1/*-
2 * Copyright (c) 2000-2015 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/11.0/sys/dev/random/hash.c 292782 2015-12-27 17:33:59Z allanjude $");
30
31#ifdef _KERNEL
32#include <sys/param.h>
33#include <sys/systm.h>
34#else /* !_KERNEL */
35#include <sys/param.h>
36#include <sys/types.h>
37#include <inttypes.h>
38#include <stdio.h>
39#include <stdlib.h>
40#include <string.h>
41#include <threads.h>
42#include "unit_test.h"
43#endif /* _KERNEL */
44
45#include <crypto/rijndael/rijndael-api-fst.h>
46#include <crypto/sha2/sha256.h>
47
48#include <dev/random/hash.h>
49
50/* This code presumes that RANDOM_KEYSIZE is twice as large as RANDOM_BLOCKSIZE */
51CTASSERT(RANDOM_KEYSIZE == 2*RANDOM_BLOCKSIZE);
52
53/* Initialise the hash */
54void
55randomdev_hash_init(struct randomdev_hash *context)
56{
57
58	SHA256_Init(&context->sha);
59}
60
61/* Iterate the hash */
62void
63randomdev_hash_iterate(struct randomdev_hash *context, const void *data, size_t size)
64{
65
66	SHA256_Update(&context->sha, data, size);
67}
68
69/* Conclude by returning the hash in the supplied <*buf> which must be
70 * RANDOM_KEYSIZE bytes long.
71 */
72void
73randomdev_hash_finish(struct randomdev_hash *context, void *buf)
74{
75
76	SHA256_Final(buf, &context->sha);
77}
78
79/* Initialise the encryption routine by setting up the key schedule
80 * from the supplied <*data> which must be RANDOM_KEYSIZE bytes of binary
81 * data.
82 */
83void
84randomdev_encrypt_init(struct randomdev_key *context, const void *data)
85{
86
87	rijndael_cipherInit(&context->cipher, MODE_ECB, NULL);
88	rijndael_makeKey(&context->key, DIR_ENCRYPT, RANDOM_KEYSIZE*8, data);
89}
90
91/* Encrypt the supplied data using the key schedule preset in the context.
92 * <length> bytes are encrypted from <*d_in> to <*d_out>. <length> must be
93 * a multiple of RANDOM_BLOCKSIZE.
94 */
95void
96randomdev_encrypt(struct randomdev_key *context, const void *d_in, void *d_out, u_int length)
97{
98
99	rijndael_blockEncrypt(&context->cipher, &context->key, d_in, length*8, d_out);
100}
101