How to use Key_RSA

I have the original Netduino Plus version 1. I am running the stock 4.1 NETMF on it.

 

I am doing a web server app that I need some security on. I know SSL is not available, so I was thinking I could just use the built in Key_RSA class that comes in 4.1.

 

The problem is I don't know enough about RSA to get from point A to point B in using it. When I do this:

Key_RSA crypto = new Key_RSA(..., ...);

The ... and ... are byte[] values. The first is called Modulus and the second is called Exponent.

 

What are those and where do I find them? I read several web pages about RSA encryption and I understand I need a public / private key pair. I did find a web site that talked about the modulus and exponent, but not how you get them.

 

I found a site that will generate an RSA 1024 bit public / private key pair. They are base 64 strings, but don't say anything about the modulus and exponent parts.

 

So the question I have is where do I get those values to put into the constructor?

 

I guess while I am at it I should also make sure that the Key_RSA stuff is actually implemented on the Netduino Plus 1. is it?

Hi tpitman,

The old crypto libraries aren't incorporated into the firmware for Netduino.

We did build a managed code AES implementation, if you're interested in playing with that.

Welcome to the Netduino community,

Chris

Thank you for the welcome. I look forward to doing more with Netduino.

 

Are you saying that even in 4.1 the RSA stuff is not there?

 

If that is the case, then yes, I would like to use whatever library you have available as long as it will work in the Netduino Plus 1. I don't have the 2.

 

Also, what firmware version do I need?

bump

Hi

 

Have a look at this post

 

http://forums.netdui...ryption-library

 

https://www.bouncycastle.org/

 

I have used the XTEA implementation on a Netduino, Fez Spider and Windows Azure projects

 

Bryn

Very nice. Thank you!