/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.] */

#include <openssl/des.h>

#include "internal.h"


static const uint32_t des_skb[8][64] = {
    {/* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
     0x00000000L, 0x00000010L, 0x20000000L, 0x20000010L, 0x00010000L,
     0x00010010L, 0x20010000L, 0x20010010L, 0x00000800L, 0x00000810L,
     0x20000800L, 0x20000810L, 0x00010800L, 0x00010810L, 0x20010800L,
     0x20010810L, 0x00000020L, 0x00000030L, 0x20000020L, 0x20000030L,
     0x00010020L, 0x00010030L, 0x20010020L, 0x20010030L, 0x00000820L,
     0x00000830L, 0x20000820L, 0x20000830L, 0x00010820L, 0x00010830L,
     0x20010820L, 0x20010830L, 0x00080000L, 0x00080010L, 0x20080000L,
     0x20080010L, 0x00090000L, 0x00090010L, 0x20090000L, 0x20090010L,
     0x00080800L, 0x00080810L, 0x20080800L, 0x20080810L, 0x00090800L,
     0x00090810L, 0x20090800L, 0x20090810L, 0x00080020L, 0x00080030L,
     0x20080020L, 0x20080030L, 0x00090020L, 0x00090030L, 0x20090020L,
     0x20090030L, 0x00080820L, 0x00080830L, 0x20080820L, 0x20080830L,
     0x00090820L, 0x00090830L, 0x20090820L, 0x20090830L, },
    {/* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */
     0x00000000L, 0x02000000L, 0x00002000L, 0x02002000L, 0x00200000L,
     0x02200000L, 0x00202000L, 0x02202000L, 0x00000004L, 0x02000004L,
     0x00002004L, 0x02002004L, 0x00200004L, 0x02200004L, 0x00202004L,
     0x02202004L, 0x00000400L, 0x02000400L, 0x00002400L, 0x02002400L,
     0x00200400L, 0x02200400L, 0x00202400L, 0x02202400L, 0x00000404L,
     0x02000404L, 0x00002404L, 0x02002404L, 0x00200404L, 0x02200404L,
     0x00202404L, 0x02202404L, 0x10000000L, 0x12000000L, 0x10002000L,
     0x12002000L, 0x10200000L, 0x12200000L, 0x10202000L, 0x12202000L,
     0x10000004L, 0x12000004L, 0x10002004L, 0x12002004L, 0x10200004L,
     0x12200004L, 0x10202004L, 0x12202004L, 0x10000400L, 0x12000400L,
     0x10002400L, 0x12002400L, 0x10200400L, 0x12200400L, 0x10202400L,
     0x12202400L, 0x10000404L, 0x12000404L, 0x10002404L, 0x12002404L,
     0x10200404L, 0x12200404L, 0x10202404L, 0x12202404L, },
    {/* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */
     0x00000000L, 0x00000001L, 0x00040000L, 0x00040001L, 0x01000000L,
     0x01000001L, 0x01040000L, 0x01040001L, 0x00000002L, 0x00000003L,
     0x00040002L, 0x00040003L, 0x01000002L, 0x01000003L, 0x01040002L,
     0x01040003L, 0x00000200L, 0x00000201L, 0x00040200L, 0x00040201L,
     0x01000200L, 0x01000201L, 0x01040200L, 0x01040201L, 0x00000202L,
     0x00000203L, 0x00040202L, 0x00040203L, 0x01000202L, 0x01000203L,
     0x01040202L, 0x01040203L, 0x08000000L, 0x08000001L, 0x08040000L,
     0x08040001L, 0x09000000L, 0x09000001L, 0x09040000L, 0x09040001L,
     0x08000002L, 0x08000003L, 0x08040002L, 0x08040003L, 0x09000002L,
     0x09000003L, 0x09040002L, 0x09040003L, 0x08000200L, 0x08000201L,
     0x08040200L, 0x08040201L, 0x09000200L, 0x09000201L, 0x09040200L,
     0x09040201L, 0x08000202L, 0x08000203L, 0x08040202L, 0x08040203L,
     0x09000202L, 0x09000203L, 0x09040202L, 0x09040203L, },
    {/* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */
     0x00000000L, 0x00100000L, 0x00000100L, 0x00100100L, 0x00000008L,
     0x00100008L, 0x00000108L, 0x00100108L, 0x00001000L, 0x00101000L,
     0x00001100L, 0x00101100L, 0x00001008L, 0x00101008L, 0x00001108L,
     0x00101108L, 0x04000000L, 0x04100000L, 0x04000100L, 0x04100100L,
     0x04000008L, 0x04100008L, 0x04000108L, 0x04100108L, 0x04001000L,
     0x04101000L, 0x04001100L, 0x04101100L, 0x04001008L, 0x04101008L,
     0x04001108L, 0x04101108L, 0x00020000L, 0x00120000L, 0x00020100L,
     0x00120100L, 0x00020008L, 0x00120008L, 0x00020108L, 0x00120108L,
     0x00021000L, 0x00121000L, 0x00021100L, 0x00121100L, 0x00021008L,
     0x00121008L, 0x00021108L, 0x00121108L, 0x04020000L, 0x04120000L,
     0x04020100L, 0x04120100L, 0x04020008L, 0x04120008L, 0x04020108L,
     0x04120108L, 0x04021000L, 0x04121000L, 0x04021100L, 0x04121100L,
