Class: IrcDH1080

Inherits:
Object
  • Object
show all
Defined in:
lib/ircdh1080.rb,
lib/ircdh1080/base64.rb,
lib/ircdh1080/version.rb

Defined Under Namespace

Modules: Base64

Constant Summary collapse

VERSION = 
"0.1.0"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ IrcDH1080

Note:

The public/private keys are randomly generated with each call of IrcDH1080.new and remains the same for the duration of the object

Initializes the DH1080 object



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# File 'lib/ircdh1080.rb', line 12

def initialize
  # p = 0xFBE1022E23D213E8ACFA9AE8B9DFADA3EA6B7AC7A7B7E95AB5EB2DF858921
  #       FEADE95E6AC7BE7DE6ADBAB8A783E7AF7A7FA6A2B7BEB1E72EAE2B72F9FA2
  #       BFB2A2EFBEFAC868BADB3E828FA8BADFADA3E4CC1BE7E8AFE85E9698A783E
  #       B68FA07A77AB6AD7BEB618ACF9CA2897EB28A6189EFA07AB99A8A7FA9AE29
  #       9EFA7BA66DEAFEFBEFBF0B7D8B
  # g = 2
  # 1080bit

  # The p and g used in the IRC DH1080 protocol stored in pem format to speed
  # up Diffie-Hellman initialization
  pem = "-----BEGIN DH PARAMETERS-----\n"                                    \
        "MIGOAoGIAPvhAi4j0hPorPqa6LnfraPqa3rHp7fpWrXrLfhYkh/q3pXmrHvn3mrb\n" \
        "q4p4Pnr3p/pqK3vrHnLq4rcvn6K/sqLvvvrIaLrbPoKPqLrfraPkzBvn6K/oXpaY\n" \
        "p4PraPoHp3q2rXvrYYrPnKKJfrKKYYnvoHq5mop/qa4pnvp7pm3q/vvvvwt9iwIB\n" \
        "Ag==\n"                                                             \
        "-----END DH PARAMETERS-----\n"

  @dh = OpenSSL::PKey::DH.new pem
  @dh.generate_key!

  # Store the public key pre-encoded. This is what we send to others.
  @pub_key = IrcDH1080::Base64.encode(@dh.pub_key.to_s(2))
end

Instance Attribute Details

#pub_key ⇒ String (readonly)

Returns Our public key pre-encoded for sending to others.

Returns:

  • (String) —

    Our public key pre-encoded for sending to others



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# File 'lib/ircdh1080.rb', line 8

def pub_key
  @pub_key
end

Instance Method Details

#compute_key(key) ⇒ String

Computes the shared secret key

Parameters:

  • key (String) —

    the base64 encoded key sent by the other user

Returns:

  • (String) —

    the shared secret key



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# File 'lib/ircdh1080.rb', line 40

def compute_key(key)
  peer_key = OpenSSL::BN.new(IrcDH1080::Base64.decode(key), 2)
  secret = @dh.compute_key(peer_key)
  IrcDH1080::Base64.encode(OpenSSL::Digest::SHA256.digest(secret))
end