Diffie-Hellman Implementation-Help

  • Thread starter Thread starter Badri Mohan
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Badri Mohan

Hi guys,
Anyone tried to do a Diffie-Hellman encryption and decryption totally in c#.
Any ideas?

Right now i do it as a separate win32 dll
and use PInvoke from c#..

Anyone tried of doin that entirely in C#..

Any exchange of ideas is appreciated.
Thanks and waiting for replies.

Badri
 
Badri,
Somehow I think this is not the correct newsgroup, but while your here...
So you already have a dll, is it one you wrote, or one someone else
supplied? If you wrote it, then it should be a straight forward, although
possibly lengthy, task to re-write using C#. Especially since it was
probably written in C or C++ in the first place.
Regards
Dave
 
Badri,

It should be easy - from a mathematical point of view. Manipulating big
integers is probably the main problem.
I know two ways to solve it.
a. Use the BigInteger class from the Mono project
(http://www.go-mono.com) or it's ancestor at CodeProject;
b. Use the bigInteger class from Microsoft that is included in Visual J#
redist.

Good luck!
 
Badri Mohan said:
Anyone tried to do a Diffie-Hellman encryption and decryption totally in c#.
Any ideas?
Right now i do it as a separate win32 dll
and use PInvoke from c#..
Anyone tried of doin that entirely in C#..
Click to expand...

As Sébastien mentioned, you can use the Mono BigInteger class to implement
it. That's exactly what I've done, so if you're interested here's the code:
http://www.mentalis.org/downloads/DH.zip
It appears to work perfectly but I haven't tested whether it's compatible
with other Diffie Hellman implementations. I assume it is, but I'd like to
verify that before I officially publish the code. I would appreciate it if
you could verify this for me, since you already have a working DH
implementation. I tried to write a C# wrapper around the CryptoAPI to verify
my managed code, but I ran into some problems.

Regards,
Pieter Philippaerts
 
Pieter Philippaerts said:
It appears to work perfectly but I haven't tested whether it's compatible
with other Diffie Hellman implementations.
Click to expand...

I just tested against Cipher448's implementation, and everything worked
perfectly.

Regards,
Pieter Philippaerts
 
Hey thats a cool implementation..
One more Question ..
Will it run under Mono in Linux..???
Thanks and waiting for reply..
 
Thanks for the reply...David
Actually everthing works fine for me when there is a wrapper created but it
does not run under Mono in Linux..
It says thereis a Out of sync error..
Any guesses??
 
Badri Mohan said:
Hey thats a cool implementation..
One more Question ..
Will it run under Mono in Linux..???
Thanks and waiting for reply..
Click to expand...

Yes, it will -- in fact, I just emailed the code to Sébastien to include it
in the Mono runtime.
However there's a bug in the official BigInteger implementation
[http://bugzilla.ximian.com/show_bug.cgi?id=51229] that may cause the
Diffie-Hellman implementation to malfunction. The BigInteger class that I
used for the Diffie-Hellman implementation contains a work-around for this
bug.

Regards,
Pieter Philippaerts
 
can i know how this code runs??i am not able to execute it..can u help me please?
 
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