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Editing: Cryptor.php
<?php /** * Simple example of using the openssl encrypt/decrypt functions that * are inadequately documented in the PHP manual. * * Available under the MIT License * * The MIT License (MIT) * Copyright (c) 2016 ionCube Ltd. * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or substantial portions of * the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO * THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ namespace ioncube\phpOpensslCryptor; class Cryptor { private $cipher_algo; private $hash_algo; private $iv_num_bytes; private $format; const FORMAT_RAW = 0; const FORMAT_B64 = 1; const FORMAT_HEX = 2; /** * Construct a Cryptor, using aes256 encryption, sha256 key hashing and base64 encoding. * @param string $cipher_algo The cipher algorithm. * @param string $hash_algo Key hashing algorithm. * @param [type] $fmt Format of the encrypted data. */ public function __construct( $cipher_algo = 'aes-256-ctr', $hash_algo = 'sha256', $fmt = Cryptor::FORMAT_B64 ) { $this->cipher_algo = $cipher_algo; $this->hash_algo = $hash_algo; $this->format = $fmt; if ( ! in_array( $cipher_algo, openssl_get_cipher_methods( true ) ) ) { throw new \Exception( "Cryptor:: - unknown cipher algo {$cipher_algo}" ); } if ( ! in_array( $hash_algo, openssl_get_md_methods( true ) ) ) { throw new \Exception( "Cryptor:: - unknown hash algo {$hash_algo}" ); } $this->iv_num_bytes = openssl_cipher_iv_length( $cipher_algo ); } /** * Encrypt a string. * @param string $in String to encrypt. * @param string $key Encryption key. * @param int $fmt Optional override for the output encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX. * @return string The encrypted string. */ public function encryptString( $in, $key, $fmt = null ) { if ( $fmt === null ) { $fmt = $this->format; } // Build an initialisation vector $iv = openssl_random_pseudo_bytes( $this->iv_num_bytes, $isStrongCrypto ); if ( ! $isStrongCrypto ) { throw new \Exception( "Cryptor::encryptString() - Not a strong key" ); } // Hash the key $keyhash = openssl_digest( $key, $this->hash_algo, true ); // and encrypt $opts = OPENSSL_RAW_DATA; $encrypted = openssl_encrypt( $in, $this->cipher_algo, $keyhash, $opts, $iv ); if ( $encrypted === false ) { throw new \Exception( 'Cryptor::encryptString() - Encryption failed: ' . openssl_error_string() ); } // The result comprises the IV and encrypted data $res = $iv . $encrypted; // and format the result if required. if ( $fmt == Cryptor::FORMAT_B64 ) { $res = base64_encode( $res ); } else if ( $fmt == Cryptor::FORMAT_HEX ) { $unp = unpack( 'H*', $res ); $res = $unp[ 1 ]; } return $res; } /** * Decrypt a string. * @param string $in String to decrypt. * @param string $key Decryption key. * @param int $fmt Optional override for the input encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX. * @return string The decrypted string. */ public function decryptString( $in, $key, $fmt = null ) { if ( $fmt === null ) { $fmt = $this->format; } $raw = $in; // Restore the encrypted data if encoded if ( $fmt == Cryptor::FORMAT_B64 ) { $raw = base64_decode( $in ); } else if ( $fmt == Cryptor::FORMAT_HEX ) { $raw = pack( 'H*', $in ); } // and do an integrity check on the size. if ( strlen( $raw ) < $this->iv_num_bytes ) { throw new \Exception( 'Cryptor::decryptString() - ' . 'data length ' . strlen( $raw ) . " is less than iv length {$this->iv_num_bytes}" ); } // Extract the initialisation vector and encrypted data $iv = substr( $raw, 0, $this->iv_num_bytes ); $raw = substr( $raw, $this->iv_num_bytes ); // Hash the key $keyhash = openssl_digest( $key, $this->hash_algo, true ); // and decrypt. $opts = OPENSSL_RAW_DATA; $res = openssl_decrypt( $raw, $this->cipher_algo, $keyhash, $opts, $iv ); if ( $res === false ) { throw new \Exception( 'Cryptor::decryptString - decryption failed: ' . openssl_error_string() ); } return $res; } /** * Static convenience method for encrypting. * @param string $in String to encrypt. * @param string $key Encryption key. * @param int $fmt Optional override for the output encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX. * @return string The encrypted string. */ public static function Encrypt( $in, $key, $fmt = null ) { $c = new Cryptor(); return $c->encryptString( $in, $key, $fmt ); } /** * Static convenience method for decrypting. * @param string $in String to decrypt. * @param string $key Decryption key. * @param int $fmt Optional override for the input encoding. One of FORMAT_RAW, FORMAT_B64 or FORMAT_HEX. * @return string The decrypted string. */ public static function Decrypt( $in, $key, $fmt = null ) { $c = new Cryptor(); return $c->decryptString( $in, $key, $fmt ); } }
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