     0x04021008L, 0x04121008L, 0x04021108L, 0x04121108L, },
    {/* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */
     0x00000000L, 0x10000000L, 0x00010000L, 0x10010000L, 0x00000004L,
     0x10000004L, 0x00010004L, 0x10010004L, 0x20000000L, 0x30000000L,
     0x20010000L, 0x30010000L, 0x20000004L, 0x30000004L, 0x20010004L,
     0x30010004L, 0x00100000L, 0x10100000L, 0x00110000L, 0x10110000L,
     0x00100004L, 0x10100004L, 0x00110004L, 0x10110004L, 0x20100000L,
     0x30100000L, 0x20110000L, 0x30110000L, 0x20100004L, 0x30100004L,
     0x20110004L, 0x30110004L, 0x00001000L, 0x10001000L, 0x00011000L,
     0x10011000L, 0x00001004L, 0x10001004L, 0x00011004L, 0x10011004L,
     0x20001000L, 0x30001000L, 0x20011000L, 0x30011000L, 0x20001004L,
     0x30001004L, 0x20011004L, 0x30011004L, 0x00101000L, 0x10101000L,
     0x00111000L, 0x10111000L, 0x00101004L, 0x10101004L, 0x00111004L,
     0x10111004L, 0x20101000L, 0x30101000L, 0x20111000L, 0x30111000L,
     0x20101004L, 0x30101004L, 0x20111004L, 0x30111004L, },
    {/* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */
     0x00000000L, 0x08000000L, 0x00000008L, 0x08000008L, 0x00000400L,
     0x08000400L, 0x00000408L, 0x08000408L, 0x00020000L, 0x08020000L,
     0x00020008L, 0x08020008L, 0x00020400L, 0x08020400L, 0x00020408L,
     0x08020408L, 0x00000001L, 0x08000001L, 0x00000009L, 0x08000009L,
     0x00000401L, 0x08000401L, 0x00000409L, 0x08000409L, 0x00020001L,
     0x08020001L, 0x00020009L, 0x08020009L, 0x00020401L, 0x08020401L,
     0x00020409L, 0x08020409L, 0x02000000L, 0x0A000000L, 0x02000008L,
     0x0A000008L, 0x02000400L, 0x0A000400L, 0x02000408L, 0x0A000408L,
     0x02020000L, 0x0A020000L, 0x02020008L, 0x0A020008L, 0x02020400L,
     0x0A020400L, 0x02020408L, 0x0A020408L, 0x02000001L, 0x0A000001L,
     0x02000009L, 0x0A000009L, 0x02000401L, 0x0A000401L, 0x02000409L,
     0x0A000409L, 0x02020001L, 0x0A020001L, 0x02020009L, 0x0A020009L,
     0x02020401L, 0x0A020401L, 0x02020409L, 0x0A020409L, },
    {/* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */
     0x00000000L, 0x00000100L, 0x00080000L, 0x00080100L, 0x01000000L,
     0x01000100L, 0x01080000L, 0x01080100L, 0x00000010L, 0x00000110L,
     0x00080010L, 0x00080110L, 0x01000010L, 0x01000110L, 0x01080010L,
     0x01080110L, 0x00200000L, 0x00200100L, 0x00280000L, 0x00280100L,
     0x01200000L, 0x01200100L, 0x01280000L, 0x01280100L, 0x00200010L,
     0x00200110L, 0x00280010L, 0x00280110L, 0x01200010L, 0x01200110L,
     0x01280010L, 0x01280110L, 0x00000200L, 0x00000300L, 0x00080200L,
     0x00080300L, 0x01000200L, 0x01000300L, 0x01080200L, 0x01080300L,
     0x00000210L, 0x00000310L, 0x00080210L, 0x00080310L, 0x01000210L,
     0x01000310L, 0x01080210L, 0x01080310L, 0x00200200L, 0x00200300L,
     0x00280200L, 0x00280300L, 0x01200200L, 0x01200300L, 0x01280200L,
     0x01280300L, 0x00200210L, 0x00200310L, 0x00280210L, 0x00280310L,
     0x01200210L, 0x01200310L, 0x01280210L, 0x01280310L, },
    {/* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */
     0x00000000L, 0x04000000L, 0x00040000L, 0x04040000L, 0x00000002L,
     0x04000002L, 0x00040002L, 0x04040002L, 0x00002000L, 0x04002000L,
     0x00042000L, 0x04042000L, 0x00002002L, 0x04002002L, 0x00042002L,
     0x04042002L, 0x00000020L, 0x04000020L, 0x00040020L, 0x04040020L,
     0x00000022L, 0x04000022L, 0x00040022L, 0x04040022L, 0x00002020L,
     0x04002020L, 0x00042020L, 0x04042020L, 0x00002022L, 0x04002022L,
     0x00042022L, 0x04042022L, 0x00000800L, 0x04000800L, 0x00040800L,
     0x04040800L, 0x00000802L, 0x04000802L, 0x00040802L, 0x04040802L,
     0x00002800L, 0x04002800L, 0x00042800L, 0x04042800L, 0x00002802L,
     0x04002802L, 0x00042802L, 0x04042802L, 0x00000820L, 0x04000820L,
     0x00040820L, 0x04040820L, 0x00000822L, 0x04000822L, 0x00040822L,
     0x04040822L, 0x00002820L, 0x04002820L, 0x00042820L, 0x04042820L,
     0x00002822L, 0x04002822L, 0x00042822L, 0x04042822L, }};

