(PHP ActiveX) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

See more RSA Examples

Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

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

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

// Load the .pfx/.p12
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Pfx')
$pfx = new COM("Chilkat.Pfx");
$success = $pfx->LoadPfxFile('qa_data/pfx/myKey.p12','myPassword');
if ($success != 1) {
    print $pfx->LastErrorText . "\n";
    exit;
}

// Get the default private key.
// privKey is a Chilkat.PrivateKey
$privKey = $pfx->GetPrivateKey(0);
if ($pfx->LastMethodSuccess != 1) {
    print $pfx->LastErrorText . "\n";
    exit;
}

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

    exit;
}

// Get the signature in base64
$rsa->EncodingMode = 'base64';

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

// Sign the string using the sha256 hash algorithm.
// Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
$base64Sig = $rsa->signStringENC($strData,'sha256');

print $base64Sig . "\n";

print 'Success!' . "\n";

?>