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<?php |
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namespace Plinker\Core; |
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use phpseclib\Crypt\AES; |
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use Plinker\Base91\Base91; |
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/** |
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* Payload signing class. |
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*/ |
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class Signer |
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{ |
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/** |
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* @var |
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*/ |
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private $publicKey; |
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/** |
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* @var |
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*/ |
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private $privateKey; |
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/** |
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* @var |
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*/ |
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private $encrypt; |
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/** |
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* @var |
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*/ |
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private $encryption; |
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/** |
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* @var |
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*/ |
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private $packet_state; |
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/** |
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* Construct. |
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* |
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* @param string $publicKey |
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* @param string $privateKey |
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*/ |
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public function __construct($publicKey = null, $privateKey = null, $encrypt = true) |
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{ |
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$this->publicKey = $publicKey; |
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$this->privateKey = $privateKey; |
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$this->encrypt = $encrypt; |
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// set encryption |
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if ($this->encrypt) { |
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$this->encryption = new AES(/* ECB */ 1); |
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$this->encryption->setPassword($this->privateKey); |
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} |
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} |
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/** |
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* Payload encode/encrypt |
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* Encodes and signs the payload packet. |
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* |
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* @param array $signer |
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* @return array |
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*/ |
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public function encode($packet = []) |
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{ |
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// serialize response data |
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if (!empty($packet['response'])) { |
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$packet['response'] = serialize($packet['response']); |
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} |
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// set time into packet |
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$packet['time'] = microtime(true); |
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$data = serialize($packet); |
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$packet = [ |
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'data' => ($this->encrypt ? Base91::encode($this->encryption->encrypt($data)) : $data), |
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'public_key' => $this->publicKey, |
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'time' => microtime(true), |
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'encrypt' => $this->encrypt, |
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]; |
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// sign packet |
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$packet['token'] = hash_hmac( |
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'sha256', |
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$packet['data'], |
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$this->privateKey |
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); |
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return $packet; |
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} |
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/** |
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* Payload decode/decrypt |
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* Validates and decodes payload packet. |
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* |
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* @param array $signer |
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* @return mixed |
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*/ |
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public function decode($packet = []) |
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{ |
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// failed packet validation |
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if (!$this->authenticatePacket($packet)) { |
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// unset not needed response vars |
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unset($packet['data']); |
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unset($packet['public_key']); |
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unset($packet['token']); |
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unset($packet['encrypt']); |
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$packet['response'] = serialize(['error' => $this->packet_state]); |
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return $packet; |
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} |
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if ($this->encrypt) { |
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$packet['data'] = $this->encryption->decrypt(Base91::decode($packet['data'])); |
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} |
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return unserialize($packet['data']); |
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} |
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/** |
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* Authenticate payload packet. |
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* |
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* @param array $packet |
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* @return bool |
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*/ |
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public function authenticatePacket($packet = []) |
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{ |
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$this->packet_state = 'valid'; |
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// public key required |
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if (empty($packet['public_key'])) { |
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$this->packet_state = 'public key required'; |
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return false; |
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} |
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// token required |
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if (empty($packet['token'])) { |
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$this->packet_state = 'token required'; |
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return false; |
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} |
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// data required |
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if (empty($packet['data'])) { |
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$this->packet_state = 'empty data'; |
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return false; |
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} |
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// authenticate packet signature/token |
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if (hash_hmac( |
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'sha256', |
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$packet['data'], |
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$this->privateKey |
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) == $packet['token']) { |
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return true; |
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} else { |
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$this->packet_state = 'unauthorised'; |
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return false; |
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} |
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} |
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} |
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plinker-rpc /
core
