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org.wildfly.security.password.impl.BSDUnixDESCryptPasswordImpl Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.security.password.impl;
import static org.wildfly.common.math.HashMath.multiHashOrdered;
import static org.wildfly.security.password.impl.ElytronMessages.log;
import java.io.NotSerializableException;
import java.io.ObjectInputStream;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.InvalidParameterSpecException;
import java.security.spec.KeySpec;
import java.util.Arrays;
import java.util.concurrent.ThreadLocalRandom;
import org.wildfly.security.password.interfaces.BSDUnixDESCryptPassword;
import org.wildfly.security.password.spec.ClearPasswordSpec;
import org.wildfly.security.password.spec.IteratedPasswordAlgorithmSpec;
import org.wildfly.security.password.spec.IteratedSaltedPasswordAlgorithmSpec;
import org.wildfly.security.password.spec.IteratedSaltedHashPasswordSpec;
import org.wildfly.security.password.spec.SaltedHashPasswordSpec;
import org.wildfly.security.password.spec.SaltedPasswordAlgorithmSpec;
/**
* Implementation of the BSD variant of the Unix DES Crypt password.
*
* @author Farah Juma
*/
class BSDUnixDESCryptPasswordImpl extends AbstractPasswordImpl implements BSDUnixDESCryptPassword {
private static final long serialVersionUID = 4537505177089490619L;
private final int iterationCount;
private final int salt;
private final byte[] hash;
BSDUnixDESCryptPasswordImpl(int salt, int iterationCount, byte[] hash) throws InvalidKeySpecException {
this.salt = salt;
this.iterationCount = iterationCount;
if (hash == null || hash.length != BSDUnixDESCryptPassword.BSD_CRYPT_DES_HASH_SIZE) {
throw log.invalidKeySpecBsdDesCryptPasswordHashMustBeBytes(BSDUnixDESCryptPassword.BSD_CRYPT_DES_HASH_SIZE);
}
this.hash = hash.clone();
}
BSDUnixDESCryptPasswordImpl(final IteratedSaltedHashPasswordSpec passwordSpec) throws InvalidKeySpecException, InvalidParameterSpecException {
this(getSaltValue(passwordSpec.getSalt()), passwordSpec.getIterationCount(), passwordSpec.getHash());
}
BSDUnixDESCryptPasswordImpl(final SaltedHashPasswordSpec passwordSpec) throws InvalidKeySpecException, InvalidParameterSpecException {
this(getSaltValue(passwordSpec.getSalt()), DEFAULT_ITERATION_COUNT, passwordSpec.getHash());
}
BSDUnixDESCryptPasswordImpl(final ClearPasswordSpec passwordSpec) throws InvalidKeySpecException {
this(passwordSpec.getEncodedPassword(), ThreadLocalRandom.current().nextInt() & 0xffffff, DEFAULT_ITERATION_COUNT);
}
BSDUnixDESCryptPasswordImpl(final char[] password, final Charset hashCharset) throws InvalidKeySpecException, InvalidParameterSpecException {
this(password, ThreadLocalRandom.current().nextInt() & 0xffffff, DEFAULT_ITERATION_COUNT, hashCharset);
}
BSDUnixDESCryptPasswordImpl(final char[] password, final IteratedSaltedPasswordAlgorithmSpec spec, final Charset hashCharset) throws InvalidKeySpecException, InvalidParameterSpecException {
this(password, getSaltValue(spec.getSalt()), spec.getIterationCount(), hashCharset);
}
BSDUnixDESCryptPasswordImpl(final char[] password, final IteratedPasswordAlgorithmSpec spec, final Charset hashCharset) throws InvalidKeySpecException, InvalidParameterSpecException {
this(password, ThreadLocalRandom.current().nextInt() & 0xffffff, spec.getIterationCount(), hashCharset);
}
BSDUnixDESCryptPasswordImpl(final char[] password, final SaltedPasswordAlgorithmSpec spec, final Charset hashCharset) throws InvalidKeySpecException, InvalidParameterSpecException {
this(password, getSaltValue(spec.getSalt()), DEFAULT_ITERATION_COUNT, hashCharset);
}
BSDUnixDESCryptPasswordImpl(final char[] password, final int salt, final int iterationCount) throws InvalidKeySpecException {
this(salt, iterationCount, generateHash(salt, iterationCount, password));
}
BSDUnixDESCryptPasswordImpl(final char[] password, final int salt, final int iterationCount, final Charset hashCharset) throws InvalidKeySpecException {
this(salt, iterationCount, generateHash(salt, iterationCount, password, hashCharset));
