5 * Copyright (c) 2001 Marko Kreen
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * contrib/pgcrypto/px-hmac.c
36 #define HMAC_IPAD 0x36
37 #define HMAC_OPAD 0x5C
40 hmac_result_size(PX_HMAC *h)
42 return px_md_result_size(h->md);
46 hmac_block_size(PX_HMAC *h)
48 return px_md_block_size(h->md);
52 hmac_init(PX_HMAC *h, const uint8 *key, unsigned klen)
59 bs = px_md_block_size(md);
60 keybuf = px_alloc(bs);
61 memset(keybuf, 0, bs);
65 px_md_update(md, key, klen);
66 px_md_finish(md, keybuf);
70 memcpy(keybuf, key, klen);
72 for (i = 0; i < bs; i++)
74 h->p.ipad[i] = keybuf[i] ^ HMAC_IPAD;
75 h->p.opad[i] = keybuf[i] ^ HMAC_OPAD;
78 memset(keybuf, 0, bs);
81 px_md_update(md, h->p.ipad, bs);
85 hmac_reset(PX_HMAC *h)
88 unsigned bs = px_md_block_size(md);
91 px_md_update(md, h->p.ipad, bs);
95 hmac_update(PX_HMAC *h, const uint8 *data, unsigned dlen)
97 px_md_update(h->md, data, dlen);
101 hmac_finish(PX_HMAC *h, uint8 *dst)
108 bs = px_md_block_size(md);
109 hlen = px_md_result_size(md);
111 buf = px_alloc(hlen);
113 px_md_finish(md, buf);
116 px_md_update(md, h->p.opad, bs);
117 px_md_update(md, buf, hlen);
118 px_md_finish(md, dst);
120 memset(buf, 0, hlen);
125 hmac_free(PX_HMAC *h)
129 bs = px_md_block_size(h->md);
132 memset(h->p.ipad, 0, bs);
133 memset(h->p.opad, 0, bs);
140 /* PUBLIC FUNCTIONS */
143 px_find_hmac(const char *name, PX_HMAC **res)
150 err = px_find_digest(name, &md);
154 bs = px_md_block_size(md);
158 return PXE_HASH_UNUSABLE_FOR_HMAC;
161 h = px_alloc(sizeof(*h));
162 h->p.ipad = px_alloc(bs);
163 h->p.opad = px_alloc(bs);
166 h->result_size = hmac_result_size;
167 h->block_size = hmac_block_size;
168 h->reset = hmac_reset;
169 h->update = hmac_update;
170 h->finish = hmac_finish;