AESTool

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import javax.crypto.spec.IvParameterSpec;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.engines.AESFastEngine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.util.encoders.Hex;
import org.springframework.stereotype.Component;

/**
* AES encryption and decryption tool.
* @see http://lixuanbin.iteye.com/blog/2078020
* @author sky
*
*/
@Component
public class AESTool {

   private static final String CHARSET = "UTF-8";

   private String key;

   private byte[] initVector = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
           0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30 };

   /**
   * Encrypt the content with a given key using aes algorithm.
   * 使用aes算法对内容进行加密
   * @param content
   * @param key
   *            must contain exactly 32 characters
   * @return
   * @throws Exception
   */
   public String encrypt(String content) throws Exception {
       if (key == null) {

           throw new IllegalArgumentException("Key cannot be null!");
       }
       String encrypted = null;
       byte[] keyBytes = key.getBytes(CHARSET);
       if (keyBytes.length != 32 && keyBytes.length != 24
               && keyBytes.length != 16) {
           throw new IllegalArgumentException(
                   "Key length must be 128/192/256 bits!");
       }
       byte[] encryptedBytes = null;
       encryptedBytes = encrypt(Base64.encode(content.getBytes(CHARSET)), keyBytes, initVector);
       encrypted = new String(Hex.encode(encryptedBytes));
       return encrypted;
   }

   /**
   * Decrypt the content with a given key using aes algorithm.
   * 使用aes算法对内容进行解密
   * @param content
   * @param key
   *            must contain exactly 32 characters
   * @return
   * @throws Exception
   */
   public String decrypt(String content) throws Exception {
       if (key == null) {
           throw new IllegalArgumentException("Key cannot be null!");
       }
       String decrypted = null;
       byte[] encryptedContent = Hex.decode(content);
       byte[] keyBytes = key.getBytes(CHARSET);
       byte[] decryptedBytes = null;

       if (keyBytes.length != 32 && keyBytes.length != 24
               && keyBytes.length != 16) {
           throw new IllegalArgumentException(
                   "Key length must be 128/192/256 bits!");
       }
       decryptedBytes = decrypt(encryptedContent, keyBytes, initVector);
       decrypted = new String(Base64.decode(decryptedBytes));
       return decrypted;
   }

   /**
   * Encrypt data.
   *
   * @param plain
   * @param key
   * @param iv
   * @return
   * @throws Exception
   */
   public byte[] encrypt(byte[] plain, byte[] key, byte[] iv) throws Exception {
       PaddedBufferedBlockCipher aes = new PaddedBufferedBlockCipher(
               new CBCBlockCipher(new AESFastEngine()));
       CipherParameters ivAndKey = new ParametersWithIV(new KeyParameter(key),
               iv);
       aes.init(true, ivAndKey);
       return cipherData(aes, plain);
   }

   /**
   * Decrypt data.
   * 解密数据
   * @param cipher
   * @param key
   * @param iv
   * @return
   * @throws Exception
   */
   public byte[] decrypt(byte[] cipher, byte[] key, byte[] iv)
           throws Exception {
       PaddedBufferedBlockCipher aes = new PaddedBufferedBlockCipher(
               new CBCBlockCipher(new AESFastEngine()));
       CipherParameters ivAndKey = new ParametersWithIV(new KeyParameter(key),
               iv);
       aes.init(false, ivAndKey);
       return cipherData(aes, cipher);
   }

   /**
   * Encrypt or decrypt data.
   * 加密或解密数据
   * @param cipher
   * @param data
   * @return
   * @throws Exception
   */
   private byte[] cipherData(PaddedBufferedBlockCipher cipher, byte[] data)
           throws Exception {
       int minSize = cipher.getOutputSize(data.length);
       byte[] outBuf = new byte[minSize];
       int length1 = cipher.processBytes(data, 0, data.length, outBuf, 0);
       int length2 = cipher.doFinal(outBuf, length1);
       int actualLength = length1 + length2;
       byte[] result = new byte[actualLength];
       System.arraycopy(outBuf, 0, result, 0, result.length);
       return result;
   }

   public static void main(String[] args) throws Exception {
       byte[] initVector = { 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30,
               0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30, 0x30 };
//       LOG.debug(new String(initVector));
       System.out.println(new String(initVector));
       AESTool aesTool = new AESTool();
       aesTool.setKey("7BFD6AB2227C4822");
       String xml = "{\"SERVICE\":{\"SERVICE_HEADER\":{\"SERVICE_ID\":\"TNQPLPAllLoanFeeDef\",\"ORG\":\"000000000001\",\"CHANNEL_ID\":\"BANK\",\"ACQ_ID\":\"00000000\",\"SUB_TERMINAL_TYPE\":\"RMPS\",\"SERVICESN\":\"APP2016032409295126650\",\"OP_ID\":null,\"REQUEST_TIME\":\"20160324092951\",\"VERSION_ID\":\"01\",\"MAC\":null,\"SERV_RESPONSE\":null},\"SERVICE_BODY\":{\"REQUEST\":{\"LOAN_CODE\":null},\"RESPONSE\":null}}}{\"SERVICE\":{\"SERVICE_HEADER\":{\"SERVICE_ID\":\"TNQPLPAllLoanFeeDef\",\"ORG\":\"000000000001\",\"CHANNEL_ID\":\"BANK\",\"ACQ_ID\":\"00000000\",\"SUB_TERMINAL_TYPE\":\"RMPS\",\"SERVICESN\":\"APP2016032409295126650\",\"OP_ID\":null,\"REQUEST_TIME\":\"20160324092951\",\"VERSION_ID\":\"01\",\"MAC\":null,\"SERV_RESPONSE\":null},\"SERVICE_BODY\":{\"REQUEST\":{\"LOAN_CODE\":null},\"RESPONSE\":null}}}";
       String encrypted = aesTool.encrypt(xml);
       String decrypted = aesTool.decrypt(encrypted);
       System.out.println("encrypte加密"+encrypted);
       System.out.println("decrypted解密"+decrypted);
   }

   public String getKey() {
       return key;
   }

   public void setKey(String key) {
       this.key = key;
   }

}

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