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Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
54ccb367 | 19 | #include <crypto/internal/hash.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/module.h> | |
22 | #include <linux/mm.h> | |
1da177e4 | 23 | #include <linux/cryptohash.h> |
06ace7a9 | 24 | #include <linux/types.h> |
5265eeb2 | 25 | #include <crypto/sha.h> |
1da177e4 LT |
26 | #include <asm/byteorder.h> |
27 | ||
54ccb367 | 28 | static int sha1_init(struct shash_desc *desc) |
1da177e4 | 29 | { |
e2a7ce4e | 30 | struct sha1_state *sctx = shash_desc_ctx(desc); |
54ccb367 | 31 | |
e2a7ce4e HX |
32 | *sctx = (struct sha1_state){ |
33 | .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, | |
1da177e4 LT |
34 | }; |
35 | ||
54ccb367 | 36 | return 0; |
1da177e4 LT |
37 | } |
38 | ||
54ccb367 | 39 | static int sha1_update(struct shash_desc *desc, const u8 *data, |
6c2bb98b | 40 | unsigned int len) |
1da177e4 | 41 | { |
e2a7ce4e | 42 | struct sha1_state *sctx = shash_desc_ctx(desc); |
9d70a6c8 | 43 | unsigned int partial, done; |
cfa8d17c | 44 | const u8 *src; |
1da177e4 | 45 | |
36ca239b | 46 | partial = sctx->count % SHA1_BLOCK_SIZE; |
fa9b98fd | 47 | sctx->count += len; |
9d70a6c8 | 48 | done = 0; |
cfa8d17c | 49 | src = data; |
1da177e4 | 50 | |
36ca239b | 51 | if ((partial + len) >= SHA1_BLOCK_SIZE) { |
cfa8d17c NP |
52 | u32 temp[SHA_WORKSPACE_WORDS]; |
53 | ||
9d70a6c8 | 54 | if (partial) { |
bcb0ad2b | 55 | done = -partial; |
36ca239b MSB |
56 | memcpy(sctx->buffer + partial, data, |
57 | done + SHA1_BLOCK_SIZE); | |
cfa8d17c | 58 | src = sctx->buffer; |
1da177e4 | 59 | } |
cfa8d17c NP |
60 | |
61 | do { | |
62 | sha_transform(sctx->state, src, temp); | |
36ca239b | 63 | done += SHA1_BLOCK_SIZE; |
9d70a6c8 | 64 | src = data + done; |
36ca239b | 65 | } while (done + SHA1_BLOCK_SIZE <= len); |
cfa8d17c NP |
66 | |
67 | memset(temp, 0, sizeof(temp)); | |
9d70a6c8 | 68 | partial = 0; |
1da177e4 | 69 | } |
9d70a6c8 | 70 | memcpy(sctx->buffer + partial, src, len - done); |
54ccb367 AKR |
71 | |
72 | return 0; | |
1da177e4 LT |
73 | } |
74 | ||
75 | ||
76 | /* Add padding and return the message digest. */ | |
54ccb367 | 77 | static int sha1_final(struct shash_desc *desc, u8 *out) |
1da177e4 | 78 | { |
e2a7ce4e | 79 | struct sha1_state *sctx = shash_desc_ctx(desc); |
06ace7a9 HX |
80 | __be32 *dst = (__be32 *)out; |
81 | u32 i, index, padlen; | |
82 | __be64 bits; | |
1da177e4 LT |
83 | static const u8 padding[64] = { 0x80, }; |
84 | ||
fa9b98fd | 85 | bits = cpu_to_be64(sctx->count << 3); |
1da177e4 LT |
86 | |
87 | /* Pad out to 56 mod 64 */ | |
fa9b98fd | 88 | index = sctx->count & 0x3f; |
1da177e4 | 89 | padlen = (index < 56) ? (56 - index) : ((64+56) - index); |
54ccb367 | 90 | sha1_update(desc, padding, padlen); |
1da177e4 LT |
91 | |
92 | /* Append length */ | |
54ccb367 | 93 | sha1_update(desc, (const u8 *)&bits, sizeof(bits)); |
1da177e4 LT |
94 | |
95 | /* Store state in digest */ | |
06ace7a9 HX |
96 | for (i = 0; i < 5; i++) |
97 | dst[i] = cpu_to_be32(sctx->state[i]); | |
1da177e4 LT |
98 | |
99 | /* Wipe context */ | |
100 | memset(sctx, 0, sizeof *sctx); | |
54ccb367 AKR |
101 | |
102 | return 0; | |
1da177e4 LT |
103 | } |
104 | ||
e2a7ce4e HX |
105 | static 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 | ||
113 | static 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 | ||
54ccb367 AKR |
121 | static struct shash_alg alg = { |
122 | .digestsize = SHA1_DIGEST_SIZE, | |
123 | .init = sha1_init, | |
124 | .update = sha1_update, | |
125 | .final = sha1_final, | |
e2a7ce4e HX |
126 | .export = sha1_export, |
127 | .import = sha1_import, | |
128 | .descsize = sizeof(struct sha1_state), | |
129 | .statesize = sizeof(struct sha1_state), | |
54ccb367 AKR |
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 | } | |
1da177e4 LT |
137 | }; |
138 | ||
3af5b90b | 139 | static int __init sha1_generic_mod_init(void) |
1da177e4 | 140 | { |
54ccb367 | 141 | return crypto_register_shash(&alg); |
1da177e4 LT |
142 | } |
143 | ||
3af5b90b | 144 | static void __exit sha1_generic_mod_fini(void) |
1da177e4 | 145 | { |
54ccb367 | 146 | crypto_unregister_shash(&alg); |
1da177e4 LT |
147 | } |
148 | ||
3af5b90b KB |
149 | module_init(sha1_generic_mod_init); |
150 | module_exit(sha1_generic_mod_fini); | |
1da177e4 LT |
151 | |
152 | MODULE_LICENSE("GPL"); | |
153 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); | |
b3be9a6d | 154 | |
ad5d2789 | 155 | MODULE_ALIAS("sha1"); |