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/*
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* Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.pkcs11;
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import java.math.BigInteger;
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import java.security.*;
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import java.security.spec.*;
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import javax.crypto.spec.DHParameterSpec;
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import sun.security.provider.ParameterCache;
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import static sun.security.pkcs11.TemplateManager.*;
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import sun.security.pkcs11.wrapper.*;
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import static sun.security.pkcs11.wrapper.PKCS11Constants.*;
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import sun.security.rsa.RSAKeyFactory;
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/**
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* KeyPairGenerator implementation class. This class currently supports
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* RSA, DSA, DH, and EC.
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*
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* Note that for DSA and DH we rely on the Sun and SunJCE providers to
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* obtain the parameters from.
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*
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* @author Andreas Sterbenz
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* @since 1.5
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*/
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final class P11KeyPairGenerator extends KeyPairGeneratorSpi {
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// token instance
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private final Token token;
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// algorithm name
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private final String algorithm;
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// mechanism id
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private final long mechanism;
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// selected or default key size, always valid
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private int keySize;
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// parameters specified via init, if any
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private AlgorithmParameterSpec params;
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// for RSA, selected or default value of public exponent, always valid
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private BigInteger rsaPublicExponent = RSAKeyGenParameterSpec.F4;
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// SecureRandom instance, if specified in init
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private SecureRandom random;
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P11KeyPairGenerator(Token token, String algorithm, long mechanism)
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throws PKCS11Exception {
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super();
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this.token = token;
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this.algorithm = algorithm;
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this.mechanism = mechanism;
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if (algorithm.equals("EC")) {
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initialize(256, null);
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} else {
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initialize(1024, null);
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}
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}
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// see JCA spec
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public void initialize(int keySize, SecureRandom random) {
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token.ensureValid();
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try {
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checkKeySize(keySize, null);
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} catch (InvalidAlgorithmParameterException e) {
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throw new InvalidParameterException(e.getMessage());
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}
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this.keySize = keySize;
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this.params = null;
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this.random = random;
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if (algorithm.equals("EC")) {
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params = P11ECKeyFactory.getECParameterSpec(keySize);
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if (params == null) {
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throw new InvalidParameterException(
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"No EC parameters available for key size "
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+ keySize + " bits");
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}
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}
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}
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// see JCA spec
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public void initialize(AlgorithmParameterSpec params, SecureRandom random)
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throws InvalidAlgorithmParameterException {
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token.ensureValid();
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if (algorithm.equals("DH")) {
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if (params instanceof DHParameterSpec == false) {
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throw new InvalidAlgorithmParameterException
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("DHParameterSpec required for Diffie-Hellman");
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}
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DHParameterSpec dhParams = (DHParameterSpec)params;
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int tmpKeySize = dhParams.getP().bitLength();
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checkKeySize(tmpKeySize, dhParams);
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this.keySize = tmpKeySize;
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this.params = dhParams;
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// XXX sanity check params
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} else if (algorithm.equals("RSA")) {
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if (params instanceof RSAKeyGenParameterSpec == false) {
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throw new InvalidAlgorithmParameterException
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("RSAKeyGenParameterSpec required for RSA");
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}
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RSAKeyGenParameterSpec rsaParams = (RSAKeyGenParameterSpec)params;
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int tmpKeySize = rsaParams.getKeysize();
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checkKeySize(tmpKeySize, rsaParams);
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this.keySize = tmpKeySize;
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this.params = null;
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this.rsaPublicExponent = rsaParams.getPublicExponent();
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// XXX sanity check params
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} else if (algorithm.equals("DSA")) {
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if (params instanceof DSAParameterSpec == false) {
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throw new InvalidAlgorithmParameterException
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("DSAParameterSpec required for DSA");
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}
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DSAParameterSpec dsaParams = (DSAParameterSpec)params;
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int tmpKeySize = dsaParams.getP().bitLength();
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checkKeySize(tmpKeySize, dsaParams);
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this.keySize = tmpKeySize;
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this.params = dsaParams;
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// XXX sanity check params
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} else if (algorithm.equals("EC")) {
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ECParameterSpec ecParams;
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if (params instanceof ECParameterSpec) {
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ecParams = P11ECKeyFactory.getECParameterSpec(
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(ECParameterSpec)params);
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if (ecParams == null) {
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throw new InvalidAlgorithmParameterException
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("Unsupported curve: " + params);
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}
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} else if (params instanceof ECGenParameterSpec) {
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String name = ((ECGenParameterSpec)params).getName();
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ecParams = P11ECKeyFactory.getECParameterSpec(name);
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if (ecParams == null) {
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throw new InvalidAlgorithmParameterException
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("Unknown curve name: " + name);
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}
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} else {
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throw new InvalidAlgorithmParameterException
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("ECParameterSpec or ECGenParameterSpec required for EC");
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}
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int tmpKeySize = ecParams.getCurve().getField().getFieldSize();
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checkKeySize(tmpKeySize, ecParams);
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this.keySize = tmpKeySize;
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this.params = ecParams;
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} else {
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throw new ProviderException("Unknown algorithm: " + algorithm);
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}
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this.random = random;
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}
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private void checkKeySize(int keySize, AlgorithmParameterSpec params)
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throws InvalidAlgorithmParameterException {
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if (algorithm.equals("EC")) {
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if (keySize < 112) {
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throw new InvalidAlgorithmParameterException
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("Key size must be at least 112 bit");
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}
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if (keySize > 2048) {
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// sanity check, nobody really wants keys this large
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throw new InvalidAlgorithmParameterException
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("Key size must be at most 2048 bit");
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}
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return;
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} else if (algorithm.equals("RSA")) {
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BigInteger tmpExponent = rsaPublicExponent;
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if (params != null) {
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// Already tested for instanceof RSAKeyGenParameterSpec above
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tmpExponent =
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((RSAKeyGenParameterSpec)params).getPublicExponent();
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}
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try {
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// This provider supports 64K or less.
