IDEA安全编码组件

import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.Security;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;

import com.jfinal.kit.PropKit;
import com.jfinal.log.Log;

/**
 * IDEA安全编码组件
 * 
 * 国际数据加密标准---IDEA：完全是新突破，几乎同时和AES出现
 */
public abstract class ToolIDEA {

   private static final Log log = Log.getLog(ToolIDEA.class);

   /**
    * 密钥算法
    */
   public static final String KEY_ALGORITHM = "IDEA";

   /**
    * 加密/解密算法 / 工作模式 / 填充方式
    */
   public static final String CIPHER_ALGORITHM = "IDEA/ECB/PKCS5Padding";

   static {
      // 加入BouncyCastleProvider支持
      Security.addProvider(new BouncyCastleProvider());
   }

   /**
    * 转换密钥
    * 
    * @param key
    *            二进制密钥
    * @return Key 密钥
    * @throws Exception
    */
   private static Key toKey(byte[] key) throws Exception {
      // 生成秘密密钥
      SecretKey secretKey = new SecretKeySpec(key, KEY_ALGORITHM);

      return secretKey;
   }

   /**
    * 解密
    * 
    * @param data
    *            待解密数据
    * @param key
    *            密钥
    * @return byte[] 解密数据
    * @throws Exception
    */
   public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
      // 还原密钥
      Key k = toKey(key);

      // 实例化
      Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);

      // 初始化，设置为解密模式
      cipher.init(Cipher.DECRYPT_MODE, k);

      // 执行操作
      return cipher.doFinal(data);
   }

   /**
    * 加密
    * 
    * @param data
    *            待加密数据
    * @param key
    *            密钥
    * @return byte[] 加密数据
    * @throws Exception
    */
   public static byte[] encrypt(byte[] data, byte[] key) throws Exception {
      // 还原密钥
      Key k = toKey(key);

      // 实例化
      Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);

      // 初始化，设置为加密模式
      cipher.init(Cipher.ENCRYPT_MODE, k);

      // 执行操作
      return cipher.doFinal(data);
   }

   /**
    * 生成密钥 <br>
    * 
    * @return byte[] 二进制密钥
    * @throws Exception
    */
   public static byte[] initKey() throws Exception {
      // 实例化
      KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);

      // 初始化
      kg.init(128);

      // 生成秘密密钥
      SecretKey secretKey = kg.generateKey();

      // 获得密钥的二进制编码形式
      return secretKey.getEncoded();
   }

   /**
    * 解密加密字符串
    * @param securityKey 密钥
    * @param content 待加密的字符串
    * @return
    * 说明：增加Base64编码
    */
   public static String decrypt(String securityKey, String content) {
      // 1. Base64解码cookie令牌
      try {
         content = ToolString.decode(content);
      } catch (Exception e) {
         if(log.isErrorEnabled()) log.error("Base64解码异常：content = " + content);
         return null;
      }

      // 2. 解密cookie令牌
      byte[] securityByte = Base64.decodeBase64(content);
      byte[] keyByte = Base64.decodeBase64(securityKey);

      byte[] dataByte = null;
      try {
         dataByte = decrypt(securityByte, keyByte);
      } catch (Exception e) {
         if(log.isErrorEnabled()) log.error("解密数据异常：content = " + content + "，securityKey = " + securityKey);
         return null;
      }
      String data = new String(dataByte);

      return data;
   }

   /**
    * 解密加密字符串
    * @param content 待加密的字符串
    * @return 
    * 说明：增加Base64编码
    */
   public static String decrypt(String content) {
      String securityKey = PropKit.get(ConstantInit.config_securityKey_key);
      return decrypt(securityKey, content);
   }

   /**
    * 生成加密字符串
    * @param securityKey 密钥
    * @param content  待加密的字符串
    * @return 
    * 说明：增加Base64编码
    */
   public static String encrypt(String securityKey, String content) {
      byte[] authTokenByte = null;
      try {
         authTokenByte = content.getBytes(ToolString.encoding);
      } catch (UnsupportedEncodingException e) {
         if(log.isErrorEnabled()) log.error("字符串数据转byte异常：content = " + content);
         return null;
      }
      byte[] keyByte = Base64.decodeBase64(securityKey);

      // 认证cookie加密
      byte[] securityByte = null;
      try {
         securityByte = encrypt(authTokenByte, keyByte);
      } catch (Exception e) {
         if(log.isErrorEnabled()) log.error("加密数据异常：content = " + content + "，securityKey = " + securityKey);
         return null;
      }
      String securityCookie = Base64.encodeBase64String(securityByte);

      // 认证cookie Base64编码
      try {
         securityCookie = ToolString.encode(securityCookie);
      } catch (Exception e) {
         if(log.isErrorEnabled()) log.error("数据Base64编码异常：content = " + content + "，securityKey = " + securityKey);
         return null;
      }

      return securityCookie;
   }

   /**
    * 生成加密字符串
    * @param content 待加密的字符串
    * @return 
    * 说明：增加Base64编码
    */
   public static String encrypt(String content) {
      String securityKey = PropKit.get(ConstantInit.config_securityKey_key);
      return encrypt(securityKey, content);
   }

}