de.tsenger.animamea.ta.TerminalAuthentication.java Source code

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Here is the source code for de.tsenger.animamea.ta.TerminalAuthentication.java

Source

/**
 *  Copyright 2011, Tobias Senger
 *  
 *  This file is part of animamea.
 *
 *  Animamea is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Animamea 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 for more details.
 *
 *  You should have received a copy of the GNU General Public License   
 *  along with animamea.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.tsenger.animamea.ta;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.util.Random;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.jce.spec.ECParameterSpec;

import de.tsenger.animamea.asn1.DomainParameter;

/**
 * @author Tobias Senger (tobias@t-senger.de)
 *
 */
public abstract class TerminalAuthentication {

    private final SecureRandom randomGenerator = new SecureRandom();

    private DomainParameter caDP = null;

    public TerminalAuthentication(DomainParameter caDomainParameter) {
        this.caDP = caDomainParameter;
        Security.addProvider(new BouncyCastleProvider());
        Random rnd = new Random();
        randomGenerator.setSeed(rnd.nextLong());
    }

    public KeyPair getEphemeralPCDKeyPair() {
        ECParameterSpec ecSpec = caDP.getECParameter();
        KeyPairGenerator g = null;
        try {
            g = KeyPairGenerator.getInstance(caDP.getDPType(), "BC");
        } catch (NoSuchAlgorithmException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        try {
            g.initialize(ecSpec, new SecureRandom());
        } catch (InvalidAlgorithmParameterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        KeyPair pair = g.generateKeyPair();
        return pair;
    }

    /**
     * Signiert die bergebenen Daten 
     * @param dataToSign
     * @return
     */
    public abstract byte[] sign(byte[] dataToSign) throws TAException;

}