keytest.java

密码学中MD5算法的JAVA实现 密码学中MD5算法的JAVA实现

package test;

import java.security.Security;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;

/**
 * <p>Title: 网络信息安全统一管理中心</p>
 *
 * <p>Description: 中心端业务及页面程序:</p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: 深圳市艾默特有限责任公司 corp. AMT</p>
 *
 * @author 凌微丰
 * @version 1.0
 */
public class KeyTest {
    public KeyTest() {
            //添加新安全算法,如果用JCE就要把它添加进去
    Security.addProvider(new com.sun.crypto.provider.SunJCE());
    }
  /**
   * 算法
   */
  private static final String Algorithm = "DESede";
  /**
   * 24字节的密钥
   */
  private static final byte[] keyBytes = {
      0x13, 0x23, 0x3F, 0x58, (byte) 0x87, 0x11, 0x41, 0x37
      , 0x28, 0x25, 0x79, 0x51, (byte) 0xCB, (byte) 0xDD, 0x53, 0x67
      , 0x77, 0x29, 0x71, (byte) 0x97, 0x37, 0x43, 0x31, (byte) 0xE1};

  /**
   * 加密过程
   * @param keybyte byte[]
   * @param src byte[]
   * @return byte[]
   */
  private static byte[] encryptMode(byte[] keybyte, byte[] src) {
    try {
      //生成密钥
      SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
      //加密
      Cipher c1 = Cipher.getInstance(Algorithm);
      c1.init(Cipher.ENCRYPT_MODE, deskey);
      return c1.doFinal(src);
    }
    catch (java.security.NoSuchAlgorithmException e1) {
      e1.printStackTrace();
    }
    catch (javax.crypto.NoSuchPaddingException e2) {
      e2.printStackTrace();
    }
    catch (java.lang.Exception e3) {
      e3.printStackTrace();
    }
    return null;
  }

  /**
   * 解密过程
   * @param keybyte byte[]
   * @param src byte[]
   * @return byte[]
   */
  private static byte[] decryptMode(byte[] keybyte, byte[] src) {
    try {
      //生成密钥
      SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);
      //解密
      Cipher c1 = Cipher.getInstance(Algorithm);
      c1.init(Cipher.DECRYPT_MODE, deskey);
      return c1.doFinal(src);
    }
    catch (java.security.NoSuchAlgorithmException e1) {
      e1.printStackTrace();
    }
    catch (javax.crypto.NoSuchPaddingException e2) {
      e2.printStackTrace();
    }
    catch (java.lang.Exception e3) {
      e3.printStackTrace();
    }
    return null;
  }

  /**
   * 这是供用户调用的接口
   * 输入要加密的字符串，输出加密后的字符串
   * @param info String
   * @return String
   */
  public static String encrypt(String info) {
    String res = null;
    byte[] tem = null;
    try {
      tem = encryptMode(keyBytes, info.getBytes());
      res = new String(tem, "iso-8859-1");
    }
    catch (Exception e) {
      e.printStackTrace();
    }

    return res;
  }

  /**
   * 这是供用户调用的接口
   * 输入要解密的字符串，输出解密后的字符串
   * @param info String
   * @return String
   */
  public static String decrypt(String info) {
    String res = null;
    byte[] tem = null;
    try {
      tem = decryptMode(keyBytes, info.getBytes("iso-8859-1"));
    }
    catch (Exception e) {
      e.printStackTrace();
    }
    res = new String(tem);
    return res;
  }
//  public static void main(String args[]){
//     KeyTest keyTest=new KeyTest();
//     String theKey = "2357";
//     String key = keyTest.encrypt(theKey);
//      String theDK = keyTest.decrypt(key);
//      System.out.println("---------- "+key);
//      System.out.println("========== "+theDK);
//  }






}