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	/*
	* Copyright (c) 2003, 2018, 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.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package javax.crypto.spec;

	import java.math.BigInteger;
	import java.security.spec.AlgorithmParameterSpec;
	import java.security.spec.MGF1ParameterSpec;

	/**
	* This class specifies the set of parameters used with OAEP Padding,
	* as defined in the
	* <a href="https://tools.ietf.org/rfc/rfc8017.txt">PKCS#1 v2.2</a> standard.
	*
	* Its ASN.1 definition in PKCS#1 standard is described below:
	* <pre>
	* RSAES-OAEP-params ::= SEQUENCE {
	* hashAlgorithm [0] HashAlgorithm DEFAULT sha1,
	* maskGenAlgorithm [1] MaskGenAlgorithm DEFAULT mgf1SHA1,
	* pSourceAlgorithm [2] PSourceAlgorithm DEFAULT pSpecifiedEmpty
	* }
	* </pre>
	* where
	* <pre>
	* HashAlgorithm ::= AlgorithmIdentifier {
	* {OAEP-PSSDigestAlgorithms}
	* }
	* MaskGenAlgorithm ::= AlgorithmIdentifier { {PKCS1MGFAlgorithms} }
	* PSourceAlgorithm ::= AlgorithmIdentifier {
	* {PKCS1PSourceAlgorithms}
	* }
	*
	* OAEP-PSSDigestAlgorithms ALGORITHM-IDENTIFIER ::= {
	* { OID id-sha1 PARAMETERS NULL }\|
	* { OID id-sha224 PARAMETERS NULL }\|
	* { OID id-sha256 PARAMETERS NULL }\|
	* { OID id-sha384 PARAMETERS NULL }\|
	* { OID id-sha512 PARAMETERS NULL }\|
	* { OID id-sha512-224 PARAMETERS NULL }\|
	* { OID id-sha512-256 PARAMETERS NULL },
	* ... -- Allows for future expansion --
	* }
	* PKCS1MGFAlgorithms ALGORITHM-IDENTIFIER ::= {
	* { OID id-mgf1 PARAMETERS HashAlgorithm },
	* ... -- Allows for future expansion --
	* }
	* PKCS1PSourceAlgorithms ALGORITHM-IDENTIFIER ::= {
	* { OID id-pSpecified PARAMETERS EncodingParameters },
	* ... -- Allows for future expansion --
	* }
	* EncodingParameters ::= OCTET STRING(SIZE(0..MAX))
	* </pre>
	* <p>Note: the OAEPParameterSpec.DEFAULT uses the following:
	* <pre>
	* message digest -- "SHA-1"
	* mask generation function (mgf) -- "MGF1"
	* parameters for mgf -- MGF1ParameterSpec.SHA1
	* source of encoding input -- PSource.PSpecified.DEFAULT
	* </pre>
	*
	* @see java.security.spec.MGF1ParameterSpec
	* @see PSource
	*
	* @author Valerie Peng
	*
	* @since 1.5
	*/
	public class OAEPParameterSpec implements AlgorithmParameterSpec {

	private String mdName = "SHA-1";
	private String mgfName = "MGF1";
	private AlgorithmParameterSpec mgfSpec = MGF1ParameterSpec.SHA1;
	private PSource pSrc = PSource.PSpecified.DEFAULT;

	/**
	* The OAEP parameter set with all default values.
	*/
	public static final OAEPParameterSpec DEFAULT = new OAEPParameterSpec();

	/**
	* Constructs a parameter set for OAEP padding as defined in
	* the PKCS #1 standard using the default values.
	*/
	private OAEPParameterSpec() {
	}

	/**
	* Constructs a parameter set for OAEP padding as defined in
	* the PKCS #1 standard using the specified message digest
	* algorithm <code>mdName</code>, mask generation function
	* algorithm <code>mgfName</code>, parameters for the mask
	* generation function <code>mgfSpec</code>, and source of
	* the encoding input P <code>pSrc</code>.
	*
	* @param mdName the algorithm name for the message digest.
	* @param mgfName the algorithm name for the mask generation
	* function.
	* @param mgfSpec the parameters for the mask generation function.
	* If null is specified, null will be returned by getMGFParameters().
	* @param pSrc the source of the encoding input P.
	* @exception NullPointerException if <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("digest algorithm is null");
	}
	if (mgfName == null) {
	throw new NullPointerException("mask generation function " +
	"algorithm is null");
	}
	if (pSrc == null) {
	throw new NullPointerException("source of the encoding input " +
	"is null");
	}
	this.mdName = mdName;
	this.mgfName = mgfName;
	this.mgfSpec = mgfSpec;
	this.pSrc = pSrc;
	}

	/**
	* Returns the message digest algorithm name.
	*
	* @return the message digest algorithm name.
	*/
	public String getDigestAlgorithm() {
	return mdName;
	}

	/**
	* Returns the mask generation function algorithm name.
	*
	* @return the mask generation function algorithm name.
	*/
	public String getMGFAlgorithm() {
	return mgfName;
	}

	/**
	* Returns the parameters for the mask generation function.
	*
	* @return the parameters for the mask generation function.
	*/
	public AlgorithmParameterSpec getMGFParameters() {
	return mgfSpec;
	}

	/**
	* Returns the source of encoding input P.
	*
	* @return the source of encoding input P.
	*/
	public PSource getPSource() {
	return pSrc;
	}
	}

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