/*
 * Copyright (c) 2017-2018 PlayerOne.
 *
 * The MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package io.plactal.eoscommander.crypto.util;

import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


/**
 * Created by swapnibble on 2017-08-09.
 */

public class CryptUtil {

    public static byte[] aesEncrypt( byte[] key, byte[] data, byte[] iv ) {

        byte[] encrypted = null;

        try {

            SecretKey secureKey = new SecretKeySpec(key, "AES");
            Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");

            c.init(Cipher.ENCRYPT_MODE, secureKey, new IvParameterSpec(iv));

            encrypted = c.doFinal(data);

        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        }

        return encrypted;
    }

    public static byte[] aesDecrypt( byte[] key, byte[] data,  byte[] iv) {
        byte[] decrypted = null;
        try {
            SecretKey secureKey = new SecretKeySpec(key, "AES");
            Cipher c = Cipher.getInstance("AES/CBC/PKCS5Padding");

            if ( iv.length > 16 ) {
                iv = Arrays.copyOf( iv, 16 ); // aes/cbc 에선 iv 는 16-byte !
            }

            c.init(Cipher.DECRYPT_MODE, secureKey, new IvParameterSpec(iv));

            decrypted = c.doFinal(data);

        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        }

        return decrypted;
    }
}