com.aqnote.shared.cryptology.asymmetric.dsa.DSAKeyPairGenTest.java Source code

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Here is the source code for com.aqnote.shared.cryptology.asymmetric.dsa.DSAKeyPairGenTest.java

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/*
 * Copyright 2013-2023 "Peng Li"<aqnote@qq.com>
 * Licensed under the AQNote License, Version 1.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.aqnote.com/licenses/LICENSE-1.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.aqnote.shared.cryptology.asymmetric.dsa;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;

import org.apache.commons.codec.binary.Base64;

import com.aqnote.shared.cryptology.util.lang.StreamUtil;

/**
 * KeyPairGenerator.java?? DSA????
 * 
 * @author "Peng Li"<aqnote@qq.com> May 8, 2012 11:01:01 AM
 */
public class DSAKeyPairGenTest {

    public static final Long seed = System.currentTimeMillis();

    public static final String PRIKEY_FILE_NAME;

    public static final String PUBKEY_FILE_NAME;

    public static final String ALGORITHM = "DSA";

    static {
        PRIKEY_FILE_NAME = "/home/aqnote/" + "my_prikey.dat." + String.valueOf(seed);
        PUBKEY_FILE_NAME = "/home/aqnote/" + "my_pubkey.dat." + String.valueOf(seed);
    }

    public static void generator() throws NoSuchAlgorithmException, FileNotFoundException, IOException {
        KeyPairGenerator keygen = KeyPairGenerator.getInstance(ALGORITHM);

        // ???
        SecureRandom secrand = new SecureRandom();
        secrand.setSeed(seed); // ??
        // ??, ??keysize ?. 512  1024  64 ?
        keygen.initialize(512, secrand);
        // ?pubkey?prikey
        KeyPair keys = keygen.generateKeyPair(); // ?
        PublicKey pubkey = keys.getPublic();
        PrivateKey prikey = keys.getPrivate();

        byte[] pubkeyByteArray = Base64.encodeBase64(pubkey.getEncoded());
        OutputStream os = new FileOutputStream(new File(PUBKEY_FILE_NAME));
        ByteArrayInputStream bais = new ByteArrayInputStream(pubkeyByteArray);
        StreamUtil.io(bais, os);
        bais.close();
        os.close();

        byte[] prikeyByteArray = Base64.encodeBase64(prikey.getEncoded());
        os = new FileOutputStream(new File(PRIKEY_FILE_NAME));
        bais = new ByteArrayInputStream(prikeyByteArray);
        StreamUtil.io(bais, os);
        bais.close();
        os.close();
    }

}