static const uint32_t DES_SPtrans[8][64] = {
    {/* nibble 0 */
     0x02080800L, 0x00080000L, 0x02000002L, 0x02080802L, 0x02000000L,
     0x00080802L, 0x00080002L, 0x02000002L, 0x00080802L, 0x02080800L,
     0x02080000L, 0x00000802L, 0x02000802L, 0x02000000L, 0x00000000L,
     0x00080002L, 0x00080000L, 0x00000002L, 0x02000800L, 0x00080800L,
     0x02080802L, 0x02080000L, 0x00000802L, 0x02000800L, 0x00000002L,
     0x00000800L, 0x00080800L, 0x02080002L, 0x00000800L, 0x02000802L,
     0x02080002L, 0x00000000L, 0x00000000L, 0x02080802L, 0x02000800L,
     0x00080002L, 0x02080800L, 0x00080000L, 0x00000802L, 0x02000800L,
     0x02080002L, 0x00000800L, 0x00080800L, 0x02000002L, 0x00080802L,
     0x00000002L, 0x02000002L, 0x02080000L, 0x02080802L, 0x00080800L,
     0x02080000L, 0x02000802L, 0x02000000L, 0x00000802L, 0x00080002L,
     0x00000000L, 0x00080000L, 0x02000000L, 0x02000802L, 0x02080800L,
     0x00000002L, 0x02080002L, 0x00000800L, 0x00080802L, },
    {/* nibble 1 */
     0x40108010L, 0x00000000L, 0x00108000L, 0x40100000L, 0x40000010L,
     0x00008010L, 0x40008000L, 0x00108000L, 0x00008000L, 0x40100010L,
     0x00000010L, 0x40008000L, 0x00100010L, 0x40108000L, 0x40100000L,
     0x00000010L, 0x00100000L, 0x40008010L, 0x40100010L, 0x00008000L,
     0x00108010L, 0x40000000L, 0x00000000L, 0x00100010L, 0x40008010L,
     0x00108010L, 0x40108000L, 0x40000010L, 0x40000000L, 0x00100000L,
     0x00008010L, 0x40108010L, 0x00100010L, 0x40108000L, 0x40008000L,
     0x00108010L, 0x40108010L, 0x00100010L, 0x40000010L, 0x00000000L,
     0x40000000L, 0x00008010L, 0x00100000L, 0x40100010L, 0x00008000L,
     0x40000000L, 0x00108010L, 0x40008010L, 0x40108000L, 0x00008000L,
     0x00000000L, 0x40000010L, 0x00000010L, 0x40108010L, 0x00108000L,
     0x40100000L, 0x40100010L, 0x00100000L, 0x00008010L, 0x40008000L,
     0x40008010L, 0x00000010L, 0x40100000L, 0x00108000L, },
    {/* nibble 2 */
     0x04000001L, 0x04040100L, 0x00000100L, 0x04000101L, 0x00040001L,
     0x04000000L, 0x04000101L, 0x00040100L, 0x04000100L, 0x00040000L,
     0x04040000L, 0x00000001L, 0x04040101L, 0x00000101L, 0x00000001L,
     0x04040001L, 0x00000000L, 0x00040001L, 0x04040100L, 0x00000100L,
     0x00000101L, 0x04040101L, 0x00040000L, 0x04000001L, 0x04040001L,
     0x04000100L, 0x00040101L, 0x04040000L, 0x00040100L, 0x00000000L,
     0x04000000L, 0x00040101L, 0x04040100L, 0x00000100L, 0x00000001L,
     0x00040000L, 0x00000101L, 0x00040001L, 0x04040000L, 0x04000101L,
     0x00000000L, 0x04040100L, 0x00040100L, 0x04040001L, 0x00040001L,
     0x04000000L, 0x04040101L, 0x00000001L, 0x00040101L, 0x04000001L,
     0x04000000L, 0x04040101L, 0x00040000L, 0x04000100L, 0x04000101L,
     0x00040100L, 0x04000100L, 0x00000000L, 0x04040001L, 0x00000101L,
     0x04000001L, 0x00040101L, 0x00000100L, 0x04040000L, },
    {/* nibble 3 */
     0x00401008L, 0x10001000L, 0x00000008L, 0x10401008L, 0x00000000L,
     0x10400000L, 0x10001008L, 0x00400008L, 0x10401000L, 0x10000008L,
     0x10000000L, 0x00001008L, 0x10000008L, 0x00401008L, 0x00400000L,
     0x10000000L, 0x10400008L, 0x00401000L, 0x00001000L, 0x00000008L,
     0x00401000L, 0x10001008L, 0x10400000L, 0x00001000L, 0x00001008L,
     0x00000000L, 0x00400008L, 0x10401000L, 0x10001000L, 0x10400008L,
     0x10401008L, 0x00400000L, 0x10400008L, 0x00001008L, 0x00400000L,
     0x10000008L, 0x00401000L, 0x10001000L, 0x00000008L, 0x10400000L,
     0x10001008L, 0x00000000L, 0x00001000L, 0x00400008L, 0x00000000L,
     0x10400008L, 0x10401000L, 0x00001000L, 0x10000000L, 0x10401008L,
     0x00401008L, 0x00400000L, 0x10401008L, 0x00000008L, 0x10001000L,
     0x00401008L, 0x00400008L, 0x00401000L, 0x10400000L, 0x10001008L,
     0x00001008L, 0x10000000L, 0x10000008L, 0x10401000L, },
