while (l >= n)
while (l >= (unsigned long)n)
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,n=(numbits+7)/8,i;	DES_LONG ti[2];	unsigned char *iv;	unsigned char ovec[16];	if (num > 64) return;	iv = &(*ivec)[0];	c2l(iv,v0);	c2l(iv,v1);	if (enc)		{		while (l >= 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 (num == 32)				{ v0=v1; v1=d0; }			else if (num == 64)				{ v0=d0; v1=d1; }			else				{				iv=&ovec[0];				l2c(v0,iv);				l2c(v1,iv);				l2c(d0,iv);				l2c(d1,iv);				/* shift ovec left most of the bits... */				memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));				/* now the remaining bits */				if(num%8 != 0)					for(i=0 ; i < 8 ; ++i)						{						ovec[i]<<=num%8;						ovec[i]|=ovec[i+1]>>(8-num%8);						}				iv=&ovec[0];				c2l(iv,v0);				c2l(iv,v1);				}			}		}	else		{		while (l >= 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 (num == 32)				{ v0=v1; v1=d0; }			else if (num == 64)				{ v0=d0; v1=d1; }			else				{				iv=&ovec[0];				l2c(v0,iv);				l2c(v1,iv);				l2c(d0,iv);				l2c(d1,iv);				/* shift ovec left most of the bits... */				memmove(ovec,ovec+num/8,8+(num%8 ? 1 : 0));				/* now the remaining bits */				if(num%8 != 0)					for(i=0 ; i < 8 ; ++i)						{						ovec[i]<<=num%8;						ovec[i]|=ovec[i+1]>>(8-num%8);						}				iv=&ovec[0];				c2l(iv,v0);				c2l(iv,v1);				}			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;	}