From: Aaron Patterson <aaron@...>
Date: 2007-08-08T08:25:07+09:00
Subject: Re: Help with OpenSSL RSA

On Wed, Aug 08, 2007 at 07:05:22AM +0900, Starfry Starfry wrote:
> Hi,
> I'm writing a little code to do some RSA stuff and I need to extract the
> public exponent and modulus for passing to a browser that will use them
> in Javascript.
> 
> I've done considerable digging but have drawn a blank as I can't find
> any complete documentation of the full RSA class definition.
> 
> What I am trying right now is to do:
> 
> key = RSA.new(1024)
> private_key = key.to_pem
> public_modulus = key.public_key.n
> public_exponent = key.public_key.e
> 
> This generates a new key and assigns the private key to a variable. I'd
> like to get the public exponent and modulus returned as a hex encoded
> string, similar to the output of "openssl rsa -noout -modulus"
> 
> However, I can't find suitable documentation so I don't know what method
> (if any) I can use. I'd hoped for "key.public_key.n.to_h" but that does
> not seem to work.

How about Base64 ecoding?

  [key.public_key.n.to_s].pack('m')

-- 
Aaron Patterson
http://tenderlovemaking.com/