title: CRT to key and csr backward
body: <ol>
  <li>I have generated RSA PRIVATE KEY .KEY and Certificate sign request .CSR</li>
  <li>Then i load thoose files into CA and got .CRT(DER) file and Root_CA.CRT (PEM) file</li>
  <li>Then i convert .CRT(DER) using RSA PRIVATE KEY .KEY to .CRT (PEM)</li>
  <li>I generate .pfx (PKCS#12) from .CRT (PEM) using RSA PRIVATE KEY .KEY</li>
  </ol>
  <p>And now i loosing RSA PRIVATE KEY .KEY and Certificate sign request .CSR</p>
  <p>Question:
  Is that possible to restore RSA PRIVATE KEY .KEY and Certificate sign request .CSR from .CRT(DER) or .CRT (PEM), having Root_CA.CRT (PEM) file?</p>