Java数字签名算法DSA实例详解

2019-11-26 10:00:07

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本文实例讲述了Java数字签名算法DSA。分享给大家供大家参考，具体如下：

一、介绍

DSS：Digital Signature Standard 数字签名标准

DSA：Digital Signature Algorithm 数字签名算法

DSA仅包含数字签名

二、参数说明

三、代码实现

package com.imooc.security.dsa;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.DSAPrivateKey;import java.security.interfaces.DSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import org.apache.commons.codec.binary.Hex;public class ImoocDSA {  private static String src = "cakin24 security dsa";  public static void main(String[] args) {    jdkDSA();  }  public static void jdkDSA() {    try {      //1.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[] result = signature.sign();      System.out.println("jdk dsa sign : " + Hex.encodeHexString(result));      //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(result);      System.out.println("jdk dsa verify : " + bool);    } catch (Exception e) {      e.printStackTrace();    }  }}

四、实现效果