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.]
59 #define OPENSSL_FIPSAPI
65 #include <openssl/hmac.h>
67 int HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len,
68 const EVP_MD *md, ENGINE *impl)
71 unsigned char pad[HMAC_MAX_MD_CBLOCK];
84 j=M_EVP_MD_block_size(md);
85 OPENSSL_assert(j <= (int)sizeof(ctx->key));
88 if (!EVP_DigestInit_ex(&ctx->md_ctx,md, impl))
90 if (!EVP_DigestUpdate(&ctx->md_ctx,key,len))
92 if (!EVP_DigestFinal_ex(&(ctx->md_ctx),ctx->key,
98 OPENSSL_assert(len>=0 && len<=(int)sizeof(ctx->key));
99 memcpy(ctx->key,key,len);
102 if(ctx->key_length != HMAC_MAX_MD_CBLOCK)
103 memset(&ctx->key[ctx->key_length], 0,
104 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,M_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,M_EVP_MD_block_size(md)))
123 if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->i_ctx))
130 int HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md)
134 return HMAC_Init_ex(ctx,key,len,md, NULL);
137 int HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len)
139 return EVP_DigestUpdate(&ctx->md_ctx,data,len);
142 int HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len)
145 unsigned char buf[EVP_MAX_MD_SIZE];
147 if (!EVP_DigestFinal_ex(&ctx->md_ctx,buf,&i))
149 if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx,&ctx->o_ctx))
151 if (!EVP_DigestUpdate(&ctx->md_ctx,buf,i))
153 if (!EVP_DigestFinal_ex(&ctx->md_ctx,md,len))
160 void HMAC_CTX_init(HMAC_CTX *ctx)
162 EVP_MD_CTX_init(&ctx->i_ctx);
163 EVP_MD_CTX_init(&ctx->o_ctx);
164 EVP_MD_CTX_init(&ctx->md_ctx);
167 int HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx)
170 if (!EVP_MD_CTX_copy_ex(&dctx->i_ctx, &sctx->i_ctx))
172 if (!EVP_MD_CTX_copy_ex(&dctx->o_ctx, &sctx->o_ctx))
174 if (!EVP_MD_CTX_copy_ex(&dctx->md_ctx, &sctx->md_ctx))
176 memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK);
177 dctx->key_length = sctx->key_length;
184 void HMAC_CTX_cleanup(HMAC_CTX *ctx)
186 EVP_MD_CTX_cleanup(&ctx->i_ctx);
187 EVP_MD_CTX_cleanup(&ctx->o_ctx);
188 EVP_MD_CTX_cleanup(&ctx->md_ctx);
189 memset(ctx,0,sizeof *ctx);
192 unsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len,
193 const unsigned char *d, size_t n, unsigned char *md,
194 unsigned int *md_len)
197 static unsigned char m[EVP_MAX_MD_SIZE];
199 if (md == NULL) md=m;
201 if (!HMAC_Init(&c,key,key_len,evp_md))
203 if (!HMAC_Update(&c,d,n))
205 if (!HMAC_Final(&c,md,md_len))
207 HMAC_CTX_cleanup(&c);
213 void HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags)
215 M_EVP_MD_CTX_set_flags(&ctx->i_ctx, flags);
216 M_EVP_MD_CTX_set_flags(&ctx->o_ctx, flags);
217 M_EVP_MD_CTX_set_flags(&ctx->md_ctx, flags);