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Bug #13100

closed

OpenSSL::PKey::EC#public_keyでGroup情報がコピーされない。

Added by azuchi (Shigeyuki Azuchi) about 7 years ago. Updated over 3 years ago.

Status:
Rejected
Assignee:
-
Target version:
-
ruby -v:
ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
[ruby-dev:49945]
Tags:

Description

OpenSSL::PKey::EC#public_key= で公開鍵(OpenSSL::PKey::EC::Point)をセットし、その公開鍵のgroupのエンコーディング方式を:compressedにセットした後、OpenSSL::PKey::EC#public_keyで再度公開鍵を取得するとそのgroupのエンコーディング方式が:compressedではなく、:uncompressedのままになります。

2.3.0では:compressedが取得できており、2.4からこの現象が発生します。

OpenSSL::PKey::EC#public_keyで公開鍵を取得する際に、元々のgroupのエンコーディング方式がコピーされてないのではないでしょうか?

以下テストコードです。

require "test/unit"

class OpenSSL::TestEC < Test::Unit::TestCase

  def test_point_conversion_form
    pub_key = '03cdd34ec0a05d91c026fe8cb74434923075d3acc20f3f673fb855c8f2c04ca522' # compressed pubkey
    key = OpenSSL::PKey::EC.new("secp256k1")

    # success 2.4 and 2.3
    point = OpenSSL::PKey::EC::Point.new(key.group, OpenSSL::BN.new(pub_key, 16))
    point.group.point_conversion_form = :compressed
    assert_equal point.group.point_conversion_form, :compressed

    # success 2.3, but fail 2.4
    key.public_key = OpenSSL::PKey::EC::Point.new(key.group, OpenSSL::BN.new(pub_key, 16))
    key.public_key.group.point_conversion_form = :compressed
    assert_equal key.public_key.group.point_conversion_form, :compressed
  end

end

Updated by znz (Kazuhiro NISHIYAMA) about 7 years ago

  • Status changed from Open to Assigned
  • Assignee set to 7150

Updated by jeremyevans0 (Jeremy Evans) over 3 years ago

  • Status changed from Assigned to Rejected

This is expected and documented behavior since https://github.com/ruby/openssl/commit/9435c8b3cab02a78375cb43e122e4cfc7eee79b9, where key.group returns a new group, and modifying that group does not affect the key.

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