}
BSDUnixDESCryptPasswordImpl(final BSDUnixDESCryptPassword password) throws InvalidKeyException {
this.salt = password.getSalt();
this.iterationCount = password.getIterationCount();
final byte[] hash = password.getHash();
if (hash == null || hash.length != BSDUnixDESCryptPassword.BSD_CRYPT_DES_HASH_SIZE) {
throw log.invalidKeyBsdDesCryptPasswordHashMustBeBytes(BSDUnixDESCryptPassword.BSD_CRYPT_DES_HASH_SIZE);
}
this.hash = hash.clone();
}
private static int getSaltValue(final byte[] saltBytes) throws InvalidParameterSpecException {
if (saltBytes == null || saltBytes.length != BSDUnixDESCryptPassword.BSD_CRYPT_DES_SALT_SIZE) {
throw log.invalidParameterSpecSaltMustBeBytes(BSDUnixDESCryptPassword.BSD_CRYPT_DES_SALT_SIZE);
}
return (saltBytes[0] & 0xff) << 16 | (saltBytes[1] & 0xff) << 8 | saltBytes[2] & 0xff;
}
private static byte[] getSaltBytes(final int saltVal) {
final byte[] bytes = new byte[3];
bytes[0] = (byte) (saltVal >>> 16);
bytes[1] = (byte) (saltVal >>> 8);
bytes[2] = (byte) saltVal;
return bytes;
}
S getKeySpec(final Class keySpecType) throws InvalidKeySpecException {
if (keySpecType.isAssignableFrom(IteratedSaltedHashPasswordSpec.class)) {
return keySpecType.cast(new IteratedSaltedHashPasswordSpec(hash.clone(), getSaltBytes(salt), iterationCount));
}
throw new InvalidKeySpecException();
}
boolean verify(final char[] guess) throws InvalidKeyException {
return verify(guess, StandardCharsets.UTF_8);
}
@Override
boolean verify(char[] guess, Charset hashCharset) throws InvalidKeyException {
return Arrays.equals(hash, generateHash(salt, iterationCount, guess, hashCharset));
}
boolean convertibleTo(final Class keySpecType) {
return keySpecType.isAssignableFrom(IteratedSaltedHashPasswordSpec.class);
}
public String getAlgorithm() {
return BSDUnixDESCryptPassword.ALGORITHM_BSD_CRYPT_DES;
}
@Override
public int getIterationCount() {
return iterationCount;
}
public int getSalt() {
return salt;
}
public byte[] getHash() {
return hash.clone();
}
private static byte[] generateHash(final int salt, int iterationCount, final char[] password) {
final byte[] bytes1 = getNormalizedPasswordBytes(password);
return crypt(bytes1, salt, iterationCount);
}
private static byte[] generateHash(final int salt, int iterationCount, final char[] password, final Charset hashCharset) {
final byte[] bytes1 = getNormalizedPasswordBytes(password, hashCharset);
return crypt(bytes1, salt, iterationCount);
}
// Note that the following DES tables and some of the methods below are based on
// tables and methods from the C implementation of the algorithm that's used by
// FreeBSD, NetBSD, and OpenBSD:
// http://svnweb.freebsd.org/base/head/secure/lib/libcrypt/crypt-des.c?view=markup
private static boolean tablesInitialized = false;
private static final byte[] IP = {
58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7,
};
private static final int[][] ipMaskLeft = new int[8][256];
private static final int[][] ipMaskRight = new int[8][256];
private static final int[][] fpMaskLeft = new int[8][256];
private static final int[][] fpMaskRight = new int[8][256];
private static final int[] initPerm = new int[64];
private static final int[] finalPerm = new int[64];
private static final byte[] keyShifts = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
private static final byte[] keyPerm = {
57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4
};
private static final int[] invKeyPerm = new int[64];
private static final int[][] keyPermMaskLeft = new int[8][128];
private static final int[][] keyPermMaskRight = new int[8][128];
private static final byte[] compPerm = {
14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10,
23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48,
44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32
};
private static final int[] invCompPerm = new int[56];
private static final int[][] compPermMaskLeft = new int[8][128];
private static final int[][] compPermMaskRight = new int[8][128];
private static final byte[][] SBox = {
{