    {/* nibble 4 */
     0x08000000L, 0x00010000L, 0x00000400L, 0x08010420L, 0x08010020L,
     0x08000400L, 0x00010420L, 0x08010000L, 0x00010000L, 0x00000020L,
     0x08000020L, 0x00010400L, 0x08000420L, 0x08010020L, 0x08010400L,
     0x00000000L, 0x00010400L, 0x08000000L, 0x00010020L, 0x00000420L,
     0x08000400L, 0x00010420L, 0x00000000L, 0x08000020L, 0x00000020L,
     0x08000420L, 0x08010420L, 0x00010020L, 0x08010000L, 0x00000400L,
     0x00000420L, 0x08010400L, 0x08010400L, 0x08000420L, 0x00010020L,
     0x08010000L, 0x00010000L, 0x00000020L, 0x08000020L, 0x08000400L,
     0x08000000L, 0x00010400L, 0x08010420L, 0x00000000L, 0x00010420L,
     0x08000000L, 0x00000400L, 0x00010020L, 0x08000420L, 0x00000400L,
     0x00000000L, 0x08010420L, 0x08010020L, 0x08010400L, 0x00000420L,
     0x00010000L, 0x00010400L, 0x08010020L, 0x08000400L, 0x00000420L,
     0x00000020L, 0x00010420L, 0x08010000L, 0x08000020L, },
    {/* nibble 5 */
     0x80000040L, 0x00200040L, 0x00000000L, 0x80202000L, 0x00200040L,
     0x00002000L, 0x80002040L, 0x00200000L, 0x00002040L, 0x80202040L,
     0x00202000L, 0x80000000L, 0x80002000L, 0x80000040L, 0x80200000L,
     0x00202040L, 0x00200000L, 0x80002040L, 0x80200040L, 0x00000000L,
     0x00002000L, 0x00000040L, 0x80202000L, 0x80200040L, 0x80202040L,
     0x80200000L, 0x80000000L, 0x00002040L, 0x00000040L, 0x00202000L,
     0x00202040L, 0x80002000L, 0x00002040L, 0x80000000L, 0x80002000L,
     0x00202040L, 0x80202000L, 0x00200040L, 0x00000000L, 0x80002000L,
     0x80000000L, 0x00002000L, 0x80200040L, 0x00200000L, 0x00200040L,
     0x80202040L, 0x00202000L, 0x00000040L, 0x80202040L, 0x00202000L,
     0x00200000L, 0x80002040L, 0x80000040L, 0x80200000L, 0x00202040L,
     0x00000000L, 0x00002000L, 0x80000040L, 0x80002040L, 0x80202000L,
     0x80200000L, 0x00002040L, 0x00000040L, 0x80200040L, },
    {/* nibble 6 */
     0x00004000L, 0x00000200L, 0x01000200L, 0x01000004L, 0x01004204L,
     0x00004004L, 0x00004200L, 0x00000000L, 0x01000000L, 0x01000204L,
     0x00000204L, 0x01004000L, 0x00000004L, 0x01004200L, 0x01004000L,
     0x00000204L, 0x01000204L, 0x00004000L, 0x00004004L, 0x01004204L,
     0x00000000L, 0x01000200L, 0x01000004L, 0x00004200L, 0x01004004L,
     0x00004204L, 0x01004200L, 0x00000004L, 0x00004204L, 0x01004004L,
     0x00000200L, 0x01000000L, 0x00004204L, 0x01004000L, 0x01004004L,
     0x00000204L, 0x00004000L, 0x00000200L, 0x01000000L, 0x01004004L,
     0x01000204L, 0x00004204L, 0x00004200L, 0x00000000L, 0x00000200L,
     0x01000004L, 0x00000004L, 0x01000200L, 0x00000000L, 0x01000204L,
     0x01000200L, 0x00004200L, 0x00000204L, 0x00004000L, 0x01004204L,
     0x01000000L, 0x01004200L, 0x00000004L, 0x00004004L, 0x01004204L,
     0x01000004L, 0x01004200L, 0x01004000L, 0x00004004L, },
    {/* nibble 7 */
     0x20800080L, 0x20820000L, 0x00020080L, 0x00000000L, 0x20020000L,
     0x00800080L, 0x20800000L, 0x20820080L, 0x00000080L, 0x20000000L,
     0x00820000L, 0x00020080L, 0x00820080L, 0x20020080L, 0x20000080L,
     0x20800000L, 0x00020000L, 0x00820080L, 0x00800080L, 0x20020000L,
     0x20820080L, 0x20000080L, 0x00000000L, 0x00820000L, 0x20000000L,
     0x00800000L, 0x20020080L, 0x20800080L, 0x00800000L, 0x00020000L,
     0x20820000L, 0x00000080L, 0x00800000L, 0x00020000L, 0x20000080L,
     0x20820080L, 0x00020080L, 0x20000000L, 0x00000000L, 0x00820000L,
     0x20800080L, 0x20020080L, 0x20020000L, 0x00800080L, 0x20820000L,
     0x00000080L, 0x00800080L, 0x20020000L, 0x20820080L, 0x00800000L,
     0x20800000L, 0x20000080L, 0x00820000L, 0x00020080L, 0x20020080L,
     0x20800000L, 0x00000080L, 0x20820000L, 0x00820080L, 0x00000000L,
     0x20000000L, 0x20800080L, 0x00020000L, 0x00820080L, }};

