Commit | Line | Data |
---|---|---|
5b62e993 MW |
1 | /* 19970320, overlap allowed 19970406 */ |
2 | ||
3 | #include "surf.h" | |
4 | #include "uint32.h" | |
5 | ||
6 | #define ROTATE(x,b) (((x) << (b)) | ((x) >> (32 - (b)))) | |
7 | #define MUSH(i,b) x = t[i] += (((x ^ seed[i]) + sum) ^ ROTATE(x,b)); | |
8 | ||
9 | void surf(out,in,seed) | |
10 | uint32 out[8]; uint32 in[12]; uint32 seed[32]; | |
11 | { | |
12 | uint32 t[12]; uint32 x; uint32 sum = 0; | |
13 | int r; int i; int loop; | |
14 | ||
15 | for (i = 0;i < 12;++i) t[i] = in[i] ^ seed[12 + i]; | |
16 | for (i = 0;i < 8;++i) out[i] = seed[24 + i]; | |
17 | x = t[11]; | |
18 | for (loop = 0;loop < 2;++loop) { | |
19 | for (r = 0;r < 16;++r) { | |
20 | sum += 0x9e3779b9; | |
21 | MUSH(0,5) MUSH(1,7) MUSH(2,9) MUSH(3,13) | |
22 | MUSH(4,5) MUSH(5,7) MUSH(6,9) MUSH(7,13) | |
23 | MUSH(8,5) MUSH(9,7) MUSH(10,9) MUSH(11,13) | |
24 | } | |
25 | for (i = 0;i < 8;++i) out[i] ^= t[i + 4]; | |
26 | } | |
27 | } |