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1da177e4 LT |
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"); |