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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
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+.ie \n(.g .ds Aq \(aq
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+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD. Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
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+.\"
+.\" Required to disable full justification in groff 1.23.0.
+.if n .ds AD l
+.\" ========================================================================
+.\"
+.IX Title "LIFE_CYCLE-CIPHER 7ossl"
+.TH LIFE_CYCLE-CIPHER 7ossl 2026-04-07 3.5.6 OpenSSL
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+life_cycle\-cipher \- The cipher algorithm life\-cycle
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+All symmetric ciphers (CIPHERs) go through a number of stages in their
+life\-cycle:
+.IP start 4
+.IX Item "start"
+This state represents the CIPHER 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 CIPHER after it has been allocated.
+.IP initialised 4
+.IX Item "initialised"
+These states represent the CIPHER when it is set up and capable of processing
+input. There are three possible initialised states:
+.RS 4
+.IP "initialised using EVP_CipherInit" 4
+.IX Item "initialised using EVP_CipherInit"
+.PD 0
+.IP "initialised for decryption using EVP_DecryptInit" 4
+.IX Item "initialised for decryption using EVP_DecryptInit"
+.IP "initialised for encryption using EVP_EncryptInit" 4
+.IX Item "initialised for encryption using EVP_EncryptInit"
+.PD
+.RE
+.RS 4
+.RE
+.IP updated 4
+.IX Item "updated"
+These states represent the CIPHER when it is set up and capable of processing
+additional input or generating output. The three possible states directly
+correspond to those for initialised above. The three different streams should
+not be mixed.
+.IP finaled 4
+.IX Item "finaled"
+This state represents the CIPHER when it has generated output.
+.IP freed 4
+.IX Item "freed"
+This state is entered when the CIPHER 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 CIPHER is illustrated:
+ +---------------------------+
+ | |
+ | start |
+ | |
+ +---------------------------+ + - - - - - - - - - - - - - +
+ | \*(Aq any of the initialised \*(Aq
+ | EVP_CIPHER_CTX_new \*(Aq updated or finaled states \*(Aq
+ v \*(Aq \*(Aq
+ +---------------------------+ + - - - - - - - - - - - - - +
+ | | |
+ | newed | | EVP_CIPHER_CTX_reset
+ | | <----+
+ +---------------------------+
+ | | |
+ +---------+ | +---------+
+ EVP_DecryptInit | | EVP_CipherInit | EVP_EncryptInit
+ v v v
+ +---------------------------+ +---------------------------+ +---------------------------+
+ | | | | | |
+ | initialised | | initialised | | initialised |
+ | for decryption | | | | for encryption |
+ +---------------------------+ +---------------------------+ +---------------------------+
+ | | |
+ | EVP_DecryptUpdate | EVP_CipherUpdate EVP_EncryptUpdate |
+ | v |
+ | +---------------------------+ |
+ | | |--------------------+ |
+ | | updated | EVP_CipherUpdate | |
+ | | | <------------------+ |
+ v +---------------------------+ v
+ +---------------------------+ | +---------------------------+
+ | |---------------------+ | | |
+ | updated | EVP_DecryptUpdate | | | updated |------+
+ | for decryption | <-------------------+ | | for encryption | |
+ +---------------------------+ | +---------------------------+ |
+ | EVP_CipherFinal | | ^ |
+ +-------+ | +--------+ | |
+ EVP_DecryptFinal | | | EVP_EncryptFinal +-------------------+
+ v v v EVP_EncryptUpdate
+ +---------------------------+
+ | |-----------------------------+
+ | finaled | |
+ | | <---------------------------+
+ +---------------------------+ EVP_CIPHER_CTX_get_params
+ | (AEAD encryption)
+ | EVP_CIPHER_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 initialised updated finaled initialised updated initialised updated freed
+ decryption decryption encryption encryption
+ EVP_CIPHER_CTX_new newed
+ EVP_CipherInit initialised initialised initialised initialised initialised initialised initialised initialised
+ EVP_DecryptInit initialised initialised initialised initialised initialised initialised initialised initialised
+ decryption decryption decryption decryption decryption decryption decryption decryption
+ EVP_EncryptInit initialised initialised initialised initialised initialised initialised initialised initialised
+ encryption encryption encryption encryption encryption encryption encryption encryption
+ EVP_CipherUpdate updated updated
+ EVP_DecryptUpdate updated updated
+ decryption decryption
+ EVP_EncryptUpdate updated updated
+ encryption encryption
+ EVP_CipherFinal finaled
+ EVP_DecryptFinal finaled
+ EVP_EncryptFinal finaled
+ EVP_CIPHER_CTX_free freed freed freed freed freed freed freed freed freed
+ EVP_CIPHER_CTX_reset newed newed newed newed newed newed newed newed
+ EVP_CIPHER_CTX_get_params newed initialised updated initialised updated initialised updated
+ decryption decryption encryption encryption
+ EVP_CIPHER_CTX_set_params newed initialised updated initialised updated initialised updated
+ decryption decryption encryption encryption
+ EVP_CIPHER_CTX_gettable_params newed initialised updated initialised updated initialised updated
+ decryption decryption encryption encryption
+ EVP_CIPHER_CTX_settable_params newed initialised updated initialised updated initialised updated
+ decryption decryption encryption encryption
+.SH NOTES
+.IX Header "NOTES"
+At some point the EVP layer will begin enforcing the transitions described
+herein.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBprovider\-cipher\fR\|(7), \fBEVP_EncryptInit\fR\|(3)
+.SH COPYRIGHT
+.IX Header "COPYRIGHT"
+Copyright 2021 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+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>.
generated by cgit v1.2.3 (git 2.46.0) at 2026-05-15 13:04:01 +0000