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### 7.10 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.