14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13
},
{
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9
},
{
10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
},
{
7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14
},
{
2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3
},
{
12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13
},
{
4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12
},
{
13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11
}
};
private static final int[][] mSBox = new int[4][4096];
private static final byte[][] invSBox = new byte[8][64];
private static final byte[] PBox = {
16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
};
private static final byte[] invPBox = new byte[32];
private static final int[][] PSBox = new int[4][256];
private static final int[] bits32 = {
0x80000000, 0x40000000, 0x20000000, 0x10000000, 0x08000000, 0x04000000, 0x02000000, 0x01000000,
0x00800000, 0x00400000, 0x00200000, 0x00100000, 0x00080000, 0x00040000, 0x00020000, 0x00010000,
0x00008000, 0x00004000, 0x00002000, 0x00001000, 0x00000800, 0x00000400, 0x00000200, 0x00000100,
0x00000080, 0x00000040, 0x00000020, 0x00000010, 0x00000008, 0x00000004, 0x00000002, 0x00000001
};
/**
* Initializes the DES tables.
*/
private static void setupTables() {
int inBit, outBit;
int bits28Offset = 4;
int bits24Offset = 8;
int bits8Offset = 24;
// Invert the S-boxes and then convert them into 4 arrays
int b;
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 64; j++) {
b = (j & 0x20) | ((j & 1) << 4) | ((j >>> 1) & 0xf);
invSBox[i][j] = SBox[i][b];
}
}
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 64; j++) {
for (int k = 0; k < 64; k++) {
mSBox[i][(j << 6) | k] = ((invSBox[(i << 1)][j] << 4) | invSBox[(i << 1) + 1][k]) & 0xff;
}
}
}
// Compute the initial and final permutations and also initialize the inverted key permutation
for (int i = 0; i < 64; i++) {
finalPerm[i] = (IP[i] - 1) & 0xff;
initPerm[finalPerm[i]] = i;
invKeyPerm[i] = 255;
}
// Invert the key permutation and initialize the inverted key compression permutation
for (int i = 0; i < 56; i++) {
invKeyPerm[(keyPerm[i] - 1) & 0xff] = i;
invCompPerm[i] = 255;
}
// Invert the key compression permutation
for (int i = 0; i < 48; i++) {
invCompPerm[(compPerm[i] - 1) & 0xff] = i;
}
// Set up mask arrays
for (int i = 0; i < 8; i++) {
for (int j = 0; j < 256; j++) {
ipMaskLeft[i][j] = 0;
ipMaskRight[i][j] = 0;
fpMaskLeft[i][j] = 0;
fpMaskRight[i][j] = 0;
for (int k = 0; k < 8; k++) {
inBit = 8 * i + k;
if ((j & bits32[bits8Offset + k]) != 0) {
outBit = initPerm[inBit];
if (outBit < 32) {
ipMaskLeft[i][j] |= bits32[outBit];
} else {
ipMaskRight[i][j] |= bits32[outBit - 32];
}
outBit = finalPerm[inBit];
if (outBit < 32) {
fpMaskLeft[i][j] |= bits32[outBit];
} else {
fpMaskRight[i][j] |= bits32[outBit - 32];
}
}
}
}
for (int j = 0; j < 128; j++) {
keyPermMaskLeft[i][j] = 0;
keyPermMaskRight[i][j] = 0;
for (int k = 0; k < 7; k++) {
inBit = 8 * i + k;
if ((j & bits32[bits8Offset + k + 1]) != 0) {
outBit = invKeyPerm[inBit];
if (outBit == 255) {
continue;
} else if (outBit < 28) {
keyPermMaskLeft[i][j] |= bits32[bits28Offset + outBit];
} else {
keyPermMaskRight[i][j] |= bits32[bits28Offset + (outBit - 28)];
}
}
}
compPermMaskLeft[i][j] = 0;
compPermMaskRight[i][j] = 0;
for (int k = 0; k < 7; k++) {
inBit = 7 * i + k;
if ((j & bits32[bits8Offset + k + 1]) != 0) {
outBit = invCompPerm[inBit];
if (outBit == 255) {
continue;
} else if (outBit < 24) {
compPermMaskLeft[i][j] |= bits32[bits24Offset + outBit];
} else {
compPermMaskRight[i][j] |= bits32[bits24Offset + outBit - 24];
}
}
}
}
}
// Invert the P-box permutation
for (int i = 0; i < 32; i++) {
invPBox[(PBox[i] - 1) & 0xff] = (byte) i;
}
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 256; j++) {
PSBox[i][j] = 0;
for (int k = 0; k < 8; k++) {
if ((j & bits32[bits8Offset + k]) != 0) {
PSBox[i][j] |= bits32[invPBox[8 * i + k] & 0xff];
}
}
}
}
tablesInitialized = true;
}
/**
* Hashes the given password using the BSD variant of the Unix DES Crypt algorithm.
