4 * MD5 Message Digest Algorithm (RFC1321).
6 * Derived from cryptoapi implementation, originally based on the
7 * public domain implementation written by Colin Plumb in 1993.
9 * Copyright (c) Cryptoapi developers.
10 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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)
18 #include <crypto/internal/hash.h>
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/types.h>
23 #include <asm/byteorder.h>
25 #define MD5_DIGEST_SIZE 16
26 #define MD5_HMAC_BLOCK_SIZE 64
27 #define MD5_BLOCK_WORDS 16
28 #define MD5_HASH_WORDS 4
30 #define F1(x, y, z) (z ^ (x & (y ^ z)))
31 #define F2(x, y, z) F1(z, x, y)
32 #define F3(x, y, z) (x ^ y ^ z)
33 #define F4(x, y, z) (y ^ (x | ~z))
35 #define MD5STEP(f, w, x, y, z, in, s) \
36 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
39 u32 hash
[MD5_HASH_WORDS
];
40 u32 block
[MD5_BLOCK_WORDS
];
44 static void md5_transform(u32
*hash
, u32
const *in
)
53 MD5STEP(F1
, a
, b
, c
, d
, in
[0] + 0xd76aa478, 7);
54 MD5STEP(F1
, d
, a
, b
, c
, in
[1] + 0xe8c7b756, 12);
55 MD5STEP(F1
, c
, d
, a
, b
, in
[2] + 0x242070db, 17);
56 MD5STEP(F1
, b
, c
, d
, a
, in
[3] + 0xc1bdceee, 22);
57 MD5STEP(F1
, a
, b
, c
, d
, in
[4] + 0xf57c0faf, 7);
58 MD5STEP(F1
, d
, a
, b
, c
, in
[5] + 0x4787c62a, 12);
59 MD5STEP(F1
, c
, d
, a
, b
, in
[6] + 0xa8304613, 17);
60 MD5STEP(F1
, b
, c
, d
, a
, in
[7] + 0xfd469501, 22);
61 MD5STEP(F1
, a
, b
, c
, d
, in
[8] + 0x698098d8, 7);
62 MD5STEP(F1
, d
, a
, b
, c
, in
[9] + 0x8b44f7af, 12);
63 MD5STEP(F1
, c
, d
, a
, b
, in
[10] + 0xffff5bb1, 17);
64 MD5STEP(F1
, b
, c
, d
, a
, in
[11] + 0x895cd7be, 22);
65 MD5STEP(F1
, a
, b
, c
, d
, in
[12] + 0x6b901122, 7);
66 MD5STEP(F1
, d
, a
, b
, c
, in
[13] + 0xfd987193, 12);
67 MD5STEP(F1
, c
, d
, a
, b
, in
[14] + 0xa679438e, 17);
68 MD5STEP(F1
, b
, c
, d
, a
, in
[15] + 0x49b40821, 22);
70 MD5STEP(F2
, a
, b
, c
, d
, in
[1] + 0xf61e2562, 5);
71 MD5STEP(F2
, d
, a
, b
, c
, in
[6] + 0xc040b340, 9);
72 MD5STEP(F2
, c
, d
, a
, b
, in
[11] + 0x265e5a51, 14);
73 MD5STEP(F2
, b
, c
, d
, a
, in
[0] + 0xe9b6c7aa, 20);
74 MD5STEP(F2
, a
, b
, c
, d
, in
[5] + 0xd62f105d, 5);
75 MD5STEP(F2
, d
, a
, b
, c
, in
[10] + 0x02441453, 9);
76 MD5STEP(F2
, c
, d
, a
, b
, in
[15] + 0xd8a1e681, 14);
77 MD5STEP(F2
, b
, c
, d
, a
, in
[4] + 0xe7d3fbc8, 20);
78 MD5STEP(F2
, a
, b
, c
, d
, in
[9] + 0x21e1cde6, 5);
79 MD5STEP(F2
, d
, a
, b
, c
, in
[14] + 0xc33707d6, 9);
80 MD5STEP(F2
