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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
29const 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};
34EXPORT_SYMBOL_GPL(sha1_zero_message_hash);
35
36static 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
48int 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}
53EXPORT_SYMBOL(crypto_sha1_update);
54
55static 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
61int 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}
67EXPORT_SYMBOL(crypto_sha1_finup);
68
69static 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
85static int __init sha1_generic_mod_init(void)
86{
87 return crypto_register_shash(&alg);
88}
89
90static void __exit sha1_generic_mod_fini(void)
91{
92 crypto_unregister_shash(&alg);
93}
94
95module_init(sha1_generic_mod_init);
96module_exit(sha1_generic_mod_fini);
97
98MODULE_LICENSE("GPL");
99MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
100
101MODULE_ALIAS_CRYPTO("sha1");
102MODULE_ALIAS_CRYPTO("sha1-generic");
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 <asm/byteorder.h>
27
28static int sha1_init(struct shash_desc *desc)
29{
30 struct sha1_state *sctx = shash_desc_ctx(desc);
31
32 *sctx = (struct sha1_state){
33 .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 },
34 };
35
36 return 0;
37}
38
39static int sha1_update(struct shash_desc *desc, const u8 *data,
40 unsigned int len)
41{
42 struct sha1_state *sctx = shash_desc_ctx(desc);
43 unsigned int partial, done;
44 const u8 *src;
45
46 partial = sctx->count % SHA1_BLOCK_SIZE;
47 sctx->count += len;
48 done = 0;
49 src = data;
50
51 if ((partial + len) >= SHA1_BLOCK_SIZE) {
52 u32 temp[SHA_WORKSPACE_WORDS];
53
54 if (partial) {
55 done = -partial;
56 memcpy(sctx->buffer + partial, data,
57 done + SHA1_BLOCK_SIZE);
58 src = sctx->buffer;
59 }
60
61 do {
62 sha_transform(sctx->state, src, temp);
63 done += SHA1_BLOCK_SIZE;
64 src = data + done;
65 } while (done + SHA1_BLOCK_SIZE <= len);
66
67 memset(temp, 0, sizeof(temp));
68 partial = 0;
69 }
70 memcpy(sctx->buffer + partial, src, len - done);
71
72 return 0;
73}
74
75
76/* Add padding and return the message digest. */
77static int sha1_final(struct shash_desc *desc, u8 *out)
78{
79 struct sha1_state *sctx = shash_desc_ctx(desc);
80 __be32 *dst = (__be32 *)out;
81 u32 i, index, padlen;
82 __be64 bits;
83 static const u8 padding[64] = { 0x80, };
84
85 bits = cpu_to_be64(sctx->count << 3);
86
87 /* Pad out to 56 mod 64 */
88 index = sctx->count & 0x3f;
89 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
90 sha1_update(desc, padding, padlen);
91
92 /* Append length */
93 sha1_update(desc, (const u8 *)&bits, sizeof(bits));
94
95 /* Store state in digest */
96 for (i = 0; i < 5; i++)
97 dst[i] = cpu_to_be32(sctx->state[i]);
98
99 /* Wipe context */
100 memset(sctx, 0, sizeof *sctx);
101
102 return 0;
103}
104
105static int sha1_export(struct shash_desc *desc, void *out)
106{
107 struct sha1_state *sctx = shash_desc_ctx(desc);
108
109 memcpy(out, sctx, sizeof(*sctx));
110 return 0;
111}
112
113static int sha1_import(struct shash_desc *desc, const void *in)
114{
115 struct sha1_state *sctx = shash_desc_ctx(desc);
116
117 memcpy(sctx, in, sizeof(*sctx));
118 return 0;
119}
120
121static struct shash_alg alg = {
122 .digestsize = SHA1_DIGEST_SIZE,
123 .init = sha1_init,
124 .update = sha1_update,
125 .final = sha1_final,
126 .export = sha1_export,
127 .import = sha1_import,
128 .descsize = sizeof(struct sha1_state),
129 .statesize = sizeof(struct sha1_state),
130 .base = {
131 .cra_name = "sha1",
132 .cra_driver_name= "sha1-generic",
133 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
134 .cra_blocksize = SHA1_BLOCK_SIZE,
135 .cra_module = THIS_MODULE,
136 }
137};
138
139static int __init sha1_generic_mod_init(void)
140{
141 return crypto_register_shash(&alg);
142}
143
144static void __exit sha1_generic_mod_fini(void)
145{
146 crypto_unregister_shash(&alg);
147}
148
149module_init(sha1_generic_mod_init);
150module_exit(sha1_generic_mod_fini);
151
152MODULE_LICENSE("GPL");
153MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");
154
155MODULE_ALIAS("sha1");