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.
So, If anyone can give advice I’d appreciate it!
Also, A general question: how do I look up class definitions of
“standard” classes that are not documented in RDoc? Is there something
similar to a C header file? (sorry, I’m quite new to Ruby).
Many thanks for your help.
On Wed, Aug 08, 2007 at 07:05:22AM +0900, Starfry Starfry wrote:
key = RSA.new(1024)
not seem to work.
How about Base64 ecoding?
[key.public_key.n.to_s].pack(‘m’)
Aaron P. wrote:
On Wed, Aug 08, 2007 at 07:05:22AM +0900, Starfry Starfry wrote:
key = RSA.new(1024)
not seem to work.
How about Base64 ecoding?
[key.public_key.n.to_s].pack(‘m’)
I could not get pack to work as you described. My code is below. I have
taken a different tack, to get my Javaption side to work with the
modulus and exponent in decimal.
def generate_keys
unless session[:private_key]
k = RSA.new(128)
session[:private_key] = k.to_pem
session[:public_modulus] = k.public_key.n.to_s
session[:public_exponent] = k.public_key.e.to_s
end
@private_key = session[:private_key]
@public_modulus = session[:public_modulus]
@public_exponent = session[:public_exponent]
end
I’d still like to be able to get this out of Ruby in Hex
If only I could find out the available methods in the RSA class (as I
said before the RDoc does not include anything about this class).
Thanks!
John L. wrote:
def generate_keys
unless session[:private_key]
k = RSA.new(128)
session[:private_key] = k.to_pem
session[:public_modulus] = k.public_key.n.to_s
session[:public_exponent] = k.public_key.e.to_s
end
@private_key = session[:private_key]
@public_modulus = session[:public_modulus]
@public_exponent = session[:public_exponent]
end
I’d still like to be able to get this out of Ruby in Hex
If only I could find out the available methods in the RSA class (as I
said before the RDoc does not include anything about this class).
Thanks!
Did this ever get resolved? This is the exact problem that I am trying
to solve. Thanks,
-S
yermej wrote:
On Dec 13, 9:24 am, Shandy N. [email protected] wrote:
@public_modulus = session[:public_modulus]
Did this ever get resolved? This is the exact problem that I am trying
to solve. Thanks,
-S
Posted viahttp://www.ruby-forum.com/.
This seems to work if you want it as a hex string:
key = OpenSSL::PKey::RSA.new(1024)
private_key = key.to_pem
public_modulus = key.public_key.n.to_s(16)
public_exponent = key.public_key.e.to_s(16)
This does work thank you. Does anyone know how to get at all the parts
that make up a public key such as the inverse? Thanks
On Dec 13, 9:24 am, Shandy N. [email protected] wrote:
@public_modulus = session[:public_modulus]
Did this ever get resolved? This is the exact problem that I am trying
to solve. Thanks,
-S
Posted viahttp://www.ruby-forum.com/.
This seems to work if you want it as a hex string:
key = OpenSSL::PKey::RSA.new(1024)
private_key = key.to_pem
public_modulus = key.public_key.n.to_s(16)
public_exponent = key.public_key.e.to_s(16)
On 12/13/07, Shandy N. [email protected] wrote:
This seems to work if you want it as a hex string:
key = OpenSSL::PKey::RSA.new(1024)
private_key = key.to_pem
public_modulus = key.public_key.n.to_s(16)
public_exponent = key.public_key.e.to_s(16)
This does work thank you. Does anyone know how to get at all the parts
that make up a public key such as the inverse? Thanks
I’m pretty sure that you can’t extract the inverse from a public key.
The whole point of a public/private key pair is that it’s extremely
difficult to compute the private key from the public key.
–
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/