Provided by: openssl_3.0.5-2ubuntu1_amd64 bug

NAME

       life_cycle-mac - The MAC algorithm life-cycle

DESCRIPTION

       All message authentication codes (MACs) go through a number of stages in their life-cycle:

       start
           This state represents the MAC before it has been allocated.  It is the starting state
           for any life-cycle transitions.

       newed
           This state represents the MAC after it has been allocated.

       initialised
           This state represents the MAC when it is set up and capable of processing input.

       updated
           This state represents the MAC when it is set up and capable of processing additional
           input or generating output.

       finaled
           This state represents the MAC when it has generated output.

       freed
           This state is entered when the MAC is freed.  It is the terminal state for all life-
           cycle transitions.

   State Transition Diagram
       The usual life-cycle of a MAC is illustrated:
                        +-------------------+
                        |       start       |
                        +-------------------+
                          |
                          | EVP_MAC_CTX_new
                          v
                        +-------------------+
                        |       newed       |
                        +-------------------+
                          |
                          | EVP_MAC_init
                          v
                        +-------------------+
                     +> |    initialised    | <+
                     |  +-------------------+  |
                     |    |                    |
                     |    | EVP_MAC_update     | EVP_MAC_init
                     |    v                    |
        EVP_MAC_init |  +-------------------+  |
                     |  |      updated      | -+
                     |  +-------------------+
                     |    |               |
                     |    | EVP_MAC_final | EVP_MAC_finalXOF
                     |    v               v
                     |  +-------------------+
                     +- |      finaled      |
                        +-------------------+
                          |
                          | EVP_MAC_CTX_free
                          v
                        +-------------------+
                        |       freed       |
                        +-------------------+

   Formal State Transitions
       This section defines all of the legal state transitions.  This is the canonical list.
        Function Call                   --------------------- Current State
       ----------------------
                                        start   newed    initialised   updated     finaled
       freed
        EVP_MAC_CTX_new                 newed
        EVP_MAC_init                         initialised initialised initialised initialised
        EVP_MAC_update                                     updated     updated
        EVP_MAC_final                                                  finaled
        EVP_MAC_finalXOF                                               finaled
        EVP_MAC_CTX_free                freed   freed       freed       freed       freed
        EVP_MAC_CTX_get_params                  newed    initialised   updated
        EVP_MAC_CTX_set_params                  newed    initialised   updated
        EVP_MAC_CTX_gettable_params             newed    initialised   updated
        EVP_MAC_CTX_settable_params             newed    initialised   updated

NOTES

       At some point the EVP layer will begin enforcing the transitions described herein.

SEE ALSO

       provider-mac(7), EVP_MAC(3).

HISTORY

       The provider MAC interface was introduced in OpenSSL 3.0.

COPYRIGHT

       Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except
       in compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.