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package gnu.crypto.cipher;
// ----------------------------------------------------------------------------
// $Id: DES.java,v 1.3 2003/10/05 03:41:38 raif Exp $
//
// Copyright (C) 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option)
// any later version.
//
// GNU Crypto is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 59 Temple Place - Suite 330,
// Boston, MA 02111-1307
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
//
// --------------------------------------------------------------------------
import gnu.crypto.Registry;
import gnu.crypto.Properties;
import gnu.crypto.util.Util;
import java.security.InvalidKeyException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
/**
* The Data Encryption Standard. DES is a 64-bit block cipher with a 56-bit
* key, developed by IBM in the 1970's for the standardization process begun by
* the National Bureau of Standards (now NIST).
*
* New applications should not use DES except for compatibility.
*
* This version is based upon the description and sample implementation in
* [1].
*
* References:
*
* - Bruce Schneier, Applied Cryptography: Protocols, Algorithms, and
* Source Code in C, Second Edition. (1996 John Wiley and Sons) ISBN
* 0-471-11709-9. Pages 265--301, 623--632.
*
*
* @version $Revision: 1.3 $
*/
public class DES extends BaseCipher {
// Constants and variables
// -------------------------------------------------------------------------
/** DES operates on 64 bit blocks. */
public static final int BLOCK_SIZE = 8;
/** DES uses 56 bits of a 64 bit parity-adjusted key. */
public static final int KEY_SIZE = 8;
// S-Boxes 1 through 8.
private static final int[] SP1 = new int[] {
0x01010400, 0x00000000, 0x00010000, 0x01010404,
0x01010004, 0x00010404, 0x00000004, 0x00010000,
0x00000400, 0x01010400, 0x01010404, 0x00000400,
0x01000404, 0x01010004, 0x01000000, 0x00000004,
0x00000404, 0x01000400, 0x01000400, 0x00010400,
0x00010400, 0x01010000, 0x01010000, 0x01000404,
0x00010004, 0x01000004, 0x01000004, 0x00010004,
0x00000000, 0x00000404, 0x00010404, 0x01000000,
0x00010000, 0x01010404, 0x00000004, 0x01010000,
0x01010400, 0x01000000, 0x01000000, 0x00000400,
0x01010004, 0x00010000, 0x00010400, 0x01000004,
0x00000400, 0x00000004, 0x01000404, 0x00010404,
0x01010404, 0x00010004, 0x01010000, 0x01000404,
0x01000004, 0x00000404, 0x00010404, 0x01010400,
0x00000404, 0x01000400, 0x01000400, 0x00000000,
0x00010004, 0x00010400, 0x00000000, 0x01010004
};
private static final int[] SP2 = new int[] {
0x80108020, 0x80008000, 0x00008000, 0x00108020,
0x00100000, 0x00000020, 0x80100020, 0x80008020,
0x80000020, 0x80108020, 0x80108000, 0x80000000,
0x80008000, 0x00100000, 0x00000020, 0x80100020,
0x00108000, 0x00100020, 0x80008020, 0x00000000,
0x80000000, 0x00008000, 0x00108020, 0x80100000,
0x00100020, 0x80000020, 0x00000000, 0x00108000,
0x00008020, 0x80108000, 0x80100000, 0x00008020,
0x00000000, 0x00108020, 0x80100020, 0x00100000,
0x80008020, 0x80100000, 0x80108000, 0x00008000,
0x80100000, 0x80008000, 0x00000020, 0x80108020,
0x00108020, 0x00000020, 0x00008000, 0x80000000,
0x00008020, 0x80108000, 0x00100000, 0x80000020,
0x00100020, 0x80008020, 0x80000020, 0x00100020,
0x00108000, 0x00000000, 0x80008000, 0x00008020,
0x80000000, 0x80100020, 0x80108020, 0x00108000
};
