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<?php |
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declare(strict_types=1); |
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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/Operations |
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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\Operations; |
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use GanbaroDigital\MessagingPipeline\V1\Exceptions\CannotDecryptString; |
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use GanbaroDigital\MessagingPipeline\V1\Requirements\RequireValidEncryptionCipher; |
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use GanbaroDigital\MessagingPipeline\V1\Requirements\RequireValidEncryptionIV; |
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/** |
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* decrypt a previously encrypted string |
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*/ |
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class DecryptString |
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{ |
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/** |
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* decrypt a previously encrypted string |
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* |
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* @param string $item |
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* the string that you want to decrypt |
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* @param string $fieldOrVarName |
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* what do you call $item in your own code? |
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* @param string $encryptionType |
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* what kind of encryption cipher do you want to use? |
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* this must be supported by OpenSSL |
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* @param string $encryptionKey |
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* a password given to you by the person who encrypted the string |
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* @param string $iv |
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* the initialisation vector to used to decrypt the string |
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* @return string |
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* the decrypted copy of $item |
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*/ |
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public static function from(string $item, string $fieldOrVarName, string $encryptionType, string $encryptionKey, string $iv) |
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{ |
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// robustness! |
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RequireValidEncryptionCipher::apply()->to($encryptionType, '$encryptionType'); |
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RequireValidEncryptionIV::apply($encryptionType)->to($iv, '$iv'); |
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// deal with decryption problems |
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$errorMessage = null; |
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set_error_handler(function ($errno, $errstr) use (&$errorMessage) { |
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$errorMessage = $errstr; |
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}); |
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$retval = openssl_decrypt( |
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$item, |
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$encryptionType, |
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$encryptionKey, |
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OPENSSL_RAW_DATA, |
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$iv |
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); |
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restore_error_handler(); |
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// did we manage to decrypt it? |
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if ($errorMessage || !$retval) { |
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// something went wrong |
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throw CannotDecryptString::newFromInputParameter($item, $fieldOrVarName, ['PHP_error' => $errorMessage]); |
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} |
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// if we get here, then all is well |
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return $retval; |
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} |
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} |
ganbarodigital /
php-mv-messaging-pipeline
