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

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.\" ========================================================================
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.IX Title "LIFE_CYCLE-KDF 7ossl"
.TH LIFE_CYCLE-KDF 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\-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 \s-1KDF/PRF\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-1KDF/PRF\s0 after it has been allocated.
.IP "deriving" 4
.IX Item "deriving"
This state represents the \s-1KDF/PRF\s0 when it is set up and capable of generating
output.
.IP "freed" 4
.IX Item "freed"
This state is entered when the \s-1KDF/PRF\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-1KDF/PRF\s0 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 \s-1EVP\s0 layer will begin enforcing the transitions described
herein.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBprovider\-kdf\fR\|(7), \s-1\fBEVP_KDF\s0\fR\|(3).
.SH "HISTORY"
.IX Header "HISTORY"
The provider \s-1KDF\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>.