hash.c revision 255362 
1/*-
2 * Copyright (c) 2000-2013 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: head/sys/dev/random/hash.c 255362 2013-09-07 14:15:13Z markm $");
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 */
40void
41randomdev_hash_init(struct randomdev_hash *context)
42{
43	SHA256_Init(&context->sha);
44}
45
46/* Iterate the hash */
47void
48randomdev_hash_iterate(struct randomdev_hash *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 */
56void
57randomdev_hash_finish(struct randomdev_hash *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. Use CBC mode for better avalanche.
65 */
66void
67randomdev_encrypt_init(struct randomdev_key *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 * <length> bytes are encrypted from <*d_in> to <*d_out>. <length> must be
75 * a multiple of BLOCKSIZE.
76 */
77void
78randomdev_encrypt(struct randomdev_key *context, void *d_in, void *d_out, unsigned length)
79{
80	rijndael_blockEncrypt(&context->cipher, &context->key, d_in, length*8, d_out);
81}
82