Two way encryption in php

Question

I need to do a 2-way encryption in PHP. Basically what I want to do is convert a string(Marshall for example) to something weird(s2323sdavrt44 for example) and then convert that (s2323sdavrt44) back to clear text string(Marshall).

How can I achieve this? And no I'm not doing this for passwords or anything, for div id attribute, so later I can split it for SQL queries.

I.... didn't understand what's the point of it all. There might be a [better solution](http://meta.stackexchange.com/questions/66377/what-is-the-xy-problem) — Madara's Ghost, Feb 26 '12 at 08:53

score 4 · Answer 1 · edited Oct 01 '13 at 10:37

4

Try this:

$key = 'password to (en/de)crypt';
$string = 'string to be encrypted';

$encrypted = base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, md5($key), $string, MCRYPT_MODE_CBC, md5(md5($key))));
$decrypted = rtrim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, md5($key), base64_decode($encrypted), MCRYPT_MODE_CBC, md5(md5($key))), "\0");

var_dump($encrypted);
var_dump($decrypted);

edited Oct 01 '13 at 10:37

Patrick Kostjens

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answered Oct 01 '13 at 10:20

Neeloy

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For future reference: using mcrypt is a bad idea. It has security holes and unpatched bugs and is even deprecated in PHP 7. – PoeHaH Sep 14 '17 at 03:09

Bakudan · Answer 2 · 2012-04-14T14:33:11.957

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One way to do this is using XOR encryption ^wikipedia. In this case you will have to use a "key" to encode and decode the text.

There is an example ^php.net for php, look at the example#2

edited Apr 14 '12 at 14:33

answered Feb 26 '12 at 08:59

Bakudan

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score 0 · Answer 3 · edited May 23 '17 at 12:24

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It is not in the php core but you can take a look at

http://php.net/manual/en/function.mcrypt-decrypt.php and http://php.net/manual/en/function.mcrypt-encrypt.php where you can crypt and decrypt strings with a valid key.

There is a good post about it at Best way to use PHP to encrypt and decrypt passwords?

edited May 23 '17 at 12:24

Community

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answered Feb 26 '12 at 09:31

Mattias

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score -1 · Answer 4 · edited Apr 15 '12 at 12:45

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$string === str_rot13( str_rot13($string) );

edited Apr 15 '12 at 12:45

answered Feb 26 '12 at 08:54

miki

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unless you wanna use something like open ssl, which would be a total overkill here, nothing really is "encryption" – scibuff Feb 26 '12 at 09:00
though he indeed says encryption in the question, i believe str_rot13 qualifies for "something weird" – miki Feb 26 '12 at 09:02
True. For what OP seems to want rot13 would probably work, but it should be noted that it is not, in fact, encryption. – HellaMad Feb 26 '12 at 09:03
in fact, it is, it's just that the knowledge for decryption is readily available – miki Feb 26 '12 at 09:08

score -2 · Answer 5 · answered Feb 26 '12 at 09:02

If u want to use any encryption then u can use 'openssl' in which u can use any reverseble encryptiopn algorithm to encrypt and decrypt. I have used this in php and works just fine.

All details are on this page : http://php.net/manual/en/book.openssl.php

Two way encryption in php

5 Answers5