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PORandom results in custom encryption / decryption function
 

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  1. PORandom results in custom encryption / decryption function
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    <p>Im trying to encrypt data through a custom function i created... (based on base64) The code works but to a degree... it gives random results (sometimes work and sometimes doesn't).</p> <pre><code>&lt;?php set_time_limit(0); class encryptor{ function encrypt($data){ $all = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!?@,.&amp;*()$; "; $chars = str_split($all, 1); // Split $all to array of single characters $text_chars = str_split($data, 1); // Split $data to array of single characters // Create array of unique results based on the characters from $all foreach($chars as $char){ $array[$char] = md5(uniqid(rand(), true)); } // Replace the input text with the results from $array foreach($text_chars as $text_char){ $data = str_replace($text_char,$array[$text_char], $data); } // Encode and compress $array as $solution $solution = gzcompress(base64_encode(json_encode($array)),9); // Return the encoded solution + Breaker + encoded and compressed input text return $solution."BREAKHERE".gzcompress(base64_encode($data),9); } function decrypt($data){ // Break the encrypted code to two parts $exploded = explode('BREAKHERE', $data); // Decoding the contents $contents = base64_decode(gzuncompress($exploded[1])); // Decoding solution ($array) $solves = json_decode(base64_decode(gzuncompress($exploded[0])),true); $fliped = array_flip($solves); // Replace the encrypted data with the solution foreach($solves as $solve){ $contents = str_replace($solve,$fliped[$solve], $contents); } return($contents); // Return decoded data } } $text = "11 1"; $enc = new encryptor(); $encrypted = $enc-&gt;encrypt($text); $decrypted = $enc-&gt;decrypt($encrypted); echo $decrypted; ?&gt; </code></pre>
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    1. USDaniel Shlomo
    1. USDaniel Shlomo
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    1. COIf you don't comment your code nobody will be able to follow your train of thought and therefore nobody will be able to help you. Without knowing what it does I wonder what the `md5(uniqid(rand(), true))` is for. How do you want to turn something back when random data was used that you don't have access to anymore.
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      1. PORandom results in custom encryption / decryption function
      1. USclentfort
    2. COI added comments. and yes, the 'md5(uniqid(rand(), true))' is to get the data back!
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      1. PORandom results in custom encryption / decryption function
      1. USDaniel Shlomo
    3. COA cryptography teacher told us on day 1 in class, *never* create your own encryption function because they are flawed and will be broken. I'd recommend using [`mcrypt`](http://php.net/mcrypt) and avoid any problems. Besides, nothing in that function is actually doing any encryption and you store the "key" with the data so its only a short matter of time before someone figures out how this works.
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      1. USdrew010
 

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