, c
, d
, a
, b
, in
[3] + 0xf4d50d87, 14);
81 MD5STEP(F2
, b
, c
, d
, a
, in
[8] + 0x455a14ed, 20);
82 MD5STEP(F2
, a
, b
, c
, d
, in
[13] + 0xa9e3e905, 5);
83 MD5STEP(F2
, d
, a
, b
, c
, in
[2] + 0xfcefa3f8, 9);
84 MD5STEP(F2
, c
, d
, a
, b
, in
[7] + 0x676f02d9, 14);
85 MD5STEP(F2
, b
, c
, d
, a
, in
[12] + 0x8d2a4c8a, 20);
87 MD5STEP(F3
, a
, b
, c
, d
, in
[5] + 0xfffa3942, 4);
88 MD5STEP(F3
, d
, a
, b
, c
, in
[8] + 0x8771f681, 11);
89 MD5STEP(F3
, c
, d
, a
, b
, in
[11] + 0x6d9d6122, 16);
90 MD5STEP(F3
, b
, c
, d
, a
, in
[14] + 0xfde5380c, 23);
91 MD5STEP(F3
, a
, b
, c
, d
, in
[1] + 0xa4beea44, 4);
92 MD5STEP(F3
, d
, a
, b
, c
, in
[4] + 0x4bdecfa9, 11);
93 MD5STEP(F3
, c
, d
, a
, b
, in
[7] + 0xf6bb4b60, 16);
94 MD5STEP(F3
, b
, c
, d
, a
, in
[10] + 0xbebfbc70, 23);
95 MD5STEP(F3
, a
, b
, c
, d
, in
[13] + 0x289b7ec6, 4);
96 MD5STEP(F3
, d
, a
, b
, c
, in
[0] + 0xeaa127fa, 11);
97 MD5STEP(F3
, c
, d
, a
, b
, in
[3] + 0xd4ef3085, 16);
98 MD5STEP(F3
, b
, c
, d
, a
, in
[6] + 0x04881d05, 23);
99 MD5STEP(F3
, a
, b
, c
, d
, in
[9] + 0xd9d4d039, 4);
100 MD5STEP(F3
, d
, a
, b
, c
, in
[12] + 0xe6db99e5, 11);
101 MD5STEP(F3
, c
, d
, a
, b
, in
[15] + 0x1fa27cf8, 16);
102 MD5STEP(F3
, b
, c
, d
, a
, in
[2] + 0xc4ac5665, 23);
104 MD5STEP(F4
, a
, b
, c
, d
, in
[0] + 0xf4292244, 6);
105 MD5STEP(F4
, d
, a
, b
, c
, in
[7] + 0x432aff97, 10);
106 MD5STEP(F4
, c
, d
, a
, b
, in
[14] + 0xab9423a7, 15);
107 MD5STEP(F4
, b
, c
, d
, a
, in
[5] + 0xfc93a039, 21);
108 MD5STEP(F4
, a
, b
, c
, d
, in
[12] + 0x655b59c3, 6);
109 MD5STEP(F4
, d
, a
, b
, c
, in
[3] + 0x8f0ccc92, 10);
110 MD5STEP(F4
, c
, d
, a
, b
, in
[10] + 0xffeff47d, 15);
111 MD5STEP(F4
, b
, c
, d
, a
, in
[1] + 0x85845dd1, 21);
112 MD5STEP(F4
, a
, b
, c
, d
, in
[8] + 0x6fa87e4f, 6);
113 MD5STEP(F4
, d
, a
, b
, c
, in
[15] + 0xfe2ce6e0, 10);
114 MD5STEP(F4
, c
, d
, a
, b
, in
[6] + 0xa3014314, 15);
115 MD5STEP(F4
, b
, c
, d
, a
, in
[13] + 0x4e0811a1, 21);
116 MD5STEP(F4
, a
, b
, c
, d
, in
[4] + 0xf7537e82, 6);
117 MD5STEP(F4
, d
, a
, b
, c
, in
[11] + 0xbd3af235, 10);
118 MD5STEP(F4
, c
, d
, a
, b
, in
[2] + 0x2ad7d2bb, 15);
119 MD5STEP(F4
, b
, c
, d
, a
, in
[9] + 0xeb86d391, 21);
127 /* XXX: this stuff can be optimized */
128 static inline void le32_to_cpu_array(u32
*buf
, unsigned int words
)
136 static inline void cpu_to_le32_array(u32
*buf
, unsigned int words
)
144 static inline void md5_transform_helper(struct md5_ctx
