xref: /freebsd/sys/dev/random/hash.c (revision 71fe318b852b8dfb3e799cb12ef184750f7f8eac)
1 /*-
2  * Copyright (c) 2000 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  * $FreeBSD$
27  */
28 
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 
32 #include <crypto/rijndael/rijndael.h>
33 #include <crypto/sha2/sha2.h>
34 
35 #include <dev/random/hash.h>
36 
37 /* initialise the hash */
38 void
39 yarrow_hash_init(struct yarrowhash *context)
40 {
41 	SHA256_Init(&context->sha);
42 }
43 
44 /* iterate the hash */
45 void
46 yarrow_hash_iterate(struct yarrowhash *context, void *data, size_t size)
47 {
48 	SHA256_Update(&context->sha, data, size);
49 }
50 
51 /* Conclude by returning the hash in the supplied /buf/ which must be
52  * KEYSIZE bytes long.
53  */
54 void
55 yarrow_hash_finish(struct yarrowhash *context, void *buf)
56 {
57 	SHA256_Final(buf, &context->sha);
58 }
59 
60 /* Initialise the encryption routine by setting up the key schedule
61  * from the supplied /data/ which must be KEYSIZE bytes of binary
62  * data.
63  */
64 void
65 yarrow_encrypt_init(struct yarrowkey *context, void *data)
66 {
67 	rijndael_cipherInit(&context->cipher, MODE_CBC, NULL);
68 	rijndael_makeKey(&context->key, DIR_ENCRYPT, KEYSIZE*8, data);
69 }
70 
71 /* Encrypt the supplied data using the key schedule preset in the context.
72  * KEYSIZE bytes are encrypted from /d_in/ to /d_out/.
73  */
74 void
75 yarrow_encrypt(struct yarrowkey *context, void *d_in, void *d_out)
76 {
77 	rijndael_blockEncrypt(&context->cipher, &context->key, d_in,
78 	    KEYSIZE*8, d_out);
79 }
80