(PHP Extension) RSASSA-PSS Algorithm with SHA256 Hashing

RSA encrypt a SHA256 hash with OAEP padding.

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

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<?php

include("chilkat.php");

$success = false;

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

$rsa = new CkRsa();
// Use RSA-PSS by setting PkcsPadding = false
$rsa->put_PkcsPadding(false);
// Use SHA256
$rsa->put_OaepHash('SHA-256');

$rsa->UsePrivateKey($privkey);

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

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

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

?>