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

void DES_set_key(const DES_cblock *key, DES_key_schedule *schedule) {
  static const int shifts2[16] = {0, 0, 1, 1, 1, 1, 1, 1,
                                  0, 1, 1, 1, 1, 1, 1, 0};
  uint32_t c, d, t, s, t2;
  const uint8_t *in;
  uint32_t *k;
  int i;

  k = &schedule->ks->deslong[0];
  in = key->bytes;

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

  /* do PC1 in 47 simple operations :-)
   * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
   * for the inspiration. :-) */
  PERM_OP(d, c, t, 4, 0x0f0f0f0fL);
  HPERM_OP(c, t, -2, 0xcccc0000L);
  HPERM_OP(d, t, -2, 0xcccc0000L);
  PERM_OP(d, c, t, 1, 0x55555555L);
  PERM_OP(c, d, t, 8, 0x00ff00ffL);
  PERM_OP(d, c, t, 1, 0x55555555L);
  d = (((d & 0x000000ffL) << 16L) | (d & 0x0000ff00L) |
       ((d & 0x00ff0000L) >> 16L) | ((c & 0xf0000000L) >> 4L));
  c &= 0x0fffffffL;

  for (i = 0; i < ITERATIONS; i++) {
    if (shifts2[i]) {
      c = ((c >> 2L) | (c << 26L));
      d = ((d >> 2L) | (d << 26L));
    } else {
      c = ((c >> 1L) | (c << 27L));
      d = ((d >> 1L) | (d << 27L));
    }
    c &= 0x0fffffffL;
    d &= 0x0fffffffL;
    /* could be a few less shifts but I am to lazy at this
     * point in time to investigate */
    s = des_skb[0][(c) & 0x3f] |
        des_skb[1][((c >> 6L) & 0x03) | ((c >> 7L) & 0x3c)] |
        des_skb[2][((c >> 13L) & 0x0f) | ((c >> 14L) & 0x30)] |
        des_skb[3][((c >> 20L) & 0x01) | ((c >> 21L) & 0x06) |
                   ((c >> 22L) & 0x38)];
    t = des_skb[4][(d) & 0x3f] |
        des_skb[5][((d >> 7L) & 0x03) | ((d >> 8L) & 0x3c)] |
        des_skb[6][(d >> 15L) & 0x3f] |
        des_skb[7][((d >> 21L) & 0x0f) | ((d >> 22L) & 0x30)];

