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diff --git a/libjava/classpath/gnu/java/security/key/IKeyPairCodec.java b/libjava/classpath/gnu/java/security/key/IKeyPairCodec.java
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+/* IKeyPairCodec.java --
+   Copyright 2001, 2002, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
+USA
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version.  */
+
+
+package gnu.java.security.key;
+
+import gnu.java.security.Registry;
+
+import java.security.PrivateKey;
+import java.security.PublicKey;
+
+/**
+ * The visible methods of an object that knows how to encode and decode
+ * cryptographic asymmetric keypairs. Codecs are useful for (a) externalising
+ * public and private keys for storage and on-the-wire transmission, as well as
+ * (b) re-creating their internal Java representation from external sources.
+ */
+public interface IKeyPairCodec
+{
+  /** Constant identifying the <i>Raw</i> encoding format. */
+  int RAW_FORMAT = Registry.RAW_ENCODING_ID;
+
+  /** Constant identifying the <i>X.509</i> encoding format. */
+  int X509_FORMAT = Registry.X509_ENCODING_ID;
+
+  /** Constant identifying the <i>PKCS#8</i> encoding format. */
+  int PKCS8_FORMAT = Registry.PKCS8_ENCODING_ID;
+
+  /**
+   * Constant identifying the <i>ASN.1</i> encoding format: a combined encoding
+   * of <i>X.509</i> for public keys, and <i>PKCS#8</i> for private ones.
+   */
+  int ASN1_FORMAT = Registry.ASN1_ENCODING_ID;
+
+  /**
+   * Returns the unique identifier (within this library) of the format used to
+   * externalise public and private keys.
+   *
+   * @return the identifier of the format, the object supports.
+   */
+  int getFormatID();
+
+  /**
+   * Encodes an instance of a public key for storage or transmission purposes.
+   *
+   * @param key the non-null key to encode.
+   * @return a byte sequence representing the encoding of the designated key
+   *         according to the format supported by this codec.
+   * @exception IllegalArgumentException if the designated key is not supported
+   *              by this codec.
+   */
+  byte[] encodePublicKey(PublicKey key);
+
+  /**
+   * Encodes an instance of a private key for storage or transmission purposes.
+   *
+   * @param key the non-null key to encode.
+   * @return a byte sequence representing the encoding of the designated key
+   *         according to the format supported by this codec.
+   * @exception IllegalArgumentException if the designated key is not supported
+   *              by this codec.
+   */
+  byte[] encodePrivateKey(PrivateKey key);
+
+  /**
+   * Decodes an instance of an external public key into its native Java
+   * representation.
+   *
+   * @param input the source of the externalised key to decode.
+   * @return a concrete instance of a public key, reconstructed from the
+   *         designated input.
+   * @exception IllegalArgumentException if the designated input does not
+   *              contain a known representation of a public key for the format
+   *              supported by the concrete codec.
+   */
+  PublicKey decodePublicKey(byte[] input);
+
+  /**
+   * Decodes an instance of an external private key into its native Java
+   * representation.
+   *
+   * @param input the source of the externalised key to decode.
+   * @return a concrete instance of a private key, reconstructed from the
+   *         designated input.
+   * @exception IllegalArgumentException if the designated input does not
+   *              contain a known representation of a private key for the format
+   *              supported by the concrete codec.
+   */
+  PrivateKey decodePrivateKey(byte[] input);
+}