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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(); } }
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