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This is based on AES256-CTS-HMAC384-192 crypto algorithm per RFC 8009 (i.e. Kerberos 5, hence the name) with custom-defined key usage numbers. The implementation allows a given key to have/be linked to between one and three usage numbers. The existing CEPH_CRYPTO_AES remains in place and unchanged. The usage_slot parameter that needed to be added to ceph_crypt() and its wrappers is simply ignored there. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>