9.10 Call a simple symmetric encryption tool

Sometimes simple encryption tools are already in use for a long time and there might be a desire to integrate them into the GnuPG framework. The protocols and encryption methods might be non-standard or not even properly documented, so that a full-fledged encryption tool with an interface like gpg is not doable. symcryptrun provides a solution: It operates by calling the external encryption/decryption module and provides a passphrase for a key using the standard pinentry based mechanism through gpg-agent.

Note, that symcryptrun is only available if GnuPG has been configured with ‘--enable-symcryptrun’ at build time.