d3des.cpp

3DES数据加密类的实现

		*cook++ |= (*raw1 & 0x00000fc0L) >> 6;
		*cook	 = (*raw0 & 0x0003f000L) << 12;
		*cook	|= (*raw0 & 0x0000003fL) << 16;
		*cook	|= (*raw1 & 0x0003f000L) >> 4;
		*cook++ |= (*raw1 & 0x0000003fL);
	}
	usekey(dough);	
	return;
}
void cyph::usekey(unsigned long *from)
{	
	register unsigned long *to, *endp;
	to = KnL, endp = &KnL[32];
	while( to < endp ) *to++ = *from++;
	return;
}
//*******************************************************************************************
 void cyph::scrunch(unsigned char *outof, unsigned long *into)
{
	*into	 = (*outof++ & 0xffL) << 24;
	*into	|= (*outof++ & 0xffL) << 16;
	*into	|= (*outof++ & 0xffL) << 8;
	*into++ |= (*outof++ & 0xffL);
	*into	 = (*outof++ & 0xffL) << 24;
	*into	|= (*outof++ & 0xffL) << 16;
	*into	|= (*outof++ & 0xffL) << 8;
	*into	|= (*outof   & 0xffL);
	return;
}
void cyph::desfunc(unsigned long *block, unsigned long *keys)
{
unsigned long fval, work, right, leftt;			
	leftt = block[0];
	right = block[1];
	work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;
	right ^= work;
	leftt ^= (work << 4);
	work = ((leftt >> 16) ^ right) & 0x0000ffffL;
	right ^= work;
	leftt ^= (work << 16);
	work = ((right >> 2) ^ leftt) & 0x33333333L;
	leftt ^= work;
	right ^= (work << 2);
	work = ((right >> 8) ^ leftt) & 0x00ff00ffL;
	leftt ^= work;
	right ^= (work << 8);
	right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL;
	work = (leftt ^ right) & 0xaaaaaaaaL;
	leftt ^= work;
	right ^= work;
	leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;			
	for( int round = 0; round < 8; round++ )
	{
		work  = (right << 28) | (right >> 4);
		work ^= *keys++;
		fval  = SP7[ work		 & 0x3fL];
		fval |= SP5[(work >>  8) & 0x3fL];
		fval |= SP3[(work >> 16) & 0x3fL];
		fval |= SP1[(work >> 24) & 0x3fL];
		work  = right ^ *keys++;
		fval |= SP8[ work		 & 0x3fL];
		fval |= SP6[(work >>  8) & 0x3fL];
		fval |= SP4[(work >> 16) & 0x3fL];
		fval |= SP2[(work >> 24) & 0x3fL];
		leftt ^= fval;
		work  = (leftt << 28) | (leftt >> 4);
		work ^= *keys++;
		fval  = SP7[ work		 & 0x3fL];
		fval |= SP5[(work >>  8) & 0x3fL];
		fval |= SP3[(work >> 16) & 0x3fL];
		fval |= SP1[(work >> 24) & 0x3fL];
		work  = leftt ^ *keys++;
		fval |= SP8[ work		 & 0x3fL];
		fval |= SP6[(work >>  8) & 0x3fL];
		fval |= SP4[(work >> 16) & 0x3fL];
		fval |= SP2[(work >> 24) & 0x3fL];
		right ^= fval;
	}			
	right = (right << 31) | (right >> 1);
	work = (leftt ^ right) & 0xaaaaaaaaL;
	leftt ^= work;
	right ^= work;
	leftt = (leftt << 31) | (leftt >> 1);
	work = ((leftt >> 8) ^ right) & 0x00ff00ffL;
	right ^= work;
	leftt ^= (work << 8);
	work = ((leftt >> 2) ^ right) & 0x33333333L;
	right ^= work;
	leftt ^= (work << 2);
	work = ((right >> 16) ^ leftt) & 0x0000ffffL;
	leftt ^= work;
	right ^= (work << 16);
	work = ((right >> 4) ^ leftt) & 0x0f0f0f0fL;
	leftt ^= work;
	right ^= (work << 4);
	*block++ = right;
	*block = leftt;
	return;
}
void cyph::unscrun(unsigned long *outof, unsigned char *into)
