memcpy(ovec,ovec+num,8);
memmove(ovec,ovec+num,8);
void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,		     long length, DES_key_schedule *schedule, DES_cblock *ivec,		     int enc)	{	register DES_LONG d0,d1,v0,v1;	register unsigned long l=length;	register int num=numbits/8,n=(numbits+7)/8,i,rem=numbits%8;	DES_LONG ti[2];	unsigned char *iv;#ifndef L_ENDIAN	unsigned char ovec[16];#else	unsigned int  sh[4];	unsigned char *ovec=(unsigned char *)sh;	/* I kind of count that compiler optimizes away this assertioni,*/	assert (sizeof(sh[0])==4);	/* as this holds true for all,	*/					/* but 16-bit platforms...	*/					#endif	if (numbits<=0 || numbits > 64) return;	iv = &(*ivec)[0];	c2l(iv,v0);	c2l(iv,v1);	if (enc)		{		while (l >= (unsigned long)n)			{			l-=n;			ti[0]=v0;			ti[1]=v1;			DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);			c2ln(in,d0,d1,n);			in+=n;			d0^=ti[0];			d1^=ti[1];			l2cn(d0,d1,out,n);			out+=n;			/* 30-08-94 - eay - changed because l>>32 and			 * l<<32 are bad under gcc :-( */			if (numbits == 32)				{ v0=v1; v1=d0; }			else if (numbits == 64)				{ v0=d0; v1=d1; }			else				{#ifndef L_ENDIAN				iv=&ovec[0];				l2c(v0,iv);				l2c(v1,iv);				l2c(d0,iv);				l2c(d1,iv);#else				sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;#endif				if (rem==0)					memcpy(ovec,ovec+num,8);				else					for(i=0 ; i < 8 ; ++i)						ovec[i]=ovec[i+num]<<rem |							ovec[i+num+1]>>(8-rem);#ifdef L_ENDIAN				v0=sh[0], v1=sh[1];#else				iv=&ovec[0];				c2l(iv,v0);				c2l(iv,v1);#endif				}			}		}	else		{		while (l >= (unsigned long)n)			{			l-=n;			ti[0]=v0;			ti[1]=v1;			DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);			c2ln(in,d0,d1,n);			in+=n;			/* 30-08-94 - eay - changed because l>>32 and			 * l<<32 are bad under gcc :-( */			if (numbits == 32)				{ v0=v1; v1=d0; }			else if (numbits == 64)				{ v0=d0; v1=d1; }			else				{#ifndef L_ENDIAN				iv=&ovec[0];				l2c(v0,iv);				l2c(v1,iv);				l2c(d0,iv);				l2c(d1,iv);#else				sh[0]=v0, sh[1]=v1, sh[2]=d0, sh[3]=d1;#endif				if (rem==0)					memcpy (ovec,ovec+num,8);				else					for(i=0 ; i < 8 ; ++i)						ovec[i]=ovec[i+num]<<rem |							ovec[i+num+1]>>(8-rem);#ifdef L_ENDIAN				v0=sh[0], v1=sh[1];#else				iv=&ovec[0];				c2l(iv,v0);				c2l(iv,v1);#endif				}			d0^=ti[0];			d1^=ti[1];			l2cn(d0,d1,out,n);			out+=n;			}		}	iv = &(*ivec)[0];	l2c(v0,iv);	l2c(v1,iv);	v0=v1=d0=d1=ti[0]=ti[1]=0;	}