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<?php |
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namespace MadWizard\WebAuthn\Crypto; |
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use MadWizard\WebAuthn\Exception\UnsupportedException; |
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use MadWizard\WebAuthn\Exception\VerificationException; |
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use MadWizard\WebAuthn\Exception\WebAuthnException; |
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use MadWizard\WebAuthn\Format\ByteBuffer; |
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use MadWizard\WebAuthn\Format\CborEncoder; |
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use MadWizard\WebAuthn\Format\CborMap; |
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use MadWizard\WebAuthn\Format\DataValidator; |
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use SodiumException; |
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class OkpKey extends CoseKey |
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{ |
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public const CURVE_ED25519 = 6; |
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private const KTP_CRV = -1; |
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private const KTP_X = -2; |
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private const SUPPORTED_CURVES = [self::CURVE_ED25519]; |
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private const CURVE_KEY_LENGTH = [ |
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self::CURVE_ED25519 => 32, |
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]; |
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/** |
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* @var ByteBuffer X coordinate of key |
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*/ |
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private $x; |
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/** |
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* @var int |
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*/ |
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private $curve; |
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public function __construct(ByteBuffer $x, int $curve, int $algorithm) |
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{ |
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parent::__construct($algorithm); |
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if (!in_array($curve, self::SUPPORTED_CURVES, true)) { |
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throw new UnsupportedException('Unsupported curve'); |
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} |
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$coordLength = self::CURVE_KEY_LENGTH[$curve]; |
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if ($x->getLength() !== $coordLength) { |
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throw new WebAuthnException(sprintf('Expecting length %d for x', $coordLength)); |
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} |
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$this->x = $x; |
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$this->curve = $curve; |
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} |
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public function getCbor(): ByteBuffer |
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{ |
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$map = [ |
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self::COSE_KEY_PARAM_KTY => self::COSE_KTY_OKP, |
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self::COSE_KEY_PARAM_ALG => $this->getAlgorithm(), |
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self::KTP_CRV => $this->curve, |
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self::KTP_X => $this->x, |
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]; |
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return new ByteBuffer(CborEncoder::encodeMap(CborMap::fromArray($map))); |
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} |
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public function getCurve(): int |
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{ |
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return $this->curve; |
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} |
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public function getX(): ByteBuffer |
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{ |
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return $this->x; |
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} |
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public function verifySignature(ByteBuffer $data, ByteBuffer $signature): bool |
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{ |
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if ($this->curve === self::CURVE_ED25519) { |
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try { |
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return sodium_crypto_sign_verify_detached( |
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$signature->getBinaryString(), |
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$data->getBinaryString(), |
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$this->x->getBinaryString() |
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); |
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} catch (SodiumException $e) { |
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throw new VerificationException('Failed to verify signature: ' . $e->getMessage(), 0, $e); |
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} |
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} |
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throw new UnsupportedException('Unsupported curve'); |
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} |
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protected function algorithmSupported(int $algorithm): bool |
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{ |
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return $algorithm === CoseAlgorithm::EDDSA; |
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} |
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public function asDer(): string |
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{ |
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if ($this->curve !== self::CURVE_ED25519) { |
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throw new UnsupportedException('Unsupported curve.'); |
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} |
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return |
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Der::sequence( |
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Der::sequence( |
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Der::oid("\x2B\x65\x70") // OID 1.3.101.112 curveEd25519 (EdDSA 25519 signature algorithm) |
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) . |
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Der::bitString( |
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$this->x->getBinaryString() |
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) |
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); |
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} |
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public static function fromCborData(CborMap $data): OkpKey |
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{ |
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// Note: leading zeroes in X and Y coordinates are preserved in CBOR |
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// See RFC8152 13.1.1. Double Coordinate Curves |
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DataValidator::checkMap( |
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$data, |
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[ |
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self::COSE_KEY_PARAM_KTY => 'integer', |
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self::KTP_CRV => 'integer', |
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self::COSE_KEY_PARAM_ALG => 'integer', |
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self::KTP_X => ByteBuffer::class, |
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] |
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); |
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$curve = $data->get(self::KTP_CRV); |
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$x = $data->get(self::KTP_X); |
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$algorithm = $data->get(self::COSE_KEY_PARAM_ALG); |
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return new OkpKey($x, $curve, $algorithm); |
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} |
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} |
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madwizard-org /
webauthn-server
