iaik.security.ec.ecdh

Class EdDHKeyAgreement

java.lang.Object

javax.crypto.KeyAgreementSpi

iaik.security.ec.ecdh.EdDHKeyAgreement

public final class EdDHKeyAgreement
extends KeyAgreementSpi

Diffie-Hellman key agreement based on Curve25519 and Curve448, also known as X25519 and X448, respectively, compliant with [1, 2].

References:

[1] A. Langley, M. Hamburg. RFC 7748: Elliptic Curves for Security. https://tools.ietf.org/html/rfc7748

[2] S. Josefsson, J. Schaad. Algorithm Identifiers for Ed25519, Ed448, X25519 and X448 for use in the Internet X.509 Public Key Infrastructure. https://tools.ietf.org/html/draft-ietf-curdle-pkix-10

Author:

Sebastian Ramacher

Constructor Summary

Constructors

Constructor and Description
EdDHKeyAgreement() Creates a new instance.

Method Summary

Modifier and Type	Method and Description
protected Key	engineDoPhase(Key key, boolean lastPhase)
protected byte[]	engineGenerateSecret()
protected int	engineGenerateSecret(byte[] sharedSecret, int offset)
protected SecretKey	engineGenerateSecret(String algorithm)
protected void	engineInit(Key key, AlgorithmParameterSpec params, SecureRandom random)
protected void	engineInit(Key key, SecureRandom random)

Methods inherited from class java.lang.Object

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

Constructor Detail

EdDHKeyAgreement

public EdDHKeyAgreement()

Creates a new instance.

Method Detail

engineDoPhase

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

Specified by:

engineDoPhase in class KeyAgreementSpi

Throws:

InvalidKeyException

IllegalStateException

engineInit

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

Specified by:

engineInit in class KeyAgreementSpi

Throws:

InvalidKeyException

engineInit

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

Specified by:

engineInit in class KeyAgreementSpi

Throws:

InvalidKeyException

InvalidAlgorithmParameterException

engineGenerateSecret

protected byte[] engineGenerateSecret()
                               throws IllegalStateException

Specified by:

engineGenerateSecret in class KeyAgreementSpi

Throws:

IllegalStateException

engineGenerateSecret

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

Specified by:

engineGenerateSecret in class KeyAgreementSpi

Throws:

IllegalStateException

ShortBufferException

engineGenerateSecret

protected SecretKey engineGenerateSecret(String algorithm)
                                  throws IllegalStateException,
                                         InvalidKeyException

Specified by:

engineGenerateSecret in class KeyAgreementSpi

Throws:

IllegalStateException

InvalidKeyException