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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/hmac/hmac.c
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1 /* crypto/hmac/hmac.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/hmac.h>
64 void HMAC_Init_ex(HMAC_CTX
*ctx
, const void *key
, int len
,
65 const EVP_MD
*md
, ENGINE
*impl
)
68 unsigned char pad
[HMAC_MAX_MD_CBLOCK
];
81 j
=EVP_MD_block_size(md
);
82 OPENSSL_assert(j
<= (int)sizeof(ctx
->key
));
85 EVP_DigestInit_ex(&ctx
->md_ctx
,md
, impl
);
86 EVP_DigestUpdate(&ctx
->md_ctx
,key
,len
);
87 EVP_DigestFinal_ex(&(ctx
->md_ctx
),ctx
->key
,
92 OPENSSL_assert(len
>=0 && len
<=(int)sizeof(ctx
->key
));
93 memcpy(ctx
->key
,key
,len
);
96 if(ctx
->key_length
!= HMAC_MAX_MD_CBLOCK
)
97 memset(&ctx
->key
[ctx
->key_length
], 0,
98 HMAC_MAX_MD_CBLOCK
- ctx
->key_length
);
103 for (i
=0; i
<HMAC_MAX_MD_CBLOCK
; i
++)
104 pad
[i
]=0x36^ctx
->key
[i
];
105 EVP_DigestInit_ex(&ctx
->i_ctx
,md
, impl
);
106 EVP_DigestUpdate(&ctx
->i_ctx
,pad
,EVP_MD_block_size(md
));
108 for (i
=0; i
<HMAC_MAX_MD_CBLOCK
; i
++)
109 pad
[i
]=0x5c^ctx
->key
[i
];
110 EVP_DigestInit_ex(&ctx
->o_ctx
,md
, impl
);
111 EVP_DigestUpdate(&ctx
->o_ctx
,pad
,EVP_MD_block_size(md
));
113 EVP_MD_CTX_copy_ex(&ctx
->md_ctx
,&ctx
->i_ctx
);
116 void HMAC_Init(HMAC_CTX
*ctx
, const void *key
, int len
,
121 HMAC_Init_ex(ctx
,key
,len
,md
, NULL
);
124 void HMAC_Update(HMAC_CTX
*ctx
, const unsigned char *data
, size_t len
)
126 EVP_DigestUpdate(&ctx
->md_ctx
,data
,len
);
129 void HMAC_Final(HMAC_CTX
*ctx
, unsigned char *md
, unsigned int *len
)
133 unsigned char buf
[EVP_MAX_MD_SIZE
];
135 j
=EVP_MD_block_size(ctx
->md
);
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
);
143 void HMAC_CTX_init(HMAC_CTX
*ctx
)
145 EVP_MD_CTX_init(&ctx
->i_ctx
);
146 EVP_MD_CTX_init(&ctx
->o_ctx
);
147 EVP_MD_CTX_init(&ctx
->md_ctx
);
150 void HMAC_CTX_cleanup(HMAC_CTX
*ctx
)
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
);
158 unsigned 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
)
163 static unsigned char m
[EVP_MAX_MD_SIZE
];
165 if (md
== NULL
) md
=m
;
167 HMAC_Init(&c
,key
,key_len
,evp_md
);
169 HMAC_Final(&c
,md
,md_len
);
170 HMAC_CTX_cleanup(&c
);