Android Open Source - base-android-utils A E S

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License

The source code is released under:
Apache License
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Java Source Code

package me.pc.mobile.helper.v14.crypt;
//from   w  ww.  j av a 2s . com
import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

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

/**
 * AES??????
 * 
 * @author?junning.li
 * @since?2011-6-1 ????08:16:22
 * @version:
 */
public class AES {
  /**
   * AES????
   * 
   * @param data
   *            ????????
   * @param key
   *            ?????
   * @return
   */
  public static byte[] encrypt(byte[] data, byte[] key) {
    CheckUtils.notEmpty(data, "data");
    CheckUtils.notEmpty(key, "key");
    if (key.length != 16) {
      throw new RuntimeException(
          "Invalid AES key length (must be 16 bytes)");
    }
    try {
      SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
      byte[] enCodeFormat = secretKey.getEncoded();
      SecretKeySpec seckey = new SecretKeySpec(enCodeFormat, "AES");
      Cipher cipher = Cipher
          .getInstance(ConfigureEncryptAndDecrypt.AES_ALGORITHM);// ??????
      cipher.init(Cipher.ENCRYPT_MODE, seckey);// ????
      byte[] result = cipher.doFinal(data);
      return result; // ??
    } catch (Exception e) {
      throw new RuntimeException("encrypt fail!", e);
    }
  }

  /**
   * AES????
   * 
   * @param data
   *            ?????
   * @param key
   *            ????
   * @return
   */
  public static byte[] decrypt(byte[] data, byte[] key) {
    CheckUtils.notEmpty(data, "data");
    CheckUtils.notEmpty(key, "key");
    if (key.length != 16) {
      throw new RuntimeException(
          "Invalid AES key length (must be 16 bytes)");
    }
    try {
      SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
      byte[] enCodeFormat = secretKey.getEncoded();
      SecretKeySpec seckey = new SecretKeySpec(enCodeFormat, "AES");
      Cipher cipher = Cipher
          .getInstance(ConfigureEncryptAndDecrypt.AES_ALGORITHM);// ??????
      cipher.init(Cipher.DECRYPT_MODE, seckey);// ????
      byte[] result = cipher.doFinal(data);
      return result; // ??
    } catch (Exception e) {
      throw new RuntimeException("decrypt fail!", e);
    }
  }

  public static String encryptToBase64(String data, String key) {
    try {
      byte[] valueByte = encrypt(
          data.getBytes(ConfigureEncryptAndDecrypt.CHAR_ENCODING),
          key.getBytes(ConfigureEncryptAndDecrypt.CHAR_ENCODING));
      return new String(Base64.encode(valueByte));
    } catch (UnsupportedEncodingException e) {
      throw new RuntimeException("encrypt fail!", e);
    }

  }

  public static String decryptFromBase64(String data, String key) {
    try {
      byte[] originalData = Base64.decode(data.getBytes());
      byte[] valueByte = decrypt(originalData,
          key.getBytes(ConfigureEncryptAndDecrypt.CHAR_ENCODING));
      return new String(valueByte,
          ConfigureEncryptAndDecrypt.CHAR_ENCODING);
    } catch (UnsupportedEncodingException e) {
      throw new RuntimeException("decrypt fail!", e);
    }
  }

  public static String encryptWithKeyBase64(String data, String key) {
    try {
      byte[] valueByte = encrypt(
          data.getBytes(ConfigureEncryptAndDecrypt.CHAR_ENCODING),
          Base64.decode(key.getBytes()));
      return new String(Base64.encode(valueByte));
    } catch (UnsupportedEncodingException e) {
      throw new RuntimeException("encrypt fail!", e);
    }
  }

  public static String decryptWithKeyBase64(String data, String key) {
    try {
      byte[] originalData = Base64.decode(data.getBytes());
      byte[] valueByte = decrypt(originalData,
          Base64.decode(key.getBytes()));
      return new String(valueByte,
          ConfigureEncryptAndDecrypt.CHAR_ENCODING);
    } catch (UnsupportedEncodingException e) {
      throw new RuntimeException("decrypt fail!", e);
    }
  }

  public static byte[] genarateRandomKey() {
    KeyGenerator keygen = null;
    try {
      keygen = KeyGenerator
          .getInstance(ConfigureEncryptAndDecrypt.AES_ALGORITHM);
    } catch (NoSuchAlgorithmException e) {
      throw new RuntimeException(" genarateRandomKey fail!", e);
    }
    SecureRandom random = new SecureRandom();
    keygen.init(random);
    Key key = keygen.generateKey();
    return key.getEncoded();
  }

  public static String genarateRandomKeyWithBase64() {
    return new String(Base64.encode(genarateRandomKey()));
  }

}
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