OpenSSL bindings for Go

Forked from https://github.com/libp2p/openssl (unmaintained) to add:

1. Fix build by golang 1.13.
2. Fix build on Apple M1.
3. Fix static build.
4. Fix error extraction on key reading.
5. Bindings for DANE.

License

Copyright (C) 2017. See AUTHORS.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Using on macOS

1. Install homebrew
2. $ brew install openssl or $ brew install openssl@1.1

Using on Windows

1. Install mingw-w64
2. Install pkg-config-lite
3. Build (or install precompiled) openssl for mingw32-w64
4. Set PKG_CONFIG_PATH to the directory containing openssl.pc (i.e. c:\mingw64\mingw64\lib\pkgconfig)