package com.example.javieraviles.utils.security;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

/**
 * @author JAVIERAVILES
 *
 * This class will encrypt/decrypt strings (intended for passwords mainly) into any specified algorithm with a secret.
 *
 * The initial purpose of it is to encrypt/decrypt passwords (maybe stored in atable in the database and want to be read?)
 */
public class StringCipher {

	private static final String secret = "your-secret-here";
	private static final String algorithm = "Blowfish";

    /**
     * Encrypts a string (intended for passwords) with the specified secret and algorithm. base 64.
     *
     * @param password the password to be encrypted, plain text
     * @return the encrypted password
     * @throws Exception in case some error happens in the process of encrypting
     */
    public static String encrypt(final String password) throws Exception {
        byte[] keyData = secret.getBytes();
        SecretKeySpec secretKeySpec = new SecretKeySpec(keyData, algorithm);
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec);
        byte[] hasil = cipher.doFinal(password.getBytes());
        return new BASE64Encoder().encode(hasil);
    }

    /**
     * Decrypts a string (intended for passwords) with the specified secret and algorithm. base 64.
     *
     * @param password the password to be decrypted
     * @return the decrypted password, plain text
     * @throws Exception in case some error happens in the process of decrypting
     */
    public static String decrypt(final String string) throws Exception {
        byte[] keyData = secret.getBytes();
        SecretKeySpec secretKeySpec = new SecretKeySpec(keyData, algorithm);
        Cipher cipher = Cipher.getInstance(algorithm);
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec);
        byte[] hasil = cipher.doFinal(new BASE64Decoder().decodeBuffer(string));
        return new String(hasil);
    }
}