    /* table contained 0213 4657 */
    t2 = ((t << 16L) | (s & 0x0000ffffL)) & 0xffffffffL;
    *(k++) = ROTATE(t2, 30) & 0xffffffffL;

    t2 = ((s >> 16L) | (t & 0xffff0000L));
    *(k++) = ROTATE(t2, 26) & 0xffffffffL;
  }
}

static void DES_encrypt1(uint32_t *data, const DES_key_schedule *ks, int enc) {
  uint32_t l, r, t, u;
  const uint32_t *s;

  r = data[0];
  l = data[1];

  IP(r, l);
  /* Things have been modified so that the initial rotate is done outside
   * the loop.  This required the DES_SPtrans values in sp.h to be
   * rotated 1 bit to the right. One perl script later and things have a
   * 5% speed up on a sparc2. Thanks to Richard Outerbridge
   * <71755.204@CompuServe.COM> for pointing this out. */
  /* clear the top bits on machines with 8byte longs */
  /* shift left by 2 */
  r = ROTATE(r, 29) & 0xffffffffL;
  l = ROTATE(l, 29) & 0xffffffffL;

  s = ks->ks->deslong;
  /* I don't know if it is worth the effort of loop unrolling the
   * inner loop */
  if (enc) {
    D_ENCRYPT(l, r, 0);  /*  1 */
    D_ENCRYPT(r, l, 2);  /*  2 */
    D_ENCRYPT(l, r, 4);  /*  3 */
    D_ENCRYPT(r, l, 6);  /*  4 */
    D_ENCRYPT(l, r, 8);  /*  5 */
    D_ENCRYPT(r, l, 10); /*  6 */
    D_ENCRYPT(l, r, 12); /*  7 */
    D_ENCRYPT(r, l, 14); /*  8 */
    D_ENCRYPT(l, r, 16); /*  9 */
    D_ENCRYPT(r, l, 18); /*  10 */
    D_ENCRYPT(l, r, 20); /*  11 */
    D_ENCRYPT(r, l, 22); /*  12 */
    D_ENCRYPT(l, r, 24); /*  13 */
    D_ENCRYPT(r, l, 26); /*  14 */
    D_ENCRYPT(l, r, 28); /*  15 */
    D_ENCRYPT(r, l, 30); /*  16 */
  } else {
    D_ENCRYPT(l, r, 30); /* 16 */
    D_ENCRYPT(r, l, 28); /* 15 */
    D_ENCRYPT(l, r, 26); /* 14 */
    D_ENCRYPT(r, l, 24); /* 13 */
    D_ENCRYPT(l, r, 22); /* 12 */
    D_ENCRYPT(r, l, 20); /* 11 */
    D_ENCRYPT(l, r, 18); /* 10 */
    D_ENCRYPT(r, l, 16); /*  9 */
    D_ENCRYPT(l, r, 14); /*  8 */
    D_ENCRYPT(r, l, 12); /*  7 */
    D_ENCRYPT(l, r, 10); /*  6 */
    D_ENCRYPT(r, l, 8);  /*  5 */
    D_ENCRYPT(l, r, 6);  /*  4 */
    D_ENCRYPT(r, l, 4);  /*  3 */
    D_ENCRYPT(l, r, 2);  /*  2 */
    D_ENCRYPT(r, l, 0);  /*  1 */
  }

  /* rotate and clear the top bits on machines with 8byte longs */
  l = ROTATE(l, 3) & 0xffffffffL;
  r = ROTATE(r, 3) & 0xffffffffL;

  FP(r, l);
  data[0] = l;
  data[1] = r;
  l = r = t = u = 0;
}

static void DES_encrypt2(uint32_t *data, const DES_key_schedule *ks, int enc) {
  uint32_t l, r, t, u;
  const uint32_t *s;

  r = data[0];
  l = data[1];

