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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - crypto/md4.c
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/module.h>
27 #include <linux/string.h>
28 #include <linux/types.h>
29 #include <asm/byteorder.h>
31 #define MD4_DIGEST_SIZE 16
32 #define MD4_HMAC_BLOCK_SIZE 64
33 #define MD4_BLOCK_WORDS 16
34 #define MD4_HASH_WORDS 4
37 u32 hash
[MD4_HASH_WORDS
];
38 u32 block
[MD4_BLOCK_WORDS
];
42 static inline u32
lshift(u32 x
, unsigned int s
)
45 return ((x
<< s
) & 0xFFFFFFFF) | (x
>> (32 - s
));
48 static inline u32
F(u32 x
, u32 y
, u32 z
)
50 return (x
& y
) | ((~x
) & z
);
53 static inline u32
G(u32 x
, u32 y
, u32 z
)
55 return (x
& y
) | (x
& z
) | (y
& z
);
58 static inline u32
H(u32 x
, u32 y
, u32 z
)
63 #define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
64 #define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
65 #define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
67 static void md4_transform(u32
*hash
, u32
const *in
)
76 ROUND1(a
, b
, c
, d
, in
[0], 3);
77 ROUND1(d
, a
, b
, c
, in
[1], 7);
78 ROUND1(c
, d
, a
, b
, in
[2], 11);
79 ROUND1(b
, c
, d
, a
, in
[3], 19);
80 ROUND1(a
, b
, c
, d
, in
[4], 3);
81 ROUND1(d
, a
, b
, c
, in
[5], 7);
82 ROUND1(c
, d
, a
, b
, in
[6], 11);
83 ROUND1(b
, c
, d
, a
, in
[7], 19);
84 ROUND1(a
, b
, c
, d
, in
[8], 3);
85 ROUND1(d
, a
, b
, c
, in
[9], 7);
86 ROUND1(c
, d
, a
, b
, in
[10], 11);
87 ROUND1(b
, c
, d
, a
, in
[11], 19);
88 ROUND1(a
, b
, c
, d
, in
[12], 3);
89 ROUND1(d
, a
, b
, c
, in
[13], 7);
90 ROUND1(c
, d
, a
, b
, in
[14], 11);
91 ROUND1(b
, c
, d
, a
, in
[15], 19);
93 ROUND2(a
, b
, c
, d
,in
[ 0], 3);
94 ROUND2(d
, a
, b
, c
, in
[4], 5);
95 ROUND2(c
, d
, a
, b
, in
[8], 9);
96 ROUND2(b
, c
, d
, a
, in
[12], 13);
97 ROUND2(a
, b
, c
, d
, in
[1], 3);
98 ROUND2(d
, a
, b
, c
, in
[5], 5);
99 ROUND2(c
, d
, a
, b
, in
[9], 9);
100 ROUND2(b
, c
, d
, a
, in
[13], 13);
101 ROUND2(a
, b
, c
, d
, in
[2], 3);
102 ROUND2(d
, a
, b
, c
, in
[6], 5);
103 ROUND2(c
, d
, a
, b
, in
[10], 9);
104 ROUND2(b
, c
, d
, a
, in
[14], 13);
105 ROUND2(a
, b
, c
, d
, in
[3], 3);
106 ROUND2(d
, a
, b
, c
, in
[7], 5);
107 ROUND2(c
, d
, a
, b
, in
[11], 9);
108 ROUND2(b
, c
, d
, a
, in
[15], 13);
110 ROUND3(a
, b
, c
, d
,in
[ 0], 3);
111 ROUND3(d
, a
, b
, c
, in
[8], 9);
112 ROUND3(c
, d
, a
, b
, in
[4], 11);
113 ROUND3(b
, c
, d
, a
, in
[12], 15);
114 ROUND3(a
, b
, c
, d
, in
[2], 3);
115 ROUND3(d
, a
, b
, c
, in
[10], 9);
116 ROUND3(c
, d
, a
, b
, in
[6], 11);
117 ROUND3(b
, c
, d
, a
, in
[14], 15);
118 ROUND3(a
, b
, c
, d
, in
[1], 3);
119 ROUND3(d
, a
, b
, c
, in
[9], 9);
