(PHP ActiveX) RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Create an instance of a certificate store object, load a PFX file,
// locate the certificate we need, and use it for signing.
// (a PFX file may contain more than one certificate.)
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.CertStore')
$certStore = new COM("Chilkat.CertStore");

// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
$success = $certStore->LoadPfxFile('chilkat.pfx','test');
if ($success != 1) {
    print $certStore->LastErrorText . "\n";
    exit;
}

// cert is a Chilkat.Cert
$cert = $certStore->FindCertBySubject('Chilkat Software, Inc.');
if ($certStore->LastMethodSuccess == 0) {
    print $certStore->LastErrorText . "\n";
    exit;
}

// pkey is a Chilkat.PrivateKey
$pkey = $cert->ExportPrivateKey();
if ($cert->LastMethodSuccess == 0) {
    print $cert->LastErrorText . "\n";

    exit;
}

// Get the private key in XML format:
$pkeyXml = $pkey->getXml();

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");

// Import the private key into the RSA component:
$success = $rsa->ImportPrivateKey($pkeyXml);
if ($success != 1) {
    print $rsa->LastErrorText . "\n";

    exit;
}

// Encode the signature as a hex string
$rsa->EncodingMode = 'hex';

$strData = 'This is the string to be signed.';

// Sign the string using the sha-1 hash algorithm.
// Other valid choices are "sha-256", "md2" and "md5".
$hexSig = $rsa->signStringENC($strData,'sha-1');

print $hexSig . "\n";

print 'Success!' . "\n";

?>