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