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phpopensslcertificate

How to convert PFX to CRT and PEM using PHP?

How can I convert .pfx (PKCS12 or .p12) certificate to .crt and .pem using PHP OpenSSL functions, so I avoid commandline tools, which are not allowed on my public server.

Solution 
  • <?php
$res = [];
$openSSL = openssl_pkcs12_read($pkcs12, $res, $cert_password);
if(!$openSSL) {
    throw new ClientException("Error: ".openssl_error_string());
}
// this is the CER FILE
file_put_contents('CERT.cer', $res['pkey'].$res['cert'].implode('', $res['extracerts']));

// this is the PEM FILE
$cert = $res['cert'].implode('', $res['extracerts']);
file_put_contents('KEY.pem', $cert);