ar.gob.ambiente.servicios.gestionpersonas.entidades.util.CriptPass.java Source code

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Here is the source code for ar.gob.ambiente.servicios.gestionpersonas.entidades.util.CriptPass.java

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package ar.gob.ambiente.servicios.gestionpersonas.entidades.util;

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.SecretKeySpec;
import javax.persistence.Id;
import org.apache.commons.codec.binary.Base64;

/**
 *
 * @author rodriguezn
 */
public class CriptPass {
    @Id
    private Long id;
    // Cadena para la creacin de contraseas aleatorias.
    public static String base = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ@!#$";

    /**
     * Mtodo para crear las contraseas de manera aleatoria al crear un usuario por primera vez
     * @return 
     */
    public static String generar() {
        int longitud = base.length();
        String contrasenia = "";
        for (int i = 0; i < 8; i++) {
            int numero = (int) (Math.random() * (longitud));
            String caracter = base.substring(numero, numero + 1);
            contrasenia = contrasenia + caracter;
        }
        return contrasenia;
    }

    /**
     * Mtodo para encriptar las contraseas
     * @param texto
     * @return 
     */
    public static String encriptar(String texto) {

        String secretKey = "zorbazorbas"; //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) {
            System.out.println(ex.getMessage());
        }
        return base64EncryptedString;
    }

    /**
     * Mtodo para desencriptar una contrasea encriptada
     * @param textoEncriptado
     * @return
     * @throws Exception 
     */
    public static String desencriptar(String textoEncriptado) throws Exception {

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

        try {
            byte[] message = Base64.decodeBase64(textoEncriptado.getBytes("utf-8"));
            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 decipher = Cipher.getInstance("DESede");
            decipher.init(Cipher.DECRYPT_MODE, key);

            byte[] plainText = decipher.doFinal(message);

            base64EncryptedString = new String(plainText, "UTF-8");

        } catch (UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException
                | InvalidKeyException | IllegalBlockSizeException | BadPaddingException ex) {
            System.out.println(ex.getMessage());
        }
        return base64EncryptedString;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

}