Root/
1 | /* |
2 | * Cryptographic API. |
3 | * |
4 | * MD4 Message Digest Algorithm (RFC1320). |
5 | * |
6 | * Implementation derived from Andrew Tridgell and Steve French's |
7 | * CIFS MD4 implementation, and the cryptoapi implementation |
8 | * originally based on the public domain implementation written |
9 | * by Colin Plumb in 1993. |
10 | * |
11 | * Copyright (c) Andrew Tridgell 1997-1998. |
12 | * Modified by Steve French (sfrench@us.ibm.com) 2002 |
13 | * Copyright (c) Cryptoapi developers. |
14 | * Copyright (c) 2002 David S. Miller (davem@redhat.com) |
15 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
16 | * |
17 | * This program is free software; you can redistribute it and/or modify |
18 | * it under the terms of the GNU General Public License as published by |
19 | * the Free Software Foundation; either version 2 of the License, or |
20 | * (at your option) any later version. |
21 | * |
22 | */ |
23 | #include <crypto/internal/hash.h> |
24 | #include <linux/init.h> |
25 | #include <linux/kernel.h> |
26 | #include <linux/string.h> |
27 | #include <linux/types.h> |
28 | #include <asm/byteorder.h> |
29 | |
30 | #define MD4_DIGEST_SIZE 16 |
31 | #define MD4_HMAC_BLOCK_SIZE 64 |
32 | #define MD4_BLOCK_WORDS 16 |
33 | #define MD4_HASH_WORDS 4 |
34 | |
35 | struct md4_ctx { |
36 | u32 hash[MD4_HASH_WORDS]; |
37 | u32 block[MD4_BLOCK_WORDS]; |
38 | u64 byte_count; |
39 | }; |
40 | |
41 | static inline u32 lshift(u32 x, unsigned int s) |
42 | { |
43 | x &= 0xFFFFFFFF; |
44 | return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); |
45 | } |
46 | |
47 | static inline u32 F(u32 x, u32 y, u32 z) |
48 | { |
49 | return (x & y) | ((~x) & z); |
50 | } |
51 | |
52 | static inline u32 G(u32 x, u32 y, u32 z) |
53 | { |
54 | return (x & y) | (x & z) | (y & z); |
55 | } |
56 | |
57 | static inline u32 H(u32 x, u32 y, u32 z) |
58 | { |
59 | return x ^ y ^ z; |
60 | } |
61 | |
62 | #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s)) |
63 | #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s)) |
64 | #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s)) |
65 | |
66 | /* XXX: this stuff can be optimized */ |
67 | static inline void le32_to_cpu_array(u32 *buf, unsigned int words) |
68 | { |
69 | while (words--) { |
70 | __le32_to_cpus(buf); |
71 | buf++; |
72 | } |
73 | } |
74 | |
75 | static inline void cpu_to_le32_array(u32 *buf, unsigned int words) |
76 | { |
77 | while (words--) { |
78 | __cpu_to_le32s(buf); |
79 | buf++; |
80 | } |
81 | } |
82 | |
83 | static void md4_transform(u32 *hash, u32 const *in) |
84 | { |
85 | u32 a, b, c, d; |
86 | |
87 | a = hash[0]; |
88 | b = hash[1]; |
89 | c = hash[2]; |
90 | d = hash[3]; |
91 | |
92 | ROUND1(a, b, c, d, in[0], 3); |
93 | ROUND1(d, a, b, c, in[1], 7); |
94 | ROUND1(c, d, a, b, in[2], 11); |
95 | ROUND1(b, c, d, a, in[3], 19); |
96 | ROUND1(a, b, c, d, in[4], 3); |
97 | ROUND1(d, a, b, c, in[5], 7); |
98 | ROUND1(c, d, a, b, in[6], 11); |
99 | ROUND1(b, c, d, a, in[7], 19); |
100 | ROUND1(a, b, c, d, in[8], 3); |
101 | ROUND1(d, a, b, c, in[9], 7); |
102 | ROUND1(c, d, a, b, in[10], 11); |
103 | ROUND1(b, c, d, a, in[11], 19); |
104 | ROUND1(a, b, c, d, in[12], 3); |
105 | ROUND1(d, a, b, c, in[13], 7); |
106 | ROUND1(c, d, a, b, in[14], 11); |
107 | ROUND1(b, c, d, a, in[15], 19); |
108 | |
109 | ROUND2(a, b, c, d,in[ 0], 3); |
110 | ROUND2(d, a, b, c, in[4], 5); |
111 | ROUND2(c, d, a, b, in[8], 9); |
112 | ROUND2(b, c, d, a, in[12], 13); |
113 | ROUND2(a, b, c, d, in[1], 3); |
114 | ROUND2(d, a, b, c, in[5], 5); |
115 | ROUND2(c, d, a, b, in[9], 9); |
116 | ROUND2(b, c, d, a, in[13], 13); |
117 | ROUND2(a, b, c, d, in[2], 3); |
118 | ROUND2(d, a, b, c, in[6], 5); |
119 | ROUND2(c, d, a, b, in[10], 9); |
120 | ROUND2(b, c, d, a, in[14], 13); |
121 | ROUND2(a, b, c, d, in[3], 3); |
122 | ROUND2(d, a, b, c, in[7], 5); |
123 | ROUND2(c, d, a, b, in[11], 9); |
124 | ROUND2(b, c, d, a, in[15], 13); |
125 | |
126 | ROUND3(a, b, c, d,in[ 0], 3); |
