gpgme-ffi

https://github.com/ueno/ruby-gpgme

Ruby-GPGME is a Ruby language binding of GPGME (GnuPG Made Easy). GnuPG Made Easy (GPGME) is a library designed to make access to GnuPG easier for applications. It provides a High-Level Crypto API for encryption, decryption, signing, signature verification and key management.