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Java数字签名算法DSA Java数字签名算法DSA实例详解

chengqiuming 人气:0

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

jdk dsa sign : 302c0214310539f9e19ec98167a687eb4e8f91e7f47326bf021428080b7f0ad2ccffc71466998d8d364ba516e840
jdk dsa verify : true

五、应用场景

PS:关于加密解密感兴趣的朋友还可以参考本站在线工具:

在线RSA加密/解密工具:
http://tools.softyun.net/password/rsa_encode

文字在线加密解密工具(包含AES、DES、RC4等):
http://tools.softyun.net/password/txt_encode

MD5在线加密工具:
http://tools.softyun.net/password/CreateMD5Password

在线散列/哈希算法加密工具:
http://tools.softyun.net/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具:
http://tools.softyun.net/password/hash_md5_sha

在线sha1/sha224/sha256/sha384/sha512加密工具:
http://tools.softyun.net/password/sha_encode

希望本文所述对大家java程序设计有所帮助。

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