(PHP Extension) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$privkey = new CkPrivateKey();

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

$rsa = new CkRsa();
// Use RSA-PSS by setting OaepPadding = true
$rsa->put_OaepPadding(true);
// Use SHA256
$rsa->put_OaepHash('SHA-256');

$rsa->ImportPrivateKeyObj($privkey);

// Generate a base64 signature.
$rsa->put_EncodingMode('base64');

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

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

?>