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Title "LIFE_CYCLE-DIGEST 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
life_cycle-digest - The digest algorithm life-cycle Header "DESCRIPTION" All message digests (MDs) go through a number of stages in their life-cycle: Item "start" This state represents the \s-1MD\s0 before it has been allocated. It is the starting state for any life-cycle transitions. Item "newed" This state represents the \s-1MD\s0 after it has been allocated. Item "initialised" This state represents the \s-1MD\s0 when it is set up and capable of processing input. Item "updated" This state represents the \s-1MD\s0 when it is set up and capable of processing additional input or generating output. Item "finaled" This state represents the \s-1MD\s0 when it has generated output. Item "freed" This state is entered when the \s-1MD\s0 is freed. It is the terminal state for all life-cycle transitions. Subsection "State Transition Diagram" The usual life-cycle of a \s-1MD\s0 is illustrated: +-------------------+ | start | +-------------------+ | | EVP_MD_CTX_new v +-------------------+ EVP_MD_CTX_reset | newed | <------------------------------+ +-------------------+ | | | | EVP_DigestInit | v | +-------------------+ | +--> | initialised | <+ EVP_DigestInit | | +-------------------+ | | | | | EVP_DigestUpdate | | | EVP_DigestUpdate | +------------------+ | | v | v | | | +------------------------------------------------+ | EVP_DigestInit | | updated | --+ | +------------------------------------------------+ | | | | | | | EVP_DigestFinal | EVP_DigestFinalXOF | | v v | | +------------------------------------------------+ | +--- | finaled | --+ +------------------------------------------------+ | | EVP_MD_CTX_free v +-------------------+ | freed | +-------------------+ Subsection "Formal State Transitions" This section defines all of the legal state transitions. This is the canonical list. Function Call --------------------- Current State ---------------------- start newed initialised updated finaled freed EVP_MD_CTX_new newed EVP_DigestInit initialised initialised initialised initialised EVP_DigestUpdate updated updated EVP_DigestFinal finaled EVP_DigestFinalXOF finaled EVP_MD_CTX_free freed freed freed freed freed EVP_MD_CTX_reset newed newed newed newed EVP_MD_CTX_get_params newed initialised updated EVP_MD_CTX_set_params newed initialised updated EVP_MD_CTX_gettable_params newed initialised updated EVP_MD_CTX_settable_params newed initialised updated Header "NOTES" At some point the \s-1EVP\s0 layer will begin enforcing the transitions described herein. Header "SEE ALSO" \fBprovider-digest\|(7), EVP_DigestInit\|(3) Header "COPYRIGHT" Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.

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>.