Encryption Library

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Code snippet shows the HesabeCrypt file in PHP.

{info} The snippets for Encryption and Decryption are placed separately.

<?php

namespace App\Libraries;

class HesabeCrypt {
    // AES Encryption Method Starts
    public static function encrypt($str, $key, $ivKey)
    {
        $str = self::pkcs5_pad($str);
        $encrypted = openssl_encrypt($str, 'AES-256-CBC', $key, OPENSSL_ZERO_PADDING, $ivKey);
        $encrypted = base64_decode($encrypted);
        $encrypted = unpack('C*', ($encrypted));
        $encrypted = self::byteArray2Hex($encrypted);
        $encrypted = urlencode($encrypted);
        return $encrypted;
    }

    private static function pkcs5_pad($text)
    {
        $blocksize = 32;
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text.str_repeat(chr($pad), $pad);
    }

    private static function byteArray2Hex($byteArray)
    {
        $chars = array_map("chr", $byteArray);
        $bin = join($chars);
        return bin2hex($bin);
    }

    // Decryption Method for AES Algorithm Starts

    public static function decrypt($code, $key, $ivKey)
    {
        if (!(ctype_xdigit($code) && strlen($code) % 2 == 0)) {
            return false;
        }
        $code = self::hex2ByteArray(trim($code));
        $code = self::byteArray2String($code);
        $iv = $key;
        $code = base64_encode($code);
        $decrypted = openssl_decrypt($code, 'AES-256-CBC', $key, OPENSSL_ZERO_PADDING, $ivKey);
        return self::pkcs5_unpad($decrypted);
    }

    private static function hex2ByteArray($hexString)
    {
        $string = hex2bin($hexString);
        return unpack('C*', $string);
    }

    private static function byteArray2String($byteArray)
    {
        $chars = array_map("chr", $byteArray);
        return join($chars);
    }

    private static function pkcs5_unpad($text)
    {
        $pad = ord($text{strlen($text) - 1});
        if ($pad > strlen($text)) {
            return false;
        }
        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {
            return false;
        }
        return substr($text, 0, -1 * $pad);
    }
}

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