{	
	*into++ = (*outof >> 24) & 0xffL;
	*into++ = (*outof >> 16) & 0xffL;
	*into++ = (*outof >>  8) & 0xffL;
	*into++ =  *outof++	 & 0xffL;
	*into++ = (*outof >> 24) & 0xffL;
	*into++ = (*outof >> 16) & 0xffL;
	*into++ = (*outof >>  8) & 0xffL;
	*into	=  *outof	 & 0xffL;
	return;
}
void cyph::des(unsigned char *inblock, unsigned char *outblock)
{
	unsigned long work[2];
	scrunch(inblock, work);
	desfunc(work, KnL);
	unscrun(work, outblock);	
	return;
}
void cyph::cpkey(unsigned long *into)
{
	unsigned long *from, *endp;	
	from = KnL, endp = &KnL[32];
	while( from < endp ) *into++ = *from++;
	return;
}
//******************************************************************************************
void cyph::des3key(	unsigned char *hexkey, short mode)
{
	unsigned char *first, *third;
	short revmod;
	if( mode == EN0 ) 
	{
		revmod = DE1;
		first = hexkey;
		third = &hexkey[16];
	}
	else 
	{
		revmod = EN0;
		first = &hexkey[16];
		third = hexkey;
	}
	deskey(&hexkey[8], revmod);
    cpkey(KnR);
	deskey(third, mode);
	cpkey(Kn3);
	deskey(first, mode);
	return;
}
//************************************************************************************
void cyph::cp3key(unsigned long *into)
{
	unsigned long *from, *endp;
	cpkey(into);
	into = &into[32];
	from = KnR, endp = &KnR[32];
	while( from < endp ) *into++ = *from++;
	from = Kn3, endp = &Kn3[32];
	while( from < endp ) *into++ = *from++;
	return;
}
void cyph::use3key(unsigned long *from)		
{	
	unsigned long *to, *endp;
	usekey(from);
	from = &from[32];
	to = KnR, endp = &KnR[32];
	while( to < endp ) *to++ = *from++;
	to = Kn3, endp = &Kn3[32];
	while( to < endp ) *to++ = *from++;
	return;
}
//************************************************************************************
void cyph::D3des(unsigned char *from, unsigned char *into)		
{			
	unsigned long swap, leftt[2], middl[2], right[2];			
	scrunch(from, leftt);
	scrunch(&from[8], middl);
	scrunch(&from[16], right);
	desfunc(leftt, KnL);
	desfunc(middl, KnL);
	desfunc(right, KnL);
	swap = leftt[1];
	leftt[1] = middl[0];
	middl[0] = swap;
	swap = middl[1];
	middl[1] = right[0];
	right[0] = swap;
	desfunc(leftt, KnR);
	desfunc(middl, KnR);
	desfunc(right, KnR);
	swap = leftt[1];
	leftt[1] = middl[0];
	middl[0] = swap;
	swap = middl[1];
	middl[1] = right[0];
	right[0] = swap;
	desfunc(leftt, Kn3);
	desfunc(middl, Kn3);
	desfunc(right, Kn3);
	unscrun(leftt, into);
	unscrun(middl, &into[8]);
	unscrun(right, &into[16]);
	return;
}
void cyph::make3key(char *aptr, unsigned char *kptr)
{		
	unsigned char *store;
	int first, i;
	unsigned long savek[96];			
	cp3key(savek);
	des3key(Df_Key, EN0);
	for( i = 0; i < 24; i++ ) kptr[i] = Df_Key[i];
	first = 1;
	while( (*aptr != '\0') || first ) 
	{
		store = kptr;
		for( i = 0; i < 24 && (*aptr != '\0'); i++ )
		{
			*store++ ^= *aptr & 0x7f;
			*aptr++ = '\0';
		}
		D3des(kptr, kptr);
		first = 0;
	}
	use3key(savek);
	
	return;
}
cyph::cyph()
{
	initiall();	
}		
cyph::~cyph()
{
			
}