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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-KDF 7SSL"
.TH LIFE_CYCLE-KDF 7SSL 2024-02-03 3.1.5 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\-kdf \- The KDF algorithm life\-cycle
.SH DESCRIPTION
.IX Header "DESCRIPTION"
All key derivation functions (KDFs) and pseudo random functions (PRFs)
go through a number of stages in their life-cycle:
.IP start 4
.IX Item "start"
This state represents the KDF/PRF 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 KDF/PRF after it has been allocated.
.IP deriving 4
.IX Item "deriving"
This state represents the KDF/PRF when it is set up and capable of generating
output.
.IP freed 4
.IX Item "freed"
This state is entered when the KDF/PRF 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 KDF/PRF is illustrated:
+-------------------+
| start |
+-------------------+
|
| EVP_KDF_CTX_new
v
+-------------------+
| newed | <+
+-------------------+ |
| |
| EVP_KDF_derive |
v | EVP_KDF_CTX_reset
EVP_KDF_derive +-------------------+ |
+ - - - - - - - - | | |
' | deriving | |
+ - - - - - - - -> | | -+
+-------------------+
|
| EVP_KDF_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 deriving freed
EVP_KDF_CTX_new newed
EVP_KDF_derive deriving deriving
EVP_KDF_CTX_free freed freed freed
EVP_KDF_CTX_reset newed newed
EVP_KDF_CTX_get_params newed deriving
EVP_KDF_CTX_set_params newed deriving
EVP_KDF_CTX_gettable_params newed deriving
EVP_KDF_CTX_settable_params newed deriving
.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\-kdf\fR\|(7), \fBEVP_KDF\fR\|(3).
.SH HISTORY
.IX Header "HISTORY"
The provider KDF 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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