Reverse code. Guid to String in PHP

Question

Possible Duplicate:
Reversing an MD5 Hash

I have a bit of code which I use to create a Guid from a String.

The code works fine but I now need to reverse the Guid it created and convert it back to the string.

Here is the code that I use to convert the String to Guid:

$s = strtoupper(md5($myString));
$guidText = 
substr($s,0,8) . '-' . 
substr($s,8,4) . '-' . 
substr($s,12,4). '-' . 
substr($s,16,4). '-' . 
substr($s,20); 

echo $guidText;

How can I reverse this code?

You cannot reverse a md5 hashed string. – Ozair Kafray Jun 09 '12 at 12:31 — Ozair Kafray, Jun 09 '12 at 12:31
http://www.golubev.com/hashgpu.htm – PeeHaa Jun 09 '12 at 14:45 — PeeHaa, Jun 09 '12 at 14:45

score 3 · Answer 1 · answered Jun 09 '12 at 12:31

3

You can only reverse it back to MD5 hash. You can't really reverse MD5 hash back to it's original string.

answered Jun 09 '12 at 12:31

Zbigniew

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score 2 · Answer 2 · answered Jun 09 '12 at 12:33

2

What you are looking for is encryption/decryption functions, not hash function(such as md5). Hash function are not reversable.

answered Jun 09 '12 at 12:33

Engineer

47,849
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score 1 · Accepted Answer · answered Jun 09 '12 at 12:31

1

md5() is a a hash function. Hash functions are not reversable

answered Jun 09 '12 at 12:31

klaustopher

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Reverse code. Guid to String in PHP

3 Answers3