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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 <asm/byteorder.h>
25
26#define MD5_DIGEST_WORDS 4
27#define MD5_MESSAGE_BYTES 64
28
29const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = {
30 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04,
31 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e,
32};
33EXPORT_SYMBOL_GPL(md5_zero_message_hash);
34
35#define F1(x, y, z) (z ^ (x & (y ^ z)))
36#define F2(x, y, z) F1(z, x, y)
37#define F3(x, y, z) (x ^ y ^ z)
38#define F4(x, y, z) (y ^ (x | ~z))
39
40#define MD5STEP(f, w, x, y, z, in, s) \
41 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
42
43static 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
126static inline void md5_transform_helper(struct md5_state *ctx)
127{
128 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
129 md5_transform(ctx->hash, ctx->block);
130}
131
132static int md5_init(struct shash_desc *desc)
133{
134 struct md5_state *mctx = shash_desc_ctx(desc);
135
136 mctx->hash[0] = MD5_H0;
137 mctx->hash[1] = MD5_H1;
138 mctx->hash[2] = MD5_H2;
139 mctx->hash[3] = MD5_H3;
140 mctx->byte_count = 0;
141
142 return 0;
143}
144
145static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
146{
147 struct md5_state *mctx = shash_desc_ctx(desc);
148 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
149
150 mctx->byte_count += len;
151
152 if (avail > len) {
153 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
154 data, len);
155 return 0;
156 }
157
158 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
159 data, avail);
160
161 md5_transform_helper(mctx);
162 data += avail;
163 len -= avail;
164
165 while (len >= sizeof(mctx->block)) {
166 memcpy(mctx->block, data, sizeof(mctx->block));
167 md5_transform_helper(mctx);
168 data += sizeof(mctx->block);
169 len -= sizeof(mctx->block);
170 }
171
172 memcpy(mctx->block, data, len);
173
174 return 0;
175}
176
177static int md5_final(struct shash_desc *desc, u8 *out)
178{
179 struct md5_state *mctx = shash_desc_ctx(desc);
180 const unsigned int offset = mctx->byte_count & 0x3f;
181 char *p = (char *)mctx->block + offset;
182 int padding = 56 - (offset + 1);
183
184 *p++ = 0x80;
185 if (padding < 0) {
186 memset(p, 0x00, padding + sizeof (u64));
187 md5_transform_helper(mctx);
188 p = (char *)mctx->block;
189 padding = 56;
190 }
191
192 memset(p, 0, padding);
193 mctx->block[14] = mctx->byte_count << 3;
194 mctx->block[15] = mctx->byte_count >> 29;
195 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
196 sizeof(u64)) / sizeof(u32));
197 md5_transform(mctx->hash, mctx->block);
198 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(u32));
199 memcpy(out, mctx->hash, sizeof(mctx->hash));
200 memset(mctx, 0, sizeof(*mctx));
201
202 return 0;
203}
204
205static int md5_export(struct shash_desc *desc, void *out)
206{
207 struct md5_state *ctx = shash_desc_ctx(desc);
208
209 memcpy(out, ctx, sizeof(*ctx));
210 return 0;
211}
212
213static int md5_import(struct shash_desc *desc, const void *in)
214{
215 struct md5_state *ctx = shash_desc_ctx(desc);
216
217 memcpy(ctx, in, sizeof(*ctx));
218 return 0;
219}
220
221static struct shash_alg alg = {
222 .digestsize = MD5_DIGEST_SIZE,
223 .init = md5_init,
224 .update = md5_update,
225 .final = md5_final,
226 .export = md5_export,
227 .import = md5_import,
228 .descsize = sizeof(struct md5_state),
229 .statesize = sizeof(struct md5_state),
230 .base = {
231 .cra_name = "md5",
232 .cra_driver_name = "md5-generic",
233 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
234 .cra_module = THIS_MODULE,
235 }
236};
237
238static int __init md5_mod_init(void)
239{
240 return crypto_register_shash(&alg);
241}
242
243static void __exit md5_mod_fini(void)
244{
245 crypto_unregister_shash(&alg);
246}
247
248subsys_initcall(md5_mod_init);
249module_exit(md5_mod_fini);
250
251MODULE_LICENSE("GPL");
252MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
253MODULE_ALIAS_CRYPTO("md5");
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 */
28static 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
36static 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
44static 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
50static 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
63static 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
95static 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
123static 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
131static 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
139static 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
156static int __init md5_mod_init(void)
157{
158 return crypto_register_shash(&alg);
159}
160
161static void __exit md5_mod_fini(void)
162{
163 crypto_unregister_shash(&alg);
164}
165
166module_init(md5_mod_init);
167module_exit(md5_mod_fini);
168
169MODULE_LICENSE("GPL");
170MODULE_DESCRIPTION("MD5 Message Digest Algorithm");