CCM is only meant for packet mode where the length of the input is known in
advance. Since it is a packet mode function, CCM only had one function that
performs the protocol.
However, incremental authentication is usefull in some usecases. It also
ensure some kind of coherencies when processing with a given authentication
mode or another. To achieve this aim, this commit adds the following functions:
ccm_init()
ccm_add_aad()
cm_add_nonce()
ccm_process()
ccm_done()
ccm_reset()
as well as the data structure
ccm_state
Change-Id: I5225a42bb098708c4af07518b561bb00f85bc243
