IT. Expert System.

public class MyKeyAgreementSpi
extends KeyAgreementSpi

• Constructor Summary

  Constructors

  Constructor and Description
  MyKeyAgreementSpi()

• Method Summary

  Methods

  Modifier and Type	Method and Description
  protected Key	engineDoPhase(Key key, boolean lastPhase) Does the next (or the last) phase of the key agreement, using the specified key.
  protected byte[]	engineGenerateSecret() Generates the shared secret.
  protected int	engineGenerateSecret(byte[] sharedSecret, int offset) Generates the shared secret and stores it into the buffer sharedSecred at offset.
  protected SecretKey	engineGenerateSecret(String algorithm) Generates the shared secret.
  protected void	engineInit(Key key, AlgorithmParameterSpec params, SecureRandom random) Initializes this KeyAgreementSpi with the specified key, algorithm parameters and randomness source.
  protected void	engineInit(Key key, SecureRandom random) Initializes this KeyAgreementSpi with the specified key and the specified randomness source.

  • Methods inherited from class java.lang.Object

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

• Constructor Detail

  • MyKeyAgreementSpi

    public MyKeyAgreementSpi()

• Method Detail

  • engineDoPhase

    protected Key engineDoPhase(Key key,
                    boolean lastPhase)
                         throws InvalidKeyException,
                                IllegalStateException

    Description copied from class: KeyAgreementSpi
    Does the next (or the last) phase of the key agreement, using the specified key.

    Specified by:

    engineDoPhase in class KeyAgreementSpi

    Parameters:

    key - the key received from the other party for this phase.

    lastPhase - set to true if this is the last phase of this key agreement.

    Returns:

    the intermediate key from this phase or null if there is no intermediate key for this phase.

    Throws:

    InvalidKeyException - if the specified key cannot be used in this key agreement or this phase,

    IllegalStateException - if this instance has not been initialized.

  • engineGenerateSecret

    protected byte[] engineGenerateSecret()
                                   throws IllegalStateException

    Description copied from class: KeyAgreementSpi
    Generates the shared secret.

    Specified by:

    engineGenerateSecret in class KeyAgreementSpi

    Returns:

    the generated shared secret.

    Throws:

    IllegalStateException - if this key agreement is not complete.

  • engineGenerateSecret

    protected int engineGenerateSecret(byte[] sharedSecret,
                           int offset)
                                throws IllegalStateException,
                                       ShortBufferException

    Description copied from class: KeyAgreementSpi
    Generates the shared secret and stores it into the buffer sharedSecred at offset.

    Specified by:

    engineGenerateSecret in class KeyAgreementSpi

    Parameters:

    sharedSecret - the buffer to store the shared secret.

    offset - the offset in the buffer.

    Returns:

    the number of bytes stored in the buffer.

    Throws:

    IllegalStateException - if this key agreement is not complete.

    ShortBufferException - if the specified buffer is too small for the shared secret.

  • engineGenerateSecret

    protected SecretKey engineGenerateSecret(String algorithm)
                                      throws IllegalStateException,
                                             NoSuchAlgorithmException,
                                             InvalidKeyException

    Description copied from class: KeyAgreementSpi
    Generates the shared secret.

    Specified by:

    engineGenerateSecret in class KeyAgreementSpi

    Parameters:

    algorithm - the algorithm to for the SecretKey

    Returns:

    the shared secret as a SecretKey of the specified algorithm.

    Throws:

    IllegalStateException - if this key agreement is not complete.

    NoSuchAlgorithmException - if the specified algorithm for the secret key does not exists.

    InvalidKeyException - if a SecretKey with the specified algorithm cannot be created using the generated shared secret.

  • engineInit

    protected void engineInit(Key key,
                  SecureRandom random)
                       throws InvalidKeyException

    Description copied from class: KeyAgreementSpi
    Initializes this KeyAgreementSpi with the specified key and the specified randomness source.

    Specified by:

    engineInit in class KeyAgreementSpi

    Parameters:

    key - the key to initialize this key agreement.

    random - the source for any randomness needed.

    Throws:

    InvalidKeyException - if the specified key cannot be used to initialize this key agreement.

  • engineInit

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

    Description copied from class: KeyAgreementSpi
    Initializes this KeyAgreementSpi with the specified key, algorithm parameters and randomness source.

    Specified by:

    engineInit in class KeyAgreementSpi

    Parameters:

    key - the key to initialize this key agreement.

    params - the parameters for this key agreement algorithm.

    random - the source for any randomness needed.

    Throws:

    InvalidKeyException - if the specified key cannot be used to initialize this key agreement.

    InvalidAlgorithmParameterException - if the specified parameters are invalid for this key agreement algorithm.