Create certificate validation hash

createHashDownload.php

<?php

createDownload($_REQUEST['csr']);

function createDownload($csr_content)
{
    # Write CSR content into csr.pem
    file_put_contents("csr.pem", $csr_content)
        or die("PEM file could not be written. Write permissions set?\n");

    # Convert CSR from PEM to DER format
    system("openssl req -outform der -in csr.pem -out csr.der", $error_code);
    if ($error_code != 0) die("Error while converting PEM to DER file.\n");

    # Generate hash content
    $output = sha1_file("csr.der") . "\ncomodoca.com\n";
      
    # Download resulting hash file
    $filename = strtoupper(md5_file("csr.der")) . ".txt";
    header("Content-Type: application/txt");
    header('Content-Disposition: attachment; filename="' . $filename . "'");
    echo $output;
}

?>