import java.security.InvalidKeyException;import java.security.Key;import java.security.NoSuchAlgorithmException;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.KeyGenerator;import javax.crypto.NoSuchPaddingException;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import org.apache.commons.codec.binary.Base64;import org.apache.commons.codec.digest.DigestUtils;/** * Created by Lb on 2017/9/10. */public class AESCoder {  //密钥算法  public static final String KEY_ALGORITHM = "AES";  //工作模式，填充模式  public static final String CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";  /**   * 转换密钥   *   * @param key 二进制密钥   * @return Key密钥   */  private static Key toKey(byte[] key) {    SecretKey secretKey = new SecretKeySpec(key, KEY_ALGORITHM);    return secretKey;  }  /**   * 解密   */  public static byte[] decrpyt(byte[] data, byte[] key)      throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {    //还原密钥    Key k = toKey(key);    //实例化    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);    //初始化    cipher.init(Cipher.DECRYPT_MODE, k);    //执行操作    return cipher.doFinal(data);  }  /**   * 加密   */  public static byte[] encrypt(byte[] data, byte[] key)      throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {    //还原密钥    Key k = toKey(key);    //实例化    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);    //初始化    cipher.init(Cipher.ENCRYPT_MODE, k);    //执行操作    return cipher.doFinal(data);  }  /**   * 生成密钥   */  public static byte[] initKey() throws NoSuchAlgorithmException {    //实例化    KeyGenerator keyGenerator = KeyGenerator.getInstance(KEY_ALGORITHM);    //AES 要求密钥长度为128位、192位或256位    keyGenerator.init(128);    //生成秘密密钥    SecretKey secretKey = keyGenerator.generateKey();    //获取密钥的二进制编码形式    return secretKey.getEncoded();  }  /**   * 初始化密钥   *   * @return Base64编码密钥   */  public static String initKeyString() throws NoSuchAlgorithmException {    return Base64.encodeBase64String(initKey());  }  /**   * 获取密钥   */  public static byte[] getKey(String key) {    return Base64.decodeBase64(key);  }  /**   * 解密   *   * @param data 待解密数据   * @param key 密钥   * @return byte[] 解密数据   */  public static byte[] decrypt(byte[] data, String key)      throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {    return decrpyt(data, getKey(key));  }  /**   * 加密   *   * @param data 待加密数据   * @param key 密钥   * @return byte[]加密数据   */  public static byte[] encrypt(byte[] data, String key)      throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {    return encrypt(data, getKey(key));  }  /**   * 摘要处理   *   * @param data 待摘要数据   * @return 摘要字符串   */  public static String shaHex(byte[] data) {    return DigestUtils.md5Hex(data);  }  /**   * 验证   *   * @param data 待摘要数据   * @param messageDigest 摘要字符串   * @return 验证结果   */  public static boolean vailidate(byte[] data, String messageDigest) {    return messageDigest.equals(shaHex(data));  }  public static void main(String[] args)      throws NoSuchAlgorithmException, IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchPaddingException {    String inputStr = "AES18803696960http://www.baidu;com";    byte[] inputData = inputStr.getBytes();    System.out.println("原文：" + inputStr);    //初始化密钥    byte[] key = AESCoder.initKey();    System.out.println("密钥：" + Base64.encodeBase64String(key));    //加密    inputData = AESCoder.encrypt(inputData, key);    System.out.println("加密后：" + Base64.encodeBase64String(inputData));    //解密    byte[] outputData = AESCoder.decrpyt(inputData, key);    String outputStr = new String(outputData);    System.out.println("解密后：" + outputStr);    System.out.println("校验签名：" + AESCoder.vailidate(inputData, AESCoder.shaHex(inputData)));  }}