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<?php |
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declare(strict_types = 1); |
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namespace Sop\JWX\JWK\EC; |
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use Sop\CryptoEncoding\PEM; |
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use Sop\CryptoTypes\Asymmetric\EC\ECConversion; |
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use Sop\CryptoTypes\Asymmetric\EC\ECPublicKey; |
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use Sop\JWX\JWK\Asymmetric\PublicKeyJWK; |
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use Sop\JWX\JWK\Parameter\CurveParameter; |
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use Sop\JWX\JWK\Parameter\JWKParameter; |
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use Sop\JWX\JWK\Parameter\KeyTypeParameter; |
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use Sop\JWX\JWK\Parameter\XCoordinateParameter; |
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use Sop\JWX\JWK\Parameter\YCoordinateParameter; |
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/** |
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* Class representing elliptic curve public key as a JWK. |
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* |
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* @see https://tools.ietf.org/html/rfc7517#section-4 |
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* @see https://tools.ietf.org/html/rfc7518#section-6.2 |
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* @see https://tools.ietf.org/html/rfc7518#section-6.2.1 |
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*/ |
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class ECPublicKeyJWK extends PublicKeyJWK |
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{ |
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/** |
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* Parameter names managed by this class. |
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* |
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* @var string[] |
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*/ |
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const MANAGED_PARAMS = [ |
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JWKParameter::PARAM_KEY_TYPE, |
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JWKParameter::PARAM_CURVE, |
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JWKParameter::PARAM_X_COORDINATE, |
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]; |
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/** |
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* Constructor. |
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* |
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* @param JWKParameter ...$params |
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* |
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* @throws \UnexpectedValueException If missing required parameter |
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*/ |
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public function __construct(JWKParameter ...$params) |
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{ |
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parent::__construct(...$params); |
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foreach (self::MANAGED_PARAMS as $name) { |
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if (!$this->has($name)) { |
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throw new \UnexpectedValueException( |
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"Missing '{$name}' parameter."); |
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} |
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} |
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if (KeyTypeParameter::TYPE_EC !== $this->keyTypeParameter()->value()) { |
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throw new \UnexpectedValueException('Invalid key type.'); |
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} |
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} |
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/** |
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* Initialize from ECPublicKey. |
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* |
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* @param ECPublicKey $pk |
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* |
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* @throws \UnexpectedValueException |
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* |
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* @return self |
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*/ |
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public static function fromECPublicKey(ECPublicKey $pk): self |
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{ |
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if (!$pk->hasNamedCurve()) { |
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throw new \UnexpectedValueException('No curve name.'); |
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} |
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$curve = CurveParameter::fromOID($pk->namedCurve()); |
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[$x, $y] = $pk->curvePointOctets(); |
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$xcoord = XCoordinateParameter::fromString($x); |
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$ycoord = YCoordinateParameter::fromString($y); |
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$key_type = new KeyTypeParameter(KeyTypeParameter::TYPE_EC); |
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return new self($key_type, $curve, $xcoord, $ycoord); |
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} |
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/** |
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* Initialize from PEM. |
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* |
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* @param PEM $pem |
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* |
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* @return self |
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*/ |
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public static function fromPEM(PEM $pem): self |
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{ |
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return self::fromECPublicKey(ECPublicKey::fromPEM($pem)); |
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} |
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/** |
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* Convert EC public key to PEM. |
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* |
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* @return PEM |
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*/ |
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public function toPEM(): PEM |
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{ |
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$curve_oid = CurveParameter::nameToOID($this->curveParameter()->value()); |
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$x = ECConversion::octetsToNumber( |
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$this->XCoordinateParameter()->coordinateOctets()); |
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$y = ECConversion::octetsToNumber( |
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$this->YCoordinateParameter()->coordinateOctets()); |
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$ec = ECPublicKey::fromCoordinates($x, $y, $curve_oid); |
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return $ec->publicKeyInfo()->toPEM(); |
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} |
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} |
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sop /
jwx
