org.mortbay.jetty.security
Class UnixCrypt

java.lang.Object
  org.mortbay.jetty.security.UnixCrypt

public class UnixCrypt
extends Object

Unix Crypt. Implements the one way cryptography used by Unix systems for simple password protection.

Version:

$Id: UnixCrypt.java,v 1.1 2005/10/05 14:09:14 janb Exp $

Field Summary

private static byte[]	A64TOI
private static long[][]	CF6464
private static byte[]	CIFP
private static byte[]	ExpandTr
private static long[][]	IE3264
private static byte[]	IP
private static byte[]	ITOA64
private static byte[]	P32Tr
private static byte[]	PC1
private static long[][]	PC1ROT
private static byte[]	PC2
private static long[][][]	PC2ROT
private static byte[]	Rotates
private static byte[][]	S
private static long[][]	SPE

Constructor Summary

private

UnixCrypt() You can't call the constructer.

Method Summary

static String	crypt(String key, String setting) Encrypts String into crypt (Unix) code.
private static long	des_cipher(long in, int salt, int num_iter, long[] KS) Returns the DES encrypted code of the given word with the specified environment.
private static long[]	des_setkey(long keyword) Returns the key schedule for the given key.
private static void	init_perm(long[][] perm, byte[] p, int chars_out) Initializes the given permutation table with the mapping table.
static void	main(String[] arg)
private static long	perm3264(int c, long[][] p) Returns the permutation of the given 32-bit code with the specified permutataion table.
private static long	perm6464(long c, long[][] p) Returns the permutation of the given 64-bit code with the specified permutataion table.
private static int	to_six_bit(int num) Returns the transposed and split code of a 24-bit code into a 4-byte code, each having 6 bits.
private static long	to_six_bit(long num) Returns the transposed and split code of two 24-bit code into two 4-byte code, each having 6 bits.

Methods inherited from class java.lang.Object

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

Field Detail

IP

private static final byte[] IP

ExpandTr

private static final byte[] ExpandTr

PC1

private static final byte[] PC1

Rotates

private static final byte[] Rotates

PC2

private static final byte[] PC2

S

private static final byte[][] S

P32Tr

private static final byte[] P32Tr

CIFP

private static final byte[] CIFP

ITOA64

private static final byte[] ITOA64

A64TOI

private static byte[] A64TOI

PC1ROT

private static long[][] PC1ROT

PC2ROT

private static long[][][] PC2ROT

IE3264

private static long[][] IE3264

SPE

private static long[][] SPE

CF6464

private static long[][] CF6464

Constructor Detail

UnixCrypt

private UnixCrypt()

You can't call the constructer.

Method Detail

to_six_bit

private static int to_six_bit(int num)

Returns the transposed and split code of a 24-bit code into a 4-byte code, each having 6 bits.

to_six_bit

private static long to_six_bit(long num)

Returns the transposed and split code of two 24-bit code into two 4-byte code, each having 6 bits.

perm6464

private static long perm6464(long c,
                             long[][] p)

Returns the permutation of the given 64-bit code with the specified permutataion table.

perm3264

private static long perm3264(int c,
                             long[][] p)

Returns the permutation of the given 32-bit code with the specified permutataion table.

des_setkey

private static long[] des_setkey(long keyword)

Returns the key schedule for the given key.

des_cipher

private static long des_cipher(long in,
                               int salt,
                               int num_iter,
                               long[] KS)

Returns the DES encrypted code of the given word with the specified environment.

init_perm

private static void init_perm(long[][] perm,
                              byte[] p,
                              int chars_out)

Initializes the given permutation table with the mapping table.

crypt

public static String crypt(String key,
                           String setting)

Encrypts String into crypt (Unix) code.

Parameters:

key - the key to be encrypted

setting - the salt to be used

Returns:

the encrypted String

main

public static void main(String[] arg)