*
* @param password the password to be hashed
* @param salt the 24-bit salt to be used
* @param iterationCount the number of iterations to use, must be between 1 and 16777215, inclusive
* @return a {@code byte[]} containing the hashed password
*/
static byte[] crypt(final byte[] password, final int salt, final int iterationCount) {
byte[] hash;
byte[] currentKey;
byte[] nextGroup;
int[] currentSchedule;
if (iterationCount < 1 || iterationCount > 16777215) {
throw log.invalidNumberOfRoundsMustBeIntBetween(1, 16777215);
}
if (!tablesInitialized) {
setupTables();
}
// The first group becomes the initial key
currentKey = getKeyGroup(password, 0);
int nextStartIndex = 8;
int passwordLen = password.length;
while (nextStartIndex < passwordLen) {
currentSchedule = desSetKey(currentKey);
// Encrypt the current key using itself as the input
hash = desCipher(currentSchedule, fourBytesToInt(currentKey, 0), fourBytesToInt(currentKey, 4), 0, 1);
// XOR the result with the next group to get the next key
nextGroup = getKeyGroup(password, nextStartIndex);
for (int i = 0; i < nextGroup.length; i++) {
currentKey[i] = (byte)(hash[i] ^ nextGroup[i]);
}
nextStartIndex += 8;
}
currentSchedule = desSetKey(currentKey);
// Encrypt the current key using an input of 0
hash = desCipher(currentSchedule, 0, 0, salt, iterationCount);
return hash;
}
/**
* Gets the key group from the given password that starts at the given index. The key
* group contains 8 bytes and is such that the byte at index i contains the lower
* 7 bits of the byte at {@code password[startIndex + i]}.
*
* @param password the password
* @param startIndex the index where the key group begins
* @return a {@code byte[]} containing the key group
*/
private static byte[] getKeyGroup(final byte[] password, int startIndex) {
final byte[] keyGroup = new byte[8];
for (int i = 0; i < keyGroup.length; i++) {
keyGroup[i] = 0;
}
int index = startIndex;
for (int i = 0; i < keyGroup.length && index < password.length; i++) {
final int iChar = password[index++];
keyGroup[i] = (byte) (iChar << 1);
}
return keyGroup;
}
/**
* Calculates the key schedule for the given key. The key schedule contains
* 16 subkeys, each of which can be represented by a pair of integers.