private static final int[] SP3 = new int[] {
0x00000208, 0x08020200, 0x00000000, 0x08020008,
0x08000200, 0x00000000, 0x00020208, 0x08000200,
0x00020008, 0x08000008, 0x08000008, 0x00020000,
0x08020208, 0x00020008, 0x08020000, 0x00000208,
0x08000000, 0x00000008, 0x08020200, 0x00000200,
0x00020200, 0x08020000, 0x08020008, 0x00020208,
0x08000208, 0x00020200, 0x00020000, 0x08000208,
0x00000008, 0x08020208, 0x00000200, 0x08000000,
0x08020200, 0x08000000, 0x00020008, 0x00000208,
0x00020000, 0x08020200, 0x08000200, 0x00000000,
0x00000200, 0x00020008, 0x08020208, 0x08000200,
0x08000008, 0x00000200, 0x00000000, 0x08020008,
0x08000208, 0x00020000, 0x08000000, 0x08020208,
0x00000008, 0x00020208, 0x00020200, 0x08000008,
0x08020000, 0x08000208, 0x00000208, 0x08020000,
0x00020208, 0x00000008, 0x08020008, 0x00020200
};
private static final int[] SP4 = new int[] {
0x00802001, 0x00002081, 0x00002081, 0x00000080,
0x00802080, 0x00800081, 0x00800001, 0x00002001,
0x00000000, 0x00802000, 0x00802000, 0x00802081,
0x00000081, 0x00000000, 0x00800080, 0x00800001,
0x00000001, 0x00002000, 0x00800000, 0x00802001,
0x00000080, 0x00800000, 0x00002001, 0x00002080,
0x00800081, 0x00000001, 0x00002080, 0x00800080,
0x00002000, 0x00802080, 0x00802081, 0x00000081,
0x00800080, 0x00800001, 0x00802000, 0x00802081,
0x00000081, 0x00000000, 0x00000000, 0x00802000,
0x00002080, 0x00800080, 0x00800081, 0x00000001,
0x00802001, 0x00002081, 0x00002081, 0x00000080,
0x00802081, 0x00000081, 0x00000001, 0x00002000,
0x00800001, 0x00002001, 0x00802080, 0x00800081,
0x00002001, 0x00002080, 0x00800000, 0x00802001,
0x00000080, 0x00800000, 0x00002000, 0x00802080
};
private static final int[] SP5 = new int[] {
0x00000100, 0x02080100, 0x02080000, 0x42000100,
0x00080000, 0x00000100, 0x40000000, 0x02080000,
0x40080100, 0x00080000, 0x02000100, 0x40080100,
0x42000100, 0x42080000, 0x00080100, 0x40000000,
0x02000000, 0x40080000, 0x40080000, 0x00000000,
0x40000100, 0x42080100, 0x42080100, 0x02000100,
0x42080000, 0x40000100, 0x00000000, 0x42000000,
0x02080100, 0x02000000, 0x42000000, 0x00080100,
0x00080000, 0x42000100, 0x00000100, 0x02000000,
0x40000000, 0x02080000, 0x42000100, 0x40080100,
0x02000100, 0x40000000, 0x42080000, 0x02080100,
0x40080100, 0x00000100, 0x02000000, 0x42080000,
0x42080100, 0x00080100, 0x42000000, 0x42080100,
0x02080000, 0x00000000, 0x40080000, 0x42000000,
0x00080100, 0x02000100, 0x40000100, 0x00080000,
0x00000000, 0x40080000, 0x02080100, 0x40000100
};
private static final int[] SP6 = new int[] {
0x20000010, 0x20400000, 0x00004000, 0x20404010,
0x20400000, 0x00000010, 0x20404010, 0x00400000,
0x20004000, 0x00404010, 0x00400000, 0x20000010,
0x00400010, 0x20004000, 0x20000000, 0x00004010,
0x00000000, 0x00400010, 0x20004010, 0x00004000,
0x00404000, 0x20004010, 0x00000010, 0x20400010,
0x20400010, 0x00000000, 0x00404010, 0x20404000,
0x00004010, 0x00404000, 0x20404000, 0x20000000,
0x20004000, 0x00000010, 0x20400010, 0x00404000,
0x20404010, 0x00400000, 0x00004010, 0x20000010,
0x00400000, 0x20004000, 0x20000000, 0x00004010,
0x20000010, 0x20404010, 0x00404000, 0x20400000,
0x00404010, 0x20404000, 0x00000000, 0x20400010,
0x00000010, 0x00004000, 0x20400000, 0x00404010,
0x00004000, 0x00400010, 0x20004010, 0x00000000,
0x20404000, 0x20000000, 0x00400010, 0x20004010
};
private static final int[] SP7 = new int[] {
