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gnu.javax.crypto.key.dh

Class DHKeyPairPKCS8Codec

Implemented Interfaces:
IKeyPairCodec
public class DHKeyPairPKCS8Codec
extends Object
implements IKeyPairCodec

Fields inherited from interface gnu.java.security.key.IKeyPairCodec

ASN1_FORMAT, PKCS8_FORMAT, RAW_FORMAT, X509_FORMAT

Method Summary

PrivateKey
decodePrivateKey(byte[] input)
PublicKey
decodePublicKey(byte[] input)
byte[]
encodePrivateKey(PrivateKey key)
Returns the DER-encoded form of the PKCS#8 ASN.1 PrivateKeyInfo representation of a DH private key.
byte[]
encodePublicKey(PublicKey key)
int
getFormatID()
Returns the unique identifier (within this library) of the format used to externalise public and private keys.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

decodePrivateKey

public PrivateKey decodePrivateKey(byte[] input)
Specified by:
decodePrivateKey in interface IKeyPairCodec
Parameters:
input - the byte array to unmarshall into a valid DH PrivateKey instance. MUST NOT be null.
Returns:
a new instance of a GnuDHPrivateKey decoded from the PrivateKeyInfo material fed as input.

decodePublicKey

public PublicKey decodePublicKey(byte[] input)
Specified by:
decodePublicKey in interface IKeyPairCodec
Throws:
InvalidParameterException - ALWAYS.

encodePrivateKey

public byte[] encodePrivateKey(PrivateKey key)
Returns the DER-encoded form of the PKCS#8 ASN.1 PrivateKeyInfo representation of a DH private key. The ASN.1 specification is as follows: 
   PrivateKeyInfo ::= SEQUENCE {
     version              INTEGER, -- MUST be 0
     privateKeyAlgorithm  AlgorithmIdentifier,
     privateKey           OCTET STRING
   }

   AlgorithmIdentifier ::= SEQUENCE {
     algorithm   OBJECT IDENTIFIER,
     parameters  ANY DEFINED BY algorithm OPTIONAL
   }

   DhParams ::= SEQUENCE {
     p  INTEGER, -- odd prime, p=jq +1
     g  INTEGER, -- generator, g
     q  INTEGER  -- factor of p-1
   }

IMPORTANT: with RI's DHGenParameterSpec and DHParameterSpec classes, we may end up with Diffie-Hellman keys that have a null for the q parameter. RFC-2631 DOES NOT allow for an optional value for that parameter, hence we replace such null values with 0, and do the reverse in the corresponding decode method.

Specified by:
encodePrivateKey in interface IKeyPairCodec
Returns:
the DER encoded form of the ASN.1 representation of the PrivateKeyInfo field in an X.509 certificate.

encodePublicKey

public byte[] encodePublicKey(PublicKey key)
Specified by:
encodePublicKey in interface IKeyPairCodec
Throws:
InvalidParameterException - ALWAYS.

getFormatID

public int getFormatID()
Returns the unique identifier (within this library) of the format used to externalise public and private keys.
Specified by:
getFormatID in interface IKeyPairCodec
Returns:
the identifier of the format, the object supports.
DHKeyPairPKCS8Codec.java -- PKCS#8 encoder/decoder for DH keys Copyright (C) 2006 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., 51 Franklin Street, 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.

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