Hello all.

I tried the openssl-users list but I think this may be a question for
the devel list:

I'm doing my "homework" about openssl, but *this question has nothing to
do with it*. It's just a doubt that arised while doing it.

There is one exercise with the following text:

--------
Con el comando “openssl enc” y la siguiente clave AES:
188458A6D15034DFE386F23B61D43774 se puede descifrar cierta información.
Podr*as decir cual?
--------
Using the command " openssl enc" and the following AES key:
188458A6D15034DFE386F23B61D43774 you can decode some information, could
you say what?

I started playing with "openssl enc" and I thought the only thing I
could "guess" was the salt (Surely I'm wrong).

So I ran the command with a random IV:
openssl enc -aes128 -K 188458A6D15034DFE386F23B61D43774 -iv 1 -P

I found that the salt varies as it should on two machines with 32 bit
CPU (not my main one):

Office's computer (openssl 0.9.8g-4ubuntu2):
salt=4075DFB76496F2B7
salt=4045D8B76466EBB7
salt=40C5DAB764E6EDB7
salt=4015DEB76436F1B7
salt=4025DFB76446F2B7

A server I have somewhere else (openssl 0.9.8c-4etch1):
salt=50D882BF0C000000
salt=B05DD9BF0C000000
salt=A0CCC7BF0C000000
salt=E0C88BBF0C000000
salt=204190BF0C000000

But when I run it on my main computer, it always outputs the same salt!
This machine is a 64bit CPU, running a 64bits linux distribution
(openssl 0.9.8g-4ubuntu2):

salt=0004000000000000
salt=0004000000000000
salt=0004000000000000
salt=0004000000000000

I've been searching through the openssl lists and found nothing about
this behavior.

What can be happening? Is it about the 64 bit version of openssl?

Thanks a lot for your attention.

Regards.


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