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cmxflash
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Joined: 11 Dec 2004
Posts: 872
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 Posted: Fri Aug 25, 2006 10:57 pm Post subject: Encryption in PHP without extensions |
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I was pretty bored in school today, so I decided to write two functions in PHP which can be used to both encrypt and decrypt text using MD5. The encryption is pretty fast and takes a lot of space. The decryption is pretty slow, though very secure.
I do not recommend you to use it with big files or big text documents. I use it in my stand-alone PHP-applications when I need to connect to my server from an unsecure connection and transfer some data.
Feel free to use it however you want.
| Code: | <?php
set_time_limit(600);
error_reporting(0);
function encrypt($__content, $__key) {
$__content = chunk_split(base64_encode($__content), 1, ",");
$__content = explode(",", $__content);
foreach($__content as $void => $__row) {
$__cache_content = $__cache_content.md5($__row.rand(1, 5).$__key).",";
}
return $__cache_content;
}
function decrypt($__content, $__key) {
$__content = explode(",", $__content);
$__possible_chars = "1234567890=QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm";
$__possible_chars = explode(",", chunk_split($__possible_chars, 1, ","));
foreach($__content as $void => $__row) {
foreach ($__possible_chars as $void2 => $__row_char) {
for($i=1;$i!=6;$i++) {
if (md5($__row_char.$i.$__key) == $__row) {
$__cache_res = $__cache_res.$__row_char;
}
}
}
}
return base64_decode($__cache_res);
}
?> |
| Quote: |
key = 1337
853731acff43bd85becfb2ccdfc6278f,c122dbfd2520745f54d7fa94525dfbb7,3901a63387b7e000b0e9fb98ad1c0463,3b2439cfd534f0a6931f0e9bad6eb427,bc6e1826a881c674f2400c75e79bdfbb |
Last edited by cmxflash on Mon Aug 28, 2006 10:48 pm; edited 2 times in total |
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Tom Chapman
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Joined: 09 Jul 2005
Posts: 933
Location: Australia
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| Posted: Sat Aug 26, 2006 1:57 pm Post subject: |
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| Soooo how do I use it? :P |
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cmxflash
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Joined: 11 Dec 2004
Posts: 872
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| Posted: Sat Aug 26, 2006 2:00 pm Post subject: |
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| MrWiseOne wrote: | | Soooo how do I use it? :P |
To encrypt:
| Code: | <?php
include("encryption.php"); //Or whatever you pasted the code into
echo encrypt("some data to encrypt", "the secret key"); //Will generate one shitloada text
?> |
To decrypt:
| Code: | <?php
include("encryption.php"); //Or whatever you pasted the code into
echo decrypt("The encrypted text here", "the secret key");
?> |
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Tom Chapman
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Joined: 09 Jul 2005
Posts: 933
Location: Australia
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| Posted: Sat Aug 26, 2006 2:03 pm Post subject: |
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| Awesome work CMX. :) |
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Mikor
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Joined: 21 Aug 2006
Posts: 144
Location: Hull, England
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| Posted: Sat Aug 26, 2006 2:08 pm Post subject: |
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Sooo... the decrypt function is basicly a brute-force attempt at guessing the original data?
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cmxflash
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Joined: 11 Dec 2004
Posts: 872
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| Posted: Sat Aug 26, 2006 2:27 pm Post subject: |
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| Mikor wrote: | | Sooo... the decrypt function is basicly a brute-force attempt at guessing the original data? |
Well, MD5 is a one-way hash encryption. If you suggest another way of recovering the data, feel free to post it here.
Last edited by cmxflash on Mon Aug 28, 2006 10:46 pm; edited 1 time in total |
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Tom Chapman
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Posts: 933
Location: Australia
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| Posted: Sat Aug 26, 2006 2:31 pm Post subject: |
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| Now why didn't I ask that! |
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Mikor
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Joined: 21 Aug 2006
Posts: 144
Location: Hull, England
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| Posted: Sat Aug 26, 2006 3:19 pm Post subject: |
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| cmxflash wrote: | | Mikor wrote: | | Sooo... the decrypt function is basicly a brute-force attempt at guessing the original data? |
Well, MD5 is a one-way hash encryption. If you suggest another way of revovering the data, feel free to post it here. |
Why not use another method of data encryption?
ie: multiple base64_encode's or something.
I'm making an encrypt/decrypt function now, it lets the owner of the script customize the encryption by editing an array which contains the order for running functions
ie: the array could be ('rot13','salt','base64','rot13')
Its pretty good, for example, if you input the string "test" with the encryption ('base64','rot13','salt','salt2','reverse','rot13','base64'), it will output: cDgxNDFyc25uczk2NTE5NW40N28ycTQyNW8wbm8zbzluNG9xMTg5NzAwMDExMTEwMTExMDEwMDExMTAxMT09QWR6VkdkMDAwMTExMTAxMTEwMTAwMTExMDExcHIwNXAzcjg3bjZxcnM1NjhybzBuOHIwcHE1NjE4OTc=
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Tom Chapman
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Joined: 09 Jul 2005
Posts: 933
Location: Australia
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| Posted: Sat Aug 26, 2006 3:56 pm Post subject: |
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Dumb-Ass-Tom-Time! lol
So are you saying that your script will encrypt a string into all those? |
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Mikor
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Joined: 21 Aug 2006
Posts: 144
Location: Hull, England
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| Posted: Sat Aug 26, 2006 4:19 pm Post subject: |
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No, it loops through that array,
eg:
if its ('reverse','base64','rot13')
it will reverse the string, base64_encode it, and then str_rot13 it.
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