Re: Re: Encryption

Richard, Thanks for your help. The code (as I mentioned) was not mine. I did however find the example from the link you sent me to and followed that. It works quite well. Again, thanks for your time. Darren "Richard Lynch" <ceo@l-i-e.com> wrote in message news:1717.66.99.91.45.1103656210.squirrel@www.l-i-e.com... > >> 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) > > > -- > Like Music? > http://l-i-e.com/artists.htm