(PHP Extension) RSA Sign using Base64 Private Key

Signs a string using a non-encrypted RSA private key in base64 encoding. Returns the RSA signature as a base64 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 requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

$privKey = new CkPrivateKey();

$sbPem = new CkStringBuilder();
$sbPem->AppendLine('-----BEGIN RSA PRIVATE KEY-----',true);
$sbPem->AppendLine('MIIC .... j5A==',true);
$sbPem->AppendLine('-----END RSA PRIVATE KEY-----',true);

$success = $privKey->LoadPem($sbPem->getAsString());
if ($success != true) {
    print $privKey->lastErrorText() . "\n";
    exit;
}

$rsa = new CkRsa();

$success = $rsa->ImportPrivateKeyObj($privKey);
if ($success != true) {
    print $rsa->lastErrorText() . "\n";
    exit;
}

$rsa->put_EncodingMode('base64');
$strSigned = $rsa->openSslSignStringENC('12345678');
print $strSigned . "\n";

$strOriginal = $rsa->openSslVerifyStringENC($strSigned);
print $strOriginal . "\n";

?>