static function convertRSA($modulus, $exponent)
{
/* make an ASN publicKeyInfo */
$exponentEncoding = XMLSecurityKey::makeAsnSegment(0x2, $exponent);
$modulusEncoding = XMLSecurityKey::makeAsnSegment(0x2, $modulus);
$sequenceEncoding = XMLSecurityKey::makeAsnSegment(0x30, $modulusEncoding . $exponentEncoding);
$bitstringEncoding = XMLSecurityKey::makeAsnSegment(0x3, $sequenceEncoding);
$rsaAlgorithmIdentifier = pack("H*", "300D06092A864886F70D0101010500");
$publicKeyInfo = XMLSecurityKey::makeAsnSegment(0x30, $rsaAlgorithmIdentifier . $bitstringEncoding);
/* encode the publicKeyInfo in base64 and add PEM brackets */
$publicKeyInfoBase64 = base64_encode($publicKeyInfo);
$encoding = "-----BEGIN PUBLIC KEY-----\n";
$offset = 0;
while ($segment = substr($publicKeyInfoBase64, $offset, 64)) {
$encoding = $encoding . $segment . "\n";
$offset += 64;
}
return $encoding . "-----END PUBLIC KEY-----\n";
}
