>> I have found some code and set up a test bed for it, but it fails to
> return
>> the same value after the 26th item. I was hoping someone could take a
>> look
>> and maybe tell me why? There is very little help out there for
>> encryption.
>> If you know of a working example/tutorial, can you please reply with a
> link?
>>
>> Many thanks,
>>
>> Darren
>>
>> <?
>> global $arrAlphaVals;
>> global $intTot;
'global' makes NO SENSE outside the context of a function body.
Get rid of these.
>> $intTot = 5000;
>> $arrAlphaVals = array();
>>
>> function init()
>> {
>> global $arrAlphaVals;
>> global $intTot;
>> for ($i=0;$i<$intTot;$i++)
>> {
>> $arrAlphaVals[$i] = sprintf("%016s",
>> strtoupper(dechex($i)));
>> }
>> return $arrAlphaVals;
>> }
>> function main()
>> {
>> global $arrAlphaVals;
>> global $intTot;
>> init();
>>
>> $arrError = array();
>> echo "Encryption test<br>\n";
>> for ($i=0;$i<$intTot;$i++)
>> {
>> if ($i%1000 == 0)
>> {
>> echo $i."<br>";
>> flush();
>> }
>> $strInit = $arrAlphaVals[$i];
>> $strEncVal = encryptIt($strInit);
>> $strOut = decryptIt($strEncVal);
>> //echo "In: ".$strInit.", Enc: ".$strEncVal.", Out: ".$strOut."<br>";
>> if ($strOut != $strInit)
>> {
>> $strError .= "Failed on: ".$i."<br>\n";
>> $arrError[$strInit] = $strOut;
>> }
>> }
>> if (sizeof($arrError) > 0)
>> {
>> // There were errors
>> foreach ($arrError as $strKey => $strVal)
>> {
>> echo "Input: '".$strKey."' failed with result
>> '".$strVal."'<br>\n";
>> }
>> echo "<hr>".$strError;
>> }
>> echo "<hr>Tested ".$i." cases. Done.<br>\n";
>> }
>> function encryptIt($strIn)
>> {
>> $key = "biteme";
>> $strRet = _mencrypt($strIn, $key);
>> return $strRet;
>> }
>> function decryptIt($strIn)
>> {
>> $key = "biteme";
>> $strRet = _mdecrypt($strIn, $key);
>> return $strRet;
>> }
>> function _mencrypt($input,$key)
>> {
>> $input = str_replace("\n","",$input);
>> $input = str_replace("\t","",$input);
>> $input = str_replace("\r","",$input);
>> $key = substr(md5($key),0,24);
>> $td = mcrypt_module_open ('tripledes', '', 'ecb', '');
>> $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td),
> MCRYPT_RAND);
Where did you call srand() as the manual says you should?
http://php.net/mcrypt_create_iv
>> mcrypt_generic_init ($td, $key, $iv);
Why are you not checking your error codes here?
This function alone has -3, -4, and "unknown" error codes you should be
checking.
*EVERY* function with a documented error code return mechanism needs you
to write code to *CHECK* that return code.
You'll find a *TON* of things out a lot faster if you write that extra few
lines of code for each function call.
>> $encrypted_data = mcrypt_generic ($td, $input);
>> mcrypt_generic_deinit ($td);
>> mcrypt_module_close ($td);
>> return trim(chop(base64_encode($encrypted_data)));
>> }
>>
>> //$input - stuff to decrypt
>> //$key - the secret key to use
>>
>> function _mdecrypt($input,$key)
>> {
>> $input = str_replace("\n","",$input);
>> $input = str_replace("\t","",$input);
>> $input = str_replace("\r","",$input);
>> $input = trim(chop(base64_decode($input)));
>> $td = mcrypt_module_open ('tripledes', '', 'ecb', '');
>> $key = substr(md5($key),0,24);
>> $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td),
> MCRYPT_RAND);
>> mcrypt_generic_init ($td, $key, $iv);
>> $decrypted_data = mdecrypt_generic ($td, $input);
>> mcrypt_generic_deinit ($td);
>> mcrypt_module_close ($td);
>> return trim(chop($decrypted_data));
>> }
>> main();
>> ?>
>>
>> The original encryption and decryption code came from Jeremy Stansfield
>> (http://www.weberdev.com/get_example-3752.html)
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