Android_verify/third_party/android-libs/share/man/man7/life_cycle-mac.7ossl

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.\" ========================================================================
.\"
.IX Title "LIFE_CYCLE-MAC 7ossl"
.TH LIFE_CYCLE-MAC 7ossl "2024-09-03" "3.3.2" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.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 \s-1MAC\s0 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 \s-1MAC\s0 after it has been allocated.
.IP "initialised" 4
.IX Item "initialised"
This state represents the \s-1MAC\s0 when it is set up and capable of processing
input.
.IP "updated" 4
.IX Item "updated"
This state represents the \s-1MAC\s0 when it is set up and capable of processing
additional input or generating output.
.IP "finaled" 4
.IX Item "finaled"
This state represents the \s-1MAC\s0 when it has generated output.
.IP "freed" 4
.IX Item "freed"
This state is entered when the \s-1MAC\s0 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 \s-1MAC\s0 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 \s-1EVP\s0 layer will begin enforcing the transitions described
herein.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBprovider\-mac\fR\|(7), \s-1\fBEVP_MAC\s0\fR\|(3).
.SH "HISTORY"
.IX Header "HISTORY"
The provider \s-1MAC\s0 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 \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.