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<?php |
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namespace App\Tools; |
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use App\Config; |
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/** |
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* Lib_Auth_Crypt |
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* |
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* @author Pierre Fromager <pf@pier_infor.fr> |
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* @version 1.0 |
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* |
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* This is a static lib to encrypt/decrypt string from a given crypto algorithm. |
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* Using openssl we check if the chosen algo is available. |
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* We do not use mcrypt because deprecated and unsecure. |
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*/ |
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class Crypt |
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{ |
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const BIT_8 = '8bit'; |
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const ERR_MSG_UNSUPPORTED_METHOD = 'Unsupported openssl method '; |
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const ERR_MSG_ENCRYPTION_FAIL = 'Encryption failure'; |
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const DEFAULT_ALGO = 'aes-256-ctr'; |
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/** |
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* method is crypt algo |
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* |
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* @var String |
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*/ |
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private $method = self::DEFAULT_ALGO; |
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/** |
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* crypt key |
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* |
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* @var String |
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*/ |
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private $key = ''; |
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/** |
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* instanciate |
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* |
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* @param Config $config |
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*/ |
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public function __construct(Config $config) |
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{ |
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$configJwt = $config->getSettings('jwt'); |
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$this->key = $configJwt['secret']; |
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} |
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/** |
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* setAlgo |
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* |
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* @param string $algo |
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* @return Crypt |
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* @throws Exception |
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*/ |
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public function setAlgo(string $algo): Crypt |
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{ |
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if (!in_array($algo, openssl_get_cipher_methods())) { |
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throw new \Exception(self::ERR_MSG_UNSUPPORTED_METHOD . $algo); |
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} |
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$this->method = $algo; |
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return $this; |
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} |
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/** |
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* setB64Key |
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* |
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* @param string $key |
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* @return Crypt |
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* @throws Exception |
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*/ |
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public function setB64Key(string $key): Crypt |
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{ |
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$this->key = base64_decode($key); |
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return $this; |
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} |
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/** |
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* encrypt content |
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* |
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* @param mixed $content |
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* @param boolean $encode |
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* @return mixed |
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*/ |
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public function encrypt($content, bool $encode = true) |
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{ |
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$nonceSize = openssl_cipher_iv_length($this->method); |
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$nonce = openssl_random_pseudo_bytes($nonceSize); |
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$cryptedContent = openssl_encrypt( |
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$content, |
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$this->method, |
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$this->key, |
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OPENSSL_RAW_DATA, |
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$nonce |
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); |
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if ($encode) { |
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return base64_encode($nonce . $cryptedContent); |
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} |
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return $nonce . $cryptedContent; |
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} |
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/** |
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* decrypt content |
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* |
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* @param mixed $content |
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* @param boolean $encoded |
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* @return mixed |
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*/ |
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public function decrypt($content, bool $encoded = true) |
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{ |
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if ($encoded) { |
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$content = @base64_decode($content, true); |
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if ($content === false) { |
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throw new \Exception(self::ERR_MSG_ENCRYPTION_FAIL); |
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} |
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} |
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$nonceSize = openssl_cipher_iv_length($this->method); |
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$nonce = mb_substr($content, 0, $nonceSize, self::BIT_8); |
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$cryptedContent = mb_substr( |
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$content, |
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$nonceSize, |
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null, |
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self::BIT_8 |
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); |
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$decrypted = openssl_decrypt( |
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$cryptedContent, |
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$this->method, |
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$this->key, |
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OPENSSL_RAW_DATA, |
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$nonce |
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); |
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return $decrypted; |
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} |
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/** |
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* getVersionNumber |
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* |
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* @return int |
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*/ |
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public function getVersionNumber(): int |
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{ |
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return OPENSSL_VERSION_NUMBER; |
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} |
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/** |
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* getVersionText |
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* |
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* @return string |
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*/ |
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public function getVersionText(): string |
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{ |
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return OPENSSL_VERSION_TEXT; |
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} |
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} |
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pierre-fromager /
nymfonya
