<?php
namespace Webauthn;
use CBOR\ByteStringObject;
use CBOR\MapItem;
use CBOR\MapObject;
use CBOR\NegativeIntegerObject;
use CBOR\UnsignedIntegerObject;
class U2FPublicKey
{
public static function isU2FKey($publicKey): bool
{
return $publicKey[0] === "\x04";
}
public static function createCOSEKey($publicKey): string
{
$mapObject = new MapObject([
1 => MapItem::create(
new UnsignedIntegerObject(1, null),
new UnsignedIntegerObject(2, null)
),
3 => MapItem::create(
new UnsignedIntegerObject(3, null),
new NegativeIntegerObject(6, null)
),
-1 => MapItem::create(
new NegativeIntegerObject(0, null),
new UnsignedIntegerObject(1, null)
),
-2 => MapItem::create(
new NegativeIntegerObject(1, null),
new ByteStringObject(substr($publicKey, 1, 32))
),
-3 => MapItem::create(
new NegativeIntegerObject(2, null),
new ByteStringObject(substr($publicKey, 33))
),
]);
return $mapObject->__toString();
}
}