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<?php
declare(strict_types=1);
namespace Webauthn;
use CBOR\ByteStringObject;
use CBOR\MapItem;
use CBOR\MapObject;
use CBOR\NegativeIntegerObject;
use CBOR\UnsignedIntegerObject;
use Cose\Algorithms;
use Cose\Key\Ec2Key;
class U2FPublicKey
{
public static function isU2FKey(string $publicKey): bool
{
return $publicKey[0] === "\x04" && mb_strlen($publicKey, '8bit') === 65;
}
public static function convertToCoseKey(string $publicKey): string
{
return MapObject::create([
MapItem::create(
UnsignedIntegerObject::create(Ec2Key::TYPE),
UnsignedIntegerObject::create(Ec2Key::TYPE_EC2)
),
MapItem::create(
UnsignedIntegerObject::create(Ec2Key::ALG),
NegativeIntegerObject::create(Algorithms::COSE_ALGORITHM_ES256)
),
MapItem::create(
NegativeIntegerObject::create(Ec2Key::DATA_CURVE),
UnsignedIntegerObject::create(Ec2Key::CURVE_P256)
),
MapItem::create(
NegativeIntegerObject::create(Ec2Key::DATA_X),
ByteStringObject::create(mb_substr($publicKey, 1, 32, '8bit'))
),
MapItem::create(
NegativeIntegerObject::create(Ec2Key::DATA_Y),
ByteStringObject::create(mb_substr($publicKey, 33, null, '8bit'))
),
])->__toString();
}
}