密鑰算法

package com.sprucetec.tms.fee.utils;

import java.security.Key;

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

public class AES {
  //密鑰算法   
  public static final String KEY_ALGORITHM = "AES";

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

  /** 
   * 生成密鑰 
   */
  public static String initkey() throws Exception {
    KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM); //實例化密鑰生成器   
    kg.init(128); //初始化密鑰生成器:AES要求密鑰長度爲128,192,256位   
    SecretKey secretKey = kg.generateKey(); //生成密鑰   
    return Base64.encode(secretKey.getEncoded()); //獲取二進制密鑰編碼形式 
  }

  /** 
   * 加密數據 
   * @param data 待加密數據 
   * @param key  密鑰 
   * @return 加密後的數據 
   * */
  public static String encrypt(String data, String key) throws Exception {
    Key k = new SecretKeySpec(key.getBytes("UTF-8"), KEY_ALGORITHM);
    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM); //實例化Cipher對象，它用於完成實際的加密操作   
    cipher.init(Cipher.ENCRYPT_MODE, k); //初始化Cipher對象，設置爲加密模式   
    return Base64.encode(cipher.doFinal(data.getBytes("UTF-8"))); //執行加密操作。加密後的結果用Base64編碼進行傳輸   
  }

  /** 
   * 解密數據 
   * @param data 待解密數據 
   * @param key  密鑰 
   * @return 解密後的數據 
   * */
  public static String decrypt(String data, String key) throws Exception {
    Key k = new SecretKeySpec(key.getBytes("UTF-8"), KEY_ALGORITHM);
    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
    cipher.init(Cipher.DECRYPT_MODE, k); //初始化Cipher對象，設置爲解密模式   
    return new String(cipher.doFinal(Base64.decode(data))); //執行解密操作   
  }

  public static void main(String[] args) throws Exception {
      System.out.println(AES.encrypt("asdf", "1234560000000000"));
      System.out.println(AES.decrypt("sT4nPMyTugE2pQnCNQPtJw==", "1234560000000000"));
  }
}