
177 | HMAC_CTX_init(dctx); | |
178 | if (!EVP_MD_CTX_copy_ex(&dctx->i_ctx, &sctx->i_ctx)) | |
179 | goto err; | |
180 | if (!EVP_MD_CTX_copy_ex(&dctx->o_ctx, &sctx->o_ctx)) | |
181 | goto err; | |
182 | if (!EVP_MD_CTX_copy_ex(&dctx->md_ctx, &sctx->md_ctx)) | |
183 | goto err; | |
e2095c65 | 184 | dctx->key_init = sctx->key_init; |
61986d32 | 185 | if (sctx->key_init) { |
e2095c65 MC |
186 | memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); |
187 | dctx->key_length = sctx->key_length; | |
188 | } | |
0f113f3e MC |
189 | dctx->md = sctx->md; |
190 | return 1; | |
191 | err: | |
192 | return 0; | |
193 | } | |
74633553 | 194 | |
dbad1690 | 195 | void HMAC_CTX_cleanup(HMAC_CTX *ctx) |
0f113f3e MC |
196 | { |
197 | EVP_MD_CTX_cleanup(&ctx->i_ctx); | |
198 | EVP_MD_CTX_cleanup(&ctx->o_ctx); | |
199 | EVP_MD_CTX_cleanup(&ctx->md_ctx); | |
b4faea50 | 200 | memset(ctx, 0, sizeof(*ctx)); |
0f113f3e | 201 | } |
58964a49 | 202 | |
6343829a | 203 | unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, |
0f113f3e MC |
204 | const unsigned char *d, size_t n, unsigned char *md, |
205 | unsigned int *md_len) | |
206 | { | |
207 | HMAC_CTX c; | |
208 | static unsigned char m[EVP_MAX_MD_SIZE]; | |
209 | ||
210 | if (md == NULL) | |
211 | md = m; | |
212 | HMAC_CTX_init(&c); | |
00a5a74b | 213 | if (!HMAC_Init_ex(&c, key, key_len, evp_md, NULL)) |
0f113f3e MC |
214 | goto err; |
215 | if (!HMAC_Update(&c, d, n)) | |
216 | goto err; | |
217 | if (!HMAC_Final(&c, md, md_len)) | |
218 | goto err; | |
219 | HMAC_CTX_cleanup(&c); | |
220 | return md; | |
221 | err: | |
222 | return NULL; | |
223 | } | |
58964a49 | 224 | |
e92f9f45 | 225 | void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) |
0f113f3e MC |
226 | { |
227 | M_EVP_MD_CTX_set_flags(&ctx->i_ctx, flags); | |
228 | M_EVP_MD_CTX_set_flags(&ctx->o_ctx, flags); | |
229 | M_EVP_MD_CTX_set_flags(&ctx->md_ctx, flags); | |
230 | } |