Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/crypto/md5.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 7285 byte(s)
Tag kernel26-2.6.12-alx-r9
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 <linux/init.h> |
19 | #include <linux/module.h> |
20 | #include <linux/string.h> |
21 | #include <linux/crypto.h> |
22 | #include <asm/byteorder.h> |
23 | |
24 | #define MD5_DIGEST_SIZE 16 |
25 | #define MD5_HMAC_BLOCK_SIZE 64 |
26 | #define MD5_BLOCK_WORDS 16 |
27 | #define MD5_HASH_WORDS 4 |
28 | |
29 | #define F1(x, y, z) (z ^ (x & (y ^ z))) |
30 | #define F2(x, y, z) F1(z, x, y) |
31 | #define F3(x, y, z) (x ^ y ^ z) |
32 | #define F4(x, y, z) (y ^ (x | ~z)) |
33 | |
34 | #define MD5STEP(f, w, x, y, z, in, s) \ |
35 | (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x) |
36 | |
37 | struct md5_ctx { |
38 | u32 hash[MD5_HASH_WORDS]; |
39 | u32 block[MD5_BLOCK_WORDS]; |
40 | u64 byte_count; |
41 | }; |
42 | |
43 | static void md5_transform(u32 *hash, u32 const *in) |
44 | { |
45 | u32 a, b, c, d; |
46 | |
47 | a = hash[0]; |
48 | b = hash[1]; |
49 | c = hash[2]; |
50 | d = hash[3]; |
51 | |
52 | MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7); |
53 | MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12); |
54 | MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17); |
55 | MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22); |
56 | MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7); |
57 | MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12); |
58 | MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17); |
59 | MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22); |
60 | MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7); |
61 | MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12); |
62 | MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17); |
63 | MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22); |
64 | MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7); |
65 | MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12); |
66 | MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17); |
67 | MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22); |
68 | |
69 | MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5); |
70 | MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9); |
71 | MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14); |
72 | MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20); |
73 | MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5); |
74 | MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9); |
75 | MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14); |
76 | MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20); |
77 | MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5); |
78 | MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9); |
79 | MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14); |
80 | MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20); |
81 | MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5); |
82 | MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9); |
83 | MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14); |
84 | MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20); |
85 | |
86 | MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4); |
87 | MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11); |
88 | MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16); |
89 | MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23); |
90 | MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4); |
91 | MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11); |
92 | MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16); |
93 | MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23); |
94 | MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4); |
95 | MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11); |
96 | MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16); |
97 | MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23); |
98 | MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4); |
99 | MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11); |
100 | MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16); |
101 | MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23); |
102 | |
103 | MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6); |
104 | MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10); |
105 | MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15); |
106 | MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21); |
107 | MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6); |
108 | MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10); |
109 | MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15); |
110 | MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21); |
111 | MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6); |
112 | MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10); |
113 | MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15); |
114 | MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21); |
115 | MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6); |
116 | MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10); |
117 | MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15); |
118 | MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21); |
119 | |
120 | hash[0] += a; |
121 | hash[1] += b; |
122 | hash[2] += c; |
123 | hash[3] += d; |
124 | } |
125 | |
126 | /* XXX: this stuff can be optimized */ |
127 | static inline void le32_to_cpu_array(u32 *buf, unsigned int words) |
128 | { |
129 | while (words--) { |
130 | __le32_to_cpus(buf); |
131 | buf++; |
132 | } |
133 | } |
134 | |
135 | static inline void cpu_to_le32_array(u32 *buf, unsigned int words) |
136 | { |
137 | while (words--) { |
138 | __cpu_to_le32s(buf); |
139 | buf++; |
140 | } |
141 | } |
142 | |
143 | static inline void md5_transform_helper(struct md5_ctx *ctx) |
144 | { |
145 | le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); |
146 | md5_transform(ctx->hash, ctx->block); |
147 | } |
148 | |
149 | static void md5_init(void *ctx) |
150 | { |
151 | struct md5_ctx *mctx = ctx; |
152 | |
153 | mctx->hash[0] = 0x67452301; |
154 | mctx->hash[1] = 0xefcdab89; |
155 | mctx->hash[2] = 0x98badcfe; |
156 | mctx->hash[3] = 0x10325476; |
157 | mctx->byte_count = 0; |
158 | } |
159 | |
160 | static void md5_update(void *ctx, const u8 *data, unsigned int len) |
161 | { |
162 | struct md5_ctx *mctx = ctx; |
163 | const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); |
164 | |
165 | mctx->byte_count += len; |
166 | |
167 | if (avail > len) { |
168 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
169 | data, len); |
170 | return; |
171 | } |
172 | |
173 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
174 | data, avail); |
175 | |
176 | md5_transform_helper(mctx); |
177 | data += avail; |
178 | len -= avail; |
179 | |
180 | while (len >= sizeof(mctx->block)) { |
181 | memcpy(mctx->block, data, sizeof(mctx->block)); |
182 | md5_transform_helper(mctx); |
183 | data += sizeof(mctx->block); |
184 | len -= sizeof(mctx->block); |
185 | } |
186 | |
187 | memcpy(mctx->block, data, len); |
188 | } |
189 | |
190 | static void md5_final(void *ctx, u8 *out) |
191 | { |
192 | struct md5_ctx *mctx = ctx; |
193 | const unsigned int offset = mctx->byte_count & 0x3f; |
194 | char *p = (char *)mctx->block + offset; |
195 | int padding = 56 - (offset + 1); |
196 | |
197 | *p++ = 0x80; |
198 | if (padding < 0) { |
199 | memset(p, 0x00, padding + sizeof (u64)); |
200 | md5_transform_helper(mctx); |
201 | p = (char *)mctx->block; |
202 | padding = 56; |
203 | } |
204 | |
205 | memset(p, 0, padding); |
206 | mctx->block[14] = mctx->byte_count << 3; |
207 | mctx->block[15] = mctx->byte_count >> 29; |
208 | le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - |
209 | sizeof(u64)) / sizeof(u32)); |
210 | md5_transform(mctx->hash, mctx->block); |
211 | cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32)); |
212 | memcpy(out, mctx->hash, sizeof(mctx->hash)); |
213 | memset(mctx, 0, sizeof(*mctx)); |
214 | } |
215 | |
216 | static struct crypto_alg alg = { |
217 | .cra_name = "md5", |
218 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
219 | .cra_blocksize = MD5_HMAC_BLOCK_SIZE, |
220 | .cra_ctxsize = sizeof(struct md5_ctx), |
221 | .cra_module = THIS_MODULE, |
222 | .cra_list = LIST_HEAD_INIT(alg.cra_list), |
223 | .cra_u = { .digest = { |
224 | .dia_digestsize = MD5_DIGEST_SIZE, |
225 | .dia_init = md5_init, |
226 | .dia_update = md5_update, |
227 | .dia_final = md5_final } } |
228 | }; |
229 | |
230 | static int __init init(void) |
231 | { |
232 | return crypto_register_alg(&alg); |
233 | } |
234 | |
235 | static void __exit fini(void) |
236 | { |
237 | crypto_unregister_alg(&alg); |
238 | } |
239 | |
240 | module_init(init); |
241 | module_exit(fini); |
242 | |
243 | MODULE_LICENSE("GPL"); |
244 | MODULE_DESCRIPTION("MD5 Message Digest Algorithm"); |