import android.util.Base64;

import java.security.MessageDigest;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class AES64 {

   private final Cipher cipher;
   private final SecretKeySpec key;
   private AlgorithmParameterSpec spec;
   // 密钥
   public static final String SEED_16_CHARACTER = "更换成自己的密钥";

   public AES64() throws Exception {
      // hash password with SHA-256 and crop the output to 128-bit for key
      MessageDigest digest = MessageDigest.getInstance("SHA-256");//AES-256-CBC
      digest.update(SEED_16_CHARACTER.getBytes("UTF-8"));
      byte[] keyBytes = new byte[32];
      System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);
      cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
      key = new SecretKeySpec(keyBytes, "AES");
      spec = getIV();
   }

   public AlgorithmParameterSpec getIV() {
      byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
      IvParameterSpec ivParameterSpec;
      ivParameterSpec = new IvParameterSpec(iv);
      return ivParameterSpec;
   }

   /**
    * 加密
    * @param plainText
    * @return
    * @throws Exception
    */
   public String encrypt(String plainText) throws Exception {
      cipher.init(Cipher.ENCRYPT_MODE, key, spec);
      byte[] encrypted = cipher.doFinal(plainText.trim().getBytes("UTF-8"));
      String encryptedText = new String(Base64.encode(encrypted,
            Base64.DEFAULT), "UTF-8");
      encryptedText = encryptedText.replace("\n", "");
      return encryptedText;
   }

   /**
    * 解密
    * @param cryptedText
    * @return
    * @throws Exception
    */
   public String decrypt(String cryptedText) throws Exception {
      cipher.init(Cipher.DECRYPT_MODE, key, spec);
      byte[] bytes = Base64.decode(cryptedText, Base64.DEFAULT);
      byte[] decrypted = cipher.doFinal(bytes);
      String decryptedText = new String(decrypted, "UTF-8");
      return decryptedText;
   }

}

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