Problem decrypting data stored in MySQL text field using mcrypt?
| From: | Murray @ PlanetThoughtful.org | Date: | Mon, 26 Jan 2004 18:24:50 +0000 |
| Subject: | Problem decrypting data stored in MySQL text field using mcrypt? | ||
| Groups: | php.general | ||
| Request: | Send a blank email to php-general+get-175795@lists.php.net to get a copy of this message | ||
Hi All,
I'm trying to implement encryption on certain data fields in my MySQL database and I'm
experiencing ongoing problems.
I seem to be able to encrypt the data without issues, but can't figure out how to decrypt the
data.
My field in my test table, in which I'm storing the encrypted data, is a TEXT type field.
The code I'm using, from the PHP help file, is:
[ begin code ]
$key = "mysecretkey";
$input = "This is some plain text.";
$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);
$insq = "INSERT into test (entry) VALUES ('$encrypted_data')";
mysql_query($insq);
mcrypt_generic_deinit ($td);
mcrypt_module_close ($td);
$query = "SELECT entry from test";
$res = mysql_query($query);
$row = mysql_fetch_array($res);
mysql_free_result($res);
$et = $row["entry"];
$td = mcrypt_module_open ('tripledes', '', 'ecb', '');
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size ($td), MCRYPT_RAND);
mcrypt_generic_init ($td, $key, $iv);
$plain = mdecrypt_generic ($td, $et);
mcrypt_generic_deinit ($td);
mcrypt_module_close ($td);
echo "$input<p>$et<p>$plain<p>";
[ end code ]
The output from the echo statement, which I was expecting to be <plaintext> <encrypted
text> <decrypted plaintext>, is:
[ begin echo output]
This is some plain text.
#faÖŸdšK𳵚"‡Á¸•Š‹ßÐt£
#faÖŸdšK𳵚"‡Á¸•Š‹ßÐt£
[ end echo output ]
I assume some of the characters won't display properly in this post, however I can verify that
the <encrypted text> (line 2) and <decrypted plaintext> (line 3) appear to be identical,
where I was expecting the <plaintext> (line 1) and <decrypted plaintext> (line 3) to be
identical.
Can anyone give me an insight into what I'm doing wrong?
I'm using PHP version 4.3.4 and Apache 1.3.28 on WindowsXP, if these are meaningful.
Any help will be immensely appreciated!
Much warmth,
Murray
http://www.planetthoughtful.org
Building a thoughtful planet,
One quirky comment at a time.