Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#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);