[SOLVED] Crazy Md5 Hashing...

[phpSensei]

I have seen many hashing in URL adresses like youtube, google, yahoo, and msn.com

 

I want to know several ways of doing this..

 

If someone can please show me an example of making your own hash, then I wound be happy.

[LiamProductions]

you can use the md5 function?

[phpSensei]

I want A shorter Type of Hashing...

[akitchin]

if you mean a reversible hash, you're wasting your time - anything that you can reverse, someone else is likely to be able to do as well.  hashes are often used by comparison, not by actually reversing the algorithm to obtain the input.

 

if you still want to, think of ANYTHING you want to perform to a string.  run a length count, do some math to it (that has unambiguous inverse functions), process back out into a random string, and cut it off / lengthen it to reach a set length.  just remember the operations and their order, and you should (theoretically - rounding could be a very big source of error in something like this) return to the original parameter.

 

perhaps you could be more specific about what you're trying to do.

[LiamProductions]

I don't know if something like this will work but always worth ago:

 

<?php

$hashthis = "jghie81fjme019";
echo shuffle('$hashthis');

?>

 

I don't even know if that even works. but worth a try. shuffle the random letters and numbers up some how i'd say.

[akitchin]

it won't work.  shuffle() expects an array, and if it DID take strings, it would be shuffling "$hashthis", not the value of $hashthis itself as you're using single quotes.

 

furthermore, this would be useless as a hashing method, as the algorithm is randomized - you could feed it two of the exact same array and get different output.  how would one compare the results with any degree of confidence that you're actually evaluating their equality?

[phpSensei]

What About This ....http://openflv.com/watch?v=NzE3MjQ4OA==&p=0

[LiamProductions]

I don't know if its possible but you could md5 the file name then get a script to take off like the first 10 chars. Then use the rest of the md5 hash to use as the url.

[phpSensei]

Md5 Is always Somethiing like c868d7wd8248ef78f But He Uses Something like N27aJ4xM, which is So Different...

 

How!

[akitchin]

usually it is a hash that they store in the database.  generally speaking, i doubt they use a chopped version of an MD5, as this could easily lead to collisions (unless one was to check the database first, to ensure that it's unique).  chances are it's just a random string they create for each file, without bothering with a hash.

 

EDIT:  it's only different in the number of characters that are rendered in the end.

[MadTechie]

Erm.. a 10 char code, simple base 62 calc

 

 

edit:

ie

0000000000

to

9999999999

+1

000000000a

 

you get the idea

 

62 being a-z + A-Z + 0-9

[phpSensei]

OHHHHH, and OHHHHHHH....

 

Lol, I got It working, Wow I feel like a Genius.

 

Thanks Guys, For all the Hard Effort and Weird Solutions.

[akitchin]

would you like to share your genius solution?

[phpSensei]

KK, I did this...

 

WAIT< Why Should I? Joking Lollerrr...

 

I just took the filename than put it in a variable....then..

 

.

<?php 


$filename1=$_FILE['name'];

$md5= md5($filename1);

$arr2 = str_split($md5, 6);

$new_file_name= $filename . "_" . $arr2;

INSERT INTO CRAP

?>

 

i dONT KNOW IF THAT MADE SENSE

 

 

[MadTechie]

ECHO akitchin;

 

i doubt they use a chopped version of an MD5, as this could easily lead to collisions

[phpSensei]

lol...

 

This forum can get so random.

 

Topic Solved.

[MadTechie]

if its "solved" then click solved  :-\