Java数字签名算法DSA实例详解

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

Java数字签名算法DSA实例详解

三、代码实现

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									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();

									    }

									  }

									}