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* feat: Add cryptfs storage backend for filename encryption This commit introduces a new storage backend called `cryptfs`. This backend encrypts the filenames of secrets to enhance privacy while maintaining compatibility with existing VCS backends like Git. Key features: - For each secret, a cryptographically secure hash (SHA-256) of its name is generated and used as the filename for the underlying storage. - A mapping from the original secret name to the hashed filename is maintained in an encrypted file (`.gopass-mapping.age`) within the repository. - The mapping file is encrypted using the `age` encryption backend, with recipients read from the store's `.age-recipients` file. - The `cryptfs` backend is implemented as a wrapper around any existing storage backend (e.g., `gitfs`, `fs`), which can be configured by the user. - The backend is registered with gopass and can be enabled by setting `storage: cryptfs` in the store's configuration. This implementation addresses issue #2634. * [fix] Fix lint errors Signed-off-by: Dominik Schulz <dominik.schulz@gauner.org> * [chore] Fix the remaining tests and add some docs. Signed-off-by: Dominik Schulz <dominik.schulz@gauner.org> --------- Signed-off-by: Dominik Schulz <dominik.schulz@gauner.org> Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com> Co-authored-by: Dominik Schulz <dominik.schulz@gauner.org>
