path: root/lib/libXdmcp/Wraphelp.c

/*
 * $Xorg: A8Eq.c,v 1.4 2001/02/09 02:03:48 xorgcvs Exp $
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <X11/Xmd.h>
#include "Wrap.h"

/* des routines for non-usa - eay 10/9/1991 eay@psych.psy.uq.oz.au
 * These routines were written for speed not size so they are bigger than
 * needed.  I have removed some of the loop unrolling, this will reduce
 * code size at the expense of some speed.
 * 25/9/1991 eay - much faster _XdmcpAuthSetup (4 times faster).
 * 19/9/1991 eay - cleaned up the IP and FP code.
 * 10/9/1991 eay - first release.
 * The des routines this file has been made from can be found in
 * ftp.psy.uq.oz.au /pub/DES
 * This particular version derived from OpenBSD Revsion 1.3.
 */

/*
 *
 * Export Requirements.
 * You may not export or re-export this software or any copy or
 * adaptation in violation of any applicable laws or regulations.
 *
 * Without limiting the generality of the foregoing, hardware, software,
 * technology or services provided under this license agreement may not
 * be exported, reexported, transferred or downloaded to or within (or to
 * a national resident of) countries under U.S. economic embargo
 * including the following countries:
 *
 * Cuba, Iran, Libya, North Korea, Sudan and Syria. This list is subject
 * to change.
 *
 * Hardware, software, technology or services may not be exported,
 * reexported, transferred or downloaded to persons or entities listed on
 * the U.S. Department of Commerce Denied Persons List, Entity List of
 * proliferation concern or on any U.S. Treasury Department Designated
 * Nationals exclusion list, or to parties directly or indirectly
 * involved in the development or production of nuclear, chemical,
 * biological weapons or in missile technology programs as specified in
 * the U.S. Export Administration Regulations (15 CFR 744).
 *
 * By accepting this license agreement you confirm that you are not
 * located in (or a national resident of) any country under U.S. economic
 * embargo, not identified on any U.S. Department of Commerce Denied
 * Persons List, Entity List or Treasury Department Designated Nationals
 * exclusion list, and not directly or indirectly involved in the
 * development or production of nuclear, chemical, biological weapons or
 * in missile technology programs as specified in the U.S. Export
 * Administration Regulations.
 * 
 * 
 * Local Country Import Requirements. The software you are about to
 * download contains cryptography technology. Some countries regulate the
 * import, use and/or export of certain products with cryptography. The
 * X.org Foundation makes no claims as to the applicability of local
 * country import, use and/or export regulations in relation to the
 * download of this product. If you are located outside the U.S. and
 * Canada you are advised to consult your local country regulations to
 * insure compliance.
 */

