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/*
 * Copyright 2015-2017 OpenCB
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.opencb.commons.utils;

//import org.apache.commons.codec.binary.Base64;
//import org.apache.commons.codec.digest.DigestUtils;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

/**
 * @author Cristina Yenyxe Gonzalez Garcia 
 */
public final class CryptoUtils {

    private CryptoUtils() {
    }

    // Method to generate a new AES key
    public static SecretKey generateKey(int n) throws Exception {
        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
        keyGenerator.init(n);
        SecretKey key = keyGenerator.generateKey();
        return key;
    }

    // Method to encrypt a string using a given key
    public static String encrypt(String strToEncrypt, SecretKey secretKey) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
        byte[] encryptedBytes = cipher.doFinal(strToEncrypt.getBytes());
        return Base64.getEncoder().encodeToString(encryptedBytes);
    }

    // Method to decrypt a string using a given key
    public static String decrypt(String strToDecrypt, SecretKey secretKey) throws Exception {
        Cipher cipher = Cipher.getInstance("AES");
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(strToDecrypt));
        return new String(decryptedBytes);
    }

    public static String secretKeyToString(SecretKey secretKey) {
        return Base64.getEncoder().encodeToString(secretKey.getEncoded());
    }

    public static SecretKey stringToSecretKey(String keyString) {
        byte[] decodedKey = Base64.getDecoder().decode(keyString);
        return new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");
    }

    public static byte[] sha1(byte[] input) throws NoSuchAlgorithmException {
        MessageDigest sha1 = MessageDigest.getInstance("SHA-1");
        return sha1.digest(input);
    }

    public static byte[] sha256(byte[] input) throws NoSuchAlgorithmException {
        MessageDigest sha256 = MessageDigest.getInstance("SHA-256");
        return sha256.digest(input);
    }

    public static String sha1(String text) throws NoSuchAlgorithmException {
        MessageDigest sha1 = MessageDigest.getInstance("SHA-1");
        byte[] digest = sha1.digest(text.getBytes());
        return bytes2String(digest);
    }

    public static String sha256(String text) throws NoSuchAlgorithmException {
        MessageDigest sha256 = MessageDigest.getInstance("SHA-256");
        byte[] digest = sha256.digest(text.getBytes());
        return bytes2String(digest);
    }

    private static String bytes2String(byte[] bytes) {
        StringBuilder string = new StringBuilder();
        for (byte b : bytes) {
            String hexString = Integer.toHexString(0x00FF & b);
            string.append(hexString.length() == 1 ? "0" + hexString : hexString);
        }
        return string.toString();
    }


    @Deprecated
    public static byte[] encryptSha1(String strToEncrypt) {
        byte[] digest = null;
        try {
            MessageDigest instance = MessageDigest.getInstance("SHA-256");
            digest = instance.digest(strToEncrypt.getBytes());
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return digest;
    }
}