: "SSLeay + BER + DER + Diffie-Hellman algorithm"

Posted on 1998-08-11
Medium Priority
Last Modified: 2010-04-16
I have posted this question in the "Ask a C++ programming question" a few day ago,but for a second thought, this question is regarding about security, cryptography, diffie-hillman.  So I like to re-send it again in Java ,
Thank you so much for answering the two questions that I have posted a couple weeks ago.  Especially the asnwer from alexo. I am afraid that I have a more difficult question this time.  

A bit about SSleay program.

"SSLeay is a free implementation of Netscape's Secure Socket Layer - the software encryption protocol behind the Netscape Secure
Server and the Netscape Navigator Browser.

SSLeay is pronounced S-S-L-e-a-y (i.e. each letter is pronounced individually).

SSLeay implements both SSLv2 (version 2) and SSLv3 (version 3) as of the release of SSLeay-0.8.0.

This implementation was coded from scratch using only the publicly available documentation of the various protocols by Eric
Young eay@cryptsoft.com.

The initial prompting to tackle an SSL implementation, the alpha testing, SSL developer (i.e. Eric) hassling, Windows port and
documentation was done by Tim Hudson tjh@cryptsoft.com.

This implementation has been used by Tim Hudson tjh@cryptsoft.com to add SSL support to the following:

    telnet (server and client) [now called SSLtelnet]
    ftp (server and client) [now called SSLftp]
    NCSA Mosaic 2.5
    NCSA Mosaic 2.6b1
    NCSA Mosaic 2.6b2
    NCSA httpd 1.3

The following applications are also now available based on the earlier work with input from others:

    NCSA httpd 1.4.2

Support for the following are also available:

    CERN (or W3C) httpd

SSLeay implements the following encryption algorithms:


URL: http://ssleay.connectnet.com/ 

To download SSL
ftp://ftp.connectnet.com/pub/ssl - SSLeay source

To run the SSLeay program, there are two things need to be done.
1.  Install Microsoft Visual C++  
2.  Install Perl
For Windows NT/95 DLL's
1. perl Configure VC-WIN32
2. nmake -f ms\ntdll.mak

Go to directory c:\SSLeay-0.8.1b\out,double click on file ssleay.exe, a dos console window will display ?

Type dh ?

A list of option will shown you how to use the command line i.e:
 SSLeay > dh -inform ...DEC/BER/TXT.......  -outform ..DEC/BER/.TXT.

 As the way I understand it, the input file HAVE TO be in the DEC/BER formats.  I have tried to use text file, but it say bad input format.  I think, the main problem is how to generate the file in the format of BER or DER.  I don't think what contain inside the file is matter.  

Question:  How to generate a file with the extension BER. DER?
I am sorry that I have lost you somewhere above, but I am really appreciated if you could share some of your thoughts on the above matter.

Thank you  
Question by:ee9553

Accepted Solution

botafogo earned 30 total points
ID: 1232365
I'm not sure what you want to do.  If you want to generate the
Diffie-Hellman paramenters use the gendh comand.  
gendh -out dh.pem.  You can provide other parameters if you will.
Now to convert the dh file to the der format, use
dh -in dh.pem -out dh.der -inform pem -outform der.  Now you have
the dh in the der format.


Author Comment

ID: 1232366
Hello botafogo,

Thank you for sharing your thoughts.  I finally received something from the program which is the something right.

Thank you

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