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323a6bf1 ME |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * powerpc implementation of the SHA1 Secure Hash Algorithm. | |
5 | * | |
6 | * Derived from cryptoapi implementation, adapted for in-place | |
7 | * scatterlist interface. | |
8 | * | |
9 | * Derived from "crypto/sha1.c" | |
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 | * This program is free software; you can redistribute it and/or modify it | |
15 | * under the terms of the GNU General Public License as published by the Free | |
16 | * Software Foundation; either version 2 of the License, or (at your option) | |
17 | * any later version. | |
18 | * | |
19 | */ | |
20 | #include <crypto/internal/hash.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/cryptohash.h> | |
25 | #include <linux/types.h> | |
26 | #include <crypto/sha.h> | |
27 | #include <asm/byteorder.h> | |
28 | ||
29 | extern void powerpc_sha_transform(u32 *state, const u8 *src, u32 *temp); | |
30 | ||
31 | static int sha1_init(struct shash_desc *desc) | |
32 | { | |
33 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
34 | ||
35 | *sctx = (struct sha1_state){ | |
36 | .state = { SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4 }, | |
37 | }; | |
38 | ||
39 | return 0; | |
40 | } | |
41 | ||
42 | static int sha1_update(struct shash_desc *desc, const u8 *data, | |
43 | unsigned int len) | |
44 | { | |
45 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
46 | unsigned int partial, done; | |
47 | const u8 *src; | |
48 | ||
49 | partial = sctx->count & 0x3f; | |
50 | sctx->count += len; | |
51 | done = 0; | |
52 | src = data; | |
53 | ||
54 | if ((partial + len) > 63) { | |
55 | u32 temp[SHA_WORKSPACE_WORDS]; | |
56 | ||
57 | if (partial) { | |
58 | done = -partial; | |
59 | memcpy(sctx->buffer + partial, data, done + 64); | |
60 | src = sctx->buffer; | |
61 | } | |
62 | ||
63 | do { | |
64 | powerpc_sha_transform(sctx->state, src, temp); | |
65 | done += 64; | |
66 | src = data + done; | |
67 | } while (done + 63 < len); | |
68 | ||
d83480b0 | 69 | memzero_explicit(temp, sizeof(temp)); |
323a6bf1 ME |
70 | partial = 0; |
71 | } | |
72 | memcpy(sctx->buffer + partial, src, len - done); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | ||
78 | /* Add padding and return the message digest. */ | |
79 | static int sha1_final(struct shash_desc *desc, u8 *out) | |
80 | { | |
81 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
82 | __be32 *dst = (__be32 *)out; | |
83 | u32 i, index, padlen; | |
84 | __be64 bits; | |
85 | static const u8 padding[64] = { 0x80, }; | |
86 | ||
87 | bits = cpu_to_be64(sctx->count << 3); | |
88 | ||
89 | /* Pad out to 56 mod 64 */ | |
90 | index = sctx->count & 0x3f; | |
91 | padlen = (index < 56) ? (56 - index) : ((64+56) - index); | |
92 | sha1_update(desc, padding, padlen); | |
93 | ||
94 | /* Append length */ | |
95 | sha1_update(desc, (const u8 *)&bits, sizeof(bits)); | |
96 | ||
97 | /* Store state in digest */ | |
98 | for (i = 0; i < 5; i++) | |
99 | dst[i] = cpu_to_be32(sctx->state[i]); | |
100 | ||
101 | /* Wipe context */ | |
102 | memset(sctx, 0, sizeof *sctx); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static int sha1_export(struct shash_desc *desc, void *out) | |
108 | { | |
109 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
110 | ||
111 | memcpy(out, sctx, sizeof(*sctx)); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static int sha1_import(struct shash_desc *desc, const void *in) | |
116 | { | |
117 | struct sha1_state *sctx = shash_desc_ctx(desc); | |
118 | ||
119 | memcpy(sctx, in, sizeof(*sctx)); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static struct shash_alg alg = { | |
124 | .digestsize = SHA1_DIGEST_SIZE, | |
125 | .init = sha1_init, | |
126 | .update = sha1_update, | |
127 | .final = sha1_final, | |
128 | .export = sha1_export, | |
129 | .import = sha1_import, | |
130 | .descsize = sizeof(struct sha1_state), | |
131 | .statesize = sizeof(struct sha1_state), | |
132 | .base = { | |
133 | .cra_name = "sha1", | |
134 | .cra_driver_name= "sha1-powerpc", | |
135 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
136 | .cra_blocksize = SHA1_BLOCK_SIZE, | |
137 | .cra_module = THIS_MODULE, | |
138 | } | |
139 | }; | |
140 | ||
141 | static int __init sha1_powerpc_mod_init(void) | |
142 | { | |
143 | return crypto_register_shash(&alg); | |
144 | } | |
145 | ||
146 | static void __exit sha1_powerpc_mod_fini(void) | |
147 | { | |
148 | crypto_unregister_shash(&alg); | |
149 | } | |
150 | ||
151 | module_init(sha1_powerpc_mod_init); | |
152 | module_exit(sha1_powerpc_mod_fini); | |
153 | ||
154 | MODULE_LICENSE("GPL"); | |
155 | MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm"); | |
156 | ||
3e14dcf7 | 157 | MODULE_ALIAS_CRYPTO("sha1"); |
5d26a105 | 158 | MODULE_ALIAS_CRYPTO("sha1-powerpc"); |