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<?php declare(strict_types=1); |
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namespace ncryptf; |
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use InvalidArgumentException; |
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use SodiumException; |
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use ncryptf\Keypair; |
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use ncryptf\exceptions\EncryptionFailedException; |
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final class Request |
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{ |
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/** |
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* @var string |
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*/ |
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private $secretKey; |
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/** |
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* @var string |
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*/ |
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private $signatureSecretKey; |
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/** |
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* 24 byte nonce |
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* |
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* @var string |
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*/ |
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private $nonce; |
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/** |
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* Constructor |
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* |
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* @param string $secretKey The 32 byte secret key |
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* @param string $signatureSecretKey The 64 byte public keyy |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function __construct(string $secretKey, string $signatureSecretKey) |
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{ |
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if (\strlen($secretKey) !== SODIUM_CRYPTO_BOX_SECRETKEYBYTES) { |
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throw new InvalidArgumentException(sprintf("Secret key should be %d bytes.", SODIUM_CRYPTO_BOX_SECRETKEYBYTES)); |
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} |
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$this->secretKey = $secretKey; |
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if (\strlen($signatureSecretKey) !== SODIUM_CRYPTO_SIGN_SECRETKEYBYTES) { |
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throw new InvalidArgumentException(sprintf("Signing key should be %d bytes.", SODIUM_CRYPTO_SIGN_SECRETKEYBYTES)); |
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} |
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$this->signatureSecretKey = $signatureSecretKey; |
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} |
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/** |
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* Encrypts a request body |
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* |
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* @param string $request The raw HTTP request as a string |
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* @param string $publicKey 32 byte public key |
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* @param int $version Version to generate, defaults to 2 |
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* @param string $nonce Optional nonce. If not provided, a 24 byte nonce will be generated |
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* @return string |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function encrypt(string $request, string $publicKey, int $version = 2, string $nonce = null) : string |
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{ |
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$this->nonce = $nonce ?? \random_bytes(SODIUM_CRYPTO_BOX_NONCEBYTES); |
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if (\strlen($publicKey) !== SODIUM_CRYPTO_BOX_PUBLICKEYBYTES) { |
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throw new InvalidArgumentException(sprintf("Remote public key should be %d bytes.", SODIUM_CRYPTO_BOX_PUBLICKEYBYTES)); |
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} |
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if ($version === 2) { |
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$version = \pack('H*', 'DE259002'); |
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$body = $this->encryptBody($request, $publicKey, $this->nonce); |
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if (!$body) { |
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throw new EncryptionFailedException('An unexpected error occured when encrypting the message.'); |
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} |
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$iPublicKey = \sodium_crypto_box_publickey_from_secretkey($this->secretKey); |
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$sigPubKey = \sodium_crypto_sign_publickey_from_secretkey($this->signatureSecretKey); |
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$payload = $version . $this->nonce . $iPublicKey . $body . $sigPubKey . $this->sign($request); |
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$checksum = sodium_crypto_generichash($payload, $this->nonce, 64); |
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return $payload . $checksum; |
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} |
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// Version 1 payload is just a single sodium crypto box |
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return $this->encryptBody($request, $publicKey, $this->nonce); |
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} |
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/** |
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* Encrypts a request |
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* |
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* @param string $request The raw HTTP request as a string |
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* @param string $nonce Optional nonce. If not provided, a 24 byte nonce will be generated |
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* @return string |
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* |
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* @throws InvalidArguementException |
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*/ |
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private function encryptBody(string $request, string $publicKey, string $nonce) : string |
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{ |
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if (\strlen($publicKey) !== SODIUM_CRYPTO_BOX_PUBLICKEYBYTES) { |
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throw new InvalidArgumentException(sprintf("Public key should be %d bytes.", SODIUM_CRYPTO_BOX_PUBLICKEYBYTES)); |
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} |
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if (\strlen($nonce) !== SODIUM_CRYPTO_BOX_NONCEBYTES) { |
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throw new InvalidArgumentException(sprintf("Nonce should be %d bytes.", SODIUM_CRYPTO_BOX_NONCEBYTES)); |
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} |
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try { |
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$keypair = new Keypair( |
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$this->secretKey, |
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$publicKey |
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); |
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return \sodium_crypto_box( |
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$request, |
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$nonce, |
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$keypair->getSodiumKeypair() |
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); |
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} catch (SodiumException $e) { |
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throw new InvalidArgumentException($e->getMessage()); |
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} |
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} |
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/** |
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* Creates a detached signature for the keypair |
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* |
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* @param string $request |
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* @param string $secretKey |
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* @return string |
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* |
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* @throws InvalidArguementException |
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*/ |
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public function sign(string $request) : string |
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{ |
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try { |
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return \sodium_crypto_sign_detached( |
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$request, |
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$this->signatureSecretKey |
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); |
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} catch (SodiumException $e) { |
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throw new InvalidArgumentException($e->getMessage()); |
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} |
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} |
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/** |
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* Returns the nonce used |
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* |
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* @return string |
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*/ |
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public function getNonce() : string |
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{ |
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return $this->nonce; |
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} |
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} |
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ncryptf /
ncryptf-php
