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<?php |
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declare(strict_types=1); |
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/** |
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* OpensslKey.php. |
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* |
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* PHP version 7 |
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* |
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* @category Dcrypt |
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* |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* |
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* @link https://github.com/mmeyer2k/dcrypt |
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*/ |
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namespace Dcrypt; |
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use Dcrypt\Exceptions\InvalidKeyException; |
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/** |
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* Provides key derivation functions. |
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* |
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* @category Dcrypt |
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* |
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* @author Michael Meyer (mmeyer2k) <[email protected]> |
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* @license http://opensource.org/licenses/MIT The MIT License (MIT) |
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* |
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* @link https://github.com/mmeyer2k/dcrypt |
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*/ |
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final class OpensslKey |
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{ |
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/** |
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* High entropy 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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* Algo string. |
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* |
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* @var string |
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*/ |
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private $_algo; |
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/** |
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* High entropy salt. |
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* |
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* @var string |
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*/ |
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private $_iv; |
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/** |
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* Name of cipher |
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* |
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* @var string |
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*/ |
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private $_cipher; |
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/** |
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* OpensslKey constructor. |
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* |
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* @param string $key Key to use for encryption |
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* @param string $algo Algo to use for HKDF |
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* @param string $cipher Name of cipher |
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* @param string $ivr Initialization vector |
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* |
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* @throws InvalidKeyException |
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*/ |
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public function __construct( |
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string $key, |
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string $algo, |
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string $cipher = '', |
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string $ivr = '' |
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) |
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{ |
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// Store the key as what was supplied |
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$this->_key = \base64_decode($key, true); |
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// If key was not proper base64, bail out |
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if ($this->_key === false) { |
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throw new InvalidKeyException(InvalidKeyException::BASE64ENC); |
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} |
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// If key was to short, bail out |
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if (Str::strlen($this->_key) < 32) { |
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throw new InvalidKeyException(InvalidKeyException::KEYLENGTH); |
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} |
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// Store algo in object |
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$this->_algo = $algo; |
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// Store init vector in object |
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$this->_iv = $ivr; |
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// Store the cipher name |
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$this->_cipher = $cipher; |
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} |
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/** |
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* Generate the authentication key. |
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* |
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* @return string |
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*/ |
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public function authenticationKey(): string |
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{ |
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return $this->deriveKey(__FUNCTION__ . '|' . $this->_cipher); |
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} |
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/** |
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* Generate the encryption key. |
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* |
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* @return string |
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*/ |
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public function encryptionKey(): string |
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{ |
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return $this->deriveKey(__FUNCTION__ . '|' . $this->_cipher); |
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} |
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/** |
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* Derive a key with differing info string parameters. |
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* |
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* @param string $info Info parameter to provide to hash_hkdf |
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* |
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* @return string |
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*/ |
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public function deriveKey(string $info): string |
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{ |
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return \hash_hkdf($this->_algo, $this->_key, 0, $info, $this->_iv); |
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} |
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/** |
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* Calculates a given message HMAC. |
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* |
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* @param string $message |
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* @return string |
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*/ |
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public function messageChecksum(string $message): string |
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{ |
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return \hash_hmac($this->_algo, $message, $this->authenticationKey(), true); |
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} |
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/** |
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* Magic method to allow read only access to private variables via whitelist |
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* |
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* @param string $name |
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* @return mixed |
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* @throws \Exception |
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*/ |
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public function __get(string $name) |
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{ |
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if (in_array($name, ['iv', 'algo', 'cipher'])) { |
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return $this->{"_{$name}"}; |
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} |
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throw new \Exception("Invalid property access attempt"); |
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} |
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/** |
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* Generate a new key that meets requirements for dcrypt. |
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* |
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* @param int $bytes Size of key in bytes |
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* |
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* @return string |
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* @throws InvalidKeyException |
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*/ |
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public static function create(int $bytes = 32): string |
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{ |
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if ($bytes < 32) { |
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throw new InvalidKeyException(InvalidKeyException::KEYLENGTH); |
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} |
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return \base64_encode(\random_bytes($bytes)); |
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} |
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} |
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mmeyer2k /
dcrypt
