LIFE_CYCLE-MAC
Section: OpenSSL (7SSL)
Updated: 2024-03-03
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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>.
Index
- NAME
-
- DESCRIPTION
-
- State Transition Diagram
-
- Formal State Transitions
-
- NOTES
-
- SEE ALSO
-
- HISTORY
-
- COPYRIGHT
-
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Time: 15:46:05 GMT, May 11, 2024