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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.public_key -> dhnew
#
# Returns a new DH instance that carries just the \DH parameters.
#
# Contrary to the method name, the returned DH object contains only
# parameters and not the public key.
#
# This method is provided for backwards compatibility. In most cases, there
# is no need to call this method.
#
# For the purpose of re-generating the key pair while keeping the
# parameters, check OpenSSL::PKey.generate_key.
#
# Example:
# # OpenSSL::PKey::DH.generate by default generates a random key pair
# dh1 = OpenSSL::PKey::DH.generate(2048)
# p dh1.priv_key #=> #<OpenSSL::BN 1288347...>
# dhcopy = dh1.public_key
# p dhcopy.priv_key #=> nil
def public_key
DH.new(to_der)
end
# :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)
# FIXME: This is constructing an X.509 SubjectPublicKeyInfo and is very
# inefficient
obj = OpenSSL::ASN1.Sequence([
OpenSSL::ASN1.Sequence([
OpenSSL::ASN1.ObjectId("dhKeyAgreement"),
OpenSSL::ASN1.Sequence([
OpenSSL::ASN1.Integer(p),
OpenSSL::ASN1.Integer(g),
]),
]),
OpenSSL::ASN1.BitString(OpenSSL::ASN1.Integer(pub_bn).to_der),
])
derive(OpenSSL::PKey.read(obj.to_der))
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.
#
# <b>Deprecated in version 3.0</b>. This method is incompatible with
# OpenSSL 3.0.0 or later.
#
# See also OpenSSL::PKey.generate_key.
#
# Example:
# # DEPRECATED USAGE: This will not work on OpenSSL 3.0 or later
# dh0 = OpenSSL::PKey::DH.new(2048)
# dh = dh0.public_key # #public_key only copies the DH parameters (contrary to the name)
# dh.generate_key!
# puts dh.private? # => true
# puts dh0.pub_key == dh.pub_key #=> false
#
# # With OpenSSL::PKey.generate_key
# dh0 = OpenSSL::PKey::DH.new(2048)
# dh = OpenSSL::PKey.generate_key(dh0)
# puts dh0.pub_key == dh.pub_key #=> false
def generate_key!
if OpenSSL::OPENSSL_VERSION_NUMBER >= 0x30000000
raise DHError, "OpenSSL::PKey::DH is immutable on OpenSSL 3.0; " \
"use OpenSSL::PKey.generate_key instead"
end
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
# :call-seq:
# dsa.public_key -> dsanew
#
# Returns a new DSA instance that carries just the \DSA parameters and the
# public key.
#
# This method is provided for backwards compatibility. In most cases, there
# is no need to call this method.
#
# For the purpose of serializing the public key, to PEM or DER encoding of
# X.509 SubjectPublicKeyInfo format, check PKey#public_to_pem and
# PKey#public_to_der.
def public_key
OpenSSL::PKey.read(public_to_der)
end
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)
# FIPS 186-4 specifies four (L,N) pairs: (1024,160), (2048,224),
# (2048,256), and (3072,256).
#
# q size is derived here with compatibility with
# DSA_generator_parameters_ex() which previous versions of ruby/openssl
# used to call.
qsize = size >= 2048 ? 256 : 160
dsaparams = OpenSSL::PKey.generate_parameters("DSA", {
"dsa_paramgen_bits" => size,
"dsa_paramgen_q_bits" => qsize,
}, &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
# :call-seq:
# dsa.syssign(string) -> string
#
# Computes and returns the \DSA signature of +string+, where +string+ is
# expected to be an already-computed message digest of the original input
# data. The signature is issued using the private key of this DSA instance.
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw instead.
#
# +string+::
# A message digest of the original input data to be signed.
#
# Example:
# dsa = OpenSSL::PKey::DSA.new(2048)
# doc = "Sign me"
# digest = OpenSSL::Digest.digest('SHA1', doc)
#
# # With legacy #syssign and #sysverify:
# sig = dsa.syssign(digest)
# p dsa.sysverify(digest, sig) #=> true
#
# # With #sign_raw and #verify_raw:
# sig = dsa.sign_raw(nil, digest)
# p dsa.verify_raw(nil, sig, digest) #=> true
def syssign(string)
q or raise OpenSSL::PKey::DSAError, "incomplete DSA"
private? or raise OpenSSL::PKey::DSAError, "Private DSA key needed!"
begin
sign_raw(nil, string)
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::DSAError, $!.message
end
end
# :call-seq:
# dsa.sysverify(digest, sig) -> true | false
#
# Verifies whether the signature is valid given the message digest input.
# It does so by validating +sig+ using the public key of this DSA instance.
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw instead.
