gnupg: symcryptrun
9.10 Call a simple symmetric encryption tool
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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.
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