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
29static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
30				  int blocks)
31{
32	u32 temp[SHA_WORKSPACE_WORDS];
33
34	while (blocks--) {
35		sha_transform(sst->state, src, temp);
36		src += SHA1_BLOCK_SIZE;
37	}
38	memzero_explicit(temp, sizeof(temp));
39}
40
41int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
42		       unsigned int len)
43{
44	return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
45}
46EXPORT_SYMBOL(crypto_sha1_update);
47
48static int sha1_final(struct shash_desc *desc, u8 *out)
49{
50	sha1_base_do_finalize(desc, sha1_generic_block_fn);
51	return sha1_base_finish(desc, out);
52}
53
54int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
55		      unsigned int len, u8 *out)
56{
57	sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
58	return sha1_final(desc, out);
59}
60EXPORT_SYMBOL(crypto_sha1_finup);
61
62static struct shash_alg alg = {
63	.digestsize	=	SHA1_DIGEST_SIZE,
64	.init		=	sha1_base_init,
65	.update		=	crypto_sha1_update,
66	.final		=	sha1_final,
67	.finup		=	crypto_sha1_finup,
68	.descsize	=	sizeof(struct sha1_state),
69	.base		=	{
70		.cra_name	=	"sha1",
71		.cra_driver_name=	"sha1-generic",
72		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
73		.cra_blocksize	=	SHA1_BLOCK_SIZE,
74		.cra_module	=	THIS_MODULE,
75	}
76};
77
78static int __init sha1_generic_mod_init(void)
79{
80	return crypto_register_shash(&alg);
81}
82
83static void __exit sha1_generic_mod_fini(void)
84{
85	crypto_unregister_shash(&alg);
86}
87
88module_init(sha1_generic_mod_init);
89module_exit(sha1_generic_mod_fini);
90
91MODULE_LICENSE("GPL");
92MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
93
94MODULE_ALIAS_CRYPTO("sha1");
95MODULE_ALIAS_CRYPTO("sha1-generic");
96