RSA Signature with Certificate's Private Key from PFX

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

Download 32-bit Chilkat RSA ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

<?php



//  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.)
$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 != true) {
    print $certStore->lastErrorText() . "\n";
    exit;
}

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

// pkey is a Chilkat.PrivateKey
$pkey = $cert->ExportPrivateKey();
if (is_null($pkey)) {
    print $cert->lastErrorText() . "\n";
    exit;
}

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

$rsa = new COM("Chilkat.Rsa");

//  Any string argument automatically begins the 30-day trial.
$success = $rsa->UnlockComponent('30-day trial');
if ($success != true) {
    print 'RSA component unlock failed' . "\n";
    exit;
}

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

//  This example will sign a string, and receive the signature
//  in a hex-encoded string.  Therefore, set the encoding mode
//  to "hex":
$rsa->EncodingMode = 'hex';

//  If some other non-Chilkat application or web service is going to be verifying
//  the signature, it is important to match the byte-ordering.
//  The LittleEndian property may be set to 1
//  for little-endian byte ordering,
//  or 0  for big-endian byte ordering.
//  Microsoft apps typically use little-endian, while
//  OpenSSL and other services (such as Amazon CloudFront)
//  use big-endian.
$rsa->LittleEndian = false;

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

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

print $hexSig . "\n";

print 'Success!' . "\n";
?>