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.

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use chilkat();



#  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 chilkat::CkCertStore();

#  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 CkCert
$cert = $certStore->FindCertBySubject("Chilkat Software, Inc.");
if ($cert eq null ) {
    print $certStore->lastErrorText() . "\n";
    exit;
}

# pkey is a CkPrivateKey
$pkey = $cert->ExportPrivateKey();
if ($pkey eq null ) {
    print $cert->lastErrorText() . "\n";
    exit;
}

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

$rsa = new chilkat::CkRsa();

#  Any string argument automatically begins the 30-day trial.
$success = $rsa->UnlockComponent("30-day trial");
if ($success != 1) {
    print "RSA component unlock failed" . "\n";
    exit;
}

#  Import the private key into the RSA component:
$success = $rsa->ImportPrivateKey($pkeyXml);
if ($success != 1) {
    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->put_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->put_LittleEndian(0);

$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 . "\r\n";

print "Success!" . "\n";