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 | */ | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/crypto.h> | |
23 | #include <linux/cryptohash.h> | |
06ace7a9 | 24 | #include <linux/types.h> |
5265eeb2 | 25 | #include <crypto/sha.h> |
1da177e4 LT |
26 | #include <asm/scatterlist.h> |
27 | #include <asm/byteorder.h> | |
28 | ||
1da177e4 LT |
29 | struct sha1_ctx { |
30 | u64 count; | |
31 | u32 state[5]; | |
32 | u8 buffer[64]; | |
33 | }; | |
34 | ||
6c2bb98b | 35 | static void sha1_init(struct crypto_tfm *tfm) |
1da177e4 | 36 | { |
6c2bb98b | 37 | struct sha1_ctx *sctx = crypto_tfm_ctx(tfm); |
1da177e4 LT |
38 | static const struct sha1_ctx initstate = { |
39 | 0, | |
5265eeb2 | 40 | { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, |
1da177e4 LT |
41 | { 0, } |
42 | }; | |
43 | ||
44 | *sctx = initstate; | |
45 | } | |
46 | ||
6c2bb98b HX |
47 | static void sha1_update(struct crypto_tfm *tfm, const u8 *data, |
48 | unsigned int len) | |
1da177e4 | 49 | { |
6c2bb98b | 50 | struct sha1_ctx *sctx = crypto_tfm_ctx(tfm); |
9d70a6c8 | 51 | unsigned int partial, done; |
cfa8d17c | 52 | const u8 *src; |
1da177e4 | 53 | |
fa9b98fd NP |
54 | partial = sctx->count & 0x3f; |
55 | sctx->count += len; | |
9d70a6c8 | 56 | done = 0; |
cfa8d17c | 57 | src = data; |
1da177e4 | 58 | |
9d70a6c8 | 59 | if ((partial + len) > 63) { |
cfa8d17c NP |
60 | u32 temp[SHA_WORKSPACE_WORDS]; |
61 | ||
9d70a6c8 | 62 | if (partial) { |
bcb0ad2b HX |
63 | done = -partial; |
64 | memcpy(sctx->buffer + partial, data, done + 64); | |
cfa8d17c | 65 | src = sctx->buffer; |
1da177e4 | 66 | } |
cfa8d17c NP |
67 | |
68 | do { | |
69 | sha_transform(sctx->state, src, temp); | |
9d70a6c8 NP |
70 | done += 64; |
71 | src = data + done; | |
72 | } while (done + 63 < len); | |
cfa8d17c NP |
73 | |
74 | memset(temp, 0, sizeof(temp)); | |
9d70a6c8 | 75 | partial = 0; |
1da177e4 | 76 | } |
9d70a6c8 | 77 | memcpy(sctx->buffer + partial, src, len - done); |
1da177e4 LT |
78 | } |
79 | ||
80 | ||
81 | /* Add padding and return the message digest. */ | |
6c2bb98b | 82 | static void sha1_final(struct crypto_tfm *tfm, u8 *out) |
1da177e4 | 83 | { |
6c2bb98b | 84 | struct sha1_ctx *sctx = crypto_tfm_ctx(tfm); |
06ace7a9 HX |
85 | __be32 *dst = (__be32 *)out; |
86 | u32 i, index, padlen; | |
87 | __be64 bits; | |
1da177e4 LT |
88 | static const u8 padding[64] = { 0x80, }; |
89 | ||
fa9b98fd | 90 | bits = cpu_to_be64(sctx->count << 3); |
1da177e4 LT |
91 | |
92 | /* Pad out to 56 mod 64 */ | |
fa9b98fd | 93 | index = sctx->count & 0x3f; |
1da177e4 | 94 | padlen = (index < 56) ? (56 - index) : ((64+56) - index); |
6c2bb98b | 95 | sha1_update(tfm, padding, padlen); |
1da177e4 LT |
96 | |
97 | /* Append length */ | |
6c2bb98b | 98 | sha1_update(tfm, (const u8 *)&bits, sizeof(bits)); |
1da177e4 LT |
99 | |
100 | /* Store state in digest */ | |
06ace7a9 HX |
101 | for (i = 0; i < 5; i++) |
102 | dst[i] = cpu_to_be32(sctx->state[i]); | |
1da177e4 LT |
103 | |
104 | /* Wipe context */ | |
105 | memset(sctx, 0, sizeof *sctx); | |
106 | } | |
107 | ||
108 | static struct crypto_alg alg = { | |
109 | .cra_name = "sha1", | |
b3be9a6d | 110 | .cra_driver_name= "sha1-generic", |
1da177e4 | 111 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
5265eeb2 | 112 | .cra_blocksize = SHA1_BLOCK_SIZE, |
1da177e4 LT |
113 | .cra_ctxsize = sizeof(struct sha1_ctx), |
114 | .cra_module = THIS_MODULE, | |
e1147d8f | 115 | .cra_alignmask = 3, |
1da177e4 LT |
116 | .cra_list = LIST_HEAD_INIT(alg.cra_list), |
117 | .cra_u = { .digest = { | |
118 | .dia_digestsize = SHA1_DIGEST_SIZE, | |
119 | .dia_init = sha1_init, | |
120 | .dia_update = sha1_update, | |
121 | .dia_final = sha1_final } } | |
122 | }; | |
123 | ||
124 | static int __init init(void) | |
125 | { | |
126 | return crypto_register_alg(&alg); | |
127 | } | |
128 | ||
129 | static void __exit fini(void) | |
130 | { | |
131 | crypto_unregister_alg(&alg); | |
132 | } | |
133 | ||
134 | module_init(init); | |
135 | module_exit(fini); | |
136 | ||
137 | MODULE_LICENSE("GPL"); | |
138 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); | |
b3be9a6d | 139 | |
ad5d2789 | 140 | MODULE_ALIAS("sha1"); |