236 lines
8.6 KiB
Plaintext
236 lines
8.6 KiB
Plaintext
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.\" ========================================================================
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.\"
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.IX Title "LIFE_CYCLE-DIGEST 7ossl"
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.TH LIFE_CYCLE-DIGEST 7ossl "2024-01-30" "3.2.1" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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life_cycle\-digest \- The digest algorithm life\-cycle
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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All message digests (MDs) go through a number of stages in their life-cycle:
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.IP "start" 4
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.IX Item "start"
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This state represents the \s-1MD\s0 before it has been allocated. It is the
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starting state for any life-cycle transitions.
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.IP "newed" 4
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.IX Item "newed"
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This state represents the \s-1MD\s0 after it has been allocated.
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.IP "initialised" 4
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.IX Item "initialised"
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This state represents the \s-1MD\s0 when it is set up and capable of processing
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input.
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.IP "updated" 4
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.IX Item "updated"
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This state represents the \s-1MD\s0 when it is set up and capable of processing
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additional input or generating output.
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.IP "finaled" 4
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.IX Item "finaled"
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This state represents the \s-1MD\s0 when it has generated output.
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.IP "freed" 4
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.IX Item "freed"
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This state is entered when the \s-1MD\s0 is freed. It is the terminal state
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for all life-cycle transitions.
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.SS "State Transition Diagram"
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.IX Subsection "State Transition Diagram"
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The usual life-cycle of a \s-1MD\s0 is illustrated:
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+-------------------+
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| start |
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+-------------------+
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| EVP_MD_CTX_new
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v
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+-------------------+ EVP_MD_CTX_reset
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| newed | <------------------------------+
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+-------------------+ |
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| |
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| EVP_DigestInit |
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v |
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+-------------------+ |
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+--> | initialised | <+ EVP_DigestInit |
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| +-------------------+ | |
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| | | EVP_DigestUpdate |
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| | EVP_DigestUpdate | +------------------+ |
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| v | v | |
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| +------------------------------------------------+ |
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EVP_DigestInit | | updated | --+
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| +------------------------------------------------+ |
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| | | |
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| | EVP_DigestFinal | EVP_DigestFinalXOF |
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| v v |
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| +------------------------------------------------+ |
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+--- | finaled | --+
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+------------------------------------------------+
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| EVP_MD_CTX_free
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v
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+-------------------+
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| freed |
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+-------------------+
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.SS "Formal State Transitions"
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.IX Subsection "Formal State Transitions"
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This section defines all of the legal state transitions.
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This is the canonical list.
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Function Call --------------------- Current State ----------------------
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start newed initialised updated finaled freed
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EVP_MD_CTX_new newed
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EVP_DigestInit initialised initialised initialised initialised
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EVP_DigestUpdate updated updated
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EVP_DigestFinal finaled
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EVP_DigestFinalXOF finaled
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EVP_MD_CTX_free freed freed freed freed freed
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EVP_MD_CTX_reset newed newed newed newed
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EVP_MD_CTX_get_params newed initialised updated
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EVP_MD_CTX_set_params newed initialised updated
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EVP_MD_CTX_gettable_params newed initialised updated
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EVP_MD_CTX_settable_params newed initialised updated
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.SH "NOTES"
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.IX Header "NOTES"
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At some point the \s-1EVP\s0 layer will begin enforcing the transitions described
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herein.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIprovider\-digest\fR\|(7), \fIEVP_DigestInit\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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