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<?php |
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/** |
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* Copyright (c) 2017-present Ganbaro Digital Ltd |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* * Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* * Neither the names of the copyright holders nor the names of his |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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* @category Libraries |
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* @package MessagingPipeline/Checks |
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* @author Stuart Herbert <[email protected]> |
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* @copyright 2017-present Ganbaro Digital Ltd www.ganbarodigital.com |
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* @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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* @link http://ganbarodigital.github.io/php-mv-messaging-pipeline |
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*/ |
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namespace GanbaroDigital\MessagingPipeline\V1\Checks; |
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use GanbaroDigital\MissingBits\Checks\Check; |
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use GanbaroDigital\MissingBits\Checks\ListCheck; |
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use GanbaroDigital\MissingBits\Checks\ListCheckHelper; |
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/** |
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* do we have an encryption initialisation vector that we can use? |
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* |
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* the initialisation vector (IV for short) is often used in configs |
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* as a 'shared secret' |
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*/ |
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class IsValidEncryptionIV implements Check, ListCheck |
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{ |
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// saves us having to implement inspectList() ourselves |
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use ListCheckHelper; |
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/** |
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* what kind of encryption are we using? |
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* @var string |
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*/ |
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private $encryptionType; |
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/** |
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* constructor |
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* |
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* @param string $encryptionType |
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* the OpenSSL encryption cipher that we are using |
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*/ |
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public function __construct(string $encryptionType) |
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{ |
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$this->encryptionType = $encryptionType; |
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} |
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/** |
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* do we have an encryption initialisation vector that we can use? |
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* |
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* the initialisation vector (IV for short) is often used in configs |
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* as a 'shared secret' |
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* |
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* @param string $encryptionType |
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* what kind of encryption are we using? |
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* @param string $iv |
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* what initialisation vector are we checking? |
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* @return bool |
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* TRUE if $iv is a valid initialisation vector for the given |
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* $encryptionType |
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* FALSE otherwise |
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*/ |
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public static function check(string $encryptionType, string $iv) : bool |
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{ |
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// deal with a bad cipher |
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$errorMessage = null; |
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set_error_handler(function ($errno, $errstr) use (&$errorMessage) { |
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$errorMessage = $errstr; |
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}); |
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$requiredLen = openssl_cipher_iv_length($encryptionType); |
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restore_error_handler(); |
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// was there a problem? |
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if ($errorMessage || $requiredLen === false) { |
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return false; |
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} |
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// if we get here, then we can check that we have enough bytes |
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return (strlen($iv) === $requiredLen); |
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} |
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/** |
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* do we have an encryption type that we can use? |
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* |
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* @param string $iv |
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* what initialisation vector are we checking? |
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* @return bool |
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* TRUE if $iv is a valid initialisation vector for the given |
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* $encryptionType |
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* FALSE otherwise |
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*/ |
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public function inspect($iv) |
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{ |
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// we are just a wrapper around our stateless check |
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return static::check($this->encryptionType, $iv); |
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} |
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/** |
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* do we have an encryption type that we can use? |
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* |
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* @param string $encryptionType |
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* what kind of encryption are we using? |
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* @param array|Traversable $list |
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* the list of initialisation vectors to examine |
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* @return bool |
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* TRUE if all the items in $list are valid initialisation vectors |
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* for the given $encryptionType |
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* FALSE otherwise |
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*/ |
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public static function checkList(string $encryptionType, $list) : bool |
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{ |
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// we are just a wrapper around our OO list inspector |
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$inspector = new static($encryptionType); |
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return $inspector->inspectList($list); |
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} |
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} |
ganbarodigital /
php-mv-messaging-pipeline
