/**@class java.security.KeyFactorySpi
@extends java.lang.Object

 This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
 for the {@code KeyFactory} class.
 All the abstract methods in this class must be implemented by each
 cryptographic service provider who wishes to supply the implementation
 of a key factory for a particular algorithm.

 <P> Key factories are used to convert <I>keys</I> (opaque
 cryptographic keys of type {@code Key}) into <I>key specifications</I>
 (transparent representations of the underlying key material), and vice
 versa.

 <P> Key factories are bi-directional. That is, they allow you to build an
 opaque key object from a given key specification (key material), or to
 retrieve the underlying key material of a key object in a suitable format.

 <P> Multiple compatible key specifications may exist for the same key.
 For example, a DSA public key may be specified using
 {@code DSAPublicKeySpec} or
 {@code X509EncodedKeySpec}. A key factory can be used to translate
 between compatible key specifications.

 <P> A provider should document all the key specifications supported by its
 key factory.

 @author Jan Luehe


 @see KeyFactory
 @see Key
 @see PublicKey
 @see PrivateKey
 @see java.security.spec.KeySpec
 @see java.security.spec.DSAPublicKeySpec
 @see java.security.spec.X509EncodedKeySpec

 @since 1.2
*/
var KeyFactorySpi = {


};