new

Either generates a DH instance from scratch or by reading already existing DH parameters from string. Note that when reading a DH instance from data that was encoded from a DH instance by using #to_pem or #to_der the result will not contain a public/private key pair yet. This needs to be generated using #generate_key! first.

Parameters

• size is an integer representing the desired key size. Keys smaller than 1024 bits should be considered insecure.

• generator is a small number > 1, typically 2 or 5.

• string contains the DER or PEM encoded key.

Examples

DH.new # -> dh
DH.new(1024) # -> dh
DH.new(1024, 5) # -> dh
#Reading DH parameters
dh = DH.new(File.read('parameters.pem')) # -> dh, but no public/private key yet
dh.generate_key! # -> dh with public and private key