org.xwiki.crypto.internal.asymmetric.BcPublicKeyParameters Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of xwiki-commons-crypto-common Show documentation
API common to all crypto modules
There is a newer version: 17.0.0-rc-1
Show newest version
/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.xwiki.crypto.internal.asymmetric;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.RSAPublicKey;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.DSAParameters;
import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.util.SubjectPublicKeyInfoFactory;
import org.xwiki.crypto.params.cipher.asymmetric.PublicKeyParameters;

/**
 * Encapsulate a Bouncy Castle asymmetric parameter of a public key.
 *
 * @version $Id: 44e9cef4a61d9aa982877eda1422097d2052463d $
 * @since 5.4M1
 */
public class BcPublicKeyParameters extends AbstractBcAsymmetricKeyParameters implements PublicKeyParameters
{
    /**
     * Encapsulate a given Bouncy Castle public key parameter.
     *
     * @param parameters a BC public key parameter.
     */
    public BcPublicKeyParameters(AsymmetricKeyParameter parameters)
    {
        super(parameters);
        if (isPrivate()) {
            throw new IllegalArgumentException("Private key assigned to a public key: "
                + parameters.getClass().getName());
        }
    }

    /**
     * @return parameters converted to BC subject public key info structure.
     * @throws IOException on error.
     */
    public SubjectPublicKeyInfo getSubjectPublicKeyInfo() throws IOException
    {
        if (this.parameters instanceof RSAKeyParameters) {
            RSAKeyParameters params = (RSAKeyParameters) this.parameters;

            return new SubjectPublicKeyInfo(
                new AlgorithmIdentifier(PKCSObjectIdentifiers.rsaEncryption, DERNull.INSTANCE),
                new RSAPublicKey(params.getModulus(), params.getExponent()));
        } else if (this.parameters instanceof DSAPublicKeyParameters) {
            DSAPublicKeyParameters params = (DSAPublicKeyParameters) this.parameters;
            DSAParameters dsaParams = params.getParameters();
            DSAParameter algParams = null;

            if (dsaParams != null) {
                algParams = new DSAParameter(dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());
            }

            return new SubjectPublicKeyInfo(
                new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, algParams),
                new ASN1Integer(params.getY()));
        } else {
            // Fallback to Bouncy Castle, not sure it will do anything useful however.
            return SubjectPublicKeyInfoFactory.createSubjectPublicKeyInfo(this.parameters);
        }
    }

    @Override
    public byte[] getEncoded()
    {
        try {
            return getSubjectPublicKeyInfo().getEncoded();
        } catch (IOException e) {
            return null;
        }
    }
}