67 lines
2 KiB
C
67 lines
2 KiB
C
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/cryptohash.h>
|
||
|
|
|
||
|
|
/* F, G and H are basic MD4 functions: selection, majority, parity */
|
||
|
|
#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
|
||
|
|
#define G(x, y, z) (((x) & (y)) + (((x) ^ (y)) & (z)))
|
||
|
|
#define H(x, y, z) ((x) ^ (y) ^ (z))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The generic round function. The application is so specific that
|
||
|
|
* we don't bother protecting all the arguments with parens, as is generally
|
||
|
|
* good macro practice, in favor of extra legibility.
|
||
|
|
* Rotation is separate from addition to prevent recomputation
|
||
|
|
*/
|
||
|
|
#define ROUND(f, a, b, c, d, x, s) \
|
||
|
|
(a += f(b, c, d) + x, a = (a << s) | (a >> (32 - s)))
|
||
|
|
#define K1 0
|
||
|
|
#define K2 013240474631UL
|
||
|
|
#define K3 015666365641UL
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Basic cut-down MD4 transform. Returns only 32 bits of result.
|
||
|
|
*/
|
||
|
|
__u32 half_md4_transform(__u32 buf[4], __u32 const in[8])
|
||
|
|
{
|
||
|
|
__u32 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
|
||
|
|
|
||
|
|
/* Round 1 */
|
||
|
|
ROUND(F, a, b, c, d, in[0] + K1, 3);
|
||
|
|
ROUND(F, d, a, b, c, in[1] + K1, 7);
|
||
|
|
ROUND(F, c, d, a, b, in[2] + K1, 11);
|
||
|
|
ROUND(F, b, c, d, a, in[3] + K1, 19);
|
||
|
|
ROUND(F, a, b, c, d, in[4] + K1, 3);
|
||
|
|
ROUND(F, d, a, b, c, in[5] + K1, 7);
|
||
|
|
ROUND(F, c, d, a, b, in[6] + K1, 11);
|
||
|
|
ROUND(F, b, c, d, a, in[7] + K1, 19);
|
||
|
|
|
||
|
|
/* Round 2 */
|
||
|
|
ROUND(G, a, b, c, d, in[1] + K2, 3);
|
||
|
|
ROUND(G, d, a, b, c, in[3] + K2, 5);
|
||
|
|
ROUND(G, c, d, a, b, in[5] + K2, 9);
|
||
|
|
ROUND(G, b, c, d, a, in[7] + K2, 13);
|
||
|
|
ROUND(G, a, b, c, d, in[0] + K2, 3);
|
||
|
|
ROUND(G, d, a, b, c, in[2] + K2, 5);
|
||
|
|
ROUND(G, c, d, a, b, in[4] + K2, 9);
|
||
|
|
ROUND(G, b, c, d, a, in[6] + K2, 13);
|
||
|
|
|
||
|
|
/* Round 3 */
|
||
|
|
ROUND(H, a, b, c, d, in[3] + K3, 3);
|
||
|
|
ROUND(H, d, a, b, c, in[7] + K3, 9);
|
||
|
|
ROUND(H, c, d, a, b, in[2] + K3, 11);
|
||
|
|
ROUND(H, b, c, d, a, in[6] + K3, 15);
|
||
|
|
ROUND(H, a, b, c, d, in[1] + K3, 3);
|
||
|
|
ROUND(H, d, a, b, c, in[5] + K3, 9);
|
||
|
|
ROUND(H, c, d, a, b, in[0] + K3, 11);
|
||
|
|
ROUND(H, b, c, d, a, in[4] + K3, 15);
|
||
|
|
|
||
|
|
buf[0] += a;
|
||
|
|
buf[1] += b;
|
||
|
|
buf[2] += c;
|
||
|
|
buf[3] += d;
|
||
|
|
|
||
|
|
return buf[1]; /* "most hashed" word */
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(half_md4_transform);
|