Android Open Source - CryptoLock Crypto

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From Project

Back to project page CryptoLock.

License

The source code is released under:

Apache License

Java Source Code

package com.example.cryptolock;
//from   w  w  w  . j  av  a 2s. co  m
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import android.content.Context;
import android.util.Base64;

public class Crypto {

  private static final String engine = "AES";
  private static final String crypto = "AES/CBC/PKCS5Padding";
  private static Context ctx;
  public Crypto(Context cntx) {
    ctx = cntx;
  }

  public byte[] cipher(byte[] data, int mode) throws NoSuchAlgorithmException,NoSuchPaddingException,InvalidKeyException,IllegalBlockSizeException,BadPaddingException,InvalidAlgorithmParameterException {
    KeyManager km = new KeyManager(ctx);
    SecretKeySpec sks = new SecretKeySpec(km.getId(), engine);
    IvParameterSpec iv = new IvParameterSpec(km.getIv());
    Cipher c = Cipher.getInstance(crypto);
    c.init(mode, sks, iv);
    return c.doFinal(data);
  }

  public byte[] encrypt(byte[] data) throws InvalidKeyException,
  NoSuchAlgorithmException, NoSuchPaddingException,
  IllegalBlockSizeException, BadPaddingException,
  InvalidAlgorithmParameterException {
    return cipher(data, Cipher.ENCRYPT_MODE);
  }

  public byte[] decrypt(byte[] data) throws InvalidKeyException,
  NoSuchAlgorithmException, NoSuchPaddingException,
  IllegalBlockSizeException, BadPaddingException,
  InvalidAlgorithmParameterException {
    return cipher(data, Cipher.DECRYPT_MODE);
  }

  public String armorEncrypt(byte[] data) throws InvalidKeyException,NoSuchAlgorithmException,
  NoSuchPaddingException,IllegalBlockSizeException,
  BadPaddingException,InvalidAlgorithmParameterException {
    return Base64.encodeToString(encrypt(data), Base64.DEFAULT);
  }

  public String armorDecrypt(String data) throws InvalidKeyException,NoSuchAlgorithmException,
  NoSuchPaddingException,IllegalBlockSizeException,
  BadPaddingException,InvalidAlgorithmParameterException {
    return new String(decrypt(Base64.decode(data, Base64.DEFAULT)));
  }
}

Java Source Code List

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