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<?php
namespace Namshi\JOSE\Signer\OpenSSL;
use InvalidArgumentException;
use Namshi\JOSE\Signer\SignerInterface;
/**
* 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.');
}
return (bool) openssl_verify($input, $signature, $keyResource, $this->getHashingAlgorithm());
}
/**
* 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 $key;
}
return openssl_pkey_get_public($key) ? : openssl_pkey_get_private($key, $password);
}
/**
* Check if the key is supported by this signer.
*
* @param resource $key Public or private key
* @return boolean
*/
protected function supportsKey($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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