(PHP ActiveX) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

Note: This example requires Chilkat v11.0.0 or greater.

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

$success = 0;

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

$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 == 0) {
    print $privkey->LastErrorText . "\n";
    exit;
}

$rsa = new COM("Chilkat.Rsa");
// Use RSA-PSS by setting OaepPadding = 1
$rsa->OaepPadding = 1;
// Use SHA256
$rsa->OaepHash = 'SHA-256';

$rsa->UsePrivateKey($privkey);

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

$sigStr = $rsa->signStringENC('String to be signed','SHA-256');
if ($rsa->LastMethodSuccess == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

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

?>