de.flexiprovider.core.kdf
Class PBKDF2

java.lang.Object
  |
  +--de.flexiprovider.api.KeyDerivation
        |
        +--de.flexiprovider.core.kdf.PBKDF2

public class PBKDF2

extends KeyDerivation

This class implements the PBKDF2 key derivation function as specified in PKCS #5 v2.0.

Author:

Martin Döring

Field Summary

static java.lang.String

OID The OID of PBKDF2.

Constructor Summary

PBKDF2()

Method Summary

byte[]	deriveKey(int keySize) Start the derivation process and return the derived key.
void	init(byte[] secret, AlgorithmParameterSpec params) Initialize this KDF with a secret and parameters.

Methods inherited from class java.lang.Object

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

Field Detail

OID

public static final java.lang.String OID

The OID of PBKDF2.

Constructor Detail

PBKDF2

public PBKDF2()

Method Detail

init

public void init(byte[] secret,
                 AlgorithmParameterSpec params)
          throws InvalidKeyException,
                 InvalidAlgorithmParameterException

Initialize this KDF with a secret and parameters. The supported parameters type is PBKDF2ParameterSpec.

Overrides:

init in class KeyDerivation

Parameters:

secret - the secret from which to derive the key

params - the parameters

Throws:

InvalidKeyException - if the secret is null.

InvalidAlgorithmParameterException - if the parameters are not an instance of PBKDF2ParameterSpec.

deriveKey

public byte[] deriveKey(int keySize)

Start the derivation process and return the derived key. If supported by the concrete implementation, the derived key will be of the specified length.

Overrides:

deriveKey in class KeyDerivation

Parameters:

keySize - the desired length of the derived key

Returns:

the derived key with the specified length, or null if the key size is < 0.