| 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 | } |