0x00200000, 0x04200002, 0x04000802, 0x00000000,
0x00000800, 0x04000802, 0x00200802, 0x04200800,
0x04200802, 0x00200000, 0x00000000, 0x04000002,
0x00000002, 0x04000000, 0x04200002, 0x00000802,
0x04000800, 0x00200802, 0x00200002, 0x04000800,
0x04000002, 0x04200000, 0x04200800, 0x00200002,
0x04200000, 0x00000800, 0x00000802, 0x04200802,
0x00200800, 0x00000002, 0x04000000, 0x00200800,
0x04000000, 0x00200800, 0x00200000, 0x04000802,
0x04000802, 0x04200002, 0x04200002, 0x00000002,
0x00200002, 0x04000000, 0x04000800, 0x00200000,
0x04200800, 0x00000802, 0x00200802, 0x04200800,
0x00000802, 0x04000002, 0x04200802, 0x04200000,
0x00200800, 0x00000000, 0x00000002, 0x04200802,
0x00000000, 0x00200802, 0x04200000, 0x00000800,
0x04000002, 0x04000800, 0x00000800, 0x00200002
};
private static final int[] SP8 = new int[] {
0x10001040, 0x00001000, 0x00040000, 0x10041040,
0x10000000, 0x10001040, 0x00000040, 0x10000000,
0x00040040, 0x10040000, 0x10041040, 0x00041000,
0x10041000, 0x00041040, 0x00001000, 0x00000040,
0x10040000, 0x10000040, 0x10001000, 0x00001040,
0x00041000, 0x00040040, 0x10040040, 0x10041000,
0x00001040, 0x00000000, 0x00000000, 0x10040040,
0x10000040, 0x10001000, 0x00041040, 0x00040000,
0x00041040, 0x00040000, 0x10041000, 0x00001000,
0x00000040, 0x10040040, 0x00001000, 0x00041040,
0x10001000, 0x00000040, 0x10000040, 0x10040000,
0x10040040, 0x10000000, 0x00040000, 0x10001040,
0x00000000, 0x10041040, 0x00040040, 0x10000040,
0x10040000, 0x10001000, 0x10001040, 0x00000000,
0x10041040, 0x00041000, 0x00041000, 0x00001040,
0x00001040, 0x00040040, 0x10000000, 0x10041000
};
/**
* Constants that help in determining whether or not a byte array is parity
* adjusted.
*/
private static final byte[] PARITY = {
8,1,0,8,0,8,8,0,0,8,8,0,8,0,2,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,3,
0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,
0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,
8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,
0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,
8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,
8,0,0,8,0,8,8,0,0,8,8,0,8,0,0,8,0,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,
4,8,8,0,8,0,0,8,8,0,0,8,0,8,8,0,8,5,0,8,0,8,8,0,0,8,8,0,8,0,6,8
};
// Key schedule constants.
private static final byte[] ROTARS = {
1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28
};
private static final byte[] PC1 = {
56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
};
private static final byte[] PC2 = {
13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
};
/**
* Weak keys (parity adjusted): If all the bits in each half are either 0
* or 1, then the key used for any cycle of the algorithm is the same as
* all other cycles.
*/
public static final byte[][] WEAK_KEYS = {
Util.toBytesFromString("0101010101010101"),
Util.toBytesFromString("01010101FEFEFEFE"),
Util.toBytesFromString("FEFEFEFE01010101"),
Util.toBytesFromString("FEFEFEFEFEFEFEFE")
};
/**
* Semi-weak keys (parity adjusted): Some pairs of keys encrypt plain text
* to identical cipher text. In other words, one key in the pair can decrypt
* messages that were encrypted with the other key. These keys are called
* semi-weak keys. This occurs because instead of 16 different sub-keys being
* generated, these semi-weak keys produce only two different sub-keys.