static const CARD32 skb[8][64] = {
	/* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
	{ 0x00000000,0x00000010,0x20000000,0x20000010,
	  0x00010000,0x00010010,0x20010000,0x20010010,
	  0x00000800,0x00000810,0x20000800,0x20000810,
	  0x00010800,0x00010810,0x20010800,0x20010810,
	  0x00000020,0x00000030,0x20000020,0x20000030,
	  0x00010020,0x00010030,0x20010020,0x20010030,
	  0x00000820,0x00000830,0x20000820,0x20000830,
	  0x00010820,0x00010830,0x20010820,0x20010830,
	  0x00080000,0x00080010,0x20080000,0x20080010,
	  0x00090000,0x00090010,0x20090000,0x20090010,
	  0x00080800,0x00080810,0x20080800,0x20080810,
	  0x00090800,0x00090810,0x20090800,0x20090810,
	  0x00080020,0x00080030,0x20080020,0x20080030,
	  0x00090020,0x00090030,0x20090020,0x20090030,
	  0x00080820,0x00080830,0x20080820,0x20080830,
	  0x00090820,0x00090830,0x20090820,0x20090830 },
	/* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
	{ 0x00000000,0x02000000,0x00002000,0x02002000,
	  0x00200000,0x02200000,0x00202000,0x02202000,
	  0x00000004,0x02000004,0x00002004,0x02002004,
	  0x00200004,0x02200004,0x00202004,0x02202004,
	  0x00000400,0x02000400,0x00002400,0x02002400,
	  0x00200400,0x02200400,0x00202400,0x02202400,
	  0x00000404,0x02000404,0x00002404,0x02002404,
	  0x00200404,0x02200404,0x00202404,0x02202404,
	  0x10000000,0x12000000,0x10002000,0x12002000,
	  0x10200000,0x12200000,0x10202000,0x12202000,
	  0x10000004,0x12000004,0x10002004,0x12002004,
	  0x10200004,0x12200004,0x10202004,0x12202004,
	  0x10000400,0x12000400,0x10002400,0x12002400,
	  0x10200400,0x12200400,0x10202400,0x12202400,
	  0x10000404,0x12000404,0x10002404,0x12002404,
	  0x10200404,0x12200404,0x10202404,0x12202404 },
	/* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
	{ 0x00000000,0x00000001,0x00040000,0x00040001,
	  0x01000000,0x01000001,0x01040000,0x01040001,
	  0x00000002,0x00000003,0x00040002,0x00040003,
	  0x01000002,0x01000003,0x01040002,0x01040003,
	  0x00000200,0x00000201,0x00040200,0x00040201,
	  0x01000200,0x01000201,0x01040200,0x01040201,
	  0x00000202,0x00000203,0x00040202,0x00040203,
	  0x01000202,0x01000203,0x01040202,0x01040203,
	  0x08000000,0x08000001,0x08040000,0x08040001,
	  0x09000000,0x09000001,0x09040000,0x09040001,
	  0x08000002,0x08000003,0x08040002,0x08040003,
	  0x09000002,0x09000003,0x09040002,0x09040003,
	  0x08000200,0x08000201,0x08040200,0x08040201,
	  0x09000200,0x09000201,0x09040200,0x09040201,
	  0x08000202,0x08000203,0x08040202,0x08040203,
	  0x09000202,0x09000203,0x09040202,0x09040203 },
	/* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
	{ 0x00000000,0x00100000,0x00000100,0x00100100,
	  0x00000008,0x00100008,0x00000108,0x00100108,
	  0x00001000,0x00101000,0x00001100,0x00101100,
	  0x00001008,0x00101008,0x00001108,0x00101108,
	  0x04000000,0x04100000,0x04000100,0x04100100,
	  0x04000008,0x04100008,0x04000108,0x04100108,
	  0x04001000,0x04101000,0x04001100,0x04101100,
	  0x04001008,0x04101008,0x04001108,0x04101108,
	  0x00020000,0x00120000,0x00020100,0x00120100,
	  0x00020008,0x00120008,0x00020108,0x00120108,
	  0x00021000,0x00121000,0x00021100,0x00121100,
	  0x00021008,0x00121008,0x00021108,0x00121108,
	  0x04020000,0x04120000,0x04020100,0x04120100,
	  0x04020008,0x04120008,0x04020108,0x04120108,
	  0x04021000,0x04121000,0x04021100,0x04121100,
	  0x04021008,0x04121008,0x04021108,0x04121108 },
	/* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
	{ 0x00000000,0x10000000,0x00010000,0x10010000,
	  0x00000004,0x10000004,0x00010004,0x10010004,
	  0x20000000,0x30000000,0x20010000,0x30010000,
	  0x20000004,0x30000004,0x20010004,0x30010004,
	  0x00100000,0x10100000,0x00110000,0x10110000,
	  0x00100004,0x10100004,0x00110004,0x10110004,
	  0x20100000,0x30100000,0x20110000,0x30110000,
	  0x20100004,0x30100004,0x20110004,0x30110004,
	  0x00001000,0x10001000,0x00011000,0x10011000,
	  0x00001004,0x10001004,0x00011004,0x10011004,
	  0x20001000,0x30001000,0x20011000,0x30011000,
	  0x20001004,0x30001004,0x20011004,0x30011004,
	  0x00101000,0x10101000,0x00111000,0x10111000,
	  0x00101004,0x10101004,0x00111004,0x10111004,
	  0x20101000,0x30101000,0x20111000,0x30111000,
	  0x20101004,0x30101004,0x20111004,0x30111004 },
	/* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
	{ 0x00000000,0x08000000,0x00000008,0x08000008,
	  0x00000400,0x08000400,0x00000408,0x08000408,
	  0x00020000,0x08020000,0x00020008,0x08020008,
	  0x00020400,0x08020400,0x00020408,0x08020408,
	  0x00000001,0x08000001,0x00000009,0x08000009,
	  0x00000401,0x08000401,0x00000409,0x08000409,
	  0x00020001,0x08020001,0x00020009,0x08020009,
	  0x00020401,0x08020401,0x00020409,0x08020409,
	  0x02000000,0x0A000000,0x02000008,0x0A000008,
	  0x02000400,0x0A000400,0x02000408,0x0A000408,
	  0x02020000,0x0A020000,0x02020008,0x0A020008,
	  0x02020400,0x0A020400,0x02020408,0x0A020408,
	  0x02000001,0x0A000001,0x02000009,0x0A000009,
	  0x02000401,0x0A000401,0x02000409,0x0A000409,
	  0x02020001,0x0A020001,0x02020009,0x0A020009,
	  0x02020401,0x0A020401,0x02020409,0x0A020409 },
	/* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
	{ 0x00000000,0x00000100,0x00080000,0x00080100,
	  0x01000000,0x01000100,0x01080000,0x01080100,
	  0x00000010,0x00000110,0x00080010,0x00080110,
	  0x01000010,0x01000110,0x01080010,0x01080110,
	  0x00200000,0x00200100,0x00280000,0x00280100,
	  0x01200000,0x01200100,0x01280000,0x01280100,
	  0x00200010,0x00200110,0x00280010,0x00280110,
	  0x01200010,0x01200110,0x01280010,0x01280110,
	  0x00000200,0x00000300,0x00080200,0x00080300,
	  0x01000200,0x01000300,0x01080200,0x01080300,
	  0x00000210,0x00000310,0x00080210,0x00080310,
	  0x01000210,0x01000310,0x01080210,0x01080310,
	  0x00200200,0x00200300,0x00280200,0x00280300,
	  0x01200200,0x01200300,0x01280200,0x01280300,
	  0x00200210,0x00200310,0x00280210,0x00280310,
	  0x01200210,0x01200310,0x01280210,0x01280310 },
	  /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
	{ 0x00000000,0x04000000,0x00040000,0x04040000,
	  0x00000002,0x04000002,0x00040002,0x04040002,
	  0x00002000,0x04002000,0x00042000,0x04042000,
	  0x00002002,0x04002002,0x00042002,0x04042002,
	  0x00000020,0x04000020,0x00040020,0x04040020,
	  0x00000022,0x04000022,0x00040022,0x04040022,
	  0x00002020,0x04002020,0x00042020,0x04042020,
	  0x00002022,0x04002022,0x00042022,0x04042022,
	  0x00000800,0x04000800,0x00040800,0x04040800,
	  0x00000802,0x04000802,0x00040802,0x04040802,
	  0x00002800,0x04002800,0x00042800,0x04042800,
	  0x00002802,0x04002802,0x00042802,0x04042802,
	  0x00000820,0x04000820,0x00040820,0x04040820,
	  0x00000822,0x04000822,0x00040822,0x04040822,
	  0x00002820,0x04002820,0x00042820,0x04042820,
	  0x00002822,0x04002822,0x00042822,0x04042822 }
};


