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<?php |
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declare(strict_types = 1); |
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namespace Sop\JWX\JWK\Parameter; |
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use Sop\JWX\Parameter\Feature\StringParameterValue; |
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/** |
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* Implements 'Curve' parameter. |
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* |
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* @see https://tools.ietf.org/html/rfc7518#section-6.2.1.1 |
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*/ |
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class CurveParameter extends JWKParameter |
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{ |
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use StringParameterValue; |
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/** |
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* P-256 Curve. |
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* |
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* @var string |
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*/ |
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public const CURVE_P256 = 'P-256'; |
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/** |
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* P-384 Curve. |
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* |
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* @var string |
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*/ |
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public const CURVE_P384 = 'P-384'; |
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/** |
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* P-521 Curve. |
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* |
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* @var string |
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*/ |
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public const CURVE_P521 = 'P-521'; |
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/** |
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* Mapping from curve OID to curve name. |
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* |
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* @internal |
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* |
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* @var array |
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*/ |
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public const MAP_OID_TO_CURVE = [ |
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'1.2.840.10045.3.1.7' => self::CURVE_P256, |
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'1.3.132.0.34' => self::CURVE_P384, |
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'1.3.132.0.35' => self::CURVE_P521, |
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]; |
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/** |
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* Mapping from curve name to bit size. |
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* |
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* @internal |
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* |
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* @var array |
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*/ |
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public const MAP_CURVE_TO_SIZE = [ |
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self::CURVE_P256 => 256, |
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self::CURVE_P384 => 384, |
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self::CURVE_P521 => 521, |
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]; |
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/** |
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* Constructor. |
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* |
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* @param string $curve Curve name |
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*/ |
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public function __construct(string $curve) |
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{ |
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parent::__construct(self::PARAM_CURVE, $curve); |
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} |
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/** |
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* Initialize from curve OID. |
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* |
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* @param string $oid Object identifier in dotted format |
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* |
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* @throws \UnexpectedValueException If the curve is not supported |
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*/ |
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public static function fromOID(string $oid): self |
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{ |
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if (!array_key_exists($oid, self::MAP_OID_TO_CURVE)) { |
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throw new \UnexpectedValueException("OID {$oid} not supported."); |
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} |
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$curve = self::MAP_OID_TO_CURVE[$oid]; |
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return new self($curve); |
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} |
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/** |
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* Get key size in bits for the curve. |
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* |
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* @throws \UnexpectedValueException |
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*/ |
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public function keySizeBits(): int |
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{ |
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if (!array_key_exists($this->_value, self::MAP_CURVE_TO_SIZE)) { |
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throw new \UnexpectedValueException( |
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'Curve ' . $this->_value . ' not supported.'); |
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} |
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return self::MAP_CURVE_TO_SIZE[$this->_value]; |
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} |
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/** |
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* Get the curve OID by curve name. |
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* |
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* @param string $name Curve parameter name |
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* |
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* @throws \UnexpectedValueException If the curve is not supported |
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* |
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* @return string OID in dotted format |
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*/ |
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public static function nameToOID(string $name): string |
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{ |
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static $reverseMap; |
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if (!isset($reverseMap)) { |
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$reverseMap = array_flip(self::MAP_OID_TO_CURVE); |
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} |
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if (!isset($reverseMap[$name])) { |
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throw new \UnexpectedValueException("Curve {$name} not supported."); |
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} |
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return $reverseMap[$name]; |
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} |
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} |
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sop /
jwx
