# Release 4.8 lib/halfmd4.c

Directory: lib
```#include <linux/compiler.h>
#include <linux/export.h>
#include <linux/cryptohash.h>
#include <linux/bitops.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 = rol32(a, 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 */
}
ContributorsPersonTokensPropCommitsCommitPropmatt mackallmatt mackall613100.00%2100.00%
Total613100.00%2100.00%

EXPORT_SYMBOL(half_md4_transform);
Overall ContributorsPersonTokensPropCommitsCommitPropmatt mackallmatt mackall69299.14%240.00%
alexander kuleshovalexander kuleshov40.57%120.00%
rasmus villemoesrasmus villemoes10.14%120.00%
paul gortmakerpaul gortmaker10.14%120.00%
Total698100.00%5100.00%
Directory: lib

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```