LIFE_CYCLE-RAND - Online Linux Manual PageSection : 7SSL
Updated : 2022-08-14
Source : 3.0.5
Note : OpenSSL
NAMElife_cycle−rand − The RAND algorithm life−cycle
DESCRIPTIONAll random number generator (RANDs) go through a number of stages in their life-cycle: start This state represents the RAND before it has been allocated. It is the starting state for any life-cycle transitions. newed This state represents the RAND after it has been allocated but unable to generate any output. instantiated This state represents the RAND when it is set up and capable of generating output. uninstantiated This state represents the RAND when it has been shutdown and it is no longer capable of generating output. freed This state is entered when the RAND is freed. It is the terminal state for all life-cycle transitions.
State Transition DiagramThe usual life-cycle of a RAND 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 |
+-------------------------+
Formal State TransitionsThis 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
NOTESAt some point the EVP layer will begin enforcing the transitions described herein.
SEE ALSOprovider−rand (7), EVP_RAND (3).
HISTORYThe provider RAND interface was introduced in OpenSSL 3.0.
COPYRIGHTCopyright 2021 The OpenSSL Project Authors. All Rights Reserved. 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>. 0
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