1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Cryptographic API.
4 *
5 * SHA1 Secure Hash Algorithm.
6 *
7 * Derived from cryptoapi implementation, adapted for in-place
8 * scatterlist interface.
9 *
10 * Copyright (c) Alan Smithee.
11 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
12 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
13 */
14 #include <crypto/internal/hash.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/mm.h>
18 #include <linux/cryptohash.h>
19 #include <linux/types.h>
20 #include <crypto/sha.h>
21 #include <crypto/sha1_base.h>
22 #include <asm/byteorder.h>
23
24 const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
25 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
26 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
27 0xaf, 0xd8, 0x07, 0x09
28 };
29 EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
30
sha1_generic_block_fn(struct sha1_state * sst,u8 const * src,int blocks)31 static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
32 int blocks)
33 {
34 u32 temp[SHA_WORKSPACE_WORDS];
35
36 while (blocks--) {
37 sha_transform(sst->state, src, temp);
38 src += SHA1_BLOCK_SIZE;
39 }
40 memzero_explicit(temp, sizeof(temp));
41 }
42
crypto_sha1_update(struct shash_desc * desc,const u8 * data,unsigned int len)43 int crypto_sha1_update(struct shash_desc *desc, const u8 *data,
44 unsigned int len)
45 {
46 return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
47 }
48 EXPORT_SYMBOL(crypto_sha1_update);
49
sha1_final(struct shash_desc * desc,u8 * out)50 static int sha1_final(struct shash_desc *desc, u8 *out)
51 {
52 sha1_base_do_finalize(desc, sha1_generic_block_fn);
53 return sha1_base_finish(desc, out);
54 }
55
crypto_sha1_finup(struct shash_desc * desc,const u8 * data,unsigned int len,u8 * out)56 int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
57 unsigned int len, u8 *out)
58 {
59 sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
60 return sha1_final(desc, out);
61 }
62 EXPORT_SYMBOL(crypto_sha1_finup);
63
64 static struct shash_alg alg = {
65 .digestsize = SHA1_DIGEST_SIZE,
66 .init = sha1_base_init,
67 .update = crypto_sha1_update,
68 .final = sha1_final,
69 .finup = crypto_sha1_finup,
70 .descsize = sizeof(struct sha1_state),
71 .base = {
72 .cra_name = "sha1",
73 .cra_driver_name= "sha1-generic",
74 .cra_priority = 100,
75 .cra_blocksize = SHA1_BLOCK_SIZE,
76 .cra_module = THIS_MODULE,
77 }
78 };
79
sha1_generic_mod_init(void)80 static int __init sha1_generic_mod_init(void)
81 {
82 return crypto_register_shash(&alg);
83 }
84
sha1_generic_mod_fini(void)85 static void __exit sha1_generic_mod_fini(void)
86 {
87 crypto_unregister_shash(&alg);
88 }
89
90 subsys_initcall(sha1_generic_mod_init);
91 module_exit(sha1_generic_mod_fini);
92
93 MODULE_LICENSE("GPL");
94 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
95
96 MODULE_ALIAS_CRYPTO("sha1");
97 MODULE_ALIAS_CRYPTO("sha1-generic");
98
