xref: /freebsd/sys/dev/random/hash.h (revision b3e7694832e81d7a904a10f525f8797b753bf0d3)
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 #ifndef SYS_DEV_RANDOM_HASH_H_INCLUDED
28 #define	SYS_DEV_RANDOM_HASH_H_INCLUDED
29 
30 #include <crypto/chacha20/_chacha.h>
31 #include <dev/random/uint128.h>
32 
33 #ifndef _KERNEL
34 #define	__read_frequently
35 #endif
36 
37 /* Keys are formed from cipher blocks */
38 #define	RANDOM_KEYSIZE		32	/* (in bytes) == 256 bits */
39 #define	RANDOM_KEYSIZE_WORDS	(RANDOM_KEYSIZE/sizeof(uint32_t))
40 #define	RANDOM_BLOCKSIZE	16	/* (in bytes) == 128 bits */
41 #define	RANDOM_BLOCKSIZE_WORDS	(RANDOM_BLOCKSIZE/sizeof(uint32_t))
42 #define	RANDOM_KEYS_PER_BLOCK	(RANDOM_KEYSIZE/RANDOM_BLOCKSIZE)
43 
44 /* The size of the zero block portion used to form H_d(m) */
45 #define	RANDOM_ZERO_BLOCKSIZE	64	/* (in bytes) == 512 zero bits */
46 
47 struct randomdev_hash {
48 	SHA256_CTX	sha;
49 };
50 
51 union randomdev_key {
52 	struct {
53 		keyInstance key;	/* Key schedule */
54 		cipherInstance cipher;	/* Rijndael internal */
55 	};
56 	struct chacha_ctx chacha;
57 };
58 
59 extern bool random_chachamode;
60 
61 void randomdev_hash_init(struct randomdev_hash *);
62 void randomdev_hash_iterate(struct randomdev_hash *, const void *, size_t);
63 void randomdev_hash_finish(struct randomdev_hash *, void *);
64 
65 void randomdev_encrypt_init(union randomdev_key *, const void *);
66 void randomdev_keystream(union randomdev_key *context, uint128_t *, void *, size_t);
67 void randomdev_getkey(union randomdev_key *, const void **, size_t *);
68 
69 #endif /* SYS_DEV_RANDOM_HASH_H_INCLUDED */
70