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-rw-r--r--crypto/md5.c244
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diff --git a/crypto/md5.c b/crypto/md5.c
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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 <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
37struct md5_ctx {
38 u32 hash[MD5_HASH_WORDS];
39 u32 block[MD5_BLOCK_WORDS];
40 u64 byte_count;
41};
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
126/* XXX: this stuff can be optimized */
127static 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
135static 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
143static 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
149static 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
160static 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
190static 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
216static 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
230static int __init init(void)
231{
232 return crypto_register_alg(&alg);
233}
234
235static void __exit fini(void)
236{
237 crypto_unregister_alg(&alg);
238}
239
240module_init(init);
241module_exit(fini);
242
243MODULE_LICENSE("GPL");
244MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-24 02:51:34 -0500