// misc.cpp - written and placed in the public domain by Wei Dai#include "pch.h"#include "misc.h"#include "words.h"NAMESPACE_BEGIN(CryptoPP)byte OAEP_P_DEFAULT[1];template<> void ByteReverse(word16 *, const word16 *, unsigned int);template<> void ByteReverse(word32 *, const word32 *, unsigned int);#ifdef WORD64_AVAILABLEtemplate<> void ByteReverse(word64 *, const word64 *, unsigned int);#endifvoid xorbuf(byte *buf, const byte *mask, unsigned int count){	if (((unsigned int)buf | (unsigned int)mask | count) % WORD_SIZE == 0)		XorWords((word *)buf, (const word *)mask, count/WORD_SIZE);	else	{		for (unsigned int i=0; i<count; i++)			buf[i] ^= mask[i];	}}void xorbuf(byte *output, const byte *input, const byte *mask, unsigned int count){	if (((unsigned int)output | (unsigned int)input | (unsigned int)mask | count) % WORD_SIZE == 0)		XorWords((word *)output, (const word *)input, (const word *)mask, count/WORD_SIZE);	else	{		for (unsigned int i=0; i<count; i++)			output[i] = input[i] ^ mask[i];	}}unsigned int Parity(unsigned long value){	for (unsigned int i=8*sizeof(value)/2; i>0; i/=2)		value ^= value >> i;	return (unsigned int)value&1;}unsigned int BytePrecision(unsigned long value){	unsigned int i;	for (i=sizeof(value); i; --i)		if (value >> (i-1)*8)			break;	return i;}unsigned int BitPrecision(unsigned long value){	if (!value)		return 0;	unsigned int l=0, h=8*sizeof(value);	while (h-l > 1)	{		unsigned int t = (l+h)/2;		if (value >> t)			l = t;		else			h = t;	}	return h;}unsigned long Crop(unsigned long value, unsigned int size){	if (size < 8*sizeof(value))    	return (value & ((1L << size) - 1));	else		return value;}NAMESPACE_END