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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2017 Spomky-Labs |
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* |
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* This software may be modified and distributed under the terms |
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* of the MIT license. See the LICENSE file for details. |
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*/ |
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namespace Jose\Component\Core\Util; |
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use Assert\Assertion; |
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use Base64Url\Base64Url; |
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use FG\ASN1\ExplicitlyTaggedObject; |
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use FG\ASN1\Universal\BitString; |
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use FG\ASN1\Universal\Integer; |
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use FG\ASN1\Universal\ObjectIdentifier; |
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use FG\ASN1\Universal\OctetString; |
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use FG\ASN1\Universal\Sequence; |
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use Jose\Component\Core\JWK; |
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final class ECKey |
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{ |
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/** |
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* @var null|Sequence |
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*/ |
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private $sequence = null; |
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/** |
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* @var bool |
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*/ |
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private $private = false; |
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/** |
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* @var array |
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*/ |
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private $values = []; |
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/** |
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* ECKey constructor. |
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* |
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* @param JWK $data |
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*/ |
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private function __construct(JWK $data) |
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{ |
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$this->sequence = new Sequence(); |
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$this->loadJWK($data->all()); |
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$this->private = isset($this->values['d']); |
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} |
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/** |
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* @param JWK $jwk |
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* |
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* @return ECKey |
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*/ |
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public static function createFromJWK(JWK $jwk): ECKey |
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{ |
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return new self($jwk); |
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} |
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/** |
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* @param array $jwk |
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*/ |
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private function loadJWK(array $jwk) |
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{ |
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Assertion::true(array_key_exists('kty', $jwk), 'JWK is not an Elliptic Curve key'); |
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Assertion::eq($jwk['kty'], 'EC', 'JWK is not an Elliptic Curve key'); |
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Assertion::true(array_key_exists('crv', $jwk), 'Curve parameter is missing'); |
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Assertion::true(array_key_exists('x', $jwk), 'Point parameters are missing'); |
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Assertion::true(array_key_exists('y', $jwk), 'Point parameters are missing'); |
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$this->values = $jwk; |
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if (array_key_exists('d', $jwk)) { |
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$this->initPrivateKey(); |
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} else { |
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$this->initPublicKey(); |
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} |
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} |
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private function initPublicKey() |
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{ |
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$oid_sequence = new Sequence(); |
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$oid_sequence->addChild(new ObjectIdentifier('1.2.840.10045.2.1')); |
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$oid_sequence->addChild(new ObjectIdentifier($this->getOID($this->values['crv']))); |
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$this->sequence->addChild($oid_sequence); |
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$bits = '04'; |
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$bits .= bin2hex(Base64Url::decode($this->values['x'])); |
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$bits .= bin2hex(Base64Url::decode($this->values['y'])); |
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$this->sequence->addChild(new BitString($bits)); |
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} |
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private function initPrivateKey() |
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{ |
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$this->sequence->addChild(new Integer(1)); |
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$this->sequence->addChild(new OctetString(bin2hex(Base64Url::decode($this->values['d'])))); |
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$oid = new ObjectIdentifier($this->getOID($this->values['crv'])); |
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$this->sequence->addChild(new ExplicitlyTaggedObject(0, $oid)); |
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$bits = '04'; |
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$bits .= bin2hex(Base64Url::decode($this->values['x'])); |
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$bits .= bin2hex(Base64Url::decode($this->values['y'])); |
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$bit = new BitString($bits); |
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$this->sequence->addChild(new ExplicitlyTaggedObject(1, $bit)); |
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} |
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/** |
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* @return string |
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*/ |
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public function toPEM(): string |
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{ |
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$result = '-----BEGIN '.($this->private ? 'EC PRIVATE' : 'PUBLIC').' KEY-----'.PHP_EOL; |
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$result .= chunk_split(base64_encode($this->sequence->getBinary()), 64, PHP_EOL); |
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$result .= '-----END '.($this->private ? 'EC PRIVATE' : 'PUBLIC').' KEY-----'.PHP_EOL; |
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return $result; |
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} |
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/** |
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* @param $curve |
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* |
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* @return string |
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*/ |
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private function getOID(string $curve): string |
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{ |
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$curves = $this->getSupportedCurves(); |
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$oid = array_key_exists($curve, $curves) ? $curves[$curve] : null; |
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Assertion::notNull($oid, 'Unsupported curve'); |
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return $oid; |
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} |
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/** |
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* @param string $oid |
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* |
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* @return string |
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*/ |
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private function getCurve(string $oid): string |
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{ |
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$curves = $this->getSupportedCurves(); |
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$curve = array_search($oid, $curves, true); |
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Assertion::string($curve, 'Unsupported OID'); |
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return $curve; |
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} |
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/** |
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* @return array |
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*/ |
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private function getSupportedCurves(): array |
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{ |
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return [ |
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'P-256' => '1.2.840.10045.3.1.7', |
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'P-384' => '1.3.132.0.34', |
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'P-521' => '1.3.132.0.35', |
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]; |
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} |
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} |
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Spomky-Labs /
jose
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