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.\" ========================================================================
.\"
.IX Title "LIFE_CYCLE-MAC 7ossl"
.TH LIFE_CYCLE-MAC 7ossl "2023-09-19" "3.0.11" "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 \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>.
|