127 | ROUND3(d, a, b, c, in[8], 9); |
128 | ROUND3(c, d, a, b, in[4], 11); |
129 | ROUND3(b, c, d, a, in[12], 15); |
130 | ROUND3(a, b, c, d, in[2], 3); |
131 | ROUND3(d, a, b, c, in[10], 9); |
132 | ROUND3(c, d, a, b, in[6], 11); |
133 | ROUND3(b, c, d, a, in[14], 15); |
134 | ROUND3(a, b, c, d, in[1], 3); |
135 | ROUND3(d, a, b, c, in[9], 9); |
136 | ROUND3(c, d, a, b, in[5], 11); |
137 | ROUND3(b, c, d, a, in[13], 15); |
138 | ROUND3(a, b, c, d, in[3], 3); |
139 | ROUND3(d, a, b, c, in[11], 9); |
140 | ROUND3(c, d, a, b, in[7], 11); |
141 | ROUND3(b, c, d, a, in[15], 15); |
142 | |
143 | hash[0] += a; |
144 | hash[1] += b; |
145 | hash[2] += c; |
146 | hash[3] += d; |
147 | } |
148 | |
149 | static inline void md4_transform_helper(struct md4_ctx *ctx) |
150 | { |
151 | le32_to_cpu_array(ctx->block, ARRAY_SIZE(ctx->block)); |
152 | md4_transform(ctx->hash, ctx->block); |
153 | } |
154 | |
155 | static int md4_init(struct shash_desc *desc) |
156 | { |
157 | struct md4_ctx *mctx = shash_desc_ctx(desc); |
158 | |
159 | mctx->hash[0] = 0x67452301; |
160 | mctx->hash[1] = 0xefcdab89; |
161 | mctx->hash[2] = 0x98badcfe; |
162 | mctx->hash[3] = 0x10325476; |
163 | mctx->byte_count = 0; |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | static int md4_update(struct shash_desc *desc, const u8 *data, unsigned int len) |
169 | { |
170 | struct md4_ctx *mctx = shash_desc_ctx(desc); |
171 | const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); |
172 | |
173 | mctx->byte_count += len; |
174 | |
175 | if (avail > len) { |
176 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
177 | data, len); |
178 | return 0; |
179 | } |
180 | |
181 | memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), |
182 | data, avail); |
183 | |
184 | md4_transform_helper(mctx); |
185 | data += avail; |
186 | len -= avail; |
187 | |
188 | while (len >= sizeof(mctx->block)) { |
189 | memcpy(mctx->block, data, sizeof(mctx->block)); |
190 | md4_transform_helper(mctx); |
191 | data += sizeof(mctx->block); |
192 | len -= sizeof(mctx->block); |
193 | } |
194 | |
195 | memcpy(mctx->block, data, len); |
196 | |
197 | return 0; |
198 | } |
199 | |
200 | static int md4_final(struct shash_desc *desc, u8 *out) |
201 | { |
202 | struct md4_ctx *mctx = shash_desc_ctx(desc); |
203 | const unsigned int offset = mctx->byte_count & 0x3f; |
204 | char *p = (char *)mctx->block + offset; |
205 | int padding = 56 - (offset + 1); |
206 | |
207 | *p++ = 0x80; |
208 | if (padding < 0) { |
209 | memset(p, 0x00, padding + sizeof (u64)); |
210 | md4_transform_helper(mctx); |
211 | p = (char *)mctx->block; |
212 | padding = 56; |
213 | } |
214 | |
215 | memset(p, 0, padding); |
216 | mctx->block[14] = mctx->byte_count << 3; |
217 | mctx->block[15] = mctx->byte_count >> 29; |
218 | le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - |
219 | sizeof(u64)) / sizeof(u32)); |
220 | md4_transform(mctx->hash, mctx->block); |
221 | cpu_to_le32_array(mctx->hash, ARRAY_SIZE(mctx->hash)); |
222 | memcpy(out, mctx->hash, sizeof(mctx->hash)); |
223 | memset(mctx, 0, sizeof(*mctx)); |
224 | |
225 | return 0; |
226 | } |
227 | |
228 | static struct shash_alg alg = { |
229 | .digestsize = MD4_DIGEST_SIZE, |
230 | .init = md4_init, |
231 | .update = md4_update, |
232 | .final = md4_final, |
233 | .descsize = sizeof(struct md4_ctx), |
234 | .base = { |
235 | .cra_name = "md4", |
236 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, |
237 | .cra_blocksize = MD4_HMAC_BLOCK_SIZE, |
238 | .cra_module = THIS_MODULE, |
239 | } |
240 | }; |
241 | |
242 | static int __init md4_mod_init(void) |
243 | { |
244 | return crypto_register_shash(&alg); |
245 | } |
246 | |
247 | static void __exit md4_mod_fini(void) |
248 | { |
249 | crypto_unregister_shash(&alg); |
250 | } |
251 | |
252 | module_init(md4_mod_init); |
253 | module_exit(md4_mod_fini); |
254 | |
255 | MODULE_LICENSE("GPL"); |
256 | MODULE_DESCRIPTION("MD4 Message Digest Algorithm"); |
257 | |
258 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9