88 lines
2.7 KiB
PHP
88 lines
2.7 KiB
PHP
<?php
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/**
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* JSON Web Token implementation, based on this spec:
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* http://tools.ietf.org/html/draft-ietf-oauth-json-web-token-06
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*
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* PHP version 5
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*
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* @category Authentication
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* @package Authentication_JWT
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* @author Neuman Vong <neuman@twilio.com>
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* @author Anant Narayanan <anant@php.net>
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* @license http://opensource.org/licenses/BSD-3-Clause 3-clause BSD
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* @link https://github.com/firebase/php-jwt
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*/
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class custom_encryption
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{
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// Store cipher method
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static private $ciphering = "AES-256-CBC";
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static private $key = "Awuc64pVpcB9xf";
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public static function encode($str)
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{
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$string_to_encrypt = $str;
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// $string_to_encrypt = 'CJf1ac5a9c47284292d42eadc8f30b75df/20201015';
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// echo "Original String: " . $string_to_encrypt . "\n";
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// Use OpenSSl encryption method
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$iv_length = openssl_cipher_iv_length(SELF::$ciphering);
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$options = 0;
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// echo '$iv_length-'.$iv_length;
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// Use random_bytes() function which gives
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// randomly 16 digit values
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// $encryption_iv = random_bytes($iv_length);
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$encryption_iv = openssl_random_pseudo_bytes($iv_length);
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// echo '$encryption_iv-'.$encryption_iv;
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// Alternatively, we can use any 16 digit
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// characters or numeric for iv
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$encryption_key = openssl_digest(SELF::$key, 'MD5', TRUE);
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// echo '$encryption_key='.$encryption_key;
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// Encryption of string process starts
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$encryption = openssl_encrypt($string_to_encrypt, SELF::$ciphering,
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$encryption_key, $options, $encryption_iv);
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// Display the encrypted string
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// echo "Encrypted String: " . $encryption . "\n";
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return base64_encode($encryption.'.'.base64_encode($encryption_iv));
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// return base64_encode(openssl_encrypt($data, $this->method, $this->key, 0, $iv) . $this->separator . base64_encode($iv));
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}
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public static function decode($str)
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{
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//echo 'Received-'.base64_decode($str);
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$received_data = explode('.',base64_decode($str));
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$str = $received_data[0];
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// Use OpenSSl encryption method
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$iv_length = openssl_cipher_iv_length(SELF::$ciphering);
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$options = 0;
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// echo '$iv_length-'.$iv_length;
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// Decryption of string process starts
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// Used random_bytes() which gives randomly
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// 16 digit values
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// $decryption_iv = random_bytes($iv_length);
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$decryption_iv = base64_decode($received_data[1]);
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// echo '$decryption_iv-'.$decryption_iv;
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// Store the decryption key
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$decryption_key = openssl_digest(SELF::$key, 'MD5', TRUE);
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// echo '$encryption_key='.$decryption_key;
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// Descrypt the string
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$decryption = openssl_decrypt ($str, SELF::$ciphering,
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$decryption_key, $options, ($decryption_iv));
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// Display the decrypted string
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// echo "Decrypted String: " . $decryption;
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return $decryption;
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}
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}
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