Edit the MD5 algorithm

Hi All,

I would like to edit the MD5 algorithm behavior
inside the OpenSSL source code.

Normal MD5:
-----------
#echo -n "hello" |openssl md5
5d41402abc4b2a76b9719d911017c592

#echo -n "XhelloY" |openssl md5
97074cd1b41b9b017e0326420b4ec1e5


Modified MD5:
------------
#echo -n "hello" |openssl md5
97074cd1b41b9b017e0326420b4ec1e5

I would like the algorithm add a "X" at the begining of the string and
add a "Y" at the end of the string then perform the MD5 algorithm.

Is it possible?

Thanks for any replies

Cyrus

cyrustam@gmail.com wrote:
> Hi All,
>
> I would like to edit the MD5 algorithm behavior
> inside the OpenSSL source code.
>
> Normal MD5:
> -----------
> #echo -n "hello" |openssl md5
> 5d41402abc4b2a76b9719d911017c592
>
> #echo -n "XhelloY" |openssl md5
> 97074cd1b41b9b017e0326420b4ec1e5
>
>
> Modified MD5:
> ------------
> #echo -n "hello" |openssl md5
> 97074cd1b41b9b017e0326420b4ec1e5
>
> I would like the algorithm add a "X" at the begining of the string and
> add a "Y" at the end of the string then perform the MD5 algorithm.
>
> Is it possible?
>
Yes. Probably at the penalty of an extra malloc/memcpy/free. But why in
Murphy's name would you want to break your system in such a way? Much
easier to just do

$ echo -n "hello" | sed 's/^/X/;s/$/Y/' | openssl md5
97074cd1b41b9b017e0326420b4ec1e5

J.