Version 2.0.0
=============

This is the first release of openssl gem, formerly a standard library of Ruby,
ext/openssl. This is the successor of the version included in Ruby 2.3.

Compatibility notes
-------------------

* Support for OpenSSL version 0.9.6 and 0.9.7 is completely removed. openssl gem
  still works with OpenSSL 0.9.8, but users are strongly encouraged to upgrade
  to at least 1.0.1, as OpenSSL < 1.0.1 will not receive any security fixes from
  the OpenSSL development team.

Supported platforms
-------------------

* OpenSSL 1.0.0, 1.0.1, 1.0.2, 1.1.0
* OpenSSL < 0.9.8 is no longer supported.
* LibreSSL 2.3, 2.4, 2.5
* Ruby 2.3, 2.4

Notable changes
---------------

* Add support for OpenSSL 1.1.0. [[Feature #12324]](https://bugs.ruby-lang.org/issues/12324)
* Add support for LibreSSL

* OpenSSL::Cipher

  - OpenSSL::Cipher#key= and #iv= reject too long inputs. They used to truncate
    silently. [[Bug #12561]](https://bugs.ruby-lang.org/issues/12561)

  - OpenSSL::Cipher#iv_len= is added. It allows changing IV (nonce) length if
    using AEAD ciphers.
    [[Bug #8667]](https://bugs.ruby-lang.org/issues/8667),
    [[Bug #10420]](https://bugs.ruby-lang.org/issues/10420),
    [[GH ruby/ruby#569]](https://github.com/ruby/ruby/pull/569),
    [[GH ruby/openssl#58]](https://github.com/ruby/openssl/pull/58)

  - OpenSSL::Cipher#auth_tag_len= is added. This sets the authentication tag
    length to be generated by an AEAD cipher.

* OpenSSL::OCSP

  - Accessor methods are added to OpenSSL::OCSP::CertificateId.
    [[Feature #7181]](https://bugs.ruby-lang.org/issues/7181)

  - OpenSSL::OCSP::Request and BasicResponse can be signed with non-SHA-1 hash
    algorithm. [[Feature #11552]](https://bugs.ruby-lang.org/issues/11552)

  - OpenSSL::OCSP::CertificateId and BasicResponse can be encoded into DER.

  - A new class OpenSSL::OCSP::SingleResponse is added for convenience.

  - OpenSSL::OCSP::BasicResponse#add_status accepts absolute times. They used to
    accept only relative seconds from the current time.

* OpenSSL::PKey

  - OpenSSL::PKey::EC follows the general PKey interface.
    [[Bug #6567]](https://bugs.ruby-lang.org/issues/6567)

  - OpenSSL::PKey.read raises OpenSSL::PKey::PKeyError instead of ArgumentError
    for consistency with OpenSSL::PKey::{DH,DSA,RSA,EC}#new.
    [[Bug #11774]](https://bugs.ruby-lang.org/issues/11774),
    [[GH ruby/openssl#55]](https://github.com/ruby/openssl/pull/55)

  - OpenSSL::PKey::EC::Group retrieved by OpenSSL::PKey::EC#group is no longer
    linked with the EC key. Modifications to the EC::Group have no effect on the
    key. [[GH ruby/openssl#71]](https://github.com/ruby/openssl/pull/71)

  - OpenSSL::PKey::EC::Point#to_bn allows specifying the point conversion form
    by the optional argument.

* OpenSSL::SSL

  - OpenSSL::SSL::SSLSocket#tmp_key is added. A client can call it after the
    connection is established to retrieve the ephemeral key.
    [[GH ruby/ruby#1318]](https://github.com/ruby/ruby/pull/1318)

  - The automatic ephemeral ECDH curve selection is enabled by default when
    built with OpenSSL >= 1.0.2 or LibreSSL.

  - OpenSSL::SSL::SSLContext#security_level= is added. You can set the "security
    level" of the SSL context. This is effective only when built with OpenSSL
    1.1.0.

  - A new option 'verify_hostname' is added to OpenSSL::SSL::SSLContext. When it
    is enabled, and the SNI hostname is also set, the hostname verification on
    the server certificate is automatically performed. It is now enabled by
    OpenSSL::SSL::Context#set_params.
    [[GH ruby/openssl#60]](https://github.com/ruby/openssl/pull/60)

Removals
--------

* OpenSSL::Engine

  - OpenSSL::Engine.cleanup does nothing when built with OpenSSL 1.1.0.

* OpenSSL::SSL

  - OpenSSL::PKey::DH::DEFAULT_512 is removed. Hence servers no longer use
    512-bit DH group by default. It is considered too weak nowadays.
    [[Bug #11968]](https://bugs.ruby-lang.org/issues/11968),
    [[GH ruby/ruby#1196]](https://github.com/ruby/ruby/pull/1196)

  - RC4 cipher suites are removed from OpenSSL::SSL::SSLContext::DEFAULT_PARAMS.
    RC4 is now considered to be weak.
    [[GH ruby/openssl#50]](https://github.com/ruby/openssl/pull/50)

Deprecations
------------

* OpenSSL::PKey

  - OpenSSL::PKey::RSA#n=, #e=, #d=, #p=, #q=, #dmp1=, #dmq1=, #iqmp=,
    OpenSSL::PKey::DSA#p=, #q=, #g=, #priv_key=, #pub_key=,
    OpenSSL::PKey::DH#p=, #g=, #priv_key= and #pub_key= are deprecated. They are
    disabled when built with OpenSSL 1.1.0, due to its API change. Instead,
    OpenSSL::PKey::RSA#set_key, #set_factors, #set_crt_params,
    OpenSSL::PKey::DSA#set_pqg, #set_key, OpenSSL::PKey::DH#set_pqg and #set_key
    are added.

* OpenSSL::Random

  - OpenSSL::Random.pseudo_bytes is deprecated, and not defined when built with
    OpenSSL 1.1.0. Use OpenSSL::Random.random_bytes instead.

* OpenSSL::SSL

  - OpenSSL::SSL::SSLContext#tmp_ecdh_callback is deprecated, as the underlying
    API SSL_CTX_set_tmp_ecdh_callback() is removed in OpenSSL 1.1.0. It was
    first added in Ruby 2.3.0. To specify the curve to be used in ephemeral
    ECDH, use OpenSSL::SSL::SSLContext#ecdh_curves=. The automatic curve
    selection is also now enabled by default when built with a capable OpenSSL.