static const CARD32 SPtrans[8][64] = {
	/* nibble 0 */
	{ 0x00410100, 0x00010000, 0x40400000, 0x40410100,
	  0x00400000, 0x40010100, 0x40010000, 0x40400000,
	  0x40010100, 0x00410100, 0x00410000, 0x40000100,
	  0x40400100, 0x00400000, 0x00000000, 0x40010000,
	  0x00010000, 0x40000000, 0x00400100, 0x00010100,
	  0x40410100, 0x00410000, 0x40000100, 0x00400100,
	  0x40000000, 0x00000100, 0x00010100, 0x40410000,
	  0x00000100, 0x40400100, 0x40410000, 0x00000000,
	  0x00000000, 0x40410100, 0x00400100, 0x40010000,
	  0x00410100, 0x00010000, 0x40000100, 0x00400100,
	  0x40410000, 0x00000100, 0x00010100, 0x40400000,
	  0x40010100, 0x40000000, 0x40400000, 0x00410000,
	  0x40410100, 0x00010100, 0x00410000, 0x40400100,
	  0x00400000, 0x40000100, 0x40010000, 0x00000000,
	  0x00010000, 0x00400000, 0x40400100, 0x00410100,
	  0x40000000, 0x40410000, 0x00000100, 0x40010100 },

