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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .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" \&\fIprovider\-rand\fR\|(7), \s-1\fIEVP_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 .