| Damien Miller | 8a56dc2 | 2013-12-18 17:48:11 +1100 | [diff] [blame] | 1 | /* $OpenBSD: verify.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */ |
| Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 2 | |
| Damien Miller | 8a56dc2 | 2013-12-18 17:48:11 +1100 | [diff] [blame] | 3 | /* |
| 4 | * Public Domain, Author: Daniel J. Bernstein |
| 5 | * Copied from nacl-20110221/crypto_verify/32/ref/verify.c |
| 6 | */ |
| Damien Miller | 5be9d9e | 2013-12-07 11:24:01 +1100 | [diff] [blame] | 7 | |
| 8 | #include "crypto_api.h" |
| 9 | |
| 10 | int crypto_verify_32(const unsigned char *x,const unsigned char *y) |
| 11 | { |
| 12 | unsigned int differentbits = 0; |
| 13 | #define F(i) differentbits |= x[i] ^ y[i]; |
| 14 | F(0) |
| 15 | F(1) |
| 16 | F(2) |
| 17 | F(3) |
| 18 | F(4) |
| 19 | F(5) |
| 20 | F(6) |
| 21 | F(7) |
| 22 | F(8) |
| 23 | F(9) |
| 24 | F(10) |
| 25 | F(11) |
| 26 | F(12) |
| 27 | F(13) |
| 28 | F(14) |
| 29 | F(15) |
| 30 | F(16) |
| 31 | F(17) |
| 32 | F(18) |
| 33 | F(19) |
| 34 | F(20) |
| 35 | F(21) |
| 36 | F(22) |
| 37 | F(23) |
| 38 | F(24) |
| 39 | F(25) |
| 40 | F(26) |
| 41 | F(27) |
| 42 | F(28) |
| 43 | F(29) |
| 44 | F(30) |
| 45 | F(31) |
| 46 | return (1 & ((differentbits - 1) >> 8)) - 1; |
| 47 | } |