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* Copyright (c) 2003, 2007, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
package javax.crypto.spec;
import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;
/**
* This class specifies the source for encoding input P in OAEP Padding,
* as defined in the
* <a href="http://www.ietf.org/rfc/rfc3447.txt">PKCS #1</a>
* standard.
* <pre>
* PKCS1PSourceAlgorithms ALGORITHM-IDENTIFIER ::= {
* { OID id-pSpecified PARAMETERS OCTET STRING },
* ... -- Allows for future expansion --
* }
* </pre>
* @author Valerie Peng
*
* @since 1.5
*/
public class PSource {
private String pSrcName;
/**
* Constructs a source of the encoding input P for OAEP
* padding as defined in the PKCS #1 standard using the
* specified PSource algorithm.
* @param pSrcName the algorithm for the source of the
* encoding input P.
* @exception NullPointerException if <code>pSrcName</code>
* is null.
*/
protected PSource(String pSrcName) {
if (pSrcName == null) {
throw new NullPointerException("pSource algorithm is null");
}
this.pSrcName = pSrcName;
}
/**
* Returns the PSource algorithm name.
*
* @return the PSource algorithm name.
*/
public String getAlgorithm() {
return pSrcName;
}
/**
* This class is used to explicitly specify the value for
* encoding input P in OAEP Padding.
*
* @since 1.5
*/
public static final class PSpecified extends PSource {
private byte[] p = new byte[0];
/**
* The encoding input P whose value equals byte[0].
*/
public static final PSpecified DEFAULT = new PSpecified(new byte[0]);
/**
* Constructs the source explicitly with the specified
* value <code>p</code> as the encoding input P.
* Note:
* @param p the value of the encoding input. The contents
* of the array are copied to protect against subsequent
* modification.
* @exception NullPointerException if <code>p</code> is null.
*/
public PSpecified(byte[] p) {
super("PSpecified");
this.p = (byte[]) p.clone();
}
/**
* Returns the value of encoding input P.
* @return the value of encoding input P. A new array is
* returned each time this method is called.
*/
public byte[] getValue() {
return (p.length==0? p: (byte[])p.clone());
}
}
}