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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) 2014-2019 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\KeyManagement\KeyConverter; |
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use Base64Url\Base64Url; |
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use InvalidArgumentException; |
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use Jose\Component\Core\JWK; |
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use Jose\Component\Core\Util\BigInteger; |
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use RuntimeException; |
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/** |
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* @internal |
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*/ |
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class RSAKey |
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{ |
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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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* RSAKey constructor. |
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*/ |
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private function __construct(array $data) |
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{ |
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$this->loadJWK($data); |
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} |
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/** |
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* @return RSAKey |
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*/ |
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public static function createFromKeyDetails(array $details): self |
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{ |
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$values = ['kty' => 'RSA']; |
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$keys = [ |
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'n' => 'n', |
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'e' => 'e', |
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'd' => 'd', |
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'p' => 'p', |
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'q' => 'q', |
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'dp' => 'dmp1', |
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'dq' => 'dmq1', |
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'qi' => 'iqmp', |
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]; |
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foreach ($details as $key => $value) { |
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if (\in_array($key, $keys, true)) { |
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$value = Base64Url::encode($value); |
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$values[array_search($key, $keys, true)] = $value; |
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} |
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} |
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return new self($values); |
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} |
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/** |
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* @return RSAKey |
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*/ |
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public static function createFromPEM(string $pem): self |
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{ |
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if (!\extension_loaded('openssl')) { |
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throw new RuntimeException('Please install the OpenSSL extension'); |
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} |
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$res = openssl_pkey_get_private($pem); |
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if (false === $res) { |
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$res = openssl_pkey_get_public($pem); |
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} |
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if (false === $res) { |
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throw new InvalidArgumentException('Unable to load the key.'); |
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} |
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$details = openssl_pkey_get_details($res); |
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openssl_free_key($res); |
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if (!\is_array($details) || !isset($details['rsa'])) { |
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throw new InvalidArgumentException('Unable to load the key.'); |
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} |
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return self::createFromKeyDetails($details['rsa']); |
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} |
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/** |
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* @return RSAKey |
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*/ |
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public static function createFromJWK(JWK $jwk): self |
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{ |
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return new self($jwk->all()); |
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} |
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public function isPublic(): bool |
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{ |
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return !\array_key_exists('d', $this->values); |
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} |
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/** |
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* @param RSAKey $private |
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* |
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* @return RSAKey |
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*/ |
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public static function toPublic(self $private): self |
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{ |
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$data = $private->toArray(); |
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$keys = ['p', 'd', 'q', 'dp', 'dq', 'qi']; |
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foreach ($keys as $key) { |
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if (\array_key_exists($key, $data)) { |
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unset($data[$key]); |
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} |
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} |
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return new self($data); |
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} |
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public function toArray(): array |
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{ |
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return $this->values; |
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} |
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public function toJwk(): JWK |
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{ |
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return new JWK($this->values); |
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} |
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/** |
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* This method will try to add Chinese Remainder Theorem (CRT) parameters. |
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* With those primes, the decryption process is really fast. |
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*/ |
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public function optimize(): void |
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{ |
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if (\array_key_exists('d', $this->values)) { |
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$this->populateCRT(); |
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} |
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} |
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private function loadJWK(array $jwk): void |
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{ |
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if (!\array_key_exists('kty', $jwk)) { |
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throw new InvalidArgumentException('The key parameter "kty" is missing.'); |
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} |
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if ('RSA' !== $jwk['kty']) { |
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throw new InvalidArgumentException('The JWK is not a RSA key.'); |
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} |
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$this->values = $jwk; |
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} |
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/** |
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* This method adds Chinese Remainder Theorem (CRT) parameters if primes 'p' and 'q' are available. |
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* If 'p' and 'q' are missing, they are computed and added to the key data. |
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*/ |
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private function populateCRT(): void |
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{ |
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if (!\array_key_exists('p', $this->values) && !\array_key_exists('q', $this->values)) { |
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$d = BigInteger::createFromBinaryString(Base64Url::decode($this->values['d'])); |
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$e = BigInteger::createFromBinaryString(Base64Url::decode($this->values['e'])); |
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$n = BigInteger::createFromBinaryString(Base64Url::decode($this->values['n'])); |
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list($p, $q) = $this->findPrimeFactors($d, $e, $n); |
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$this->values['p'] = Base64Url::encode($p->toBytes()); |
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$this->values['q'] = Base64Url::encode($q->toBytes()); |
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} |
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if (\array_key_exists('dp', $this->values) && \array_key_exists('dq', $this->values) && \array_key_exists('qi', $this->values)) { |
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return; |
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} |
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$one = BigInteger::createFromDecimal(1); |
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$d = BigInteger::createFromBinaryString(Base64Url::decode($this->values['d'])); |
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$p = BigInteger::createFromBinaryString(Base64Url::decode($this->values['p'])); |
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$q = BigInteger::createFromBinaryString(Base64Url::decode($this->values['q'])); |
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$this->values['dp'] = Base64Url::encode($d->mod($p->subtract($one))->toBytes()); |
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$this->values['dq'] = Base64Url::encode($d->mod($q->subtract($one))->toBytes()); |
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$this->values['qi'] = Base64Url::encode($q->modInverse($p)->toBytes()); |
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} |
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/** |
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* @return BigInteger[] |
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*/ |
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private function findPrimeFactors(BigInteger $d, BigInteger $e, BigInteger $n): array |
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{ |
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$zero = BigInteger::createFromDecimal(0); |
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$one = BigInteger::createFromDecimal(1); |
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$two = BigInteger::createFromDecimal(2); |
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$k = $d->multiply($e)->subtract($one); |
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if ($k->isEven()) { |
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$r = $k; |
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$t = $zero; |
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do { |
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$r = $r->divide($two); |
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$t = $t->add($one); |
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} while ($r->isEven()); |
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$found = false; |
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$y = null; |
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for ($i = 1; $i <= 100; ++$i) { |
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$g = BigInteger::random($n->subtract($one)); |
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$y = $g->modPow($r, $n); |
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if ($y->equals($one) || $y->equals($n->subtract($one))) { |
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continue; |
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} |
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for ($j = $one; $j->lowerThan($t->subtract($one)); $j = $j->add($one)) { |
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$x = $y->modPow($two, $n); |
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if ($x->equals($one)) { |
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$found = true; |
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break; |
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} |
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if ($x->equals($n->subtract($one))) { |
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continue; |
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} |
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$y = $x; |
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} |
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$x = $y->modPow($two, $n); |
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if ($x->equals($one)) { |
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$found = true; |
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break; |
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} |
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} |
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if (null === $y) { |
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throw new InvalidArgumentException('Unable to find prime factors.'); |
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} |
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if (true === $found) { |
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$p = $y->subtract($one)->gcd($n); |
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$q = $n->divide($p); |
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return [$p, $q]; |
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} |
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} |
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throw new InvalidArgumentException('Unable to find prime factors.'); |
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} |
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} |
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: