org.apache.commons.codec.digest

Class UnixCrypt

java.lang.Object

org.apache.commons.codec.digest.UnixCrypt

public class UnixCrypt
extends Object

Unix crypt(3) algorithm implementation.

This class only implements the traditional 56 bit DES based algorithm. Please use DigestUtils.crypt() for a method that distinguishes between all the algorithms supported in the current glibc's crypt().

The Java implementation was taken from the JetSpeed Portal project (see org.apache.jetspeed.services.security.ldap.UnixCrypt).

This class is slightly incompatible if the given salt contains characters that are not part of the allowed range [a-zA-Z0-9./].

This class is immutable and thread-safe.

Since:

1.7

Constructor Summary

Constructors

Constructor and Description
UnixCrypt()

Method Summary

Modifier and Type	Method and Description
static String	crypt(byte[] original) Generates a crypt(3) compatible hash using the DES algorithm.
static String	crypt(byte[] original, String salt) Generates a crypt(3) compatible hash using the DES algorithm.
static String	crypt(String original) Generates a crypt(3) compatible hash using the DES algorithm.
static String	crypt(String original, String salt) Generates a crypt(3) compatible hash using the DES algorithm.

Methods inherited from class java.lang.Object

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

Constructor Detail

UnixCrypt

public UnixCrypt()

Method Detail

crypt

public static String crypt(byte[] original)

Generates a crypt(3) compatible hash using the DES algorithm.

A salt is generated for you using ThreadLocalRandom; for more secure salts consider using SecureRandom to generate your own salts and calling crypt(byte[], String).

Parameters:

original - plaintext password

Returns:

a 13 character string starting with the salt string

crypt

public static String crypt(byte[] original,
                           String salt)

Generates a crypt(3) compatible hash using the DES algorithm.

Using unspecified characters as salt results incompatible hash values.

Parameters:

original - plaintext password

salt - a two character string drawn from [a-zA-Z0-9./]. The salt may be null, in which case a salt is generated for you using ThreadLocalRandom; for more secure salts consider using SecureRandom to generate your own salts.

Returns:

a 13 character string starting with the salt string

Throws:

IllegalArgumentException - if the salt does not match the allowed pattern

crypt

public static String crypt(String original)

Generates a crypt(3) compatible hash using the DES algorithm.

A salt is generated for you using ThreadLocalRandom; for more secure salts consider using SecureRandom to generate your own salts and calling crypt(String, String).

Parameters:

original - plaintext password

Returns:

a 13 character string starting with the salt string

crypt

public static String crypt(String original,
                           String salt)

Generates a crypt(3) compatible hash using the DES algorithm.

Parameters:

original - plaintext password

salt - a two character string drawn from [a-zA-Z0-9./]. The salt may be null, in which case a salt is generated for you using ThreadLocalRandom; for more secure salts consider using SecureRandom to generate your own salts.

Returns:

a 13 character string starting with the salt string

Throws:

IllegalArgumentException - if the salt does not match the allowed pattern