Re: [Mldonkey-users] ed2k hash question

[Lionel Bouton]

John Blitch wrote the following on 12/12/04 11:01 :

> Hello!
>
> I've been searching the internet, trying to find out why "openssl dgst
> -md4" doesn't give a hash that matches that of a file's ed2k URL. My
> only lead is from this mailing list:
>
> http://lists.gnu.org/archive/html/mldonkey-users/2002-12/msg00222.html
>
> But I can't find the referenced message in the archives. My output
> from "openssl dgst -md4" has never matched that of "ed2k_hash", and I
> can't figure out why. It's probably something obvious, but any help
> would be greatly appreciated.
>
>  

IIRC the hash is actually the MD4 hash of the MD4 hashes of each segment 
of the file. The file is splitted into segments of a fixed size, the MD4 
has is computed for each one, the resulting hashes are put in a single 
string in the order corresponding to the segments' order in the file and 
the string md4 hash is the ed2k hash.

Don't remember the exact segment size, should be around 7 or 9 MB.