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

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.IX Title "LIFE_CYCLE-RAND 7ossl"
.TH LIFE_CYCLE-RAND 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\-rand \- The RAND algorithm life\-cycle
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
All random number generator (RANDs)
go through a number of stages in their life-cycle:
.IP "start" 4
.IX Item "start"
This state represents the \s-1RAND\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-1RAND\s0 after it has been allocated but unable to
generate any output.
.IP "instantiated" 4
.IX Item "instantiated"
This state represents the \s-1RAND\s0 when it is set up and capable of generating
output.
.IP "uninstantiated" 4
.IX Item "uninstantiated"
This state represents the \s-1RAND\s0 when it has been shutdown and it is no longer
capable of generating output.
.IP "freed" 4
.IX Item "freed"
This state is entered when the \s-1RAND\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-1RAND\s0 is illustrated:
                        +-------------------------+
                        |          start          |
                        +-------------------------+
                          |
                          | EVP_RAND_CTX_new
                          v
                        +-------------------------+
                        |          newed          |
                        +-------------------------+
                          |
                          | EVP_RAND_instantiate
                          v
    EVP_RAND_generate   +-------------------------+
  +-------------------- |                         |
  |                     |      instantiated       |
  +-------------------> |                         | <+
                        +-------------------------+  '
                          |                          '
                          | EVP_RAND_uninstantiate   ' EVP_RAND_instantiate
                          v                          '
                        +-------------------------+  '
                        |     uninstantiated      | -+
                        +-------------------------+
                          |
                          | EVP_RAND_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   instantiated  uninstantiated  freed
 EVP_RAND_CTX_new           newed
 EVP_RAND_instantiate            instantiated
 EVP_RAND_generate                          instantiated
 EVP_RAND_uninstantiate                    uninstantiated
 EVP_RAND_CTX_free          freed   freed      freed          freed
 EVP_RAND_CTX_get_params            newed   instantiated  uninstantiated  freed
 EVP_RAND_CTX_set_params            newed   instantiated  uninstantiated  freed
 EVP_RAND_CTX_gettable_params       newed   instantiated  uninstantiated  freed
 EVP_RAND_CTX_settable_params       newed   instantiated  uninstantiated  freed
.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\-rand\fR\|(7), \s-1\fBEVP_RAND\s0\fR\|(3).
.SH "HISTORY"
.IX Header "HISTORY"
The provider \s-1RAND\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>.