4 * MD4 Message Digest Algorithm (RFC1320).
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.
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>
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.
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>
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
36 u32 hash
[MD4_HASH_WORDS
];
37 u32 block
[MD4_BLOCK_WORDS
];
41 static inline u32
lshift(u32 x
, unsigned int s
)
44 return ((x
<< s
) & 0xFFFFFFFF) | (x
>> (32 - s
));
47 static inline u32
F(u32 x
, u32 y
, u32 z
)
49 return (x
& y
) | ((~x
) & z
);
52 static inline u32
G(u32 x
, u32 y
, u32 z
)
54 return (x
& y
) | (x
& z
) | (y
& z
);
57 static inline u32
H(u32 x
, u32 y
, u32 z
)
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))
66 /* XXX: this stuff can be optimized */
67 static inline void le32_to_cpu_array(u32
*buf
, unsigned int words
)
75 static inline void cpu_to_le32_array(u32
*buf
, unsigned int words
)
83 static void md4_transform(u32
*hash
, u32
const *in
)
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);
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);
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);
149 static inline void md4_transform_helper(struct md4_ctx
*ctx
)
151 le32_to_cpu_array(ctx
->block
, ARRAY_SIZE(ctx
->block
));
152 md4_transform(ctx
->hash
, ctx
->block
);
155 static int md4_init(struct shash_desc
*desc
)
157 struct md4_ctx
*mctx
= shash_desc_ctx(desc
);
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;
168 static int md4_update(struct shash_desc
*desc
, const u8
*data
, unsigned int len
)
170 struct md4_ctx
*mctx
= shash_desc_ctx(desc
);
171 const u32 avail
= sizeof(mctx
->block
) - (mctx
->byte_count
& 0x3f);
173 mctx
->byte_count
+= len
;
176 memcpy((char *)mctx
->block
+ (sizeof(mctx
->block
) - avail
),
181 memcpy((char *)mctx
->block
+ (sizeof(mctx
->block
) - avail
),
184 md4_transform_helper(mctx
);
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
);
195 memcpy(mctx
->block
, data
, len
);
200 static int md4_final(struct shash_desc
*desc
, u8
*out
)
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);
209 memset(p
, 0x00, padding
+ sizeof (u64
));
210 md4_transform_helper(mctx
);
211 p
= (char *)mctx
->block
;
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
));
228 static struct shash_alg alg
= {
229 .digestsize
= MD4_DIGEST_SIZE
,
231 .update
= md4_update
,
233 .descsize
= sizeof(struct md4_ctx
),
236 .cra_flags
= CRYPTO_ALG_TYPE_SHASH
,
237 .cra_blocksize
= MD4_HMAC_BLOCK_SIZE
,
238 .cra_module
= THIS_MODULE
,
242 static int __init
md4_mod_init(void)
244 return crypto_register_shash(&alg
);
247 static void __exit
md4_mod_fini(void)
249 crypto_unregister_shash(&alg
);
252 module_init(md4_mod_init
);
253 module_exit(md4_mod_fini
);
255 MODULE_LICENSE("GPL");
256 MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
This page took 0.044867 seconds and 5 git commands to generate.