java jca des 数字签名

java jca des 数字签名

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.Signature;

public class RsaTest {
 public static void main(String args[]) throws Exception {
  SecureRandom sr = new SecureRandom();
  KeyPairGenerator kg = KeyPairGenerator.getInstance("DSA");
  kg.initialize(512, sr);

  //产生新密钥对
  KeyPair kp = kg.generateKeyPair();
  //获得私匙
  PrivateKey prk = kp.getPrivate();
  //获得公钥
  PublicKey puk = kp.getPublic();
  //返回一个指定算法的Signature对象
  Signature signature = Signature.getInstance("DSA");
  signature.initSign(prk);
  String str = "你好吗?我在测试RSA测试^_^你好吗?我在测试RSA测试^_^你好吗?我在测试RSA测试^_^你好吗?我在测试RSA测试^_^";
  signature.update(str.getBytes());
  byte[] dest = signature.sign();
  System.out.println("Enc:"+new String(dest));
  
  Signature signature2 = Signature.getInstance("DSA");
  signature2.initVerify(puk);
  signature2.update(str.getBytes());
  System.out.println(signature2.verify(dest));
 }
}

</script>