Following the instructions from https://docs.github.com/en/actions/security-for-github-actions/security-guides/using-secrets-in-github-actions, a zip file called REFPROP.zip is placed in this repo containing the folders MIXTURES, FLUIDS, and FORTRAN.

On windows, to get gpg via chocolatey:

choco install gpg4win

, then restart restart the shell. Other platforms have gpg available by default

Choose your passphrase and place in the passphrase file. Perhaps auto-generated.

Execute:

gpg --passphrase `cat passphrase` -c --symmetric --cipher-algo AES256 --batch REFPROP.zip

which generates the encrypted file REFPROP.zip.gpg.

Add a repository secret called REFPROP_GPG_PASSPHRASE in github actions with the contents of the password you generated in the previous step. The action in this repository will test the decryption and print out the contents of the zip file, as well as building a shared library based on the sources in the encrypted zip.