KeyFactorySpi

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## java.security
Class KeyFactorySpi

    java.lang.Object
      java.security.KeyFactorySpi

    public abstract class KeyFactorySpi

extends Object

This class defines the Service Provider Interface (SPI) for the `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.

Key factories are used to convert keys (opaque cryptographic keys of type `Key`) into key specifications (transparent representations of the underlying key material), and vice versa.

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.

Multiple compatible key specifications may exist for the same key. For example, a DSA public key may be specified using `DSAPublicKeySpec` or `X509EncodedKeySpec`. A key factory can be used to translate between compatible key specifications.

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

Since:
  1.2
Version:
  1.8, 02/02/00
Author:
  Jan Luehe
See Also:
  `KeyFactory`, `Key`, `PublicKey`, `PrivateKey`, `KeySpec`, `DSAPublicKeySpec`, `X509EncodedKeySpec`

Constructor Summary
`KeyFactorySpi()`

Method Summary

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### KeyFactorySpi

    public KeyFactorySpi()

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