	/* nibble 1 */
	{ 0x08021002, 0x00000000, 0x00021000, 0x08020000,
	  0x08000002, 0x00001002, 0x08001000, 0x00021000,
	  0x00001000, 0x08020002, 0x00000002, 0x08001000,
	  0x00020002, 0x08021000, 0x08020000, 0x00000002,
	  0x00020000, 0x08001002, 0x08020002, 0x00001000,
	  0x00021002, 0x08000000, 0x00000000, 0x00020002,
	  0x08001002, 0x00021002, 0x08021000, 0x08000002,
	  0x08000000, 0x00020000, 0x00001002, 0x08021002,
	  0x00020002, 0x08021000, 0x08001000, 0x00021002,
	  0x08021002, 0x00020002, 0x08000002, 0x00000000,
	  0x08000000, 0x00001002, 0x00020000, 0x08020002,
	  0x00001000, 0x08000000, 0x00021002, 0x08001002,
	  0x08021000, 0x00001000, 0x00000000, 0x08000002,
	  0x00000002, 0x08021002, 0x00021000, 0x08020000,
	  0x08020002, 0x00020000, 0x00001002, 0x08001000,
	  0x08001002, 0x00000002, 0x08020000, 0x00021000 },

	/* nibble 2 */
	{ 0x20800000, 0x00808020, 0x00000020, 0x20800020,
	  0x20008000, 0x00800000, 0x20800020, 0x00008020,
	  0x00800020, 0x00008000, 0x00808000, 0x20000000,
	  0x20808020, 0x20000020, 0x20000000, 0x20808000,
	  0x00000000, 0x20008000, 0x00808020, 0x00000020,
	  0x20000020, 0x20808020, 0x00008000, 0x20800000,
	  0x20808000, 0x00800020, 0x20008020, 0x00808000,
	  0x00008020, 0x00000000, 0x00800000, 0x20008020,
	  0x00808020, 0x00000020, 0x20000000, 0x00008000,
	  0x20000020, 0x20008000, 0x00808000, 0x20800020,
	  0x00000000, 0x00808020, 0x00008020, 0x20808000,
	  0x20008000, 0x00800000, 0x20808020, 0x20000000,
	  0x20008020, 0x20800000, 0x00800000, 0x20808020,
	  0x00008000, 0x00800020, 0x20800020, 0x00008020,
	  0x00800020, 0x00000000, 0x20808000, 0x20000020,
	  0x20800000, 0x20008020, 0x00000020, 0x00808000 },

