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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 sun.security.pkcs11;

	import java.math.BigInteger;

	import java.security.*;
	import java.security.interfaces.*;
	import java.security.spec.*;

	import static sun.security.pkcs11.TemplateManager.*;
	import sun.security.pkcs11.wrapper.*;
	import static sun.security.pkcs11.wrapper.PKCS11Constants.*;

	/**
	* DSA KeyFactory implementation.
	*
	* @author Andreas Sterbenz
	* @since 1.5
	*/
	final class P11DSAKeyFactory extends P11KeyFactory {

	P11DSAKeyFactory(Token token, String algorithm) {
	super(token, algorithm);
	}

	PublicKey implTranslatePublicKey(PublicKey key) throws InvalidKeyException {
	try {
	if (key instanceof DSAPublicKey) {
	DSAPublicKey dsaKey = (DSAPublicKey)key;
	DSAParams params = dsaKey.getParams();
	return generatePublic(
	dsaKey.getY(),
	params.getP(),
	params.getQ(),
	params.getG()
	);
	} else if ("X.509".equals(key.getFormat())) {
	// let Sun provider parse for us, then recurse
	byte[] encoded = key.getEncoded();
	key = new sun.security.provider.DSAPublicKey(encoded);
	return implTranslatePublicKey(key);
	} else {
	throw new InvalidKeyException("PublicKey must be instance "
	+ "of DSAPublicKey or have X.509 encoding");
	}
	} catch (PKCS11Exception e) {
	throw new InvalidKeyException("Could not create DSA public key", e);
	}
	}

	PrivateKey implTranslatePrivateKey(PrivateKey key)
	throws InvalidKeyException {
	try {
	if (key instanceof DSAPrivateKey) {
	DSAPrivateKey dsaKey = (DSAPrivateKey)key;
	DSAParams params = dsaKey.getParams();
	return generatePrivate(
	dsaKey.getX(),
	params.getP(),
	params.getQ(),
	params.getG()
	);
	} else if ("PKCS#8".equals(key.getFormat())) {
	// let Sun provider parse for us, then recurse
	byte[] encoded = key.getEncoded();
	key = new sun.security.provider.DSAPrivateKey(encoded);
	return implTranslatePrivateKey(key);
	} else {
	throw new InvalidKeyException("PrivateKey must be instance "
	+ "of DSAPrivateKey or have PKCS#8 encoding");
	}
	} catch (PKCS11Exception e) {
	throw new InvalidKeyException("Could not create DSA private key", e);
	}
	}

	// see JCA spec
	protected PublicKey engineGeneratePublic(KeySpec keySpec)
	throws InvalidKeySpecException {
	token.ensureValid();
	if (keySpec instanceof X509EncodedKeySpec) {
	try {
	byte[] encoded = ((X509EncodedKeySpec)keySpec).getEncoded();
	PublicKey key = new sun.security.provider.DSAPublicKey(encoded);
	return implTranslatePublicKey(key);
	} catch (InvalidKeyException e) {
	throw new InvalidKeySpecException
	("Could not create DSA public key", e);
	}
	}
	if (keySpec instanceof DSAPublicKeySpec == false) {
	throw new InvalidKeySpecException("Only DSAPublicKeySpec and "
	+ "X509EncodedKeySpec supported for DSA public keys");
	}
	try {
	DSAPublicKeySpec ds = (DSAPublicKeySpec)keySpec;
	return generatePublic(
	ds.getY(),
	ds.getP(),
	ds.getQ(),
	ds.getG()
	);
	} catch (PKCS11Exception e) {
	throw new InvalidKeySpecException
	("Could not create DSA public key", e);
	}
	}

	// see JCA spec
	protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
	throws InvalidKeySpecException {
	token.ensureValid();
	if (keySpec instanceof PKCS8EncodedKeySpec) {
	try {
	byte[] encoded = ((PKCS8EncodedKeySpec)keySpec).getEncoded();
	PrivateKey key = new sun.security.provider.DSAPrivateKey(encoded);
	return implTranslatePrivateKey(key);
	} catch (GeneralSecurityException e) {
	throw new InvalidKeySpecException
	("Could not create DSA private key", e);
	}
	}
	if (keySpec instanceof DSAPrivateKeySpec == false) {
	throw new InvalidKeySpecException("Only DSAPrivateKeySpec and "
	+ "PKCS8EncodedKeySpec supported for DSA private keys");
	}
	try {
	DSAPrivateKeySpec ds = (DSAPrivateKeySpec)keySpec;
	return generatePrivate(
	ds.getX(),
	ds.getP(),
	ds.getQ(),
	ds.getG()
	);
	} catch (PKCS11Exception e) {
	throw new InvalidKeySpecException
	("Could not create DSA private key", e);
	}
	}

