title: File Signature Validation
body: <p>I Have used a utility written by Mark Russinovich, it is used to validate the file signature.
  Any one have ideas how this can be done, i know it is not a simple code, but just i need some hints, APIs, steps, A guide map, Just to go in the correct direction.
  I read too much a bout the cryptAPIs, then I read too much about the certAPIs, but i cannot get any thing useful to simply link a given file with the (unknown to me) data stored in the windows.</p>
  
  <p>if any can help me in this issue please help, thanks a lot.</p>