*/
public static final byte[][] SEMIWEAK_KEYS = {
Util.toBytesFromString("01FE01FE01FE01FE"), Util.toBytesFromString("FE01FE01FE01FE01"),
Util.toBytesFromString("1FE01FE00EF10EF1"), Util.toBytesFromString("E01FE01FF10EF10E"),
Util.toBytesFromString("01E001E001F101F1"), Util.toBytesFromString("E001E001F101F101"),
Util.toBytesFromString("1FFE1FFE0EFE0EFE"), Util.toBytesFromString("FE1FFE1FFE0EFE0E"),
Util.toBytesFromString("011F011F010E010E"), Util.toBytesFromString("1F011F010E010E01"),
Util.toBytesFromString("E0FEE0FEF1FEF1FE"), Util.toBytesFromString("FEE0FEE0FEF1FEF1")
};
/** Possible weak keys (parity adjusted) --produce 4 instead of 16 subkeys. */
public static final byte[][] POSSIBLE_WEAK_KEYS = {
Util.toBytesFromString("1F1F01010E0E0101"),
Util.toBytesFromString("011F1F01010E0E01"),
Util.toBytesFromString("1F01011F0E01010E"),
Util.toBytesFromString("01011F1F01010E0E"),
Util.toBytesFromString("E0E00101F1F10101"),
Util.toBytesFromString("FEFE0101FEFE0101"),
Util.toBytesFromString("FEE01F01FEF10E01"),
Util.toBytesFromString("E0FE1F01F1FE0E01"),
Util.toBytesFromString("FEE0011FFEF1010E"),
Util.toBytesFromString("E0FE011FF1FE010E"),
Util.toBytesFromString("E0E01F1FF1F10E0E"),
Util.toBytesFromString("FEFE1F1FFEFE0E0E"),
Util.toBytesFromString("1F1F01010E0E0101"),
Util.toBytesFromString("011F1F01010E0E01"),
Util.toBytesFromString("1F01011F0E01010E"),
Util.toBytesFromString("01011F1F01010E0E"),
Util.toBytesFromString("01E0E00101F1F101"),
Util.toBytesFromString("1FFEE0010EFEF001"),
Util.toBytesFromString("1FE0FE010EF1FE01"),
Util.toBytesFromString("01FEFE0101FEFE01"),
Util.toBytesFromString("1FE0E01F0EF1F10E"),
Util.toBytesFromString("01FEE01F01FEF10E"),
Util.toBytesFromString("01E0FE1F01F1FE0E"),
Util.toBytesFromString("1FFEFE1F0EFEFE0E"),
Util.toBytesFromString("E00101E0F10101F1"),
Util.toBytesFromString("FE1F01E0FE0E0EF1"),
Util.toBytesFromString("FE011FE0FE010EF1"),
Util.toBytesFromString("E01F1FE0F10E0EF1"),
Util.toBytesFromString("FE0101FEFE0101FE"),
Util.toBytesFromString("E01F01FEF10E01FE"),
Util.toBytesFromString("E0011FFEF1010EFE"),
Util.toBytesFromString("FE1F1FFEFE0E0EFE"),
Util.toBytesFromString("1FFE01E00EFE01F1"),
Util.toBytesFromString("01FE1FE001FE0EF1"),
Util.toBytesFromString("1FE001FE0EF101FE"),
Util.toBytesFromString("01E01FFE01F10EFE"),
Util.toBytesFromString("0101E0E00101F1F1"),
Util.toBytesFromString("1F1FE0E00E0EF1F1"),
Util.toBytesFromString("1F01FEE00E01FEF1"),
Util.toBytesFromString("011FFEE0010EFEF1"),
Util.toBytesFromString("1F01E0FE0E01F1FE"),
Util.toBytesFromString("011FE0FE010EF1FE"),
Util.toBytesFromString("0101FEFE0001FEFE"),
Util.toBytesFromString("1F1FFEFE0E0EFEFE"),
Util.toBytesFromString("FEFEE0E0FEFEF1F1"),
Util.toBytesFromString("E0FEFEE0F1FEFEF1"),
Util.toBytesFromString("FEE0E0FEFEF1F1FE"),
Util.toBytesFromString("E0E0FEFEF1F1FEFE")
};
// Constructor(s)
// -------------------------------------------------------------------------
/** Default 0-argument constructor. */
public DES() {
super(Registry.DES_CIPHER, BLOCK_SIZE, KEY_SIZE);
}
// Class methods
// -------------------------------------------------------------------------
/**
* Adjust the parity for a raw key array. This essentially means that each
* byte in the array will have an odd number of '1' bits (the last bit in
* each byte is unused.
