org.sterl.hash.bcrypt

Class BCryptPasswordEncoder

java.lang.Object

org.sterl.hash.bcrypt.BCryptPasswordEncoder

All Implemented Interfaces:

PasswordHasher

public class BCryptPasswordEncoder
extends Object
implements PasswordHasher

Implementation of PasswordEncoder that uses the BCrypt strong hashing function. Clients can optionally supply a "version" ($2a, $2b, $2y) and a "strength" (a.k.a. log rounds in BCrypt) and a SecureRandom instance. The larger the strength parameter the more work will have to be done (exponentially) to hash the passwords. The default value is 10.

Author:

Dave Syer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	BCryptPasswordEncoder.BCryptVersion Stores the default bcrypt version for use in configuration.

Constructor Summary

Constructors

Constructor and Description
BCryptPasswordEncoder()
BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version)
BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version, int strength)
BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version, int strength, SecureRandom random)
BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version, SecureRandom random)
BCryptPasswordEncoder(int strength)
BCryptPasswordEncoder(int strength, SecureRandom random)

Method Summary

Modifier and Type	Method and Description
String	encode(CharSequence rawPassword) Encode the raw password.
boolean	matches(CharSequence rawPassword, String encodedPassword) Verify the encoded password obtained from storage matches the submitted raw password after it too is encoded.
String	toString()
boolean	upgradeEncoding(String encodedPassword) Returns true if the encoded password should be encoded again for better security, else false.

Methods inherited from class java.lang.Object

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

Constructor Detail

BCryptPasswordEncoder

public BCryptPasswordEncoder()

BCryptPasswordEncoder

public BCryptPasswordEncoder(int strength)

Parameters:

strength - the log rounds to use, between 4 and 31

BCryptPasswordEncoder

public BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version)

Parameters:

version - the version of bcrypt, can be 2a,2b,2y

BCryptPasswordEncoder

public BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version,
                             SecureRandom random)

Parameters:

version - the version of bcrypt, can be 2a,2b,2y

random - the secure random instance to use

BCryptPasswordEncoder

public BCryptPasswordEncoder(int strength,
                             SecureRandom random)

Parameters:

strength - the log rounds to use, between 4 and 31

random - the secure random instance to use

BCryptPasswordEncoder

public BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version,
                             int strength)

Parameters:

version - the version of bcrypt, can be 2a,2b,2y

strength - the log rounds to use, between 4 and 31

BCryptPasswordEncoder

public BCryptPasswordEncoder(BCryptPasswordEncoder.BCryptVersion version,
                             int strength,
                             SecureRandom random)

Parameters:

version - the version of bcrypt, can be 2a,2b,2y

strength - the log rounds to use, between 4 and 31

random - the secure random instance to use

Method Detail

encode

public String encode(CharSequence rawPassword)

Encode the raw password. Generally, a good encoding algorithm applies a SHA-1 or greater hash combined with an 8-byte or greater randomly generated salt.

Specified by:

encode in interface PasswordHasher

Parameters:

rawPassword - the raw password to encode

Returns:

the hashed / encoded password

matches

public boolean matches(CharSequence rawPassword,
                       String encodedPassword)

Verify the encoded password obtained from storage matches the submitted raw password after it too is encoded. Returns true if the passwords match, false if they do not. The stored password itself is never decoded.

Specified by:

matches in interface PasswordHasher

Parameters:

rawPassword - the raw password to encode and match

encodedPassword - the encoded password from storage to compare with

Returns:

true if the raw password, after encoding, matches the encoded password from storage

upgradeEncoding

public boolean upgradeEncoding(String encodedPassword)

Returns true if the encoded password should be encoded again for better security, else false. The default implementation always returns false.

Parameters:

encodedPassword - the encoded password to check

Returns:

true if the encoded password should be encoded again for better security, else false.

toString

public String toString()

Overrides:

toString in class Object