Merge tag 'kvm-arm-for-v4.12-round2' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-block.git] / crypto / sha1_generic.c
1 /*
2  * Cryptographic API.
3  *
4  * SHA1 Secure Hash Algorithm.
5  *
6  * Derived from cryptoapi implementation, adapted for in-place
7  * scatterlist interface.
8  *
9  * Copyright (c) Alan Smithee.
10  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
11  * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
12  *
13  * This program is free software; you can redistribute it and/or modify it
14  * under the terms of the GNU General Public License as published by the Free
15  * Software Foundation; either version 2 of the License, or (at your option)
16  * any later version.
17  *
18  */
19 #include <crypto/internal/hash.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/cryptohash.h>
24 #include <linux/types.h>
25 #include <crypto/sha.h>
26 #include <crypto/sha1_base.h>
27 #include <asm/byteorder.h>
28
29 const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
30         0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
31         0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
32         0xaf, 0xd8, 0x07, 0x09
33 };
34 EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
35
36 static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
37                                   int blocks)
38 {
39         u32 temp[SHA_WORKSPACE_WORDS];
40
41         while (blocks--) {
42                 sha_transform(sst->state, src, temp);
43                 src += SHA1_BLOCK_SIZE;
44         }
45         memzero_explicit(temp, sizeof(temp));
46 }
47
48 int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
49                        unsigned int len)
50 {
51         return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
52 }
53 EXPORT_SYMBOL(crypto_sha1_update);
54
55 static int sha1_final(struct shash_desc *desc, u8 *out)
56 {
57         sha1_base_do_finalize(desc, sha1_generic_block_fn);
58         return sha1_base_finish(desc, out);
59 }
60
61 int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
62                       unsigned int len, u8 *out)
63 {
64         sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
65         return sha1_final(desc, out);
66 }
67 EXPORT_SYMBOL(crypto_sha1_finup);
68
69 static struct shash_alg alg = {
70         .digestsize     =       SHA1_DIGEST_SIZE,
71         .init           =       sha1_base_init,
72         .update         =       crypto_sha1_update,
73         .final          =       sha1_final,
74         .finup          =       crypto_sha1_finup,
75         .descsize       =       sizeof(struct sha1_state),
76         .base           =       {
77                 .cra_name       =       "sha1",
78                 .cra_driver_name=       "sha1-generic",
79                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
80                 .cra_blocksize  =       SHA1_BLOCK_SIZE,
81                 .cra_module     =       THIS_MODULE,
82         }
83 };
84
85 static int __init sha1_generic_mod_init(void)
86 {
87         return crypto_register_shash(&alg);
88 }
89
90 static void __exit sha1_generic_mod_fini(void)
91 {
92         crypto_unregister_shash(&alg);
93 }
94
95 module_init(sha1_generic_mod_init);
96 module_exit(sha1_generic_mod_fini);
97
98 MODULE_LICENSE("GPL");
99 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
100
101 MODULE_ALIAS_CRYPTO("sha1");
102 MODULE_ALIAS_CRYPTO("sha1-generic");