*
* @param kb The key array, to be parity-adjusted.
* @param offset The starting index into the key bytes.
*/
public static void adjustParity(byte[] kb, int offset) {
for (int i = offset; i < KEY_SIZE; i++) {
kb[i] ^= (PARITY[kb[i] & 0xff] == 8) ? 1 : 0;
}
}
/**
* Test if a byte array, which must be at least 8 bytes long, is parity
* adjusted.
*
* @param kb The key bytes.
* @param offset The starting index into the key bytes.
* @return true if the first 8 bytes of kb have been
* parity adjusted. false otherwise.
*/
public static boolean isParityAdjusted(byte[] kb, int offset) {
int w = 0x88888888;
int n = PARITY[kb[offset+0] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+1] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+2] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+3] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+4] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+5] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+6] & 0xff]; n <<= 4;
n |= PARITY[kb[offset+7] & 0xff];
return (n & w) == 0;
}
/**
* Test if a key is a weak key.
*
* @param kb The key to test.
* @return true if the key is weak.
*/
public static boolean isWeak(byte[] kb) {
// return Arrays.equals(kb, WEAK_KEYS[0]) || Arrays.equals(kb, WEAK_KEYS[1])
// || Arrays.equals(kb, WEAK_KEYS[2]) || Arrays.equals(kb, WEAK_KEYS[3])
// || Arrays.equals(kb, WEAK_KEYS[4]) || Arrays.equals(kb, WEAK_KEYS[5])
// || Arrays.equals(kb, WEAK_KEYS[6]) || Arrays.equals(kb, WEAK_KEYS[7]);
for (int i = 0; i < WEAK_KEYS.length; i++) {
if (Arrays.equals(WEAK_KEYS[i], kb)) {
return true;
}
}
return false;
}
/**
* Test if a key is a semi-weak key.
*
* @param kb The key to test.
* @return true if this key is semi-weak.
*/
public static boolean isSemiWeak(byte[] kb) {
// return Arrays.equals(kb, SEMIWEAK_KEYS[0])
// || Arrays.equals(kb, SEMIWEAK_KEYS[1])
// || Arrays.equals(kb, SEMIWEAK_KEYS[2])
// || Arrays.equals(kb, SEMIWEAK_KEYS[3])
// || Arrays.equals(kb, SEMIWEAK_KEYS[4])
// || Arrays.equals(kb, SEMIWEAK_KEYS[5])
// || Arrays.equals(kb, SEMIWEAK_KEYS[6])
// || Arrays.equals(kb, SEMIWEAK_KEYS[7])
// || Arrays.equals(kb, SEMIWEAK_KEYS[8])
// || Arrays.equals(kb, SEMIWEAK_KEYS[9])
// || Arrays.equals(kb, SEMIWEAK_KEYS[10])
// || Arrays.equals(kb, SEMIWEAK_KEYS[11]);
for (int i = 0; i < SEMIWEAK_KEYS.length; i++) {
if (Arrays.equals(SEMIWEAK_KEYS[i], kb)) {
return true;
}
}
return false;
}
/**
* Test if the designated byte array represents a possibly weak key.
*
* @param kb the byte array to test.
* @return true if kbrepresents a possibly weak key.
* Returns false otherwise.
*/
public static boolean isPossibleWeak(byte[] kb) {
for (int i = 0; i < POSSIBLE_WEAK_KEYS.length; i++) {
if (Arrays.equals(POSSIBLE_WEAK_KEYS[i], kb)) {
return true;
}
}
return false;
}
/**
* The core DES function. This is used for both encryption and decryption,
* the only difference being the key.
*
* @param in The input bytes.
* @param i The starting offset into the input bytes.
* @param out The output bytes.
* @param o The starting offset into the output bytes.
* @param key The working key.
