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      1 /* $OpenBSD: verify.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */
      2 
      3 /*
      4  * Public Domain, Author: Daniel J. Bernstein
      5  * Copied from nacl-20110221/crypto_verify/32/ref/verify.c
      6  */
      7 
      8 #include "includes.h"
      9 
     10 #include "crypto_api.h"
     11 
     12 int crypto_verify_32(const unsigned char *x,const unsigned char *y)
     13 {
     14   unsigned int differentbits = 0;
     15 #define F(i) differentbits |= x[i] ^ y[i];
     16   F(0)
     17   F(1)
     18   F(2)
     19   F(3)
     20   F(4)
     21   F(5)
     22   F(6)
     23   F(7)
     24   F(8)
     25   F(9)
     26   F(10)
     27   F(11)
     28   F(12)
     29   F(13)
     30   F(14)
     31   F(15)
     32   F(16)
     33   F(17)
     34   F(18)
     35   F(19)
     36   F(20)
     37   F(21)
     38   F(22)
     39   F(23)
     40   F(24)
     41   F(25)
     42   F(26)
     43   F(27)
     44   F(28)
     45   F(29)
     46   F(30)
     47   F(31)
     48   return (1 & ((differentbits - 1) >> 8)) - 1;
     49 }
     50