(PHP ActiveX) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

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.

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

// Load the private key object from a PEM file.
// (To load from a PEM string, call LoadPem instead.)
$success = $privkey->LoadPemFile('somePath/myPrivateKey.pem');
if ($success != 1) {
    print $privkey->LastErrorText . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Rsa')
$rsa = new COM("Chilkat.Rsa");
// Use RSA-PSS by setting OaepPadding = 1
$rsa->OaepPadding = 1;
// Use SHA256
$rsa->OaepHash = 'SHA-256';

$rsa->ImportPrivateKeyObj($privkey);

// Generate a base64 signature.
$rsa->EncodingMode = 'base64';

$sigStr = $rsa->signStringENC('String to be signed','SHA-256');
if ($rsa->LastMethodSuccess != 1) {
    print $rsa->LastErrorText . "\n";
    exit;
}

print 'Signature: ' . $sigStr . "\n";

?>