*/
private static void desFunc(byte[] in, int i, byte[] out, int o, int[] key) {
int right, left, work;
// Load.
left = (in[i++] & 0xff) << 24 | (in[i++] & 0xff) << 16
| (in[i++] & 0xff) << 8 | in[i++] & 0xff;
right = (in[i++] & 0xff) << 24 | (in[i++] & 0xff) << 16
| (in[i++] & 0xff) << 8 | in[i ] & 0xff;
// Initial permutation.
work = ((left >>> 4) ^ right) & 0x0F0F0F0F;
left ^= work << 4;
right ^= work;
work = ((left >>> 16) ^ right) & 0x0000FFFF;
left ^= work << 16;
right ^= work;
work = ((right >>> 2) ^ left) & 0x33333333;
right ^= work << 2;
left ^= work;
work = ((right >>> 8) ^ left) & 0x00FF00FF;
right ^= work << 8;
left ^= work;
right = ((right << 1) | ((right >>> 31) & 1)) & 0xFFFFFFFF;
work = (left ^ right) & 0xAAAAAAAA;
left ^= work;
right ^= work;
left = ((left << 1) | ((left >>> 31) & 1)) & 0xFFFFFFFF;
int k = 0, t;
for (int round = 0; round < 8; round++) {
work = right >>> 4 | right << 28;
work ^= key[k++];
t = SP7[work & 0x3F]; work >>>= 8;
t |= SP5[work & 0x3F]; work >>>= 8;
t |= SP3[work & 0x3F]; work >>>= 8;
t |= SP1[work & 0x3F];
work = right ^ key[k++];
t |= SP8[work & 0x3F]; work >>>= 8;
t |= SP6[work & 0x3F]; work >>>= 8;
t |= SP4[work & 0x3F]; work >>>= 8;
t |= SP2[work & 0x3F];
left ^= t;
work = left >>> 4 | left << 28;
work ^= key[k++];
t = SP7[work & 0x3F]; work >>>= 8;
t |= SP5[work & 0x3F]; work >>>= 8;
t |= SP3[work & 0x3F]; work >>>= 8;
t |= SP1[work & 0x3F];
work = left ^ key[k++];
t |= SP8[work & 0x3F]; work >>>= 8;
t |= SP6[work & 0x3F]; work >>>= 8;
t |= SP4[work & 0x3F]; work >>>= 8;
t |= SP2[work & 0x3F];
right ^= t;
}
// The final permutation.
right = (right << 31) | (right >>> 1);
work = (left ^ right) & 0xAAAAAAAA;
left ^= work;
right ^= work;
left = (left << 31) | (left >>> 1);
work = ((left >>> 8) ^ right) & 0x00FF00FF;
left ^= work << 8;
right ^= work;
work = ((left >>> 2) ^ right) & 0x33333333;
left ^= work << 2;
right ^= work;
work = ((right >>> 16) ^ left) & 0x0000FFFF;
right ^= work << 16;
left ^= work;
work = ((right >>> 4) ^ left) & 0x0F0F0F0F;
right ^= work << 4;
left ^= work;
out[o++] = (byte)(right >>> 24);
out[o++] = (byte)(right >>> 16);
out[o++] = (byte)(right >>> 8);
out[o++] = (byte) right;
out[o++] = (byte)(left >>> 24);
out[o++] = (byte)(left >>> 16);
out[o++] = (byte)(left >>> 8);
out[o ] = (byte) left;
}
// Instance methods implementing BaseCipher
// -------------------------------------------------------------------------
public Object clone() {
return new DES();
}
public Iterator blockSizes() {
return Collections.singleton(new Integer(BLOCK_SIZE)).iterator();
}
public Iterator keySizes() {
return Collections.singleton(new Integer(KEY_SIZE)).iterator();
}
public Object makeKey(byte[] kb, int bs) throws InvalidKeyException {
if (kb == null || kb.length != KEY_SIZE)
throw new InvalidKeyException("DES keys must be 8 bytes long");
if (Properties.checkForWeakKeys()
&& (isWeak(kb) || isSemiWeak(kb) || isPossibleWeak(kb))) {
throw new WeakKeyException();
}
int i, j, l, m, n;
long pc1m = 0, pcr = 0;
for (i = 0; i < 56; i++) {
l = PC1[i];
pc1m |= ((kb[l >>> 3] & (0x80 >>> (l & 7))) != 0)
? (1L << (55 - i)) : 0;
}
Context ctx = new Context();
// Encryption key first.
