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rust-openssl

Build Status

Documentation.

Warning

This README does not correspond to rust-openssl 0.7.x. See here for that README.

Building

rust-openssl depends on the OpenSSL runtime libraries version 1.0.1 or above. Currently the libraries need to be present in the build environment before this crate is compiled, and some instructions of how to do this are in the sections below.

Linux

On Linux, you can typically install OpenSSL via your package manager. The headers are sometimes provided in a separate package than the runtime libraries

  • look for something like openssl-devel or libssl-dev.
# On Ubuntu
sudo apt-get install libssl-dev
# On Arch Linux
sudo pacman -S openssl
# On Fedora
sudo dnf install openssl-devel

If installation via a package manager is not possible, or if you're cross compiling to a separate target, you'll typically need to compile OpenSSL from source. That can normally be done with:

curl -O https://www.openssl.org/source/openssl-1.1.0b.tar.gz
tar xf openssl-1.1.0b.tar.gz
cd openssl-1.1.0b
export CC=...
./Configure --prefix=... linux-x86_64 -fPIC
make -j$(nproc)
make install

OSX

Although OpenSSL 0.9.8 is preinstalled on OSX this library is being phased out of OSX and this crate also does not support this version of OpenSSL. To use this crate on OSX you'll need to install OpenSSL via some alternate means, typically homebrew:

brew install openssl

Windows MSVC

On MSVC it's unfortunately not always a trivial process acquiring OpenSSL. Perhaps the easiest way to do this right now is to download precompiled binaries and install them on your system. Currently it's recommended to install the 1.1.0b light installation if you're choosing this route.

Once a precompiled binary is installed you can configure this crate to find the installation via an environment variable:

set OPENSSL_DIR=C:\OpenSSL-Win64

After that, you're just a cargo build away!

Windows GNU (MinGW)

The easiest way to acquire OpenSSL when working with MinGW is to ensure you're using MSYS2 and to then execute:

# 32-bit
pacman -S mingw-w64-i686-openssl

# 64-bit
pacman -S mingw-w64-x86_64-openssl

And after that, a cargo build should be all you need!

Manual configuration

rust-openssl's build script will by default attempt to locate OpenSSL via pkg-config or other system-specific mechanisms. This will not work in some situations however, for example cross compiling or when using a copy of OpenSSL other than the normal system install.

The build script can be configured via environment variables:

  • OPENSSL_DIR - If specified, a directory that will be used to find OpenSSL installation. It's expected that under this directory the include folder has header files and a lib folder has the runtime libraries.
  • OPENSSL_STATIC - If specified, OpenSSL libraries will be statically rather than dynamically linked.

If OPENSSL_DIR is specified, then the build script will skip the pkg-config step.