个回答

• 恶汉模式

  2016-07-24 23:57:25

  package com.dhs.test;

  
  

  import java.security.KeyFactory;

  import java.security.KeyPair;

  import java.security.KeyPairGenerator;

  import java.security.NoSuchAlgorithmException;

  import java.security.PrivateKey;

  import java.security.PublicKey;

  import java.security.Signature;

  import java.security.interfaces.RSAPrivateKey;

  import java.security.interfaces.RSAPublicKey;

  import java.security.spec.PKCS8EncodedKeySpec;

  import java.security.spec.X509EncodedKeySpec;

  import org.bouncycastle.util.encoders.Hex;

  
  

  public class RSATest {

  public static final String SRC_STRING = "fdsfsfsfsfd";

  public static void main(String[] args) {

  try {

  KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");

  keyPairGenerator.initialize(512);

  KeyPair keyPair = keyPairGenerator.generateKeyPair();

  RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();// 私钥

  RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();// 公钥

  String sign = jdkRSASign(rsaPrivateKey, SRC_STRING);

  System.out.println("sign:"+sign);

  boolean bool = jdkRSACheck(rsaPublicKey, SRC_STRING, sign);

  System.out.println(bool);

  } catch (NoSuchAlgorithmException e) {

  // TODO Auto-generated catch block

  e.printStackTrace();

  }

  }

  // 签名方法

  public static String jdkRSASign(RSAPrivateKey rsaPrivateKey, String src) {

  String result = null;// 签名结果

  try {

  // 2.执行签名

  PKCS8EncodedKeySpec pkcS8EncodedKeySpec = new PKCS8EncodedKeySpec(

  rsaPrivateKey.getEncoded());

  KeyFactory keyFactory = KeyFactory.getInstance("RSA");

  PrivateKey privateKey = keyFactory

  .generatePrivate(pkcS8EncodedKeySpec);

  Signature signature = Signature.getInstance("MD5withRSA");

  signature.initSign(privateKey);

  signature.update(src.getBytes("UTF-8"));

  result = Hex.toHexString(signature.sign());

  } catch (Exception e) {

  e.printStackTrace();

  }

  
  

  return result;

  }

  
  

  // 验签名方法

  public static boolean jdkRSACheck(RSAPublicKey rsaPublicKey, String src, String sign) {

  boolean result = false;

  try {

  // 2.验证签名

  X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(

  rsaPublicKey.getEncoded());

  KeyFactory keyFactory = KeyFactory.getInstance("RSA");

  PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);

  Signature signature = Signature.getInstance("MD5withRSA");

  signature.initVerify(publicKey);

  signature.update(src.getBytes("UTF-8"));

  result = signature.verify(Hex.decode(sign));

  } catch (Exception e) {

  e.printStackTrace();

  }

  
  

  return result;

  }

  }

  
  

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