Java中3DES的加密与解密

3DES加密与解密的Java实现

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.spec.SecretKeySpec;

/**  * 3DES工具类  */

public class DESUtils {

 /**

  * 加密

  * @param inStr 需要加密的内容

  * @param secretKey 密钥

  * @return 加密后的数据

  */

 public static String encrypt(String inStr, String secretKey) {

  SecretKey deskey = new SecretKeySpec(secretKey.getBytes(), "DESede");

  Cipher cipher;

  String outStr = null;

  try {

   cipher = Cipher.getInstance("DESede");

   cipher.init(Cipher.ENCRYPT_MODE, deskey);

   outStr = byte2hex(cipher.doFinal(inStr.getBytes()));

  } catch (Exception e) {

   outStr = "default";

   e.printStackTrace();

   }

  return outStr;

 }

 /**

  * 解密

  * @param inStr 需要解密的内容

  * @param secretKey 密钥

  * @return 解密后的数据

  */

 public static String decrypt(String inStr, String secretKey)

{

  SecretKey deskey = new SecretKeySpec(secretKey.getBytes(), "DESede");

  Cipher cipher;   String outStr = null;

  try {

   cipher = Cipher.getInstance("DESede");

   cipher.init(Cipher.DECRYPT_MODE, deskey);

   outStr = new String(cipher.doFinal(hex2byte(inStr)));

  } catch (Exception e) {

   outStr = "default";

   e.printStackTrace();

  }

  return outStr;

 }

 /**

  * 转化为16进制字符串方法

  *

  * @param digest 需要转换的字节组

  * @return 转换后的字符串

  */

 private static String byte2hex(byte[] digest) {

  StringBuffer hs = new StringBuffer();

  String stmp = "";

  for (int n = 0; n < digest.length; n++) {

   stmp = Integer.toHexString(digest[n] & 0XFF);

   if (stmp.length() == 1) {

    hs.append("0" + stmp);

   } else {

    hs.append(stmp);

   }

  }

  return hs.toString().toUpperCase();

 }

 /**

  * 十六进转二进制

  * @param hexStr 待转换16进制字符串

  * @return 二进制字节组

  */

  public static byte[] hex2byte(String hexStr){

  if (hexStr == null)

   return null;

  hexStr = hexStr.trim();

  int len = hexStr.length();

  if (len == 0 || len % 2 == 1)

   return null;

  byte[] digest = new byte[len / 2];

  try {

   for (int i = 0; i < hexStr.length(); i += 2) {

    digest[i / 2] = (byte) Integer.decode("0x" + hexStr.substring(i, i + 2)).intValue();

   }    return digest;

  } catch (Exception e) {

   return null;

  }

 }

}