Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/lib/halfmd4.c

  1 #include <linux/compiler.h>
  2 #include <linux/export.h>
  3 #include <linux/cryptohash.h>
  4 #include <linux/bitops.h>
  5 
  6 /* F, G and H are basic MD4 functions: selection, majority, parity */
  7 #define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
  8 #define G(x, y, z) (((x) & (y)) + (((x) ^ (y)) & (z)))
  9 #define H(x, y, z) ((x) ^ (y) ^ (z))
 10 
 11 /*
 12  * The generic round function.  The application is so specific that
 13  * we don't bother protecting all the arguments with parens, as is generally
 14  * good macro practice, in favor of extra legibility.
 15  * Rotation is separate from addition to prevent recomputation
 16  */
 17 #define ROUND(f, a, b, c, d, x, s)      \
 18         (a += f(b, c, d) + x, a = rol32(a, s))
 19 #define K1 0
 20 #define K2 013240474631UL
 21 #define K3 015666365641UL
 22 
 23 /*
 24  * Basic cut-down MD4 transform.  Returns only 32 bits of result.
 25  */
 26 __u32 half_md4_transform(__u32 buf[4], __u32 const in[8])
 27 {
 28         __u32 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 29 
 30         /* Round 1 */
 31         ROUND(F, a, b, c, d, in[0] + K1,  3);
 32         ROUND(F, d, a, b, c, in[1] + K1,  7);
 33         ROUND(F, c, d, a, b, in[2] + K1, 11);
 34         ROUND(F, b, c, d, a, in[3] + K1, 19);
 35         ROUND(F, a, b, c, d, in[4] + K1,  3);
 36         ROUND(F, d, a, b, c, in[5] + K1,  7);
 37         ROUND(F, c, d, a, b, in[6] + K1, 11);
 38         ROUND(F, b, c, d, a, in[7] + K1, 19);
 39 
 40         /* Round 2 */
 41         ROUND(G, a, b, c, d, in[1] + K2,  3);
 42         ROUND(G, d, a, b, c, in[3] + K2,  5);
 43         ROUND(G, c, d, a, b, in[5] + K2,  9);
 44         ROUND(G, b, c, d, a, in[7] + K2, 13);
 45         ROUND(G, a, b, c, d, in[0] + K2,  3);
 46         ROUND(G, d, a, b, c, in[2] + K2,  5);
 47         ROUND(G, c, d, a, b, in[4] + K2,  9);
 48         ROUND(G, b, c, d, a, in[6] + K2, 13);
 49 
 50         /* Round 3 */
 51         ROUND(H, a, b, c, d, in[3] + K3,  3);
 52         ROUND(H, d, a, b, c, in[7] + K3,  9);
 53         ROUND(H, c, d, a, b, in[2] + K3, 11);
 54         ROUND(H, b, c, d, a, in[6] + K3, 15);
 55         ROUND(H, a, b, c, d, in[1] + K3,  3);
 56         ROUND(H, d, a, b, c, in[5] + K3,  9);
 57         ROUND(H, c, d, a, b, in[0] + K3, 11);
 58         ROUND(H, b, c, d, a, in[4] + K3, 15);
 59 
 60         buf[0] += a;
 61         buf[1] += b;
 62         buf[2] += c;
 63         buf[3] += d;
 64 
 65         return buf[1]; /* "most hashed" word */
 66 }
 67 EXPORT_SYMBOL(half_md4_transform);
 68 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us