for (i = 0; i < 16; i++) {
pcr = 0;
m = i << 1;
n = m + 1;
for (j = 0; j < 28; j++) {
l = j + ROTARS[i];
if (l < 28) pcr |= ((pc1m & 1L << (55 - l)) != 0)
? (1L << (55 - j)) : 0;
else pcr |= ((pc1m & 1L << (55 - (l - 28))) != 0)
? (1L << (55 - j)) : 0;
}
for (j = 28; j < 56; j++) {
l = j + ROTARS[i];
if (l < 56) pcr |= ((pc1m & 1L << (55 - l)) != 0)
? (1L << (55 - j)) : 0;
else pcr |= ((pc1m & 1L << (55 - (l - 28))) != 0)
? (1L << (55 - j)) : 0;
}
for (j = 0; j < 24; j++) {
if ((pcr & 1L << (55 - PC2[j ])) != 0) ctx.ek[m] |= 1 << (23 - j);
if ((pcr & 1L << (55 - PC2[j+24])) != 0) ctx.ek[n] |= 1 << (23 - j);
}
}
// The decryption key is the same, but in reversed order.
for (i = 0; i < Context.EXPANDED_KEY_SIZE; i += 2) {
ctx.dk[30 - i] = ctx.ek[i];
ctx.dk[31 - i] = ctx.ek[i+1];
}
// "Cook" the keys.
for (i = 0; i < 32; i += 2) {
int x, y;
x = ctx.ek[i ];
y = ctx.ek[i+1];
ctx.ek[i ] = ((x & 0x00FC0000) << 6) | ((x & 0x00000FC0) << 10)
| ((y & 0x00FC0000) >>> 10) | ((y & 0x00000FC0) >>> 6);
ctx.ek[i+1] = ((x & 0x0003F000) << 12) | ((x & 0x0000003F) << 16)
| ((y & 0x0003F000) >>> 4) | (y & 0x0000003F);
x = ctx.dk[i ];
y = ctx.dk[i+1];
ctx.dk[i ] = ((x & 0x00FC0000) << 6) | ((x & 0x00000FC0) << 10)
| ((y & 0x00FC0000) >>> 10) | ((y & 0x00000FC0) >>> 6);
ctx.dk[i+1] = ((x & 0x0003F000) << 12) | ((x & 0x0000003F) << 16)
| ((y & 0x0003F000) >>> 4) | (y & 0x0000003F);
}
return ctx;
}
public void encrypt(byte[] in, int i, byte[] out, int o, Object K, int bs) {
desFunc(in, i, out, o, ((Context) K).ek);
}
public void decrypt(byte[] in, int i, byte[] out, int o, Object K, int bs) {
desFunc(in, i, out, o, ((Context) K).dk);
}
// Inner classe(s)
// =========================================================================
/**
* Simple wrapper class around the session keys. Package-private so TripleDES
* can see it.
*/
final class Context {
// Constants and variables
// ----------------------------------------------------------------------
private static final int EXPANDED_KEY_SIZE = 32;
/** The encryption key. */
int[] ek;
/** The decryption key. */
int[] dk;
// Constructor(s)
// ----------------------------------------------------------------------
/** Default 0-arguments constructor. */
Context() {
ek = new int[EXPANDED_KEY_SIZE];
dk = new int[EXPANDED_KEY_SIZE];
}
// Class methods
// ----------------------------------------------------------------------
// Instance methods
// ----------------------------------------------------------------------
byte[] getEncryptionKeyBytes() {
return toByteArray(ek);
}
byte[] getDecryptionKeyBytes() {
return toByteArray(dk);
}
byte[] toByteArray(int[] k) {
byte[] result = new byte[4 * k.length];
for (int i = 0, j = 0; i < k.length; i++) {
result[j++] = (byte)(k[i] >>> 24);
result[j++] = (byte)(k[i] >>> 16);
result[j++] = (byte)(k[i] >>> 8);
result[j++] = (byte) k[i];
}
return result;
}
}
}