FreeBSD/Linux Kernel Cross Reference
sys/dev/random/hash.c
1 /*-
2 * Copyright (c) 2000-2004 Mark R V Murray
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD: releng/8.1/sys/dev/random/hash.c 143418 2005-03-11 15:42:51Z ume $");
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33
34 #include <crypto/rijndael/rijndael-api-fst.h>
35 #include <crypto/sha2/sha2.h>
36
37 #include <dev/random/hash.h>
38
39 /* initialise the hash */
40 void
41 yarrow_hash_init(struct yarrowhash *context)
42 {
43 SHA256_Init(&context->sha);
44 }
45
46 /* iterate the hash */
47 void
48 yarrow_hash_iterate(struct yarrowhash *context, void *data, size_t size)
49 {
50 SHA256_Update(&context->sha, data, size);
51 }
52
53 /* Conclude by returning the hash in the supplied /buf/ which must be
54 * KEYSIZE bytes long.
55 */
56 void
57 yarrow_hash_finish(struct yarrowhash *context, void *buf)
58 {
59 SHA256_Final(buf, &context->sha);
60 }
61
62 /* Initialise the encryption routine by setting up the key schedule
63 * from the supplied /data/ which must be KEYSIZE bytes of binary
64 * data.
65 */
66 void
67 yarrow_encrypt_init(struct yarrowkey *context, void *data)
68 {
69 rijndael_cipherInit(&context->cipher, MODE_CBC, NULL);
70 rijndael_makeKey(&context->key, DIR_ENCRYPT, KEYSIZE*8, data);
71 }
72
73 /* Encrypt the supplied data using the key schedule preset in the context.
74 * KEYSIZE bytes are encrypted from /d_in/ to /d_out/.
75 */
76 void
77 yarrow_encrypt(struct yarrowkey *context, void *d_in, void *d_out)
78 {
79 rijndael_blockEncrypt(&context->cipher, &context->key, d_in,
80 KEYSIZE*8, d_out);
81 }
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