desCode.h

/* desCode.h
 *
 * $Id$ */

/*	des - fast & portable DES encryption & decryption.
 *	Copyright (C) 1992  Dana L. How
 *	Please see the file `descore.README' for the complete copyright notice.
 */

#include "des.h"

extern const uint32_t des_keymap[];
extern const uint32_t des_bigmap[];

/* optional customization:
 * the idea here is to alter the code so it will still run correctly
 * on any machine,  but the quickest on the specific machine in mind.
 * note that these silly tweaks can give you a 15%-20% speed improvement
 * on the sparc -- it's probably even more significant on the 68000. */

/* take care of machines with incredibly few registers */
#if	defined(i386)
#define	REGISTER		/* only x, y, z will be declared register */
#else
#define	REGISTER	register
#endif	/* i386 */

/* is auto inc/dec faster than 7bit unsigned indexing? */
#if	defined(vax) || defined(mc68000)
#define	FIXR		r += 32;
#define	FIXS		s +=  8;
#define	PREV(v,o)	*--v
#define	NEXT(v,o)	*v++
#else
#define	FIXR
#define	FIXS
#define	PREV(v,o)	v[o]
#define	NEXT(v,o)	v[o]
#endif

/* if no machine type, default is indexing, 6 registers and cheap literals */
#if	!defined(i386) && !defined(vax) && !defined(mc68000) && !defined(sparc)
#define	vax
#endif


/* handle a compiler which can't reallocate registers */
/* The BYTE type is used as parameter for the encrypt/decrypt functions.
 * It's pretty bad to have the function prototypes depend on
 * a macro definition that the users of the function doesn't
 * know about. /Niels */
#if	0			/* didn't feel like deleting */
#define	SREGFREE	; s = (uint8_t *) D
#define	DEST		s
#define	D		m0
#define	BYTE		uint32_t
#else
#define	SREGFREE
#define	DEST		d
#define	D		d
#define	BYTE		uint8_t
#endif

/* handle constants in the optimal way for 386 & vax */
/* 386: we declare 3 register variables (see above) and use 3 more variables;
 * vax: we use 6 variables, all declared register;
 * we assume address literals are cheap & unrestricted;
 * we assume immediate constants are cheap & unrestricted. */
#if	defined(i386) || defined(vax)
#define	MQ0	 des_bigmap