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 
sha1_generic_block_fn(struct sha1_state * sst,u8 const * src,int blocks)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 
crypto_sha1_update(struct shash_desc * desc,const u8 * data,unsigned int len)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 
sha1_final(struct shash_desc * desc,u8 * out)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 
crypto_sha1_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)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_priority	=	100,
80 		.cra_blocksize	=	SHA1_BLOCK_SIZE,
81 		.cra_module	=	THIS_MODULE,
82 	}
83 };
84 
sha1_generic_mod_init(void)85 static int __init sha1_generic_mod_init(void)
86 {
87 	return crypto_register_shash(&alg);
88 }
89 
sha1_generic_mod_fini(void)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");
103