Package com.exedio.cope.pattern

Class MessageDigestAlgorithm

java.lang.Object

com.exedio.cope.pattern.MessageDigestAlgorithm

All Implemented Interfaces:

Hash.Algorithm

public final class MessageDigestAlgorithm
extends Object
implements Hash.Algorithm

Uses hash algorithms from MessageDigest.

Author:

Ralf Wiebicke

Constructor Summary

Constructors

Constructor	Description
MessageDigestAlgorithm(String digest, int saltLength, int iterations)

Method Summary

Modifier and Type	Method	Description
boolean	check(byte[] plainText, byte[] hash)	Returns whether the given plain text matches the given hash.
boolean	compatibleTo(Hash.Algorithm other)	Returns whether this algorithm can consistently check hash values created by the given algorithm.
int	getIterations()
int	getSaltLength()
byte[]	hash(byte[] plainText)	Returns a hash for the given plain text.
int	length()
String	name()
MessageDigestAlgorithm	salt(int length, SecureRandom source)

Methods inherited from class java.lang.Object

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

Constructor Detail

MessageDigestAlgorithm

public MessageDigestAlgorithm(String digest,
                              int saltLength,
                              int iterations)

Parameters:

digest - an algorithm name suitable for MessageDigest.getInstance(String).

Method Detail

salt

public MessageDigestAlgorithm salt(int length,
                                   SecureRandom source)

name

public String name()

Specified by:

name in interface Hash.Algorithm

length

public int length()

Specified by:

length in interface Hash.Algorithm

hash

public byte[] hash(byte[] plainText)

Description copied from interface: Hash.Algorithm

Returns a hash for the given plain text. The result is not required to be deterministic - this means, multiple calls for the same plain text do not have to return the same hash. This is especially true for salted hashes.

Specified by:

hash in interface Hash.Algorithm

Parameters:

plainText - the text to be hashed. Is never null.

Returns:

the hash of plainText. Must never return null.

check

public boolean check(byte[] plainText,
                     byte[] hash)

Description copied from interface: Hash.Algorithm

Returns whether the given plain text matches the given hash.

Specified by:

check in interface Hash.Algorithm

Parameters:

plainText - the text to be hashed. Is never null.

hash - the hash of plainText. Is never null.

compatibleTo

public boolean compatibleTo(Hash.Algorithm other)

Description copied from interface: Hash.Algorithm

Returns whether this algorithm can consistently check hash values created by the given algorithm.

Specified by:

compatibleTo in interface Hash.Algorithm

getSaltLength

public int getSaltLength()

getIterations

public int getIterations()