iaik.security.dh

Class ESDHKeyFactory

java.lang.Object

java.security.KeyFactorySpi

iaik.security.dh.ESDHKeyFactory

public final class ESDHKeyFactory
extends java.security.KeyFactorySpi

This class converts Diffie Hellman keys (opaque representation) in their KeySpecs (transparent representation) and vice versa.

• ESDHPublicKey <--> ESDHPublicKeySpec or X509EncodedKeySpec
• ESDHPrivateKey <--> ESDHPrivateKeySpec or PKCS8EncodedKeySpec

To convert, for instance, DER encoded PKCS#8 private key material (e.g. pkcs8_key_spec instantiated from PKCS8EncodedKeySpec) into ESDHPrivateKey representation, use this KeyFactory for ESDH keys:

 KeyFactory dh_key_fac = KeyFactory.getInstance("ESDH");
 ESDHPrivateKey dh_priv_key = (ESDHPrivateKey)dh_key_fac.generatePrivate(pkcs8_key_spec);
 

See Also:

DHPrivateKeySpec, DHPublicKeySpec, ESDHPrivateKeySpec, ESDHPublicKeySpec, ESDHPrivateKey, ESDHPublicKey, ESDHKeyAgreement

Constructor Summary

Constructors

Constructor and Description
ESDHKeyFactory() Default constructor for creating an ESDHKeyFactory.

Method Summary

Modifier and Type	Method and Description
protected java.security.PrivateKey	engineGeneratePrivate(java.security.spec.KeySpec keySpec) Converts the given key specification to a PrivateKey.
protected java.security.PublicKey	engineGeneratePublic(java.security.spec.KeySpec keySpec) Converts the given key specification to a PublicKey.
protected java.security.spec.KeySpec	engineGetKeySpec(java.security.Key key, java.lang.Class classSpec) Converts the given key into the requested key specification (key material).
protected java.security.Key	engineTranslateKey(java.security.Key key) This method can't translate any keys.

Methods inherited from class java.lang.Object

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

Constructor Detail

ESDHKeyFactory

public ESDHKeyFactory()

Default constructor for creating an ESDHKeyFactory. Applications shall use KeyFactory.getInstance("ESDH"); for instantiating a ESDHKeyFactory.

Method Detail

engineGeneratePrivate

protected java.security.PrivateKey engineGeneratePrivate(java.security.spec.KeySpec keySpec)
                                                  throws java.security.spec.InvalidKeySpecException

Converts the given key specification to a PrivateKey. The given key material may either be a ESDHPrivateKeySpec or a PKCS8EncodedKeySpec.

Specified by:

engineGeneratePrivate in class java.security.KeyFactorySpi

Parameters:

keySpec - the key specification as ESDHPrivateKeySpec or PKCS8EncodedKeySpec

Returns:

the resulting PrivateKey

Throws:

java.security.spec.InvalidKeySpecException - if the given key material is not a ESDHPrivateKeySpec or PKCS8EncodedKeySpec

engineGeneratePublic

protected java.security.PublicKey engineGeneratePublic(java.security.spec.KeySpec keySpec)
                                                throws java.security.spec.InvalidKeySpecException

Converts the given key specification to a PublicKey. The given key material may either be a ESDHPublicKeySpec or a X509EncodedKeySpec.

Specified by:

engineGeneratePublic in class java.security.KeyFactorySpi

Parameters:

keySpec - the key specification as ESDHPublicKeySpec or X509EncodedKeySpec

Returns:

the resulting PublicKey

Throws:

java.security.spec.InvalidKeySpecException - if the given key material is not a ESDHPublicKeySpec or X509EncodedKeySpec

engineGetKeySpec

protected java.security.spec.KeySpec engineGetKeySpec(java.security.Key key,
                                                      java.lang.Class classSpec)
                                               throws java.security.spec.InvalidKeySpecException

Converts the given key into the requested key specification (key material). The given key may either be a ESDHPublicKey or a ESDHPrivateKey. If the key is an ESDHPublicKey, this method only can create a ESDHPublicKeySpec or a X509EncodedKeySpec from it. If the given key is a ESDHPrivateKey, a ESDHPrivateKeySpec or a PKCS8EncodedKeySpec may be returned, depending on which of these two types of specifications is requested by classSpec. Each attempt to get key material of a type not matching to a given ESDH key will raise an exception.

Specified by:

engineGetKeySpec in class java.security.KeyFactorySpi

Parameters:

key - the key to be converted, which either may be an ESDHPublicKey or an ESDHPrivateKey.

classSpec - the key specification type into which the key shall be converted, which may be an ESDHPublicKeySpec or a X509EncodedKeySpec if the given key is an ESDHPublicKey, or an ESDHPrivateKeySpec or a PKCS8EncodedKeySpec if the given key is an ESDHPrivateKey

Returns:

the key specification (key material) derived from the given key

Throws:

java.security.spec.InvalidKeySpecException - if the given key cannot be converted into the requested key specification object by this key factory

engineTranslateKey

protected java.security.Key engineTranslateKey(java.security.Key key)
                                        throws java.security.InvalidKeyException

This method can't translate any keys. If already an ESDHPublicKey or an ESDHPrivateKey is given, this key will be returned, otherwise, an exception will be thrown.

Specified by:

engineTranslateKey in class java.security.KeyFactorySpi

Throws:

java.security.InvalidKeyException