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Design document: https://docs.google.com/document/d/1EjiCuXoiy8DEEXe15KxVJ4iWrwogCyG113_0LdzcWzQ/edit?usp=drive_web&ouid=102644738301620637153 This is the third of multiple patchsets to support encryption and decryption in airshipctl Complete feature: https://review.opendev.org/#/c/742695/ Change-Id: Ibe1060a83d11233cccaa3d3989765968a4dbed76