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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.crypto.spec;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.MGF1ParameterSpec;
/**
* The algorithm parameter specification for the <i>OAEP Padding</i> algorithm.
* <p>
* This padding algorithm is defined in the <a
* href="http://www.ietf.org/rfc/rfc3447.txt">PKCS #1</a> standard.
*/
public class OAEPParameterSpec implements AlgorithmParameterSpec {
private final String mdName;
private final String mgfName;
private final AlgorithmParameterSpec mgfSpec;
private final PSource pSrc;
/**
* The algorithm parameter instance with default values.
* <p>
* It uses the following parameters:
* <ul><li>message digest : <code>"SHA-1"</code></li>
* <li>mask generation function (<i>mgf</i>) : <code>"MGF1"</code></li>
* <li>parameters for the <i>mgf</i> : "SHA-1" {@link MGF1ParameterSpec#SHA1}</li>
* <li>the source of the label <code>L</code>: {@link PSource.PSpecified#DEFAULT}</li>
* </ul>
*/
public static final OAEPParameterSpec DEFAULT = new OAEPParameterSpec();
private OAEPParameterSpec() {
this.mdName = "SHA-1";
this.mgfName = "MGF1";
this.mgfSpec = MGF1ParameterSpec.SHA1;
this.pSrc = PSource.PSpecified.DEFAULT;
}
/**
* Creates a new <code>OAEPParameterSpec</code> instance with the specified
* <i>message digest</i> algorithm name, <i>mask generation function</i>
* (<i>mgf</i>) algorithm name, <i>parameters</i> for the <i>mgf</i>
* algorithm and the <i>source of the label <code>L</code></i>.
*
* @param mdName
* the message digest algorithm name.
* @param mgfName
* the mask generation function algorithm name.
* @param mgfSpec
* the algorithm parameter specification for the mask generation
* function algorithm.
* @param pSrc
* the source of the label <code>L</code>.
* @throws NullPointerException
* if one of <code>mdName</code>, <code>mgfName</code> or
* <code>pSrc</code> is null.
*/
public OAEPParameterSpec(String mdName, String mgfName,
AlgorithmParameterSpec mgfSpec, PSource pSrc) {
if (mdName == null) {
throw new NullPointerException("mdName == null");
} else if (mgfName == null) {
throw new NullPointerException("mgfName == null");
} else if (pSrc == null) {
throw new NullPointerException("pSrc == null");
}
this.mdName = mdName;
this.mgfName = mgfName;
this.mgfSpec = mgfSpec;
this.pSrc = pSrc;
}
/**
* Returns the algorithm name of the <i>message digest</i>.
*
* @return the algorithm name of the message digest.
*/
public String getDigestAlgorithm() {
return mdName;
}
/**
* Returns the algorithm name of the <i>mask generation function</i>.
*
* @return the algorithm name of the mask generation function.
*/
public String getMGFAlgorithm() {
return mgfName;
}
/**
* Returns the algorithm parameter specification for the mask generation
* function algorithm.
*
* @return the algorithm parameter specification for the mask generation
* function algorithm.
*/
public AlgorithmParameterSpec getMGFParameters() {
return mgfSpec;
}
/**
* Returns the source of the label <code>L</code>.
*
* @return the source of the label <code>L</code>.
*/
public PSource getPSource() {
return pSrc;
}
}
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