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diff --git a/libjava/java/security/KeyFactorySpi.java b/libjava/java/security/KeyFactorySpi.java
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+/* KeyFactorySpi.java --- Key Factory Service Provider Interface
+   Copyright (C) 1999 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+As a special exception, if you link this library with other files to
+produce an executable, this library does not by itself cause the
+resulting executable to be covered by the GNU General Public License.
+This exception does not however invalidate any other reasons why the
+executable file might be covered by the GNU General Public License. */
+
+package java.security;
+import java.security.spec.KeySpec;
+import java.security.spec.InvalidKeySpecException;
+
+/**
+   KeyFactorySpi is the Service Provider Interface (SPI) for the 
+   KeyFactory class. This is the interface for providers to 
+   supply to implement a key factory for an algorithm.
+
+   Key factories are used to convert keys (opaque cryptographic 
+   keys of type Key) into key specifications (transparent 
+   representations of the underlying key material).
+
+   Key factories are bi-directional. They allow a key class 
+   to be converted into a key specification (key material) and
+   back again.
+
+   For example DSA public keys can be specified as 
+   DSAPublicKeySpec or X509EncodedKeySpec. The key factory
+   translate these key specifications. 
+
+   @since JDK 1.2
+   @author Mark Benvenuto
+ */
+public abstract class KeyFactorySpi
+{
+  /**
+     Constucts a new KeyFactorySpi.
+   */
+  public KeyFactorySpi()
+  {
+  }
+
+  /**
+     Generates a public key from the provided key specification.
+
+     @param keySpec key specification
+
+     @return the public key
+
+     @throws InvalidKeySpecException invalid key specification for
+     this key factory to produce a public key
+   */
+  protected abstract PublicKey engineGeneratePublic(KeySpec keySpec)
+    throws InvalidKeySpecException;
+
+
+  /**
+     Generates a private key from the provided key specification.
+
+     @param keySpec key specification
+
+     @return the private key
+
+     @throws InvalidKeySpecException invalid key specification for
+     this key factory to produce a private key
+   */
+  protected abstract PrivateKey engineGeneratePrivate(KeySpec keySpec)
+    throws InvalidKeySpecException;
+
+  /**
+     Returns a key specification for the given key. keySpec 
+     identifies the specification class to return the key 
+     material in.
+
+     @param key the key
+     @param keySpec the specification class to return the 
+     key material in.
+
+     @return the key specification in an instance of the requested
+     specification class
+
+     @throws InvalidKeySpecException the requested key specification
+     is inappropriate for this key or the key is 
+     unrecognized.
+   */
+  protected abstract KeySpec engineGetKeySpec(Key key, Class keySpec)
+    throws InvalidKeySpecException;
+
+
+  /**
+     Translates the key from an unknown or untrusted provider
+     into a key for this key factory.
+
+     @param the key from an unknown or untrusted provider
+
+     @return the translated key
+
+     @throws InvalidKeySpecException if the key cannot be 
+     processed by this key factory
+   */
+  protected abstract Key engineTranslateKey(Key key)
+    throws InvalidKeyException;
+}