*ctx
)
146 le32_to_cpu_array(ctx
->block
, sizeof(ctx
->block
) / sizeof(u32
));
147 md5_transform(ctx
->hash
, ctx
->block
);
150 static int md5_init(struct shash_desc
*desc
)
152 struct md5_ctx
*mctx
= shash_desc_ctx(desc
);
154 mctx
->hash
[0] = 0x67452301;
155 mctx
->hash
[1] = 0xefcdab89;
156 mctx
->hash
[2] = 0x98badcfe;
157 mctx
->hash
[3] = 0x10325476;
158 mctx
->byte_count
= 0;
163 static int md5_update(struct shash_desc
*desc
, const u8
*data
, unsigned int len
)
165 struct md5_ctx
*mctx
= shash_desc_ctx(desc
);
166 const u32 avail
= sizeof(mctx
->block
) - (mctx
->byte_count
& 0x3f);
168 mctx
->byte_count
+= len
;
171 memcpy((char *)mctx
->block
+ (sizeof(mctx
->block
) - avail
),
176 memcpy((char *)mctx
->block
+ (sizeof(mctx
->block
) - avail
),
179 md5_transform_helper(mctx
);
183 while (len
>= sizeof(mctx
->block
)) {
184 memcpy(mctx
->block
, data
, sizeof(mctx
->block
));
185 md5_transform_helper(mctx
);
186 data
+= sizeof(mctx
->block
);
187 len
-= sizeof(mctx
->block
);
190 memcpy(mctx
->block
, data
, len
);
195 static int md5_final(struct shash_desc
*desc
, u8
*out
)
197 struct md5_ctx
*mctx
= shash_desc_ctx(desc
);
198 const unsigned int offset
= mctx
->byte_count
& 0x3f;
199 char *p
= (char *)mctx
->block
+ offset
;
200 int padding
= 56 - (offset
+ 1);
204 memset(p
, 0x00, padding
+ sizeof (u64
));
205 md5_transform_helper(mctx
);
206 p
= (char *)mctx
->block
;
210 memset(p
, 0, padding
);
211 mctx
->block
[14] = mctx
->byte_count
<< 3;
212 mctx
->block
[15] = mctx
->byte_count
>> 29;
213 le32_to_cpu_array(mctx
->block
, (sizeof(mctx
->block
) -
214 sizeof(u64
)) / sizeof(u32
));
215 md5_transform(mctx
->hash
, mctx
->block
);
216 cpu_to_le32_array(mctx
->hash
, sizeof(mctx
->hash
) / sizeof(u32
));
217 memcpy(out
, mctx
->hash
, sizeof(mctx
->hash
));
218 memset(mctx
, 0, sizeof(*mctx
));
223 static struct shash_alg alg
= {
224 .digestsize
= MD5_DIGEST_SIZE
,
226 .update
= md5_update
,
228 .descsize
= sizeof(struct md5_ctx
),
231 .cra_flags
= CRYPTO_ALG_TYPE_SHASH
,
232 .cra_blocksize
= MD5_HMAC_BLOCK_SIZE
,
233 .cra_module
= THIS_MODULE
,
237 static int __init
md5_mod_init(void)
239 return crypto_register_shash(&alg
);
242 static void __exit
md5_mod_fini(void)
244 crypto_unregister_shash(&alg
);
247 module_init(md5_mod_init
);
248 module_exit(md5_mod_fini
);
250 MODULE_LICENSE("GPL");
251 MODULE_DESCRIPTION("MD5 Message Digest Algorithm");
This page took 0.036761 seconds and 5 git commands to generate.