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RSAKeyFactory.checkKeyLengths(keySize, tmpExponent,
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512, 64 * 1024);
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} catch (InvalidKeyException e) {
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throw new InvalidAlgorithmParameterException(e.getMessage());
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}
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return;
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}
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if (keySize < 512) {
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throw new InvalidAlgorithmParameterException
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("Key size must be at least 512 bit");
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}
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if (algorithm.equals("DH") && (params != null)) {
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// sanity check, nobody really wants keys this large
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if (keySize > 64 * 1024) {
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throw new InvalidAlgorithmParameterException
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("Key size must be at most 65536 bit");
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}
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} else {
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// this restriction is in the spec for DSA
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// since we currently use DSA parameters for DH as well,
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// it also applies to DH if no parameters are specified
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if ((keySize > 1024) || ((keySize & 0x3f) != 0)) {
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throw new InvalidAlgorithmParameterException
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("Key size must be a multiple of 64 and at most 1024 bit");
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}
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}
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}
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// see JCA spec
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public KeyPair generateKeyPair() {
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token.ensureValid();
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CK_ATTRIBUTE[] publicKeyTemplate;
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CK_ATTRIBUTE[] privateKeyTemplate;
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long keyType;
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if (algorithm.equals("RSA")) {
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keyType = CKK_RSA;
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publicKeyTemplate = new CK_ATTRIBUTE[] {
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new CK_ATTRIBUTE(CKA_MODULUS_BITS, keySize),
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new CK_ATTRIBUTE(CKA_PUBLIC_EXPONENT, rsaPublicExponent),
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};
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privateKeyTemplate = new CK_ATTRIBUTE[] {
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// empty
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};
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} else if (algorithm.equals("DSA")) {
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keyType = CKK_DSA;
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DSAParameterSpec dsaParams;
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if (params == null) {
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try {
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dsaParams = ParameterCache.getDSAParameterSpec
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(keySize, random);
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} catch (GeneralSecurityException e) {
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throw new ProviderException
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("Could not generate DSA parameters", e);
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}
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} else {
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dsaParams = (DSAParameterSpec)params;
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}
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publicKeyTemplate = new CK_ATTRIBUTE[] {
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new CK_ATTRIBUTE(CKA_PRIME, dsaParams.getP()),
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new CK_ATTRIBUTE(CKA_SUBPRIME, dsaParams.getQ()),
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new CK_ATTRIBUTE(CKA_BASE, dsaParams.getG()),
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};
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privateKeyTemplate = new CK_ATTRIBUTE[] {
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// empty
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};
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} else if (algorithm.equals("DH")) {
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keyType = CKK_DH;
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DHParameterSpec dhParams;
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int privateBits;
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if (params == null) {
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try {
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dhParams = ParameterCache.getDHParameterSpec
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(keySize, random);
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} catch (GeneralSecurityException e) {
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throw new ProviderException
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("Could not generate DH parameters", e);
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}
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privateBits = 0;
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} else {
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dhParams = (DHParameterSpec)params;
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privateBits = dhParams.getL();
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}
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if (privateBits <= 0) {
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// XXX find better defaults
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privateBits = (keySize >= 1024) ? 768 : 512;
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}
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publicKeyTemplate = new CK_ATTRIBUTE[] {
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new CK_ATTRIBUTE(CKA_PRIME, dhParams.getP()),
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new CK_ATTRIBUTE(CKA_BASE, dhParams.getG())
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};
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privateKeyTemplate = new CK_ATTRIBUTE[] {
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new CK_ATTRIBUTE(CKA_VALUE_BITS, privateBits),
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};
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} else if (algorithm.equals("EC")) {
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keyType = CKK_EC;
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byte[] encodedParams =
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P11ECKeyFactory.encodeParameters((ECParameterSpec)params);
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publicKeyTemplate = new CK_ATTRIBUTE[] {
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new CK_ATTRIBUTE(CKA_EC_PARAMS, encodedParams),
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};
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privateKeyTemplate = new CK_ATTRIBUTE[] {
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// empty
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};
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} else {
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throw new ProviderException("Unknown algorithm: " + algorithm);
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}
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Session session = null;
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try {
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session = token.getObjSession();
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publicKeyTemplate = token.getAttributes
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(O_GENERATE, CKO_PUBLIC_KEY, keyType, publicKeyTemplate);
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privateKeyTemplate = token.getAttributes
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(O_GENERATE, CKO_PRIVATE_KEY, keyType, privateKeyTemplate);
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long[] keyIDs = token.p11.C_GenerateKeyPair
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(session.id(), new CK_MECHANISM(mechanism),
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publicKeyTemplate, privateKeyTemplate);
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PublicKey publicKey = P11Key.publicKey
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(session, keyIDs[0], algorithm, keySize, publicKeyTemplate);
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PrivateKey privateKey = P11Key.privateKey
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(session, keyIDs[1], algorithm, keySize, privateKeyTemplate);
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return new KeyPair(publicKey, privateKey);
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} catch (PKCS11Exception e) {
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throw new ProviderException(e);
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} finally {
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token.releaseSession(session);
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}
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}
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}
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