com.frame.Conf.Utilidades.java Source code

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Here is the source code for com.frame.Conf.Utilidades.java

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package com.frame.Conf;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
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;
import org.apache.commons.codec.binary.Base64;
import static org.apache.commons.codec.binary.Base64.decodeBase64;
import static org.apache.commons.codec.binary.Base64.encodeBase64;

/**
 *
 * @author Erick
 */
public class Utilidades {

    /**
     * Constructor de la clase Utilidades
     */
    private final static String alg = "AES";
    // Definicin del modo de cifrado a utilizar
    private final static String cI = "AES/CBC/PKCS5Padding";

    public Utilidades() {

    }

    /**
     * 
     * @param keypass Es la llave plublica para enctriptar el texto
     * @param texto Texto a encriptar
     * @return retorna el hash del texto encriptado
     * @throws Exception 
     */
    public String Encriptar(String keypass, String texto) throws Exception {

        String secretKey = keypass; //llave para encriptar datos
        String base64EncryptedString = "";

        try {

            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8"));
            byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);

            SecretKey key = new SecretKeySpec(keyBytes, "DESede");
            Cipher cipher = Cipher.getInstance("DESede");
            cipher.init(Cipher.ENCRYPT_MODE, key);

            byte[] plainTextBytes = texto.getBytes("utf-8");
            byte[] buf = cipher.doFinal(plainTextBytes);
            byte[] base64Bytes = Base64.encodeBase64(buf);
            base64EncryptedString = new String(base64Bytes);

        } catch (NoSuchAlgorithmException | UnsupportedEncodingException | NoSuchPaddingException
                | InvalidKeyException | IllegalBlockSizeException | BadPaddingException ex) {
            throw new Exception(ex.getMessage());
        }
        return base64EncryptedString;
    }

    /**
     * 
     * @param keypass Es la llave plublica para desencriptar el texto
     * @param textoEncriptado hash del texto a desencriptar
     * @return retorna el texto desencriptado
     * @throws Exception 
     */
    public String Desencriptar(String keypass, String textoEncriptado) throws Exception {

        String secretKey = keypass; //llave para encriptar datos
        String base64EncryptedString = "";

        try {
            System.out.println("checkpoint");
            byte[] message = Base64.decodeBase64(textoEncriptado.getBytes("utf-8"));
            MessageDigest md = MessageDigest.getInstance("MD5");
            System.out.println("checkpoint2");
            byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8"));
            byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
            System.out.println("checkpoint3");
            SecretKey key = new SecretKeySpec(keyBytes, "DESede");

            System.out.println("checkpoint4");
            Cipher decipher = Cipher.getInstance("DESede");
            decipher.init(Cipher.DECRYPT_MODE, key);
            System.out.println("checkpoint5");

            byte[] plainText = decipher.doFinal(message);
            System.out.println("checkpoint6");
            base64EncryptedString = new String(plainText, "UTF-8");

        } catch (UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException
                | InvalidKeyException | IllegalBlockSizeException | BadPaddingException ex) {
            throw new Exception(ex.getMessage());
        }
        return base64EncryptedString;
    }

    public String Desencriptar2(String keypass, String textoEncriptado) throws Exception {

        String secretKey = keypass; //llave para encriptar datos
        String base64EncryptedString = "";

        try {
            System.out.println("checkpoint");
            byte[] message = Base64.decodeBase64(textoEncriptado.getBytes("utf-8"));
            MessageDigest md = MessageDigest.getInstance("MD5");
            System.out.println("checkpoint2");
            byte[] digestOfPassword = md.digest(secretKey.getBytes("utf-8"));
            byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24);
            System.out.println("checkpoint3");
            SecretKey key = new SecretKeySpec(keyBytes, "DESede");

            System.out.println("checkpoint4");
            Cipher decipher = Cipher.getInstance("DESede");
            decipher.init(Cipher.DECRYPT_MODE, key);
            System.out.println("checkpoint5");

            byte[] plainText = decipher.doFinal(message);
            System.out.println("checkpoint6");
            base64EncryptedString = new String(plainText, "UTF-8");

        } catch (UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException
                | InvalidKeyException | IllegalBlockSizeException | BadPaddingException ex) {
            throw new Exception(ex.getMessage());
        }
        return base64EncryptedString;
    }

    public static String encrypt(String key, String iv, String cleartext) throws Exception {
        Cipher cipher = Cipher.getInstance(cI);
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), alg);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec);
        byte[] encrypted = cipher.doFinal(cleartext.getBytes());
        return new String(encodeBase64(encrypted));
    }

    /**
     * Funcin de tipo String que recibe una llave (key), un vector de inicializacin (iv)
     * y el texto que se desea descifrar
     * @param key la llave en tipo String a utilizar
     * @param iv el vector de inicializacin a utilizar
     * @param encrypted el texto cifrado en modo String
     * @return el texto desencriptado en modo String
     * @throws Exception puede devolver excepciones de los siguientes tipos: NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException
     */
    public static String decrypt(String key, String iv, String encrypted) throws Exception {
        Cipher cipher = Cipher.getInstance(cI);
        SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), alg);
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
        byte[] enc = decodeBase64(encrypted);
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
        byte[] decrypted = cipher.doFinal(enc);
        return new String(decrypted);
    }
}