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<?php namespace Namshi\JOSE\Signer\OpenSSL; use InvalidArgumentException; use Namshi\JOSE\Signer\SignerInterface; use RuntimeException; /** * Class responsible to sign inputs with the a public key algorithm, after hashing it. */ abstract class PublicKey implements SignerInterface { /** * {@inheritdoc} */ public function sign($input, $key, $password = null) { $keyResource = $this->getKeyResource($key, $password); if (!$this->supportsKey($keyResource)) { throw new InvalidArgumentException('Invalid key supplied.'); } $signature = null; openssl_sign($input, $signature, $keyResource, $this->getHashingAlgorithm()); return $signature; } /** * {@inheritdoc} */ public function verify($key, $signature, $input) { $keyResource = $this->getKeyResource($key); if (!$this->supportsKey($keyResource)) { throw new InvalidArgumentException('Invalid key supplied.'); } $result = openssl_verify($input, $signature, $keyResource, $this->getHashingAlgorithm()); if ($result === -1) { throw new RuntimeException('Unknown error during verification.'); } return (bool) $result; } /** * Converts a string representation of a key into an OpenSSL resource. * * @param string|resource $key * @param string $password * * @return resource OpenSSL key resource */ protected function getKeyResource($key, $password = null) { if (is_resource($key)) { return $key; } $resource = openssl_pkey_get_public($key) ?: openssl_pkey_get_private($key, $password); if ($resource === false) { throw new RuntimeException('Could not read key resource: ' . openssl_error_string()); } return $resource; } /** * Check if the key is supported by this signer. * * @param resource $key Public or private key * * @return bool */ protected function supportsKey($key) { // OpenSSL 0.9.8+ $keyDetails = openssl_pkey_get_details($key); return isset($keyDetails['type']) ? $this->getSupportedPrivateKeyType() === $keyDetails['type'] : false; } /** * Returns the hashing algorithm used in this signer. * * @return string */ abstract protected function getHashingAlgorithm(); /** * Returns the private key type supported in this signer. * * @return string */ abstract protected function getSupportedPrivateKeyType(); }
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