release/src/router/dnscrypt/src/libnacl/crypto_verify/32/ref/verify.c

   1 #include "crypto_verify.h"
   2
   3 int crypto_verify(const unsigned char *x,const unsigned char *y)
   4 {
   5   unsigned int differentbits = 0;
   6 #define F(i) differentbits |= x[i] ^ y[i];
   7   F(0)
   8   F(1)
   9   F(2)
  10   F(3)
  11   F(4)
  12   F(5)
  13   F(6)
  14   F(7)
  15   F(8)
  16   F(9)
  17   F(10)
  18   F(11)
  19   F(12)
  20   F(13)
  21   F(14)
  22   F(15)
  23   F(16)
  24   F(17)
  25   F(18)
  26   F(19)
  27   F(20)
  28   F(21)
  29   F(22)
  30   F(23)
  31   F(24)
  32   F(25)
  33   F(26)
  34   F(27)
  35   F(28)
  36   F(29)
  37   F(30)
  38   F(31)
  39   return (1 & ((differentbits - 1) >> 8)) - 1;
  40 }