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<?php |
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/** |
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* Class CryptoSodium |
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* |
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* @filesource CryptoSodium.php |
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* @created 01.04.2016 |
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* @package chillerlan\Threema\Crypto |
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* @author Smiley <[email protected]> |
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* @copyright 2016 Smiley |
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* @license MIT |
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*/ |
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namespace chillerlan\Threema\Crypto; |
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class CryptoSodium extends CryptoAbstract{ |
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/** |
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* @inheritdoc |
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*/ |
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public function version():string{ |
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return 'libsodium '.\Sodium\version_string(); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function bin2hex(string $bin):string{ |
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return \Sodium\bin2hex($bin); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function hex2bin(string $hex):string{ |
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return \Sodium\hex2bin($hex); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getRandomBytes(int $length):string{ |
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return \Sodium\randombytes_buf($length); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getKeypair():array { |
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$keypair = \Sodium\crypto_box_keypair(); |
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$pair = [ |
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'public' => $this->bin2hex(\Sodium\crypto_box_publickey($keypair)), |
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'private' => $this->bin2hex(\Sodium\crypto_box_secretkey($keypair)), |
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]; |
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\Sodium\memzero($keypair); |
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return $pair; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function createBox(string $data, string $privateKey, string $publicKey):array { |
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if(empty($data)){ |
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throw new CryptoException('invalid data'); |
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} |
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if(!preg_match('/^[a-f\d]{128}$/i', $privateKey.$publicKey)){ |
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throw new CryptoException('invalid keypair'); |
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} |
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$keypair = \Sodium\crypto_box_keypair_from_secretkey_and_publickey($this->hex2bin($privateKey), $this->hex2bin($publicKey)); |
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\Sodium\memzero($privateKey); |
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\Sodium\memzero($publicKey); |
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$nonce = $this->getRandomBytes(\Sodium\CRYPTO_BOX_NONCEBYTES); |
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$box = \Sodium\crypto_box($data, $nonce, $keypair); |
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\Sodium\memzero($keypair); |
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\Sodium\memzero($data); |
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$encrypted = ['box' => $this->bin2hex($box), 'nonce' => $this->bin2hex($nonce)]; |
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\Sodium\memzero($nonce); |
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\Sodium\memzero($box); |
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return $encrypted; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function openBox(string $box, string $nonce, string $privateKey, string $publicKey):string{ |
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$keypair = \Sodium\crypto_box_keypair_from_secretkey_and_publickey( |
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$this->hex2bin($privateKey), |
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$this->hex2bin($publicKey) |
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); |
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\Sodium\memzero($privateKey); |
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\Sodium\memzero($publicKey); |
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$data = \Sodium\crypto_box_open($this->hex2bin($box), $this->hex2bin($nonce), $keypair); |
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\Sodium\memzero($keypair); |
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\Sodium\memzero($box); |
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\Sodium\memzero($nonce); |
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if(empty($data)){ |
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throw new CryptoException('decryption failed'); // @codeCoverageIgnore |
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} |
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return $data; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function createSecretBox(string $data, string $nonce, string $key):string{ |
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$box = \Sodium\crypto_secretbox($data, $nonce, $key); |
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\Sodium\memzero($data); |
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\Sodium\memzero($nonce); |
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\Sodium\memzero($key); |
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return $box; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function openSecretBox(string $box, string $nonce, string $key):string{ |
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$data = \Sodium\crypto_secretbox_open($box, $nonce, $key); |
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\Sodium\memzero($box); |
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\Sodium\memzero($nonce); |
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\Sodium\memzero($key); |
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return $data; |
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} |
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} |
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codemasher /
php-threema