	private PublicKey generatePublic(BigInteger y, BigInteger p, BigInteger q,
	BigInteger g) throws PKCS11Exception {
	CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {
	new CK_ATTRIBUTE(CKA_CLASS, CKO_PUBLIC_KEY),
	new CK_ATTRIBUTE(CKA_KEY_TYPE, CKK_DSA),
	new CK_ATTRIBUTE(CKA_VALUE, y),
	new CK_ATTRIBUTE(CKA_PRIME, p),
	new CK_ATTRIBUTE(CKA_SUBPRIME, q),
	new CK_ATTRIBUTE(CKA_BASE, g),
	};
	attributes = token.getAttributes
	(O_IMPORT, CKO_PUBLIC_KEY, CKK_DSA, attributes);
	Session session = null;
	try {
	session = token.getObjSession();
	long keyID = token.p11.C_CreateObject(session.id(), attributes);
	return P11Key.publicKey
	(session, keyID, "DSA", p.bitLength(), attributes);
	} finally {
	token.releaseSession(session);
	}
	}

	private PrivateKey generatePrivate(BigInteger x, BigInteger p,
	BigInteger q, BigInteger g) throws PKCS11Exception {
	CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {
	new CK_ATTRIBUTE(CKA_CLASS, CKO_PRIVATE_KEY),
	new CK_ATTRIBUTE(CKA_KEY_TYPE, CKK_DSA),
	new CK_ATTRIBUTE(CKA_VALUE, x),
	new CK_ATTRIBUTE(CKA_PRIME, p),
	new CK_ATTRIBUTE(CKA_SUBPRIME, q),
	new CK_ATTRIBUTE(CKA_BASE, g),
	};
	attributes = token.getAttributes
	(O_IMPORT, CKO_PRIVATE_KEY, CKK_DSA, attributes);
	Session session = null;
	try {
	session = token.getObjSession();
	long keyID = token.p11.C_CreateObject(session.id(), attributes);
	return P11Key.privateKey
	(session, keyID, "DSA", p.bitLength(), attributes);
	} finally {
	token.releaseSession(session);
	}
	}

	<T extends KeySpec> T implGetPublicKeySpec(P11Key key, Class<T> keySpec,
	Session[] session) throws PKCS11Exception, InvalidKeySpecException {
	if (DSAPublicKeySpec.class.isAssignableFrom(keySpec)) {
	session[0] = token.getObjSession();
	CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {
	new CK_ATTRIBUTE(CKA_VALUE),
	new CK_ATTRIBUTE(CKA_PRIME),
	new CK_ATTRIBUTE(CKA_SUBPRIME),
	new CK_ATTRIBUTE(CKA_BASE),
	};
	long keyID = key.getKeyID();
	try {
	token.p11.C_GetAttributeValue(session[0].id(), keyID, attributes);
	} finally {
	key.releaseKeyID();
	}
	KeySpec spec = new DSAPublicKeySpec(
	attributes[0].getBigInteger(),
	attributes[1].getBigInteger(),
	attributes[2].getBigInteger(),
	attributes[3].getBigInteger()
	);
	return keySpec.cast(spec);
	} else { // X.509 handled in superclass
	throw new InvalidKeySpecException("Only DSAPublicKeySpec and "
	+ "X509EncodedKeySpec supported for DSA public keys");
	}
	}

	<T extends KeySpec> T implGetPrivateKeySpec(P11Key key, Class<T> keySpec,
	Session[] session) throws PKCS11Exception, InvalidKeySpecException {
	if (DSAPrivateKeySpec.class.isAssignableFrom(keySpec)) {
	session[0] = token.getObjSession();
	CK_ATTRIBUTE[] attributes = new CK_ATTRIBUTE[] {
	new CK_ATTRIBUTE(CKA_VALUE),
	new CK_ATTRIBUTE(CKA_PRIME),
	new CK_ATTRIBUTE(CKA_SUBPRIME),
	new CK_ATTRIBUTE(CKA_BASE),
	};
	long keyID = key.getKeyID();
	try {
	token.p11.C_GetAttributeValue(session[0].id(), keyID, attributes);
	} finally {
	key.releaseKeyID();
	}
	KeySpec spec = new DSAPrivateKeySpec(
	attributes[0].getBigInteger(),
	attributes[1].getBigInteger(),
	attributes[2].getBigInteger(),
	attributes[3].getBigInteger()
	);
	return keySpec.cast(spec);
	} else { // PKCS#8 handled in superclass
	throw new InvalidKeySpecException("Only DSAPrivateKeySpec "
	+ "and PKCS8EncodedKeySpec supported for DSA private keys");
	}
	}

	KeyFactory implGetSoftwareFactory() throws GeneralSecurityException {
	return KeyFactory.getInstance("DSA", P11Util.getSunProvider());
	}

	}

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