#
# +digest+::
# A message digest of the original input data to be signed.
# +sig+::
# A \DSA signature value.
def sysverify(digest, sig)
verify_raw(nil, sig, digest)
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::DSAError, $!.message
end
end
if defined?(EC)
class EC
include OpenSSL::Marshal
# :call-seq:
# key.dsa_sign_asn1(data) -> String
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw instead.
def dsa_sign_asn1(data)
sign_raw(nil, data)
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::ECError, $!.message
end
# :call-seq:
# key.dsa_verify_asn1(data, sig) -> true | false
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw instead.
def dsa_verify_asn1(data, sig)
verify_raw(nil, sig, data)
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::ECError, $!.message
end
# :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)
obj = OpenSSL::ASN1.Sequence([
OpenSSL::ASN1.Sequence([
OpenSSL::ASN1.ObjectId("id-ecPublicKey"),
group.to_der,
]),
OpenSSL::ASN1.BitString(pubkey.to_octet_string(:uncompressed)),
])
derive(OpenSSL::PKey.read(obj.to_der))
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
# :call-seq:
# rsa.public_key -> rsanew
#
# Returns a new RSA instance that carries just the public key components.
#
# This method is provided for backwards compatibility. In most cases, there
# is no need to call this method.
#
# For the purpose of serializing the public key, to PEM or DER encoding of
# X.509 SubjectPublicKeyInfo format, check PKey#public_to_pem and
# PKey#public_to_der.
def public_key
OpenSSL::PKey.read(public_to_der)
end
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
# :call-seq:
# rsa.private_encrypt(string) -> String
# rsa.private_encrypt(string, padding) -> String
#
# Encrypt +string+ with the private key. +padding+ defaults to
# PKCS1_PADDING, which is known to be insecure but is kept for backwards
# compatibility. The encrypted string output can be decrypted using
# #public_decrypt.
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw, and
# PKey::PKey#verify_recover instead.
def private_encrypt(string, padding = PKCS1_PADDING)
n or raise OpenSSL::PKey::RSAError, "incomplete RSA"
private? or raise OpenSSL::PKey::RSAError, "private key needed."
begin
sign_raw(nil, string, {
"rsa_padding_mode" => translate_padding_mode(padding),
})
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::RSAError, $!.message
end
end
# :call-seq:
# rsa.public_decrypt(string) -> String
# rsa.public_decrypt(string, padding) -> String
#
# Decrypt +string+, which has been encrypted with the private key, with the
# public key. +padding+ defaults to PKCS1_PADDING which is known to be
# insecure but is kept for backwards compatibility.
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#sign_raw and PKey::PKey#verify_raw, and
# PKey::PKey#verify_recover instead.
def public_decrypt(string, padding = PKCS1_PADDING)
n or raise OpenSSL::PKey::RSAError, "incomplete RSA"
begin
verify_recover(nil, string, {
"rsa_padding_mode" => translate_padding_mode(padding),
})
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::RSAError, $!.message
end
end
# :call-seq:
# rsa.public_encrypt(string) -> String
# rsa.public_encrypt(string, padding) -> String
#
# Encrypt +string+ with the public key. +padding+ defaults to
# PKCS1_PADDING, which is known to be insecure but is kept for backwards
# compatibility. The encrypted string output can be decrypted using
# #private_decrypt.
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#encrypt and PKey::PKey#decrypt instead.
def public_encrypt(data, padding = PKCS1_PADDING)
n or raise OpenSSL::PKey::RSAError, "incomplete RSA"
begin
encrypt(data, {
"rsa_padding_mode" => translate_padding_mode(padding),
})
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::RSAError, $!.message
end
end
# :call-seq:
# rsa.private_decrypt(string) -> String
# rsa.private_decrypt(string, padding) -> String
#
# Decrypt +string+, which has been encrypted with the public key, with the
# private key. +padding+ defaults to PKCS1_PADDING, which is known to be
# insecure but is kept for backwards compatibility.
#
# <b>Deprecated in version 3.0</b>.
# Consider using PKey::PKey#encrypt and PKey::PKey#decrypt instead.
def private_decrypt(data, padding = PKCS1_PADDING)
n or raise OpenSSL::PKey::RSAError, "incomplete RSA"
private? or raise OpenSSL::PKey::RSAError, "private key needed."
begin
decrypt(data, {
"rsa_padding_mode" => translate_padding_mode(padding),
})
rescue OpenSSL::PKey::PKeyError
raise OpenSSL::PKey::RSAError, $!.message
end
end
PKCS1_PADDING = 1
SSLV23_PADDING = 2
NO_PADDING = 3
PKCS1_OAEP_PADDING = 4
private def translate_padding_mode(num)
case num
when PKCS1_PADDING
"pkcs1"
when SSLV23_PADDING
"sslv23"
when NO_PADDING
"none"
when PKCS1_OAEP_PADDING
"oaep"
else
raise OpenSSL::PKey::PKeyError, "unsupported padding mode"
end
end
end
end