1 /* 19970320, overlap allowed 19970406 */
2
3 #include "surf.h"
4
5 #define ROTATE(x,b) (((x) << (b)) | ((x) >> (32 - (b))))
6 #define MUSH(i,b) x = t[i] += (((x ^ seed[i]) + sum) ^ ROTATE(x,b));
7
surf(uint32 out[8],const uint32 in[12],const uint32 seed[32])8 void surf(uint32 out[8],const uint32 in[12],const uint32 seed[32])
9 {
10 uint32 t[12]; uint32 x; uint32 sum = 0;
11 int r; int i; int loop;
12
13 for (i = 0;i < 12;++i) t[i] = in[i] ^ seed[12 + i];
14 for (i = 0;i < 8;++i) out[i] = seed[24 + i];
15 x = t[11];
16 for (loop = 0;loop < 2;++loop) {
17 for (r = 0;r < 16;++r) {
18 sum += 0x9e3779b9;
19 MUSH(0,5) MUSH(1,7) MUSH(2,9) MUSH(3,13)
20 MUSH(4,5) MUSH(5,7) MUSH(6,9) MUSH(7,13)
21 MUSH(8,5) MUSH(9,7) MUSH(10,9) MUSH(11,13)
22 }
23 for (i = 0;i < 8;++i) out[i] ^= t[i + 4];
24 }
25 }
26