des_crypt.c

操作系统SunOS 4.1.3版本的源码

#if !defined(lint) && defined(SCCSIDS)
static char sccsid[] = "@(#)des_crypt.c 1.1 92/08/04 (C) 1987 Sun Micro";
#endif

/*
 * des_crypt.c, DES encryption library routines
 * Copyright (C) 1986, Sun Microsystems, Inc.
 */


#include <sys/types.h>
#include <des/des_crypt.h>
#ifdef sun
#	include <sys/ioctl.h>
#	include <sys/des.h>
#	ifdef KERNEL
#		include <sys/conf.h>
#		define getdesfd() (cdevsw[11].d_open(0, 0) ? -1 : 0)
#		define ioctl(a, b, c) (cdevsw[11].d_ioctl(0, b, c, 0) ? -1 : 0)
#			define _des_crypt(a, b, c) 0
#	else
#		define getdesfd()	(open("/dev/des", 0, 0))
#	endif
#endif

/*
 * To see if chip is installed
 */
#define	UNOPENED (-2)
static int g_desfd = UNOPENED;


/*
 * Copy 8 bytes
 */
#define	COPY8(src, dst) { \
	register char *a = (char *) dst; \
	register char *b = (char *) src; \
	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
	*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
}

/*
 * Copy multiple of 8 bytes
 */
#define	DESCOPY(src, dst, len) { \
	register char *a = (char *) dst; \
	register char *b = (char *) src; \
	register int i; \
	for (i = (int) len; i > 0; i -= 8) { \
		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
		*a++ = *b++; *a++ = *b++; *a++ = *b++; *a++ = *b++; \
	} \
}

/*
 * CBC mode encryption
 */
cbc_crypt(key, buf, len, mode, ivec)
	char *key;
	char *buf;
	unsigned len;
	unsigned mode;
	char *ivec;
{
	int err;
	struct desparams dp;

	dp.des_mode = CBC;
	COPY8(ivec, dp.des_ivec);
	err = common_crypt(key, buf, len, mode, &dp);
	COPY8(dp.des_ivec, ivec);
	return (err);
}


/*
 * ECB mode encryption
 */
ecb_crypt(key, buf, len, mode)
	char *key;
	char *buf;
	unsigned len;
	unsigned mode;
{
	struct desparams dp;

	dp.des_mode = ECB;
	return (common_crypt(key, buf, len, mode, &dp));
}



/*
 * Common code to cbc_crypt() & ecb_crypt()
 */
static
common_crypt(key, buf, len, mode, desp)
	char *key;
	char *buf;
	register unsigned len;
	unsigned mode;
	register struct desparams *desp;
{
	register int desdev;
	register int res;

	if ((len % 8) != 0 || len > DES_MAXDATA) {
		return (DESERR_BADPARAM);
	}
	desp->des_dir =
		((mode & DES_DIRMASK) == DES_ENCRYPT) ? ENCRYPT : DECRYPT;

	desdev = mode & DES_DEVMASK;
	COPY8(key, desp->des_key);
#ifdef sun
	if (desdev == DES_HW) {
		if (g_desfd < 0) {
			if (g_desfd == -1 || (g_desfd = getdesfd()) < 0) {
				goto software;	/* no hardware device */
			}
		}

		/*
		 * hardware
		 */
		desp->des_len = len;
		if (len <= DES_QUICKLEN) {
			DESCOPY(buf, desp->des_data, len);
			res = ioctl(g_desfd, DESIOCQUICK, (char *) desp);
			DESCOPY(desp->des_data, buf, len);
		} else {
			desp->des_buf = (u_char *) buf;
			res = ioctl(g_desfd, DESIOCBLOCK, (char *) desp);
		}
		return (res == 0 ? DESERR_NONE : DESERR_HWERROR);
	}
software:
#endif
	/*
	 * software
	 */
#ifdef CRYPT
	if (!_des_crypt(buf, len, desp)) {
		return (DESERR_HWERROR);
	}
	return (desdev == DES_SW ? DESERR_NONE : DESERR_NOHWDEVICE);
#else
	return (DESERR_HWERROR);
#endif CRYPT
}