*
* @param key the key
* @return an {@code int[]} of size 32 containing the key schedule
*/
private static int[] desSetKey(final byte[] key) {
final int[] schedule = new int[32];
int key0 = fourBytesToInt(key, 0);
int key1 = fourBytesToInt(key, 4);
// Permute the key and split it into two 28-bit subkeys
int k0 = keyPermMaskLeft[0][key0 >>> 25] | keyPermMaskLeft[1][(key0 >>> 17) & 0x7f]
| keyPermMaskLeft[2][(key0 >>> 9) & 0x7f] | keyPermMaskLeft[3][(key0 >>> 1) & 0x7f]
| keyPermMaskLeft[4][key1 >>> 25] | keyPermMaskLeft[5][(key1 >>> 17) & 0x7f]
| keyPermMaskLeft[6][(key1 >>> 9) & 0x7f] | keyPermMaskLeft[7][(key1 >>> 1) & 0x7f];
int k1 = keyPermMaskRight[0][key0 >>> 25] | keyPermMaskRight[1][(key0 >>> 17) & 0x7f]
| keyPermMaskRight[2][(key0 >>> 9) & 0x7f] | keyPermMaskRight[3][(key0 >>> 1) & 0x7f]
| keyPermMaskRight[4][key1 >>> 25] | keyPermMaskRight[5][(key1 >>> 17) & 0x7f]
| keyPermMaskRight[6][(key1 >>> 9) & 0x7f] | keyPermMaskRight[7][(key1 >>> 1) & 0x7f];
// Rotate the subkeys and do the compression permutation
int shifts = 0;
int j = 0;
int t0, t1;
for (int i = 0; i < 16; i++) {
shifts += keyShifts[i] & 0xff;
t0 = (k0 << shifts) | (k0 >>> (28 - shifts));
t1 = (k1 << shifts) | (k1 >>> (28 - shifts));
// Left half of the subkey
schedule[j++] = compPermMaskLeft[0][(t0 >>> 21) & 0x7f] | compPermMaskLeft[1][(t0 >>> 14) & 0x7f]
| compPermMaskLeft[2][(t0 >>> 7) & 0x7f] | compPermMaskLeft[3][t0 & 0x7f]
| compPermMaskLeft[4][(t1 >>> 21) & 0x7f] | compPermMaskLeft[5][(t1 >>> 14) & 0x7f]
| compPermMaskLeft[6][(t1 >>> 7) & 0x7f] | compPermMaskLeft[7][t1 & 0x7f];
// Right half of the subkey
schedule[j++] = compPermMaskRight[0][(t0 >>> 21) & 0x7f] | compPermMaskRight[1][(t0 >>> 14) & 0x7f]
| compPermMaskRight[2][(t0 >>> 7) & 0x7f] | compPermMaskRight[3][t0 & 0x7f]
| compPermMaskRight[4][(t1 >>> 21) & 0x7f] | compPermMaskRight[5][(t1 >>> 14) & 0x7f]
| compPermMaskRight[6][(t1 >>> 7) & 0x7f] | compPermMaskRight[7][t1 & 0x7f];
}
return schedule;
}
/**
* Performs DES encryption using the given key schedule, input block, salt, and iteration count.
*
* @param schedule the key schedule
* @param leftInput the most significant half of the input block
* @param rightInput the least signicant half of the input block
* @param salt the 24-bit salt to be used
* @param iterationCount the number of iterations to use
* @return a {@code byte[]} containing the hashed password
*/
private static byte[] desCipher(final int[] schedule, final int leftInput, final int rightInput, final int salt, final int iterationCount) {
int l, r;
int f = 0;
final byte[] hash = new byte[8];
int rearrangedSalt = setupSalt(salt);
// Initial permutation
l = ipMaskLeft[0][leftInput >>> 24] | ipMaskLeft[1][(leftInput >>> 16) & 0xff] | ipMaskLeft[2][(leftInput >>> 8) & 0xff]
| ipMaskLeft[3][leftInput & 0xff] | ipMaskLeft[4][rightInput >>> 24] | ipMaskLeft[5][(rightInput >>> 16) & 0xff]
| ipMaskLeft[6][(rightInput >>> 8) & 0xff] | ipMaskLeft[7][rightInput & 0xff];
r = ipMaskRight[0][leftInput >>> 24] | ipMaskRight[1][(leftInput >>> 16) & 0xff] | ipMaskRight[2][(leftInput >>> 8) & 0xff]
| ipMaskRight[3][leftInput & 0xff] | ipMaskRight[4][rightInput >>> 24] | ipMaskRight[5][(rightInput >>> 16) & 0xff]
