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|
# frozen_string_literal: true
#--
# Ruby/OpenSSL Project
# Copyright (C) 2017 Ruby/OpenSSL Project Authors
#++
require_relative 'marshal'
module OpenSSL::PKey
class DH
include OpenSSL::Marshal
# :call-seq:
# dh.compute_key(pub_bn) -> string
#
# Returns a String containing a shared secret computed from the other
# party's public value.
#
# This method is provided for backwards compatibility, and calls #derive
# internally.
#
# === Parameters
# * _pub_bn_ is a OpenSSL::BN, *not* the DH instance returned by
# DH#public_key as that contains the DH parameters only.
def compute_key(pub_bn)
peer = dup
peer.set_key(pub_bn, nil)
derive(peer)
end
# :call-seq:
# dh.generate_key! -> self
#
# Generates a private and public key unless a private key already exists.
# If this DH instance was generated from public \DH parameters (e.g. by
# encoding the result of DH#public_key), then this method needs to be
# called first in order to generate the per-session keys before performing
# the actual key exchange.
#
# See also OpenSSL::PKey.generate_key.
#
# Example:
# dh = OpenSSL::PKey::DH.new(2048)
# public_key = dh.public_key #contains no private/public key yet
# public_key.generate_key!
# puts public_key.private? # => true
def generate_key!
unless priv_key
tmp = OpenSSL::PKey.generate_key(self)
set_key(tmp.pub_key, tmp.priv_key)
end
self
end
class << self
# :call-seq:
# DH.generate(size, generator = 2) -> dh
#
# Creates a new DH instance from scratch by generating random parameters
# and a key pair.
#
# See also OpenSSL::PKey.generate_parameters and
# OpenSSL::PKey.generate_key.
#
# +size+::
# The desired key size in bits.
# +generator+::
# The generator.
def generate(size, generator = 2, &blk)
dhparams = OpenSSL::PKey.generate_parameters("DH", {
"dh_paramgen_prime_len" => size,
"dh_paramgen_generator" => generator,
}, &blk)
OpenSSL::PKey.generate_key(dhparams)
end
# Handle DH.new(size, generator) form here; new(str) and new() forms
# are handled by #initialize
def new(*args, &blk) # :nodoc:
if args[0].is_a?(Integer)
generate(*args, &blk)
else
super
end
end
end
end
class DSA
include OpenSSL::Marshal
class << self
# :call-seq:
# DSA.generate(size) -> dsa
#
# Creates a new DSA instance by generating a private/public key pair
# from scratch.
#
# See also OpenSSL::PKey.generate_parameters and
# OpenSSL::PKey.generate_key.
#
# +size+::
# The desired key size in bits.
def generate(size, &blk)
dsaparams = OpenSSL::PKey.generate_parameters("DSA", {
"dsa_paramgen_bits" => size,
}, &blk)
OpenSSL::PKey.generate_key(dsaparams)
end
# Handle DSA.new(size) form here; new(str) and new() forms
# are handled by #initialize
def new(*args, &blk) # :nodoc:
if args[0].is_a?(Integer)
generate(*args, &blk)
else
super
end
end
end
end
if defined?(EC)
class EC
include OpenSSL::Marshal
# :call-seq:
# ec.dh_compute_key(pubkey) -> string
#
# Derives a shared secret by ECDH. _pubkey_ must be an instance of
# OpenSSL::PKey::EC::Point and must belong to the same group.
#
# This method is provided for backwards compatibility, and calls #derive
# internally.
def dh_compute_key(pubkey)
peer = OpenSSL::PKey::EC.new(group)
peer.public_key = pubkey
derive(peer)
end
end
class EC::Point
# :call-seq:
# point.to_bn([conversion_form]) -> OpenSSL::BN
#
# Returns the octet string representation of the EC point as an instance of
# OpenSSL::BN.
#
# If _conversion_form_ is not given, the _point_conversion_form_ attribute
# set to the group is used.
#
# See #to_octet_string for more information.
def to_bn(conversion_form = group.point_conversion_form)
OpenSSL::BN.new(to_octet_string(conversion_form), 2)
end
end
end
class RSA
include OpenSSL::Marshal
class << self
# :call-seq:
# RSA.generate(size, exponent = 65537) -> RSA
#
# Generates an \RSA keypair.
#
# See also OpenSSL::PKey.generate_key.
#
# +size+::
# The desired key size in bits.
# +exponent+::
# An odd Integer, normally 3, 17, or 65537.
def generate(size, exp = 0x10001, &blk)
OpenSSL::PKey.generate_key("RSA", {
"rsa_keygen_bits" => size,
"rsa_keygen_pubexp" => exp,
}, &blk)
end
# Handle RSA.new(size, exponent) form here; new(str) and new() forms
# are handled by #initialize
def new(*args, &blk) # :nodoc:
if args[0].is_a?(Integer)
generate(*args, &blk)
else
super
end
end
end
end
end
|