  /* Things have been modified so that the initial rotate is done outside the
   * loop.  This required the DES_SPtrans values in sp.h to be rotated 1 bit to
   * the right. One perl script later and things have a 5% speed up on a
   * sparc2. Thanks to Richard Outerbridge <71755.204@CompuServe.COM> for
   * pointing this out. */
  /* clear the top bits on machines with 8byte longs */
  r = ROTATE(r, 29) & 0xffffffffL;
  l = ROTATE(l, 29) & 0xffffffffL;

  s = ks->ks->deslong;
  /* I don't know if it is worth the effort of loop unrolling the
   * inner loop */
  if (enc) {
    D_ENCRYPT(l, r, 0);  /*  1 */
    D_ENCRYPT(r, l, 2);  /*  2 */
    D_ENCRYPT(l, r, 4);  /*  3 */
    D_ENCRYPT(r, l, 6);  /*  4 */
    D_ENCRYPT(l, r, 8);  /*  5 */
    D_ENCRYPT(r, l, 10); /*  6 */
    D_ENCRYPT(l, r, 12); /*  7 */
    D_ENCRYPT(r, l, 14); /*  8 */
    D_ENCRYPT(l, r, 16); /*  9 */
    D_ENCRYPT(r, l, 18); /*  10 */
    D_ENCRYPT(l, r, 20); /*  11 */
    D_ENCRYPT(r, l, 22); /*  12 */
    D_ENCRYPT(l, r, 24); /*  13 */
    D_ENCRYPT(r, l, 26); /*  14 */
    D_ENCRYPT(l, r, 28); /*  15 */
    D_ENCRYPT(r, l, 30); /*  16 */
  } else {
    D_ENCRYPT(l, r, 30); /* 16 */
    D_ENCRYPT(r, l, 28); /* 15 */
    D_ENCRYPT(l, r, 26); /* 14 */
    D_ENCRYPT(r, l, 24); /* 13 */
    D_ENCRYPT(l, r, 22); /* 12 */
    D_ENCRYPT(r, l, 20); /* 11 */
    D_ENCRYPT(l, r, 18); /* 10 */
    D_ENCRYPT(r, l, 16); /*  9 */
    D_ENCRYPT(l, r, 14); /*  8 */
    D_ENCRYPT(r, l, 12); /*  7 */
    D_ENCRYPT(l, r, 10); /*  6 */
    D_ENCRYPT(r, l, 8);  /*  5 */
    D_ENCRYPT(l, r, 6);  /*  4 */
    D_ENCRYPT(r, l, 4);  /*  3 */
    D_ENCRYPT(l, r, 2);  /*  2 */
    D_ENCRYPT(r, l, 0);  /*  1 */
  }
  /* rotate and clear the top bits on machines with 8byte longs */
  data[0] = ROTATE(l, 3) & 0xffffffffL;
  data[1] = ROTATE(r, 3) & 0xffffffffL;
  l = r = t = u = 0;
}

static void DES_encrypt3(uint32_t *data, const DES_key_schedule *ks1,
                         const DES_key_schedule *ks2,
                         const DES_key_schedule *ks3) {
  uint32_t l, r;

  l = data[0];
  r = data[1];
  IP(l, r);
  data[0] = l;
  data[1] = r;
  DES_encrypt2((uint32_t *)data, ks1, DES_ENCRYPT);
  DES_encrypt2((uint32_t *)data, ks2, DES_DECRYPT);
  DES_encrypt2((uint32_t *)data, ks3, DES_ENCRYPT);
  l = data[0];
  r = data[1];
  FP(r, l);
  data[0] = l;
  data[1] = r;
}

static void DES_decrypt3(uint32_t *data, const DES_key_schedule *ks1,
                         const DES_key_schedule *ks2,
                         const DES_key_schedule *ks3) {
  uint32_t l, r;

  l = data[0];
  r = data[1];
  IP(l, r);
  data[0] = l;
  data[1] = r;
  DES_encrypt2((uint32_t *)data, ks3, DES_DECRYPT);
  DES_encrypt2((uint32_t *)data, ks2, DES_ENCRYPT);
  DES_encrypt2((uint32_t *)data, ks1, DES_DECRYPT);
  l = data[0];
  r = data[1];
  FP(r, l);
  data[0] = l;
  data[1] = r;
}

void DES_ecb_encrypt(const DES_cblock *in_block, DES_cblock *out_block,
                     const DES_key_schedule *schedule, int is_encrypt) {
  uint32_t l;
  uint32_t ll[2];
  const uint8_t *in = in_block->bytes;
  uint8_t *out = out_block->bytes;

  c2l(in, l);
  ll[0] = l;
  c2l(in, l);
  ll[1] = l;
  DES_encrypt1(ll, schedule, is_encrypt);
  l = ll[0];
  l2c(l, out);
  l = ll[1];
  l2c(l, out);
  l = ll[0] = ll[1] = 0;
}

