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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +080018#include <crypto/internal/hash.h>
Max Vozeler7d6f75e2010-01-17 21:55:31 +110019#include <crypto/md5.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/init.h>
21#include <linux/module.h>
22#include <linux/string.h>
Herbert Xu06ace7a2005-10-30 21:25:15 +110023#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <asm/byteorder.h>
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define F1(x, y, z) (z ^ (x & (y ^ z)))
27#define F2(x, y, z) F1(z, x, y)
28#define F3(x, y, z) (x ^ y ^ z)
29#define F4(x, y, z) (y ^ (x | ~z))
30
31#define MD5STEP(f, w, x, y, z, in, s) \
32 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static void md5_transform(u32 *hash, u32 const *in)
35{
36 u32 a, b, c, d;
37
38 a = hash[0];
39 b = hash[1];
40 c = hash[2];
41 d = hash[3];
42
43 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
44 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
45 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
46 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
47 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
48 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
49 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
50 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
51 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
52 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
53 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
54 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
55 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
56 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
57 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
58 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
59
60 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
61 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
62 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
63 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
64 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
65 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
66 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
67 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
68 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
69 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
70 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
71 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
72 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
73 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
74 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
75 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
76
77 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
78 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
79 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
80 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
81 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
82 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
83 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
84 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
85 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
86 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
87 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
88 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
89 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
90 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
91 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
92 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
93
94 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
95 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
96 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
97 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
98 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
99 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
100 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
101 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
102 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
103 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
104 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
105 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
106 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
107 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
108 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
109 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
110
111 hash[0] += a;
112 hash[1] += b;
113 hash[2] += c;
114 hash[3] += d;
115}
116
117/* XXX: this stuff can be optimized */
118static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
119{
120 while (words--) {
121 __le32_to_cpus(buf);
122 buf++;
123 }
124}
125
126static inline void cpu_to_le32_array(u32 *buf, unsigned int words)
127{
128 while (words--) {
129 __cpu_to_le32s(buf);
130 buf++;
131 }
132}
133
Max Vozeler7d6f75e2010-01-17 21:55:31 +1100134static inline void md5_transform_helper(struct md5_state *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
137 md5_transform(ctx->hash, ctx->block);
138}
139
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800140static int md5_init(struct shash_desc *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
Max Vozeler7d6f75e2010-01-17 21:55:31 +1100142 struct md5_state *mctx = shash_desc_ctx(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 mctx->hash[0] = 0x67452301;
145 mctx->hash[1] = 0xefcdab89;
146 mctx->hash[2] = 0x98badcfe;
147 mctx->hash[3] = 0x10325476;
148 mctx->byte_count = 0;
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800149
150 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800153static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Max Vozeler7d6f75e2010-01-17 21:55:31 +1100155 struct md5_state *mctx = shash_desc_ctx(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
157
158 mctx->byte_count += len;
159
160 if (avail > len) {
161 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
162 data, len);
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800163 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165
166 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
167 data, avail);
168
169 md5_transform_helper(mctx);
170 data += avail;
171 len -= avail;
172
173 while (len >= sizeof(mctx->block)) {
174 memcpy(mctx->block, data, sizeof(mctx->block));
175 md5_transform_helper(mctx);
176 data += sizeof(mctx->block);
177 len -= sizeof(mctx->block);
178 }
179
180 memcpy(mctx->block, data, len);
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800181
182 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183}
184
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800185static int md5_final(struct shash_desc *desc, u8 *out)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186{
Max Vozeler7d6f75e2010-01-17 21:55:31 +1100187 struct md5_state *mctx = shash_desc_ctx(desc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 const unsigned int offset = mctx->byte_count & 0x3f;
189 char *p = (char *)mctx->block + offset;
190 int padding = 56 - (offset + 1);
191
192 *p++ = 0x80;
193 if (padding < 0) {
194 memset(p, 0x00, padding + sizeof (u64));
195 md5_transform_helper(mctx);
196 p = (char *)mctx->block;
197 padding = 56;
198 }
199
200 memset(p, 0, padding);
201 mctx->block[14] = mctx->byte_count << 3;
202 mctx->block[15] = mctx->byte_count >> 29;
203 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
204 sizeof(u64)) / sizeof(u32));
205 md5_transform(mctx->hash, mctx->block);
206 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
207 memcpy(out, mctx->hash, sizeof(mctx->hash));
208 memset(mctx, 0, sizeof(*mctx));
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800209
210 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211}
212
Max Vozeler7d6f75e2010-01-17 21:55:31 +1100213static int md5_export(struct shash_desc *desc, void *out)
214{
215 struct md5_state *ctx = shash_desc_ctx(desc);
216
217 memcpy(out, ctx, sizeof(*ctx));
218 return 0;
219}
220
221static int md5_import(struct shash_desc *desc, const void *in)
222{
223 struct md5_state *ctx = shash_desc_ctx(desc);
224
225 memcpy(ctx, in, sizeof(*ctx));
226 return 0;
227}
228
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800229static struct shash_alg alg = {
230 .digestsize = MD5_DIGEST_SIZE,
231 .init = md5_init,
232 .update = md5_update,
233 .final = md5_final,
Max Vozeler7d6f75e2010-01-17 21:55:31 +1100234 .export = md5_export,
235 .import = md5_import,
236 .descsize = sizeof(struct md5_state),
Herbert Xueebb1112010-03-02 21:58:16 +0800237 .statesize = sizeof(struct md5_state),
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800238 .base = {
239 .cra_name = "md5",
240 .cra_flags = CRYPTO_ALG_TYPE_SHASH,
241 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
242 .cra_module = THIS_MODULE,
243 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244};
245
Kamalesh Babulal3af5b902008-04-05 21:00:57 +0800246static int __init md5_mod_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247{
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800248 return crypto_register_shash(&alg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
Kamalesh Babulal3af5b902008-04-05 21:00:57 +0800251static void __exit md5_mod_fini(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
Adrian-Ken Rueegsegger14b75ba2008-12-03 19:57:12 +0800253 crypto_unregister_shash(&alg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
255
Kamalesh Babulal3af5b902008-04-05 21:00:57 +0800256module_init(md5_mod_init);
257module_exit(md5_mod_fini);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258
259MODULE_LICENSE("GPL");
260MODULE_DESCRIPTION("MD5 Message Digest Algorithm");