com.github.ibole.infrastructure.security.ECDSA.java Source code

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Here is the source code for com.github.ibole.infrastructure.security.ECDSA.java

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/*
 * Copyright 2016-2017 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 * 
 * 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.github.ibole.infrastructure.security;

import com.github.ibole.infrastructure.common.utils.HexUtil;

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

import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/*********************************************************************************************
 * .
 * 
 * 
 * <p>
 * Copyright 2016, iBole Inc. All rights reserved.
 * 
 * <p>
 * </p>
 *********************************************************************************************/

/**
 * @author bwang
 *
 */
public class ECDSA {

    private static String src = "ecdsa security";

    public static void main(String[] args) {
        jdkECDSA();
    }

    public static void jdkECDSA() {
        try {
            // 1.?
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("EC");
            keyPairGenerator.initialize(256);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            ECPublicKey ecPublicKey = (ECPublicKey) keyPair.getPublic();
            ECPrivateKey ecPrivateKey = (ECPrivateKey) keyPair.getPrivate();

            // 2.??
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(ecPrivateKey.getEncoded());

            KeyFactory keyFactory = KeyFactory.getInstance("EC");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature = Signature.getInstance("SHA256withECDSA");
            signature.initSign(privateKey);
            signature.update(src.getBytes());
            byte[] res = signature.sign();
            System.out.println("??" + Base64.encodeBase64String(res));

            // 3.???
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(ecPublicKey.getEncoded());
            keyFactory = KeyFactory.getInstance("EC");
            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
            signature = Signature.getInstance("SHA256withECDSA");
            signature.initVerify(publicKey);
            signature.update(src.getBytes());
            boolean bool = signature.verify(res);
            System.out.println("?" + bool);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}