![]() Next, let’s CD to our home directory: cd ~ I like to uninstall the system packaged version of OpenSSL on my build machine to avoid any confusion: apt-get remove openssl We will also need zip in order to zip up our binary for transporting to the windows system which it will ultimately live: apt-get install zip We have an additional for the compilation dependency, mingw-64: sudo apt-get install mingw-w64 Now, let’s install some dependencies needed to build OpenSSL for Linux: apt-get install build-essential checkinstall zlib1g-dev -y Cross Compiling OpenSSL for Windows on Ubuntu 20.04 This indicates that our build was successful. Notice in the above that the “version” command against the binary functions, outputting the specific revision (j). ![]() Now, let’s make sure OpenSSL works correctly: cd /usr/local/bin/ Issue Ldconfig in order to rebuild the search path for libraries we've added to our installation ldconfig This will place a binary named openssl in /usr/local/bin/ Assuming it finishes successfully, issue make install Make install This will take several minutes to complete. configure script provided with the source, OpenSSL’s source directory includes a friendlier. I like to uninstall the system packaged version of OpenSSL on my build machine to avoid any confusion. We need to install Git so that we can pull down the source for OpenSSL apt-get install git apt-get install build-essential checkinstall zlib1g-dev -y Now, let’s install some dependencies needed to build OpenSSL for Linux. Start by making sure everything is up to date: apt-get update Compiling OpenSSL for Linux on Ubuntu 20.04 ![]() Therefore, we will be using Ubuntu 20.04 to compile OpenSSL natively with GCC, as well as to cross-compile OpenSSL for Windows via mingw-w64. However, it is the aim of this guide to produce an OpenSSL binary for both Linux and Windows with as little friction as possible. On Linux, GCC is the most common choice, but there is no reason you couldn’t use a compiler such as clang. In theory it is possible to compile OpenSSL for Windows directly on a windows machine using either Borland or Visual Studio. There are many compilers available for C on both Windows and Linux. Cross Compiling OpenSSL for Windows on Ubuntu 20.Compiling OpenSSL for Linux on Ubuntu 20.Whatever the reason, we have you covered. Perhaps you are developing a product on the bleeding edge and need to take advantage of a branch of OpenSSL which is not yet stable. Perhaps you need a specific version for security research that is no longer made available for good reason. Imagine if the C source were to be modified to send any generated private keys to an attacker on the internet!īeyond the threat of bad actors, there are a myriad of reasons why compiling OpenSSL yourself might be advantageous. Many independent parties offer a pre-compiled and packaged version of OpenSSL for Windows, but this requires a certain amount of trust in those third parties which personally makes me uncomfortable. On Windows systems, the answer is not so clear-cut. OpenSSL comes pre-packed with most Linux distributions, and most of the time, assuming your system is up to date, using the pre-packaged version from your trusted package manager is absolutely fine. While alternatives such as BoringSSL and LibreSSL do exist, OpenSSL is ubiquitous in the enterprise. OpenSSL is a popular library used for performing various actions around SSL/TLS such as generating keypairs, creating CSRs, and testing connectivity against endpoints encrypted via SSL/TLS. Why would I want to compile OpenSSL myself?
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