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I have a project that relies in the OpenSSL library that compiles fine on the Linux environment, but I am having trouble having it compile on MS Visual Studio 2015.

I have many errors that look something like "_ specifies undefined struct/union _" where the first blank is a local variable and the second is a reference to something from OpenSSL. I believe that the error is currently coming from not having a proper link to the library from my IDE.

I have downloaded a precompiled version from http://slproweb.com/products/Win32OpenSSL.html and I have set the project's 'Additional Include Directories' to OpenSSL-Win64/include, 'Additional Library Directories' to OpenSSl-Win64/lib, and 'Additional Dependencies' to libssl.lib. - all files or directories that I have gotten through the precompiled package.

Does anyone who has had experience using OpenSSl for Visual Studio projects have any idea as to what my problem is?

Thank you!

Zach Choi
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  • Use OpenSSL 1.0.2; *not* OpenSSL 1.1.0. Also see [Error: “invalid use of incomplete type ‘RSA {aka struct rsa_st}” in OpenSSL 1.1.0](https://stackoverflow.com/q/40549318/608639), [Visual Studio and error C2027: use of undefined type 'rsa_st' in OpenSSL 1.1.0](https://stackoverflow.com/q/41348281/608639), [EVP_get_cipherbyname and “undefined struct/union evp_cipher_st” in OpenSSL 1.1.0](https://stackoverflow.com/q/41909017/608639), etc. – jww May 31 '17 at 19:35
  • Is there a reason why I should be using 1.0.2 instead? – Zach Choi Jun 01 '17 at 14:36
  • After switching to 1.0.2, I think I've gotten a little further and now I have new errors being messages such as error LNK2001: unresolved external symbol _EVP_DecryptUpdate My additional directories and library directories are still the same, but for my additional dependencies I have only libeay32.lib. Is this the problem? Sorry I am not familiar with the Visual Studio platform – Zach Choi Jun 01 '17 at 14:45

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