serval-dna/nacl/nacl-20110221/curvecp/byte_isequal.c

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#include "byte.h"
int byte_isequal(const void *yv,long long ylen,const void *xv)
{
const unsigned char *y = yv;
const unsigned char *x = xv;
unsigned char diff = 0;
while (ylen > 0) { diff |= (*y++ ^ *x++); --ylen; }
return (256 - (unsigned int) diff) >> 8;
}