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<?php declare(strict_types=1); namespace Lcobucci\JWT\Signer; use Lcobucci\JWT\Signer; use OpenSSLAsymmetricKey; use function array_key_exists; use function assert; use function is_array; use function is_bool; use function is_int; use function openssl_error_string; use function openssl_pkey_get_details; use function openssl_pkey_get_private; use function openssl_pkey_get_public; use function openssl_sign; use function openssl_verify; use const OPENSSL_KEYTYPE_DH; use const OPENSSL_KEYTYPE_DSA; use const OPENSSL_KEYTYPE_EC; use const OPENSSL_KEYTYPE_RSA; use const PHP_EOL; abstract class OpenSSL implements Signer { protected const KEY_TYPE_MAP = [ OPENSSL_KEYTYPE_RSA => 'RSA', OPENSSL_KEYTYPE_DSA => 'DSA', OPENSSL_KEYTYPE_DH => 'DH', OPENSSL_KEYTYPE_EC => 'EC', ]; /** * @return non-empty-string * * @throws CannotSignPayload * @throws InvalidKeyProvided */ final protected function createSignature( string $pem, string $passphrase, string $payload, ): string { $key = $this->getPrivateKey($pem, $passphrase); $signature = ''; if (! openssl_sign($payload, $signature, $key, $this->algorithm())) { throw CannotSignPayload::errorHappened($this->fullOpenSSLErrorString()); } return $signature; } /** @throws CannotSignPayload */ private function getPrivateKey(string $pem, string $passphrase): OpenSSLAsymmetricKey { return $this->validateKey(openssl_pkey_get_private($pem, $passphrase)); } /** @throws InvalidKeyProvided */ final protected function verifySignature( string $expected, string $payload, string $pem, ): bool { $key = $this->getPublicKey($pem); $result = openssl_verify($payload, $expected, $key, $this->algorithm()); return $result === 1; } /** @throws InvalidKeyProvided */ private function getPublicKey(string $pem): OpenSSLAsymmetricKey { return $this->validateKey(openssl_pkey_get_public($pem)); } /** * Raises an exception when the key type is not the expected type * * @throws InvalidKeyProvided */ private function validateKey(OpenSSLAsymmetricKey|bool $key): OpenSSLAsymmetricKey { if (is_bool($key)) { throw InvalidKeyProvided::cannotBeParsed($this->fullOpenSSLErrorString()); } $details = openssl_pkey_get_details($key); assert(is_array($details)); assert(array_key_exists('bits', $details)); assert(is_int($details['bits'])); assert(array_key_exists('type', $details)); assert(is_int($details['type'])); $this->guardAgainstIncompatibleKey($details['type'], $details['bits']); return $key; } private function fullOpenSSLErrorString(): string { $error = ''; while ($msg = openssl_error_string()) { $error .= PHP_EOL . '* ' . $msg; } return $error; } /** @throws InvalidKeyProvided */ abstract protected function guardAgainstIncompatibleKey(int $type, int $lengthInBits): void; /** * Returns which algorithm to be used to create/verify the signature (using OpenSSL constants) * * @internal */ abstract public function algorithm(): int; }
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