This README does not correspond to rust-openssl 0.7.x or 0.8.x. See here for that README.
rust-openssl depends on OpenSSL version 1.0.1 or above, or LibreSSL. Both the libraries and headers 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.
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
libssl-dev. You will also need the regular development utilities, like
pkg-config, as the custom build script relies on them.
# On Debian and Ubuntu # On Arch Linux # On Fedora
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-1.1.0f.tar.gz tar xf openssl-1.1.0f.tar.gz cd openssl-1.1.0f export CC=... ./Configure --prefix=... linux-x86_64 -fPIC make -j$(nproc) make install
Although OpenSSL 0.9.8 is preinstalled on OSX this library is being phased out of OSX and this crate also does not support that version of OpenSSL. To use this crate on OSX you'll need to install OpenSSL via some alternate means, typically Homebrew:
Occasionally an update of XCode or MacOS will cause the linker to fail after compilation, to rectify this you may want to try and run:
If Homebrew is installed to the default location of
/usr/local, OpenSSL will be
On MSVC it's unfortunately not always a trivial process acquiring OpenSSL. A couple of possibilities are downloading precompiled binaries for OpenSSL 1.1.0, or installing OpenSSL 1.0.2 using vcpkg.
Installing OpenSSL 1.1.0 using precompiled binaries
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 1.1.0 (non-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:
Now you will need to install root certificates.
Installing OpenSSL 1.0.2 using vcpkg
Install vcpkg, and install the OpenSSL port like this:
vcpkg install openssl:x64-windows set VCPKG_ROOT=c:\path\to\vcpkg\installation cargo build
Acquiring Root Certificates
Neither of the above OpenSSL distributions ship with any root certificates.
So to make requests to servers on the internet, you have to install them
manually. Download the cacert.pem file from here, copy it somewhere safe
C:\OpenSSL-Win64\certs is a good place) and point the
environment variable there:
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!
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
includefolder has header files and a
libfolder has the runtime libraries.
OPENSSL_LIB_DIR- If specified, a directory that will be used to find OpenSSL libraries. Overrides the
libfolder implied by
OPENSSL_INCLUDE_DIR- If specified, a directory that will be used to find OpenSSL header files. Overrides the
includefolder implied by
OPENSSL_STATIC- If specified, OpenSSL libraries will be statically rather than dynamically linked.
OPENSSL_LIBS- If specified, the names of the OpenSSL libraries that will be linked, e.g.
OPENSSL_INCLUDE_DIR is specified,
then the build script will skip the pkg-config step.
For target-specific configuration, each of these environment variables can be
prefixed by an upper-cased target, for example,
X86_64_UNKNOWN_LINUX_GNU_OPENSSL_DIR. This can be useful in cross compilation
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed under the terms of both the Apache License, Version 2.0 and the MIT license without any additional terms or conditions.