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.\" -*- mode: troff; coding: utf-8 -*-
.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
.\"
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.\" ========================================================================
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.\"
.\" If the F register is >0, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD. Of course, you'll have to process the
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.\" ========================================================================
.\"
.IX Title "LIFE_CYCLE-MAC 7ssl"
.TH LIFE_CYCLE-MAC 7ssl 2024-01-30 3.2.1 OpenSSL
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
life_cycle\-mac \- The MAC algorithm life\-cycle
.SH DESCRIPTION
.IX Header "DESCRIPTION"
All message authentication codes (MACs)
go through a number of stages in their life-cycle:
.IP start 4
.IX Item "start"
This state represents the MAC before it has been allocated. It is the
starting state for any life-cycle transitions.
.IP newed 4
.IX Item "newed"
This state represents the MAC after it has been allocated.
.IP initialised 4
.IX Item "initialised"
This state represents the MAC when it is set up and capable of processing
input.
.IP updated 4
.IX Item "updated"
This state represents the MAC when it is set up and capable of processing
additional input or generating output.
.IP finaled 4
.IX Item "finaled"
This state represents the MAC when it has generated output.
.IP freed 4
.IX Item "freed"
This state is entered when the MAC is freed. It is the terminal state
for all life-cycle transitions.
.SS "State Transition Diagram"
.IX Subsection "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 |
+-------------------+
.SS "Formal State Transitions"
.IX Subsection "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
.SH NOTES
.IX Header "NOTES"
At some point the EVP layer will begin enforcing the transitions described
herein.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBprovider\-mac\fR\|(7), \fBEVP_MAC\fR\|(3).
.SH HISTORY
.IX Header "HISTORY"
The provider MAC interface was introduced in OpenSSL 3.0.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
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>.
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