What is OpenSSL
OpenSSL is a tool used to create a key for mobile apps on Facebook. For anyone who doesn’t use command prompt, like ever, figuring out how to use this tool sucks. So, for my sanity when making my next app, and for anyone else’s sanity who is sick of looking at tutorials from people who don’t know how to give proper detailed directions to people who are learning, I created this tutorial. Please keep in mind, I am using Windows 7, 64 bit, and I am using Unity 5.
Download the current OpenSSL zip file.
Unzip the file. Open up your C: drive. create a folder (directory) named OpenSSL. Open this folder. Paste the contents of the folder you just unzipped into the OpenSSL folder.
Make sure all of your hidden files can be seen. Directions to unhide your files are here.
Now, open the directory .android. On my machine, it looks like this:
See if the debug.keystore file is there. If it is, skip ahead to step 7. If it is not, continue to step 6.
Launch your Android Studio and create a new project. Once the project is created, check to make sure that a debug.keystore file has been created in your .android directory.
Click Next below