| ipMaskRight[6][(rightInput >>> 8) & 0xff] | ipMaskRight[7][rightInput & 0xff];
int rLeft, rRight;
int k;
for (int i = 0; i < iterationCount; i++) {
k = 0;
for (int j = 0; j < 16; j++) {
// Expand r to 48 bits (simulates the E-box)
rLeft = ((r & 0x00000001) << 23) | ((r & 0xf8000000) >>> 9) | ((r & 0x1f800000) >>> 11)
| ((r & 0x01f80000) >>> 13) | ((r & 0x001f8000) >>> 15);
rRight = ((r & 0x0001f800) << 7) | ((r & 0x00001f80) << 5) | ((r & 0x000001f8) << 3)
| ((r & 0x0000001f) << 1) | ((r & 0x80000000) >>> 31);
// The salt will flip certain bits
f = (rLeft ^ rRight) & rearrangedSalt;
rLeft ^= (f ^ schedule[k++]);
rRight ^= (f ^ schedule[k++]);
// Perform S-box lookups and do the P-box permutation
f = PSBox[0][mSBox[0][rLeft >>> 12]] | PSBox[1][mSBox[1][rLeft & 0xfff]] | PSBox[2][mSBox[2][rRight >>> 12]]
| PSBox[3][mSBox[3][rRight & 0xfff]];
f ^= l;
l = r;
r = f;
}
r = l;
l = f;
}
// Final permutation
int leftOutput, rightOutput;
leftOutput = fpMaskLeft[0][l >>> 24] | fpMaskLeft[1][(l >>> 16) & 0xff] | fpMaskLeft[2][(l >>> 8) & 0xff]
| fpMaskLeft[3][l & 0xff] | fpMaskLeft[4][r >>> 24] | fpMaskLeft[5][(r >>> 16) & 0xff]
| fpMaskLeft[6][(r >>> 8) & 0xff] | fpMaskLeft[7][r & 0xff];
rightOutput = fpMaskRight[0][l >>> 24] | fpMaskRight[1][(l >>> 16) & 0xff] | fpMaskRight[2][(l >>> 8) & 0xff]
| fpMaskRight[3][l & 0xff] | fpMaskRight[4][r >>> 24] | fpMaskRight[5][(r >>> 16) & 0xff]
| fpMaskRight[6][(r >>> 8) & 0xff] | fpMaskRight[7][r & 0xff];
intToFourBytes(leftOutput, hash, 0);
intToFourBytes(rightOutput, hash, 4);
return hash;
}
/**
* Rearranges the bits in the 24-bit salt.
*/
private static int setupSalt(int salt) {
int resultBit = 0x800000;
int saltBit = 1;
int result = 0;
for (int i = 0; i < 24; i++) {
if ((salt & saltBit) != 0) {
result |= resultBit;
}
saltBit <<= 1;
resultBit >>= 1;
}
return result;
}
private static int fourBytesToInt(final byte[] b, int offset) {
// Big-endian format
final byte b4 = b[offset++];
int value = (b4 & 0xff) << 24;
final byte b3 = b[offset++];
value |= (b3 & 0xff) << 16;
final byte b2 = b[offset++];
value |= (b2 & 0xff) << 8;
final byte b1 = b[offset ];
value |= b1 & 0xff;
return value;
}
private static void intToFourBytes(final int iValue, final byte[] b, int offset) {
// Big-endian format
b[offset++] = (byte) (iValue >>> 24 & 0xff);
b[offset++] = (byte) (iValue >>> 16 & 0xff);
b[offset++] = (byte) (iValue >>> 8 & 0xff);
b[offset ] = (byte) (iValue & 0xff);
}
private void readObject(ObjectInputStream ignored) throws NotSerializableException {
throw new NotSerializableException();
}
public int hashCode() {
return multiHashOrdered(multiHashOrdered(Arrays.hashCode(hash), salt), iterationCount);
}
public boolean equals(final Object obj) {
if (! (obj instanceof BSDUnixDESCryptPasswordImpl)) {
return false;
}
BSDUnixDESCryptPasswordImpl other = (BSDUnixDESCryptPasswordImpl) obj;
return iterationCount == other.iterationCount && salt == other.salt && Arrays.equals(hash, other.hash);
}
Object writeReplace() {
return BSDUnixDESCryptPassword.createRaw(getAlgorithm(), hash, salt, iterationCount);
}
public BSDUnixDESCryptPasswordImpl clone() {
return this;
}
}
