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Source at commit 2604e7f9a98c27be50a0c3ff7503b6a5ea8f6cfe created 12 years 7 months ago. By Maarten ter Huurne, cpufreq_stats: Support runtime changes to frequency table | |
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1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * MD5 Message Digest Algorithm (RFC1321). |
5 | * |
6 | * Derived from cryptoapi implementation, originally based on the |
7 | * public domain implementation written by Colin Plumb in 1993. |
8 | * |
9 | * Copyright (c) Cryptoapi developers. |
10 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify it |
13 | * under the terms of the GNU General Public License as published by the Free |
14 | * Software Foundation; either version 2 of the License, or (at your option) |
15 | * any later version. |
16 | * |
17 | */ |
18 | #include <crypto/internal/hash.h> |
19 | #include <crypto/md5.h> |
20 | #include <linux/init.h> |
21 | #include <linux/module.h> |
22 | #include <linux/string.h> |
23 | #include <linux/types.h> |
24 | #include <linux/cryptohash.h> |
25 | #include <asm/byteorder.h> |
26 | |
27 | /* XXX: this stuff can be optimized */ |
28 | static inline void le32_to_cpu_array(u32 *buf, unsigned int words) |
29 | { |
30 | while (words--) { |
31 | __le32_to_cpus(buf); |
32 | buf++; |
33 | } |
34 | } |
35 | |
36 | static inline void cpu_to_le32_array(u32 *buf, unsigned int words) |
37 | { |
38 | while (words--) { |
39 | __cpu_to_le32s(buf); |
40 | buf++; |
41 | } |
42 | } |
43 | |
44 | static inline void md5_transform_helper(struct md5_state *ctx) |
45 | { |
46 | le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); |
47 | md5_transform(ctx->hash, ctx->block); |
48 | } |
49 | |
50 | static int md5_init(struct shash_desc *desc) |
51 | { |
52 | struct md5_state *mctx = shash_desc_ctx(desc); |
53 | |
54 | mctx->hash[0] = 0x67452301; |
55 | mctx->hash[1] = 0xefcdab89; |
56 | mctx->hash[2] = 0x98badcfe; |
57 | mctx->hash[3] = 0x10325476; |
58 | mctx->byte_count = 0; |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
64 | { |
65 | struct md5_state *mctx = shash_desc_ctx(desc); |
66 | const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); |
67 | |
68 | mctx->byte_count += len; |
69 | |
70 | if (avail > len) { |
71 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
72 | data, len); |
73 | return 0; |
74 | } |
75 | |
76 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
77 | data, avail); |
78 | |
79 | md5_transform_helper(mctx); |
80 | data += avail; |
81 | len -= avail; |
82 | |
83 | while (len >= sizeof(mctx->block)) { |
84 | memcpy(mctx->block, data, sizeof(mctx->block)); |
85 | md5_transform_helper(mctx); |
86 | data += sizeof(mctx->block); |
87 | len -= sizeof(mctx->block); |
88 | } |
89 | |
90 | memcpy(mctx->block, data, len); |
91 | |
92 | return 0; |
93 | } |
94 | |
95 | static int md5_final(struct shash_desc *desc, u8 *out) |
96 | { |
97 | struct md5_state *mctx = shash_desc_ctx(desc); |
98 | const unsigned int offset = mctx->byte_count & 0x3f; |
99 | char *p = (char *)mctx->block + offset; |
100 | int padding = 56 - (offset + 1); |
101 | |
102 | *p++ = 0x80; |
103 | if (padding < 0) { |
104 | memset(p, 0x00, padding + sizeof (u64)); |
105 | md5_transform_helper(mctx); |
106 | p = (char *)mctx->block; |
107 | padding = 56; |
108 | } |
109 | |
110 | memset(p, 0, padding); |
111 | mctx->block[14] = mctx->byte_count << 3; |
112 | mctx->block[15] = mctx->byte_count >> 29; |
113 | le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - |
114 | sizeof(u64)) / sizeof(u32)); |
115 | md5_transform(mctx->hash, mctx->block); |
116 | cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32)); |
117 | memcpy(out, mctx->hash, sizeof(mctx->hash)); |
118 | memset(mctx, 0, sizeof(*mctx)); |
119 | |
120 | return 0; |
121 | } |
122 | |
123 | static int md5_export(struct shash_desc *desc, void *out) |
124 | { |
125 | struct md5_state *ctx = shash_desc_ctx(desc); |
126 | |
127 | memcpy(out, ctx, sizeof(*ctx)); |
128 | return 0; |
129 | } |
130 | |
131 | static int md5_import(struct shash_desc *desc, const void *in) |
132 | { |
133 | struct md5_state *ctx = shash_desc_ctx(desc); |
134 | |
135 | memcpy(ctx, in, sizeof(*ctx)); |
136 | return 0; |
137 | } |
138 | |
139 | static struct shash_alg alg = { |
140 | .digestsize = MD5_DIGEST_SIZE, |
141 | .init = md5_init, |
142 | .update = md5_update, |
143 | .final = md5_final, |
144 | .export = md5_export, |
145 | .import = md5_import, |
146 | .descsize = sizeof(struct md5_state), |
147 | .statesize = sizeof(struct md5_state), |
148 | .base = { |
149 | .cra_name = "md5", |
150 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
151 | .cra_blocksize = MD5_HMAC_BLOCK_SIZE, |
152 | .cra_module = THIS_MODULE, |
153 | } |
154 | }; |
155 | |
156 | static int __init md5_mod_init(void) |
157 | { |
158 | return crypto_register_shash(&alg); |
159 | } |
160 | |
161 | static void __exit md5_mod_fini(void) |
162 | { |
163 | crypto_unregister_shash(&alg); |
164 | } |
165 | |
166 | module_init(md5_mod_init); |
167 | module_exit(md5_mod_fini); |
168 | |
169 | MODULE_LICENSE("GPL"); |
170 | MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); |
171 |
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