MSDOS-Based Compilable Code for RSA / Other Public-Key Scheme - MS-DOS

Hello everyone,

I hope this is the right place for
this question; if not, please refer
me to the right one. Thanks.
----------------------------

I was wondering if anyone should have any
BP v7.0, BC++ v3.1, FPK v1.10 or DJGPP code
for RSA implementation (or some other
public-key scheme(s)) of either a unit
(or module) or even a small program?

My goal is to be able to write an
MSDOS-based utility that would offer
the following functions:

1.) Generate a large secret/public key pair;

2.) Encrypt / decrypt a file, using a secret/public key;

3.) Sign / verify a file, using a secret/public key.


Anything useful would be greatly appreciated,

Thanks in advance,

Luke

Crypto Loko wrote:
> Hello everyone,
>
> I hope this is the right place for
> this question; if not, please refer
> me to the right one. Thanks.
> ----------------------------
>
> I was wondering if anyone should have any
> BP v7.0, BC++ v3.1, FPK v1.10 or DJGPP code
> for RSA implementation (or some other
> public-key scheme(s)) of either a unit
> (or module) or even a small program?
>
> My goal is to be able to write an
> MSDOS-based utility that would offer
> the following functions:
>
> 1.) Generate a large secret/public key pair;
>
> 2.) Encrypt / decrypt a file, using a secret/public key;
>
> 3.) Sign / verify a file, using a secret/public key.
>
>
> Anything useful would be greatly appreciated,
>
> Thanks in advance,
>
> Luke
>
Any of the generic source code in c++ or c will work with msdos with
very little modification. Google is your friend.

for example:
http://www.laynetworks.com/rsa_c.txt
http://www.thefreecountry.com/source...cryption.shtml

There is lots of source code for the common algorithms.

The main things that will need to be considered when porting:
1. I/O - not much change if using the standard run-time library
2. DOS's 64Kb default segment size when handling arrays longer than 64Kb.

Alex Russell

"I was wondering if anyone should have any
BP v7.0, BC++ v3.1, FPK v1.10 or DJGPP code
for RSA implementation (or some other
public-key scheme(s)) of either a unit
(or module) or even a small program?"

16-bit: Problems with memory

32-bit: should work fine.
"caddit" ported GNU-PG to DOS
with DGJPP:

http://www.caddit.net/programming.php

Download is broken, I reported this fact
but no reaction up to now ... :-(

Hi!

It is a problem of the webspace. I also couldn't download anything from
the page. But a friend had no problem...

Bye, Flo


FreeDOSfan wrote:
> "I was wondering if anyone should have any
> BP v7.0, BC++ v3.1, FPK v1.10 or DJGPP code
> for RSA implementation (or some other
> public-key scheme(s)) of either a unit
> (or module) or even a small program?"
>
> 16-bit: Problems with memory
>
> 32-bit: should work fine.
> "caddit" ported GNU-PG to DOS
> with DGJPP:
>
> http://www.caddit.net/programming.php
>
> Download is broken, I reported this fact
> but no reaction up to now ... :-(
>

Mr. "caddit" is obvioulsy dead, so I uploaded
the source (I had downloaded it long time ago):

www.mysoftware.cjb.net

I had thought that I had the EXE also, but I can't
find it now, so no EXE available :-(

Hi FreeDOSfan,

Did you mean I sould download the
file via the link titled GnuPG 1.41 for DJGPP / DOS / Windows
about mid-page down, at http://www.caddit.net/programming.php ?

Because the link properties, while "pretending" to link to a ZIP file,
only pop out a dialog box asking to save a "download.php" file.

However, if you do a simple search on the net you might find
two interesting sites, which I'm sure you're familiar with:
1. www.gnupg.org
2. www.pgpi.org

Now, on the GnuPG site, specifically on a page detailing the
Supported Systems for this software (check it out at
(http://www.gnupg.org/(en)/download/s...d_systems.html),
I have NOT found a "DOS" keyword anywhere on that page.

On the other hand, the PGPi site claim that THEIR GnuPG version
is actually MSDOS-compatible (offered as GnuPG 1.2.2 source code)
but I haven't had the time to attempt compilation yet. Maybe you
already
know, whether this one (GnuPG 1.2.2) is compilable using DJGPP v2.03 ?

Wondering,
Crypto