(PHP Extension) RSA Sign utf-8 Byte Representation of String

Demontstrates how to sign the utf-8 byte representation of a string.

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.

// Load an RSA private key for signing.
$privKey = new CkPrivateKey();
$success = $privKey->LoadEncryptedPemFile('qa_data/pem/rsa_passwd.pem','passwd');
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();
$rsa->ImportPrivateKeyObj($privKey);

$originalData = 'This is the string to be hashed an RSA signed.';

// Indicate that we want the utf-8 byte representation of the string to be signed
$rsa->put_Charset('utf-8');

// We want the RSA signature in base64 format
$rsa->put_EncodingMode('base64');

$sigBase64 = $rsa->signStringENC($originalData,'sha256');
print $sigBase64 . "\n";

?>