(PHP ActiveX) 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.

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

$privKey = new COM("Chilkat.PrivateKey");

$sbPem = new COM("Chilkat.StringBuilder");
$sbPem->AppendLine('-----BEGIN RSA PRIVATE KEY-----',1);
$sbPem->AppendLine('MIIC .... j5A==',1);
$sbPem->AppendLine('-----END RSA PRIVATE KEY-----',1);

$success = $privKey->LoadPem($sbPem->getAsString());
if ($success == 0) {
    print $privKey->LastErrorText . "\n";
    exit;
}

$rsa = new COM("Chilkat.Rsa");

$success = $rsa->UsePrivateKey($privKey);
if ($success == 0) {
    print $rsa->LastErrorText . "\n";
    exit;
}

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

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

?>