1 #include <linux/kernel.h>
2 #include <linux/export.h>
3 #include <linux/cryptohash.h>
5 /* F, G and H are basic MD4 functions: selection, majority, parity */
6 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
7 #define G(x, y, z) (((x) & (y)) + (((x) ^ (y)) & (z)))
8 #define H(x, y, z) ((x) ^ (y) ^ (z))
11 * The generic round function. The application is so specific that
12 * we don't bother protecting all the arguments with parens, as is generally
13 * good macro practice, in favor of extra legibility.
14 * Rotation is separate from addition to prevent recomputation
16 #define ROUND(f, a, b, c, d, x, s) \
17 (a += f(b, c, d) + x, a = (a << s) | (a >> (32 - s)))
19 #define K2 013240474631UL
20 #define K3 015666365641UL
23 * Basic cut-down MD4 transform. Returns only 32 bits of result.
25 __u32
half_md4_transform(__u32 buf
[4], __u32
const in
[8])
27 __u32 a
= buf
[0], b
= buf
[1], c
= buf
[2], d
= buf
[3];
30 ROUND(F
, a
, b
, c
, d
, in
[0] + K1
, 3);
31 ROUND(F
, d
, a
, b
, c
, in
[1] + K1
, 7);
32 ROUND(F
, c
, d
, a
, b
, in
[2] + K1
, 11);
33 ROUND(F
, b
, c
, d
, a
, in
[3] + K1
, 19);
34 ROUND(F
, a
, b
, c
, d
, in
[4] + K1
, 3);
35 ROUND(F
, d
, a
, b
, c
, in
[5] + K1
, 7);
36 ROUND(F
, c
, d
, a
, b
, in
[6] + K1
, 11);
37 ROUND(F
, b
, c
, d
, a
, in
[7] + K1
, 19);
40 ROUND(G
, a
, b
, c
, d
, in
[1] + K2
, 3);
41 ROUND(G
, d
, a
, b
, c
, in
[3] + K2
, 5);
42 ROUND(G
, c
, d
, a
, b
, in
[5] + K2
, 9);
43 ROUND(G
, b
, c
, d
, a
, in
[7] + K2
, 13);
44 ROUND(G
, a
, b
, c
, d
, in
[0] + K2
, 3);
45 ROUND(G
, d
, a
, b
, c
, in
[2] + K2
, 5);
46 ROUND(G
, c
, d
, a
, b
, in
[4] + K2
, 9);
47 ROUND(G
, b
, c
, d
, a
, in
[6] + K2
, 13);
50 ROUND(H
, a
, b
, c
, d
, in
[3] + K3
, 3);
51 ROUND(H
, d
, a
, b
, c
, in
[7] + K3
, 9);
52 ROUND(H
, c
, d
, a
, b
, in
[2] + K3
, 11);
53 ROUND(H
, b
, c
, d
, a
, in
[6] + K3
, 15);
54 ROUND(H
, a
, b
, c
, d
, in
[1] + K3
, 3);
55 ROUND(H
, d
, a
, b
, c
, in
[5] + K3
, 9);
56 ROUND(H
, c
, d
, a
, b
, in
[0] + K3
, 11);
57 ROUND(H
, b
, c
, d
, a
, in
[4] + K3
, 15);
64 return buf
[1]; /* "most hashed" word */
66 EXPORT_SYMBOL(half_md4_transform
);
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