Java中AES加密解密以及签名校验
Java中AES加密解密以及签名校验
吕兵阳 发表于3个月前
Java中AES加密解密以及签名校验
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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)));

  }


}
标签: java AES
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