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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/hmac/hmac.c
1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.]
61 #include "internal/cryptlib.h"
62 #include <openssl/hmac.h>
63 #include <openssl/opensslconf.h>
66 int HMAC_Init_ex(HMAC_CTX
*ctx
, const void *key
, int len
,
67 const EVP_MD
*md
, ENGINE
*impl
)
70 unsigned char pad
[HMAC_MAX_MD_CBLOCK
];
72 /* If we are changing MD then we must have a key */
73 if (md
!= NULL
&& md
!= ctx
->md
&& (key
== NULL
|| len
< 0))
87 j
= EVP_MD_block_size(md
);
88 OPENSSL_assert(j
<= (int)sizeof(ctx
->key
));
90 if (!EVP_DigestInit_ex(ctx
->md_ctx
, md
, impl
))
92 if (!EVP_DigestUpdate(ctx
->md_ctx
, key
, len
))
94 if (!EVP_DigestFinal_ex(ctx
->md_ctx
, ctx
->key
,
98 if (len
< 0 || len
> (int)sizeof(ctx
->key
))
100 memcpy(ctx
->key
, key
, len
);
101 ctx
->key_length
= len
;
103 if (ctx
->key_length
!= HMAC_MAX_MD_CBLOCK
)
104 memset(&ctx
->key
[ctx
->key_length
], 0,
105 HMAC_MAX_MD_CBLOCK
- ctx
->key_length
);
109 for (i
= 0; i
< HMAC_MAX_MD_CBLOCK
; i
++)
110 pad
[i
] = 0x36 ^ ctx
->key
[i
];
111 if (!EVP_DigestInit_ex(ctx
->i_ctx
, md
, impl
))
113 if (!EVP_DigestUpdate(ctx
->i_ctx
, pad
, EVP_MD_block_size(md
)))
116 for (i
= 0; i
< HMAC_MAX_MD_CBLOCK
; i
++)
117 pad
[i
] = 0x5c ^ ctx
->key
[i
];
118 if (!EVP_DigestInit_ex(ctx
->o_ctx
, md
, impl
))
120 if (!EVP_DigestUpdate(ctx
->o_ctx
, pad
, EVP_MD_block_size(md
)))
123 if (!EVP_MD_CTX_copy_ex(ctx
->md_ctx
, ctx
->i_ctx
))
130 #if OPENSSL_API_COMPAT < 0x10100000L
131 int HMAC_Init(HMAC_CTX
*ctx
, const void *key
, int len
, const EVP_MD
*md
)
135 return HMAC_Init_ex(ctx
, key
, len
, md
, NULL
);
139 int HMAC_Update(HMAC_CTX
*ctx
, const unsigned char *data
, size_t len
)
143 return EVP_DigestUpdate(ctx
->md_ctx
, data
, len
);
146 int HMAC_Final(HMAC_CTX
*ctx
, unsigned char *md
, unsigned int *len
)
149 unsigned char buf
[EVP_MAX_MD_SIZE
];
154 if (!EVP_DigestFinal_ex(ctx
->md_ctx
, buf
, &i
))
156 if (!EVP_MD_CTX_copy_ex(ctx
->md_ctx
, ctx
->o_ctx
))
158 if (!EVP_DigestUpdate(ctx
->md_ctx
, buf
, i
))
160 if (!EVP_DigestFinal_ex(ctx
->md_ctx
, md
, len
))
167 size_t HMAC_size(HMAC_CTX
*ctx
)
169 return EVP_MD_size((ctx
)->md
);
172 HMAC_CTX
*HMAC_CTX_new(void)
174 HMAC_CTX
*ctx
= (HMAC_CTX
*)OPENSSL_zalloc(sizeof(HMAC_CTX
));
176 if (!HMAC_CTX_reset(ctx
)) {
183 static void hmac_ctx_cleanup(HMAC_CTX
*ctx
)
185 EVP_MD_CTX_reset(ctx
->i_ctx
);
186 EVP_MD_CTX_reset(ctx
->o_ctx
);
187 EVP_MD_CTX_reset(ctx
->md_ctx
);
190 memset(ctx
->key
, 0, sizeof(HMAC_MAX_MD_CBLOCK
));
193 void HMAC_CTX_free(HMAC_CTX
*ctx
)
196 hmac_ctx_cleanup(ctx
);
197 EVP_MD_CTX_free(ctx
->i_ctx
);
198 EVP_MD_CTX_free(ctx
->o_ctx
);
199 EVP_MD_CTX_free(ctx
->md_ctx
);
204 int HMAC_CTX_reset(HMAC_CTX
*ctx
)
206 hmac_ctx_cleanup(ctx
);
207 if (ctx
->i_ctx
== NULL
)
208 ctx
->i_ctx
= EVP_MD_CTX_new();
209 if (ctx
->i_ctx
== NULL
)
211 if (ctx
->o_ctx
== NULL
)
212 ctx
->o_ctx
= EVP_MD_CTX_new();
213 if (ctx
->o_ctx
== NULL
)
215 if (ctx
->md_ctx
== NULL
)
216 ctx
->md_ctx
= EVP_MD_CTX_new();
217 if (ctx
->md_ctx
== NULL
)
222 hmac_ctx_cleanup(ctx
);
226 int HMAC_CTX_copy(HMAC_CTX
*dctx
, HMAC_CTX
*sctx
)
228 if (!HMAC_CTX_reset(dctx
))
230 if (!EVP_MD_CTX_copy_ex(dctx
->i_ctx
, sctx
->i_ctx
))
232 if (!EVP_MD_CTX_copy_ex(dctx
->o_ctx
, sctx
->o_ctx
))
234 if (!EVP_MD_CTX_copy_ex(dctx
->md_ctx
, sctx
->md_ctx
))
236 memcpy(dctx
->key
, sctx
->key
, HMAC_MAX_MD_CBLOCK
);
237 dctx
->key_length
= sctx
->key_length
;
241 hmac_ctx_cleanup(dctx
);
245 unsigned char *HMAC(const EVP_MD
*evp_md
, const void *key
, int key_len
,
246 const unsigned char *d
, size_t n
, unsigned char *md
,
247 unsigned int *md_len
)
250 static unsigned char m
[EVP_MAX_MD_SIZE
];
254 if ((c
= HMAC_CTX_new()) == NULL
)
256 if (!HMAC_Init_ex(c
, key
, key_len
, evp_md
, NULL
))
258 if (!HMAC_Update(c
, d
, n
))
260 if (!HMAC_Final(c
, md
, md_len
))
269 void HMAC_CTX_set_flags(HMAC_CTX
*ctx
, unsigned long flags
)
271 EVP_MD_CTX_set_flags(ctx
->i_ctx
, flags
);
272 EVP_MD_CTX_set_flags(ctx
->o_ctx
, flags
);
273 EVP_MD_CTX_set_flags(ctx
->md_ctx
, flags
);