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// Create new configuration that specifies the error correction
Map<EncodeHintType, ErrorCorrectionLevel> hints = new HashMap<EncodeHintType, ErrorCorrectionLevel>();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

QRCodeWriter writer = new QRCodeWriter();
BitMatrix bitMatrix = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();

try {
    // Create a qr code with the url as content and a size of 250x250 px

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#############################################
# Push de la rama actual
git push origin $rama_actual

#############################################
# Volver a un commit anterior, descartando los cambios
git reset --HARD $SHA1

#############################################
# Ver y descargar Ramas remotas

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#!/bin/bash
 
# -- DEFINICIÓN VARIABLES DE FECHA Y HORA.
DIA=`date +"%Y%m%d"`
HORA=`date +"%H%M"`
 
# -- CONFIGURACIÓN DE VARIABLES GLOBALES
DUMP_HOME="."
DUMP_FILE="dump_"$DIA"_"$HORA".sql"
 

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#!/bin/bash
 
# -- CONFIGURACIÓN DE VARIABLES GLOBALES
APP_HOME="."
APP_OUTPUT="import.log"
 
MYSQL_DBUSER_ADM="root"
MYSQL_DBUSER="admin"
MYSQL_DBPASS="admin"
MYSQL_DBNAME="mi_db"

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## Configure eth0
#
# vi /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE="eth0"
NM_CONTROLLED="yes"
ONBOOT=yes
HWADDR=A4:BA:DB:37:F1:04
TYPE=Ethernet
BOOTPROTO=static

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/* Estructura y Datos de las Regiones, Provincias */
/* y Comunas de Chile.                            */
/*                                                */
/* Fecha: Julio 2010                              */
/* Autor: Juan Pablo Aqueveque - juque.cl         */

-- 
-- Comunas
--
DROP TABLE IF EXISTS `comunas`;

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var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/db_name');

// map function
var map = function(){
  emit(this.field_to_group_by, {
    other_fields: this.other_fields
    // list other fields like above to select them
  })
}

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How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

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import javax.crypto.Cipher;
import java.nio.ByteBuffer;
import java.security.GeneralSecurityException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;

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#!/usr/bin/env python

import base64

from Crypto import Random
from Crypto.Cipher import AES

BS = 16
pad = lambda s: s + (BS - len(s) % BS) * chr(BS - len(s) % BS)
unpad = lambda s : s[0:-ord(s[-1])]