Digital signature with Javascript

So the answer was to use JSRSASIGN (http://kjur.github.io/jsrsasign/) in the examples posted in github it uses PEM files, I build an example to use CER+ KEY + PASSWORD >> https://github.com/alfredomova/firmaJs-with-jsrsasign-example,

for that specific example i used sparkMD5(https://github.com/satazor/SparkMD5) to calculate the file's hash.