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The goal here is to add public-key encryption. This is very similar to #20, however, use of public-key encryption instead of a shared password helps in certain compliance situations.
The use case is to allow any number of ZFS machines with a public key to upload backups to S3. This key can be freely shared throughout the organization without fear of compromise. When restoring, access to the private key is required.
Due to its use as a compression utility and the similar nature in which gpg is implemented to other compression utilities, it made more sense to add it as a compression option instead of extending the hard work of @kithrup in the pull request mentioned above.