void DES_ncbc_encrypt(const uint8_t *in, uint8_t *out, size_t len,
                      const DES_key_schedule *schedule, DES_cblock *ivec,
                      int enc) {
  uint32_t tin0, tin1;
  uint32_t tout0, tout1, xor0, xor1;
  uint32_t tin[2];
  unsigned char *iv;

  iv = ivec->bytes;

  if (enc) {
    c2l(iv, tout0);
    c2l(iv, tout1);
    for (; len >= 8; len -= 8) {
      c2l(in, tin0);
      c2l(in, tin1);
      tin0 ^= tout0;
      tin[0] = tin0;
      tin1 ^= tout1;
      tin[1] = tin1;
      DES_encrypt1((uint32_t *)tin, schedule, DES_ENCRYPT);
      tout0 = tin[0];
      l2c(tout0, out);
      tout1 = tin[1];
      l2c(tout1, out);
    }
    if (len != 0) {
      c2ln(in, tin0, tin1, len);
      tin0 ^= tout0;
      tin[0] = tin0;
      tin1 ^= tout1;
      tin[1] = tin1;
      DES_encrypt1((uint32_t *)tin, schedule, DES_ENCRYPT);
      tout0 = tin[0];
      l2c(tout0, out);
      tout1 = tin[1];
      l2c(tout1, out);
    }
    iv = ivec->bytes;
    l2c(tout0, iv);
    l2c(tout1, iv);
  } else {
    c2l(iv, xor0);
    c2l(iv, xor1);
    for (; len >= 8; len -= 8) {
      c2l(in, tin0);
      tin[0] = tin0;
      c2l(in, tin1);
      tin[1] = tin1;
      DES_encrypt1((uint32_t *)tin, schedule, DES_DECRYPT);
      tout0 = tin[0] ^ xor0;
      tout1 = tin[1] ^ xor1;
      l2c(tout0, out);
      l2c(tout1, out);
      xor0 = tin0;
      xor1 = tin1;
    }
    if (len != 0) {
      c2l(in, tin0);
      tin[0] = tin0;
      c2l(in, tin1);
      tin[1] = tin1;
      DES_encrypt1((uint32_t *)tin, schedule, DES_DECRYPT);
      tout0 = tin[0] ^ xor0;
      tout1 = tin[1] ^ xor1;
      l2cn(tout0, tout1, out, len);
      xor0 = tin0;
      xor1 = tin1;
    }
    iv = ivec->bytes;
    l2c(xor0, iv);
    l2c(xor1, iv);
  }
  tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
  tin[0] = tin[1] = 0;
}

void DES_ede3_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t len,
                          const DES_key_schedule *ks1,
                          const DES_key_schedule *ks2,
                          const DES_key_schedule *ks3, DES_cblock *ivec,
                          int enc) {
  uint32_t tin0, tin1;
  uint32_t tout0, tout1, xor0, xor1;
  uint32_t tin[2];
  uint8_t *iv;

  iv = ivec->bytes;

  if (enc) {
    c2l(iv, tout0);
    c2l(iv, tout1);
    for (; len >= 8; len -= 8) {
      c2l(in, tin0);
      c2l(in, tin1);
      tin0 ^= tout0;
      tin1 ^= tout1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_encrypt3((uint32_t *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      l2c(tout0, out);
      l2c(tout1, out);
    }
    if (len != 0) {
      c2ln(in, tin0, tin1, len);
      tin0 ^= tout0;
      tin1 ^= tout1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_encrypt3((uint32_t *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      l2c(tout0, out);
      l2c(tout1, out);
    }
    iv = ivec->bytes;
    l2c(tout0, iv);
    l2c(tout1, iv);
  } else {
    uint32_t t0, t1;

    c2l(iv, xor0);
    c2l(iv, xor1);
    for (; len >= 8; len -= 8) {
      c2l(in, tin0);
      c2l(in, tin1);

      t0 = tin0;
      t1 = tin1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_decrypt3((uint32_t *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      tout0 ^= xor0;
      tout1 ^= xor1;
      l2c(tout0, out);
      l2c(tout1, out);
      xor0 = t0;
      xor1 = t1;
    }
    if (len != 0) {
      c2l(in, tin0);
      c2l(in, tin1);

      t0 = tin0;
      t1 = tin1;

      tin[0] = tin0;
      tin[1] = tin1;
      DES_decrypt3((uint32_t *)tin, ks1, ks2, ks3);
      tout0 = tin[0];
      tout1 = tin[1];

      tout0 ^= xor0;
      tout1 ^= xor1;
      l2cn(tout0, tout1, out, len);
      xor0 = t0;
      xor1 = t1;
    }

    iv = ivec->bytes;
    l2c(xor0, iv);
    l2c(xor1, iv);
  }

  tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
  tin[0] = tin[1] = 0;
}