Building OpenSSL with Visual Studio

Downloads

I provide downloads for Visual Studio 2010 and 2015. I had to remove my 2013 installation due to space constraints, but the build files are still there so you can do it, too.

Building OpenSSL automatically

Because the process of building OpenSSL is time consuming and error prone, I wrote a couple of batch scripts that simplify the process significantly. You can download them here. Inside, you will find three batch files:

• rebuild_openssl_vs2010.cmd for use with Visual Studio 2010
• rebuild_openssl_vs2013.cmd for use with Visual Studio 2013
• rebuild_openssl_vs2015.cmd for use with Visual Studio 2015

Prerequisites

• The script assumes you are on Windows.
• The script assumes you have Visual Studio 2010, 2013 or 2015 installed in all the usual places. Important: If you have a different installation folder, your mileage may vary
• The script assumes you have downloaded an OpenSSL tarball, like this one.
• The script assumes you have Python (2.7 or 3.x) installed and on your PATH
• The script assumes you have 7-zip installed (doesn't need to be on your PATH)
• Choose the script you want to use and edit it. For example, let's take a look at the top of rebuild_openssl_vs2015.cmd:
  

  T:
  set OPENSSL_VERSION=1.0.1p
  set SEVENZIP="C:\Program Files\7-Zip\7z.exe"
  set VS2015="C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat"
  set VS2015_AMD64="C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\vcvars64.bat"
  

  so it is pretty easy to see: you must enter the OpenSSL version manually, the rest should have sensible defaults...

• Note: The script uses the SUBST T:\ drive for building OpenSSL.

Building the OpenSSL binaries

• Place the tar.gz file (not the unpacked .tar) in the root of T:\
• Double-click on one of the rebuild_openssl-vs*.cmd.

That's it, it will do all the hard work for you and present nicely packaged binaries. Great fun!

Building OpenSSL manually

OK, so you don't trust me. Right. Well, here is how you can do it manually.... Note: This article wouldn't have been possible without the invaluable help of this article. However, it was obviously not built on a Windows 8 machine, and it didn't include any binaries. So this article follows the same basic structure, but it has some important differences:

• The instructions default to the DLL build
  Why? because that is the one used by Python. And because I was rebuilding Python, I was rebuilding OpenSSL in the first place. So there.
• Debug build uses .PDBs

Prerequisites

• You need Visual Studio 2010, 2013 or 2015.
• You need to install Perl. I used ActivePerl 5.16.3 for Windows (x86).
• You need the OpenSSL sourcecode. In the following, both the 1.0.1 and 1.0.2 branches are supported.
• Unzip the sourcecode.
• Create two different copies of the sourcecode. I am going to follow the conventions of the original article and create T:\openssl-src-32 and T:\openssl-src-64.
• You need a development prompt. This varies based on your compiler:
  • Visual Studio 2010, 32-bit: Open Visual Studio Command Prompt (2010)
  • Visual Studio 2010, 64-bit: Open Visual Studio x64 Win64 Command Prompt (2010)
  • Visual Studio 2013, 32-bit: Open CMD.EXE and run C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\vcvars32.bat
  • Visual Studio 2013, 64-bit: Open CMD.EXE and run C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\vcvars64.bat
  • Visual Studio 2015, 32-bit: Open CMD.EXE and run C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\vcvars32.bat
  • Visual Studio 2015, 64-bit: Open CMD.EXE and run C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\vcvars64.bat

Building the 32-bit Release DLL

• Change to the source directory, for example T:\openssl-src-32
• Run perl Configure VC-WIN32 --prefix=T:\Build-OpenSSL-VC32-Release-DLL. This will make T:\Build-OpenSSL-VC32-Release-DLLyour output directory; it should be fairly obvious how you can change that.
• Run ms\do_ms
• If you are on the 1.0.2 branch, you must do the following: Run ms\do_nasm.
  This step is not necessary if you are on 1.0.1
• Run nmake -f ms\ntdll.mak
• Run nmake -f ms\ntdll.mak install

Building the 32-bit Debug DLL

• Change to the source directory, for example T:\openssl-src-32
• Run perl Configure debug-VC-WIN32 --prefix=T:\Build-OpenSSL-VC32-Debug-DLL
• Run ms\do_ms
• If you are on the 1.0.2 branch, you must do the following: Run ms\do_nasm.
  This step is not necessary if you are on 1.0.1
• Run nmake -f ms\ntdll.mak
• Run nmake -f ms\ntdll.mak install

Building the 32-bit Release Static Library

• Change to the source directory, for example T:\openssl-src-32
• Run perl Configure VC-WIN32 --prefix=T:\Build-OpenSSL-VC32-Release-DLL. This will make T:\Build-OpenSSL-VC32-Release-DLLyour output directory; it should be fairly obvious how you can change that.
• Run ms\do_ms
• If you are on the 1.0.2 branch, you must do the following: Run ms\do_nasm.
  This step is not necessary if you are on 1.0.1
• Run nmake -f ms\nt.mak
• Run nmake -f ms\nt.mak install

Building the 32-bit Debug Static Library

• Change to the source directory, for example T:\openssl-src-32
• Run perl Configure debug-VC-WIN32 --prefix=T:\Build-OpenSSL-VC32-Debug-DLL
• Run ms\do_ms
• If you are on the 1.0.2 branch, you must do the following: Run ms\do_nasm.
  This step is not necessary if you are on 1.0.1
• Run nmake -f ms\nt.mak
• Run nmake -f ms\nt.mak install

Building the 64-bit Release DLL

• Change to the source directory, for example T:\openssl-src-64
• Run perl Configure VC-WIN64A --prefix=T:\Build-OpenSSL-VC64-Release-DLL. This will make T:\Build-OpenSSL-VC64-Release-DLL your output directory; it should be fairly obvious how you can change that.
• Run ms\do_win64a
• Run nmake -f ms\ntdll.mak
• Run nmake -f ms\ntdll.mak install

Building the 64-bit Debug DLL

• Change to the source directory, for example T:\openssl-src-64
• Run perl Configure debug-VC-WIN64A --prefix=T:\Build-OpenSSL-VC64-Debug-DLL
• Run ms\do_win64a
• Run nmake -f ms\ntdll.mak
• Run nmake -f ms\ntdll.mak install

Building the 64-bit Release Static Library

• Change to the source directory, for example T:\openssl-src-32
• Run perl Configure VC-WIN64A --prefix=T:\Build-OpenSSL-VC64-Release-Static. This will make T:\Build-OpenSSL-VC64-Release-Static your output directory; it should be fairly obvious how you can change that.
• Run ms\do_win64a
• Run nmake -f ms\nt.mak
• Run nmake -f ms\nt.mak install

Building the 64-bit Debug Static Library

• Change to the source directory, for example T:\openssl-src-64
• Run perl Configure debug-VC-WIN64A --prefix=T:\Build-OpenSSL-VC64-Debug-DLL
• Run ms\do_win64a
• Run nmake -f ms\nt.mak
• Run nmake -f ms\nt.mak install

FAQ

Why did I need to create two different copies of the sourcecode

Because the OpenSSL build scripts will use the folder outdll32 for both the 32-bit and the 64-bit output, so there is no easy way to distinguish both builds.

Note: Special thanks to Alex (see https://github.com/CpServiceSpb/OpenSSLOcsp) for pointing out some mistakes in the documentation of the 64-bit build. Should be fine now.