	/* nibble 3 */
	{ 0x00080201, 0x02000200, 0x00000001, 0x02080201,
	  0x00000000, 0x02080000, 0x02000201, 0x00080001,
	  0x02080200, 0x02000001, 0x02000000, 0x00000201,
	  0x02000001, 0x00080201, 0x00080000, 0x02000000,
	  0x02080001, 0x00080200, 0x00000200, 0x00000001,
	  0x00080200, 0x02000201, 0x02080000, 0x00000200,
	  0x00000201, 0x00000000, 0x00080001, 0x02080200,
	  0x02000200, 0x02080001, 0x02080201, 0x00080000,
	  0x02080001, 0x00000201, 0x00080000, 0x02000001,
	  0x00080200, 0x02000200, 0x00000001, 0x02080000,
	  0x02000201, 0x00000000, 0x00000200, 0x00080001,
	  0x00000000, 0x02080001, 0x02080200, 0x00000200,
	  0x02000000, 0x02080201, 0x00080201, 0x00080000,
	  0x02080201, 0x00000001, 0x02000200, 0x00080201,
	  0x00080001, 0x00080200, 0x02080000, 0x02000201,
	  0x00000201, 0x02000000, 0x02000001, 0x02080200 },

	/* nibble 4 */
	{ 0x01000000, 0x00002000, 0x00000080, 0x01002084,
	  0x01002004, 0x01000080, 0x00002084, 0x01002000,
	  0x00002000, 0x00000004, 0x01000004, 0x00002080,
	  0x01000084, 0x01002004, 0x01002080, 0x00000000,
	  0x00002080, 0x01000000, 0x00002004, 0x00000084,
	  0x01000080, 0x00002084, 0x00000000, 0x01000004,
	  0x00000004, 0x01000084, 0x01002084, 0x00002004,
	  0x01002000, 0x00000080, 0x00000084, 0x01002080,
	  0x01002080, 0x01000084, 0x00002004, 0x01002000,
	  0x00002000, 0x00000004, 0x01000004, 0x01000080,
	  0x01000000, 0x00002080, 0x01002084, 0x00000000,
	  0x00002084, 0x01000000, 0x00000080, 0x00002004,
	  0x01000084, 0x00000080, 0x00000000, 0x01002084,
	  0x01002004, 0x01002080, 0x00000084, 0x00002000,
	  0x00002080, 0x01002004, 0x01000080, 0x00000084,
	  0x00000004, 0x00002084, 0x01002000, 0x01000004 },

	/* nibble 5 */
	{ 0x10000008, 0x00040008, 0x00000000, 0x10040400,
	  0x00040008, 0x00000400, 0x10000408, 0x00040000,
	  0x00000408, 0x10040408, 0x00040400, 0x10000000,
	  0x10000400, 0x10000008, 0x10040000, 0x00040408,
	  0x00040000, 0x10000408, 0x10040008, 0x00000000,
	  0x00000400, 0x00000008, 0x10040400, 0x10040008,
	  0x10040408, 0x10040000, 0x10000000, 0x00000408,
	  0x00000008, 0x00040400, 0x00040408, 0x10000400,
	  0x00000408, 0x10000000, 0x10000400, 0x00040408,
	  0x10040400, 0x00040008, 0x00000000, 0x10000400,
	  0x10000000, 0x00000400, 0x10040008, 0x00040000,
	  0x00040008, 0x10040408, 0x00040400, 0x00000008,
	  0x10040408, 0x00040400, 0x00040000, 0x10000408,
	  0x10000008, 0x10040000, 0x00040408, 0x00000000,
	  0x00000400, 0x10000008, 0x10000408, 0x10040400,
	  0x10040000, 0x00000408, 0x00000008, 0x10040008 },

