[PHP-DB] mcrypt problems

[Vania Smrkovski]

Hello,
    I am getting some odd errors trying to get an encrypt/decrypt process to
work. Looking at the manual examples and some other literature, I have tried
the two approaches listed below.  For each, I get a sometimes-works,
sometimes fails result.  The manual entry has a string of user notes with
problem like mine, but I still have problems.

Here's the relevant PHPInfo stuff:

-->
PHP Version 4.1.2
      Configure Command  './configure' '--with-mysql'
'--with-apache=../apache_1.3.23' '--enable-track-vars' '--with-xml'
'--enable-memory-limit=yes' '--enable-bcmath' '--with-gd=../gd-2.0.1'
'--enable-gd-native-tt' '--enable-gd-imgstrttf' '--with-gdbm=/usr/include'
'--enable-calendar' '--with-png-dir=/usr/lib' '--with-zlib-dir=/usr/include'
'--with-freetype-dir=/usr/local/include/freetype2'
'--with-jpeg-dir=/usr/local/lib' '--with-mcrypt' '--enable-trans-sid'
'--with-sablot=/usr/local/lib' '--with-imap' '--enable-xslt'
'--with-xslt-sablot' '--enable-sablot-errors-descriptive'


      Server API Apache


mcrypt
      mcrypt support enabled
      version 2.4.x
      Supported ciphers twofish rijndael-128 rijndael-192 rijndael-256
saferplus rc2 xtea serpent safer-sk64 safer-sk128 cast-256 loki97 gost
threeway cast-128 des tripledes enigma arcfour panama wake
      Supported modes ofb cfb nofb cbc ecb stream

--]


The first attempt used the following code:

-->
<?php
    $key = "this is a secret key";
    $input = "Let us meet at 9 o'clock at the secret place.";

    $td = mcrypt_module_open ('tripledes', '', 'ecb', '');
    $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td), MCRYPT_RAND);
    mcrypt_generic_init ($td, $key, $iv);
    $encrypted_data = mcrypt_generic ($td, $input);
    $decrypted_data = mdecrypt_generic ($td, $encrypted_data);
    mcrypt_generic_end ($td);

  echo "key:
$key<br>input:$input<br>encrypted:$encrypted_data<br>decrypted:$decrypted_da
ta";
?>
--]

This resulted, at first, in "key: this is a secret key
input:Let us meet at 9 o'clock at the secret place.
encrypted:\ºþê™Ï’áž(v¹FýaõFËU³æç SäÇÚÖzßù5Qì<±_™-:Í
decrypted:Let us meet at 9 o'clock at the secret place."

BUT after I refreshed/reloaded a couple of times, I got this: "Warning:
mcrypt_generic_init: Memory allocation error in
/home/pndrdrm001/www/administrator/crypt.php on line 64

Warning: 1 is not a valid MCrypt resource in
/home/pndrdrm001/www/administrator/crypt.php on line 65

Warning: 1 is not a valid MCrypt resource in
/home/pndrdrm001/www/administrator/crypt.php on line 66

Warning: 1 is not a valid MCrypt resource in
/home/pndrdrm001/www/administrator/crypt.php on line 67
key: this is a secret key
input:Let us meet at 9 o'clock at the secret place.
encrypted:
decrypted: "

There were no changes to the code.


The second try used the following:

In file 1, the functions:
-->
<?php

 function my_encrypt($sString)
 {
  GLOBAL $sCryptoKey;

  $iIV = mcrypt_create_iv (mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,
MCRYPT_MODE_ECB), MCRYPT_RAND);

  $sEncrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $sCryptoKey, $sString,
MCRYPT_MODE_ECB, $iIV);

  return($sEncrypted);
 } // End function my_encrypt

 function my_decrypt($sString)
 {
  GLOBAL $sCryptoKey;

  $iIV = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,
MCRYPT_MODE_ECB), MCRYPT_RAND);

  $sDecrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $sCryptoKey, $sString,
MCRYPT_MODE_ECB, $iIV);

  return(trim($sDecrypted));

 } // End function my_decrypt
?>
--]
and in file 2, the main page:
-->
<?php
  include "cryption.php";
  $sCryptoKey = "key";
  $input = "test";
  $encrypted = my_encrypt($input);
  $decrypted = my_decrypt($encrypted);

  echo "key:
$sCryptoKey<br>input:$input<br>encrypted:$encrypted<br>decrypted:$decrypted"
;


?>
--]

This resulted in "key: key
input:test
encrypted: &foUÝø§ª~RM¡°Kz à¼O¼¿rw”x@nÉ
decrypted:test " the first time, but then I got "Fatal error: generic_init
failed in /home/pndrdrm001/www/administrator/cryption.php on line 9" on the
second refresh.


Is there a missing call to free resources, or something?  What can be done?

Thanks!
_________________________
Vania Smrkovski
Internet/Interactivity Consultant
[EMAIL PROTECTED]
http://pandorasdream.com/
http://webdesign.pandorasdream.com/
http://community.pandorasdream.com