120 ROUND3(c
, d
, a
, b
, in
[5], 11);
121 ROUND3(b
, c
, d
, a
, in
[13], 15);
122 ROUND3(a
, b
, c
, d
, in
[3], 3);
123 ROUND3(d
, a
, b
, c
, in
[11], 9);
124 ROUND3(c
, d
, a
, b
, in
[7], 11);
125 ROUND3(b
, c
, d
, a
, in
[15], 15);
133 static inline void md4_transform_helper(struct md4_ctx
*ctx
)
135 le32_to_cpu_array(ctx
->block
, ARRAY_SIZE(ctx
->block
));
136 md4_transform(ctx
->hash
, ctx
->block
);
139 static int md4_init(struct shash_desc
*desc
)
141 struct md4_ctx
*mctx
= shash_desc_ctx(desc
);
143 mctx
->hash
[0] = 0x67452301;
144 mctx
->hash
[1] = 0xefcdab89;
145 mctx
->hash
[2] = 0x98badcfe;
146 mctx
->hash
[3] = 0x10325476;
147 mctx
->byte_count
= 0;
152 static int md4_update(struct shash_desc
*desc
, const u8
*data
, unsigned int len
)
154 struct md4_ctx
*mctx
= shash_desc_ctx(desc
);
155 const u32 avail
= sizeof(mctx
->block
) - (mctx
->byte_count
& 0x3f);
157 mctx
->byte_count
+= len
;
160 memcpy((char *)mctx
->block
+ (sizeof(mctx
->block
) - avail
),
165 memcpy((char *)mctx
->block
+ (sizeof(mctx
->block
) - avail
),
168 md4_transform_helper(mctx
);
172 while (len
>= sizeof(mctx
->block
)) {
173 memcpy(mctx
->block
, data
, sizeof(mctx
->block
));
174 md4_transform_helper(mctx
);
175 data
+= sizeof(mctx
->block
);
176 len
-= sizeof(mctx
->block
);
179 memcpy(mctx
->block
, data
, len
);
184 static int md4_final(struct shash_desc
*desc
, u8
*out
)
186 struct md4_ctx
*mctx
= shash_desc_ctx(desc
);
187 const unsigned int offset
= mctx
->byte_count
& 0x3f;
188 char *p
= (char *)mctx
->block
+ offset
;
189 int padding
= 56 - (offset
+ 1);
193 memset(p
, 0x00, padding
+ sizeof (u64
));
194 md4_transform_helper(mctx
);
195 p
= (char *)mctx
->block
;
199 memset(p
, 0, padding
);
200 mctx
->block
[14] = mctx
->byte_count
<< 3;
201 mctx
->block
[15] = mctx
->byte_count
>> 29;
202 le32_to_cpu_array(mctx
->block
, (sizeof(mctx
->block
) -
203 sizeof(u64
)) / sizeof(u32
));
204 md4_transform(mctx
->hash
, mctx
->block
);
205 cpu_to_le32_array(mctx
->hash
, ARRAY_SIZE(mctx
->hash
));
206 memcpy(out
, mctx
->hash
, sizeof(mctx
->hash
));
207 memset(mctx
, 0, sizeof(*mctx
));
212 static struct shash_alg alg
= {
213 .digestsize
= MD4_DIGEST_SIZE
,
215 .update
= md4_update
,
217 .descsize
= sizeof(struct md4_ctx
),
220 .cra_blocksize
= MD4_HMAC_BLOCK_SIZE
,
221 .cra_module
= THIS_MODULE
,
225 static int __init
md4_mod_init(void)
227 return crypto_register_shash(&alg
);
230 static void __exit
md4_mod_fini(void)
232 crypto_unregister_shash(&alg
);
235 subsys_initcall(md4_mod_init
);
236 module_exit(md4_mod_fini
);
238 MODULE_LICENSE("GPL");
239 MODULE_DESCRIPTION("MD4 Message Digest Algorithm");
240 MODULE_ALIAS_CRYPTO("md4");