	/* nibble 6 */
	{ 0x00000800, 0x00000040, 0x00200040, 0x80200000,
	  0x80200840, 0x80000800, 0x00000840, 0x00000000,
	  0x00200000, 0x80200040, 0x80000040, 0x00200800,
	  0x80000000, 0x00200840, 0x00200800, 0x80000040,
	  0x80200040, 0x00000800, 0x80000800, 0x80200840,
	  0x00000000, 0x00200040, 0x80200000, 0x00000840,
	  0x80200800, 0x80000840, 0x00200840, 0x80000000,
	  0x80000840, 0x80200800, 0x00000040, 0x00200000,
	  0x80000840, 0x00200800, 0x80200800, 0x80000040,
	  0x00000800, 0x00000040, 0x00200000, 0x80200800,
	  0x80200040, 0x80000840, 0x00000840, 0x00000000,
	  0x00000040, 0x80200000, 0x80000000, 0x00200040,
	  0x00000000, 0x80200040, 0x00200040, 0x00000840,
	  0x80000040, 0x00000800, 0x80200840, 0x00200000,
	  0x00200840, 0x80000000, 0x80000800, 0x80200840,
	  0x80200000, 0x00200840, 0x00200800, 0x80000800 },

	/* nibble 7 */
	{ 0x04100010, 0x04104000, 0x00004010, 0x00000000,
	  0x04004000, 0x00100010, 0x04100000, 0x04104010,
	  0x00000010, 0x04000000, 0x00104000, 0x00004010,
	  0x00104010, 0x04004010, 0x04000010, 0x04100000,
	  0x00004000, 0x00104010, 0x00100010, 0x04004000,
	  0x04104010, 0x04000010, 0x00000000, 0x00104000,
	  0x04000000, 0x00100000, 0x04004010, 0x04100010,
	  0x00100000, 0x00004000, 0x04104000, 0x00000010,
	  0x00100000, 0x00004000, 0x04000010, 0x04104010,
	  0x00004010, 0x04000000, 0x00000000, 0x00104000,
	  0x04100010, 0x04004010, 0x04004000, 0x00100010,
	  0x04104000, 0x00000010, 0x00100010, 0x04004000,
	  0x04104010, 0x00100000, 0x04100000, 0x04000010,
	  0x00104000, 0x00004010, 0x04004010, 0x04100000,
	  0x00000010, 0x04104000, 0x00104010, 0x00000000,
	  0x04000000, 0x04100010, 0x00004000, 0x00104010}
};

#define ITERATIONS 16
#define HALF_ITERATIONS 8

#define c2l(c,l)	(l =((CARD32)(*((c)++)))    , \
			 l|=((CARD32)(*((c)++)))<< 8, \
			 l|=((CARD32)(*((c)++)))<<16, \
			 l|=((CARD32)(*((c)++)))<<24)

#define l2c(l,c)	(*((c)++)=(CARD8)(((l)    )&0xff), \
			 *((c)++)=(CARD8)(((l)>> 8)&0xff), \
			 *((c)++)=(CARD8)(((l)>>16)&0xff), \
			 *((c)++)=(CARD8)(((l)>>24)&0xff))

#define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\
	(b)^=(t),\
	(a)^=((t)<<(n)))

#define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\
	(a)=(a)^(t)^(t>>(16-(n))))\

static const char shifts2[16] = {0,0,1,1,1,1,1,1,0,1,1,1,1,1,1,0};

void _XdmcpAuthSetup(auth_cblock key, auth_wrapper_schedule schedule)
{
	CARD32 c,d,t,s;
	CARD8 *in;
	CARD32 *k;
	int i;

	k=(CARD32 *)schedule;
	in=(CARD8 *)key;

	c2l(in,c);
	c2l(in,d);

	/* do PC1 in 60 simple operations */
	PERM_OP(d,c,t,4,0x0f0f0f0f);
	HPERM_OP(c,t,-2, 0xcccc0000);
	HPERM_OP(c,t,-1, 0xaaaa0000);
	HPERM_OP(c,t, 8, 0x00ff0000);
	HPERM_OP(c,t,-1, 0xaaaa0000);
	HPERM_OP(d,t,-8, 0xff000000);
	HPERM_OP(d,t, 8, 0x00ff0000);
	HPERM_OP(d,t, 2, 0x33330000);
	d=((d&0x00aa00aa)<<7)|((d&0x55005500)>>7)|(d&0xaa55aa55);
	d=(d>>8)|((c&0xf0000000)>>4);
	c&=0x0fffffff;

	for (i=0; i<ITERATIONS; i++) {
		if (shifts2[i]) {
			c=((c>>2)|(c<<26)); d=((d>>2)|(d<<26));
		} else {
			c=((c>>1)|(c<<27)); d=((d>>1)|(d<<27));
		}
		c&=0x0fffffff;
		d&=0x0fffffff;
		/* could be a few less shifts but I am to lazy at this
		 * point in time to investigate */
		s=	skb[0][ (c    )&0x3f		    ]|
			skb[1][((c>> 6)&0x03)|((c>> 7)&0x3c)]|
			skb[2][((c>>13)&0x0f)|((c>>14)&0x30)]|
			skb[3][((c>>20)&0x01)|((c>>21)&0x06) |
					      ((c>>22)&0x38)];
		t=	skb[4][ (d    )&0x3f		    ]|
			skb[5][((d>> 7)&0x03)|((d>> 8)&0x3c)]|
			skb[6][ (d>>15)&0x3f		    ]|
			skb[7][((d>>21)&0x0f)|((d>>22)&0x30)];

		/* table contained 0213 4657 */
		*(k++)=((t<<16)|(s&0x0000ffff));
		s=     ((s>>16)|(t&0xffff0000));

		s=(s<<4)|(s>>28);
		*(k++)=s;
	}
	return;
}

#define D_ENCRYPT(L,R,S)	\
	t=(R<<1)|(R>>31); \
	u=(t^s[S  ]); \
	t=(t^s[S+1]); \
	t=(t>>4)|(t<<28); \
	L^=	SPtrans[1][(t	 )&0x3f]| \
		SPtrans[3][(t>> 8)&0x3f]| \
		SPtrans[5][(t>>16)&0x3f]| \
		SPtrans[7][(t>>24)&0x3f]| \
		SPtrans[0][(u	 )&0x3f]| \
		SPtrans[2][(u>> 8)&0x3f]| \
		SPtrans[4][(u>>16)&0x3f]| \
		SPtrans[6][(u>>24)&0x3f];


void _XdmcpAuthDoIt(auth_cblock input, auth_cblock output,
    auth_wrapper_schedule ks, int encrypt)
{
	CARD32 l,r,t,u;
	CARD32 *s;
	CARD8 *in,*out;
	int i;

	in=(CARD8 *)input;
	out=(CARD8 *)output;
	c2l(in,l);
	c2l(in,r);

	/* do IP */
	PERM_OP(r,l,t, 4,0x0f0f0f0f);
	PERM_OP(l,r,t,16,0x0000ffff);
	PERM_OP(r,l,t, 2,0x33333333);
	PERM_OP(l,r,t, 8,0x00ff00ff);
	PERM_OP(r,l,t, 1,0x55555555);
	/* r and l are reversed - remember that :-) */
	t=l;
	l=r;
	r=t;

	s=(CARD32 *)ks;

	if (encrypt) {
		for (i=0; i<(ITERATIONS*2); i+=4) {
			D_ENCRYPT(l,r,	i); /*	1 */
			D_ENCRYPT(r,l,	i+2); /*  2 */
		}
	} else {
		for (i=(ITERATIONS*2)-2; i >= 0; i-=4) {
			D_ENCRYPT(l,r,	i); /*	1 */
			D_ENCRYPT(r,l,	i-2); /*  2 */
		}
	}

	/* swap l and r
	 * we will not do the swap so just remember they are
	 * reversed for the rest of the subroutine
	 * luckily by FP fixes this problem :-) */

	PERM_OP(r,l,t, 1,0x55555555);
	PERM_OP(l,r,t, 8,0x00ff00ff);
	PERM_OP(r,l,t, 2,0x33333333);
	PERM_OP(l,r,t,16,0x0000ffff);
	PERM_OP(r,l,t, 4,0x0f0f0f0f);

	l2c(l,out);
	l2c(r,out);
	return;
}