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<?php declare(strict_types=1); namespace Jose\Component\Encryption\Algorithm\KeyEncryption; use InvalidArgumentException; use Jose\Component\Core\JWK; use Jose\Component\Core\Util\RSAKey; use Jose\Component\Encryption\Algorithm\KeyEncryption\Util\RSACrypt; use function in_array; abstract class RSA implements KeyEncryption { public function allowedKeyTypes(): array { return ['RSA']; } /** * @param array<string, mixed> $completeHeader * @param array<string, mixed> $additionalHeader */ public function encryptKey(JWK $key, string $cek, array $completeHeader, array &$additionalHeader): string { $this->checkKey($key); $pub = RSAKey::toPublic(RSAKey::createFromJWK($key)); return RSACrypt::encrypt($pub, $cek, $this->getEncryptionMode(), $this->getHashAlgorithm()); } /** * @param array<string, mixed> $header */ public function decryptKey(JWK $key, string $encrypted_cek, array $header): string { $this->checkKey($key); if (! $key->has('d')) { throw new InvalidArgumentException('The key is not a private key'); } $priv = RSAKey::createFromJWK($key); return RSACrypt::decrypt($priv, $encrypted_cek, $this->getEncryptionMode(), $this->getHashAlgorithm()); } public function getKeyManagementMode(): string { return self::MODE_ENCRYPT; } protected function checkKey(JWK $key): void { if (! in_array($key->get('kty'), $this->allowedKeyTypes(), true)) { throw new InvalidArgumentException('Wrong key type.'); } } abstract protected function getEncryptionMode(): int; abstract protected function getHashAlgorithm(): ?string; }
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