iaik.pkcs.pkcs12
Class MacKeyGenerator

java.lang.Object
  |
  +--javax.crypto.KeyGeneratorSpi
        |
        +--iaik.pkcs.pkcs12.KeyMaterialGenerator
              |
              +--iaik.pkcs.pkcs12.MacKeyGenerator

public class MacKeyGenerator

extends iaik.pkcs.pkcs12.KeyMaterialGenerator

This class uses the KeyMaterialGenerator for deriving a PKCS#12 MAC-Key from a password, a salt and an iteration count. This MAC-SecretKey is used for the PKCS#12 MAC operations.

Version:

File Revision 11

See Also:

KeyMaterialGenerator

Field Summary

protected String	hash_algorithm
protected int	ID

Constructor Summary

MacKeyGenerator()
Default Constructor.

Method Summary

protected SecretKey	engineGenerateKey() Generates the desired key material and returns it as a SecretKey.
protected void	engineInit(AlgorithmParameterSpec params, SecureRandom random) Inits this KeyMaterialGenerator.
protected void	engineInit(int keylen, SecureRandom random) Sets the lenght of the key to generate.
protected void	engineInit(SecureRandom random) Not implemented.

Methods inherited from class java.lang.Object

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

Field Detail

ID

protected int ID

hash_algorithm

protected String hash_algorithm

Constructor Detail

MacKeyGenerator

public MacKeyGenerator()

Default Constructor. Initializes the KeyMaterialGenerator for generating a MAC-SecretKey.

Method Detail

engineInit

protected void engineInit(AlgorithmParameterSpec params,
                          SecureRandom random)
                   throws InvalidAlgorithmParameterException

Inits this KeyMaterialGenerator.

Overrides:

engineInit in class KeyGeneratorSpi

Parameters:

params - the required parameters as PBEKeyAndParameterSpec

random - not needed by this key generator

engineInit

protected void engineInit(int keylen,
                          SecureRandom random)

Sets the lenght of the key to generate. This method overwrites the key length taken form the PBEKeyAndParameterSpec.

Overrides:

engineInit in class KeyGeneratorSpi

Following copied from class: javax.crypto.KeyGeneratorSpi

Parameters:

strength - the strength of the key to be created

random - the random seed

engineInit

protected void engineInit(SecureRandom random)

Not implemented.

Overrides:

engineInit in class KeyGeneratorSpi

Following copied from class: javax.crypto.KeyGeneratorSpi

Parameters:

random - the random seed

See Also:

KeyGenerator.init(java.security.SecureRandom)

engineGenerateKey

protected SecretKey engineGenerateKey()

Generates the desired key material and returns it as a SecretKey. Note that this method also returns IVs as SecretKey objects since there is no method for returning an IvParameterSpec. The algorithm name of the returned key is set to "RAW" and may be later changed by the calling application, if required:

 String algorithm = ...;
 KeyGenerator keyGen = KeyGenerator.getInstance("PKCS#12", "IAIK");
 ...
 iaik.security.cipher.SecretKey secretKey = (iaik.security.cipher.SecretKey)keyGen.generateKey();
 secretKey.setAlgorithm(algorithm);
 

Overrides:

engineGenerateKey in class KeyGeneratorSpi

Following copied from class: javax.crypto.KeyGeneratorSpi

Returns:

the generated secret key

See Also:

KeyGenerator.generateKey()