anon.crypto
Class DESCrypt

java.lang.Object
  anon.crypto.DESCrypt

All Implemented Interfaces:

ICrypt

public class DESCrypt
extends java.lang.Object
implements ICrypt

DESCrypt.java Java-based implementation of the unix crypt command Based upon C source code written by Eric Young, eay@psych.uq.oz.au from http://locutus.kingwoodcable.com/jfd/crypt.html

Field Summary

private static int[]	con_salt
private static int[]	cov_2char
private static int	ITERATIONS
private static char[]	saltChars
private static boolean[]	shifts2
private static int[][]	skb
private static int[][]	SPtrans

Constructor Summary

DESCrypt()

Method Summary

private static int[]	body(int[] schedule, int Eswap0, int Eswap1)
private static int	byteToUnsigned(byte b)
java.lang.String	crypt(java.lang.String original) Encrypt a password given the cleartext password.
java.lang.String	crypt(java.lang.String original, java.lang.String salt) Creates a UNIX/BSD/Linux-compatible hash value from a password String and a salt value.
private static int	D_ENCRYPT(int L, int R, int S, int E0, int E1, int[] s)
private static int[]	des_set_key(byte[] key)
private static int	fourBytesToInt(byte[] b, int offset)
private static int	HPERM_OP(int a, int n, int m)
private static void	intToFourBytes(int iValue, byte[] b, int offset)
private static void	PERM_OP(int a, int b, int n, int m, int[] results)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ITERATIONS

private static final int ITERATIONS

See Also:

Constant Field Values

saltChars

private static final char[] saltChars

con_salt

private static final int[] con_salt

shifts2

private static final boolean[] shifts2

skb

private static final int[][] skb

SPtrans

private static final int[][] SPtrans

cov_2char

private static final int[] cov_2char

Constructor Detail

DESCrypt

public DESCrypt()

Method Detail

byteToUnsigned

private static final int byteToUnsigned(byte b)

fourBytesToInt

private static int fourBytesToInt(byte[] b,
                                  int offset)

intToFourBytes

private static final void intToFourBytes(int iValue,
                                         byte[] b,
                                         int offset)

PERM_OP

private static final void PERM_OP(int a,
                                  int b,
                                  int n,
                                  int m,
                                  int[] results)

HPERM_OP

private static final int HPERM_OP(int a,
                                  int n,
                                  int m)

des_set_key

private static int[] des_set_key(byte[] key)

D_ENCRYPT

private static final int D_ENCRYPT(int L,
                                   int R,
                                   int S,
                                   int E0,
                                   int E1,
                                   int[] s)

body

private static final int[] body(int[] schedule,
                                int Eswap0,
                                int Eswap1)

crypt

public final java.lang.String crypt(java.lang.String original)

Encrypt a password given the cleartext password. This method generates a random salt using the 'java.security.SecureRandom' class.

Specified by:

crypt in interface ICrypt

Parameters:

original - The password to be encrypted.

Returns:

A string consisting of the 2-character salt followed by the encrypted password.

See John Dumas's Java Crypt page for the original source.

crypt

public final java.lang.String crypt(java.lang.String original,
                                    java.lang.String salt)

Description copied from interface: ICrypt

Creates a UNIX/BSD/Linux-compatible hash value from a password String and a salt value. The maximum length of the salt may vary with the algorithm

Specified by:

crypt in interface ICrypt

Parameters:

original - a password as String

salt - a salt as String; the maximum length may vary

Returns:

a hash value for the password