数字签名算法DSA

最新推荐文章于 2025-02-21 07:00:00 发布

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最新推荐文章于 2025-02-21 07:00:00 发布

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本文链接：https://blog.youkuaiyun.com/durant_/article/details/78284446

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

import java.security.*;
import java.security.interfaces.DSAPrivateKey;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * Created by pengchao on 2017/10/19.
 */
public class IMoocDSA {
    private static String src ="imooc security dsa";
    public static void  main(String[] args) {
        jdkDSA();
    }
    public static void  jdkDSA(){
        try {
            //初始化密钥
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("DSA");
            keyPairGenerator.initialize(512);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            DSAPublicKey dsaPublicKey = (DSAPublicKey) keyPair.getPublic();
            DSAPrivateKey dsaPrivateKey = (DSAPrivateKey) keyPair.getPrivate();

            //2.执行签名
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(dsaPrivateKey.getEncoded());
            KeyFactory keyFactory = KeyFactory.getInstance("DSA");
            PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature = Signature.getInstance("SHA1withDSA");
            signature.initSign(privateKey);
            signature.update(src.getBytes());
            byte[] bytes = signature.sign();
            System.out.println("jdk dsa sign:" + Hex.encodeHexString(bytes));

            //3.验证签名
            X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(dsaPublicKey.getEncoded());
            keyFactory = KeyFactory.getInstance("DSA");
            PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
            signature = Signature.getInstance("SHA1withDSA");
            signature.initVerify(publicKey);
            signature.update(src.getBytes());
            boolean bool = signature.verify(bytes);
            System.out.println("jdk dsa verify :" + bool);
        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}