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.\" ========================================================================
.\"
.IX Title "LIFE_CYCLE-PKEY 7ossl"
.TH LIFE_CYCLE-PKEY 7ossl "2023-09-19" "3.0.11" "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\-pkey \- The PKEY algorithm life\-cycle
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
All public keys (PKEYs) go through a number of stages in their life-cycle:
.IP "start" 4
.IX Item "start"
This state represents the \s-1PKEY\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-1PKEY\s0 after it has been allocated.
.IP "decapsulate" 4
.IX Item "decapsulate"
This state represents the \s-1PKEY\s0 when it is ready to perform a private key decapsulation
operation.
.IP "decrypt" 4
.IX Item "decrypt"
This state represents the \s-1PKEY\s0 when it is ready to decrypt some ciphertext.
.IP "derive" 4
.IX Item "derive"
This state represents the \s-1PKEY\s0 when it is ready to derive a shared secret.
.IP "digest sign" 4
.IX Item "digest sign"
This state represents the \s-1PKEY\s0 when it is ready to perform a private key signature
operation.
.IP "encapsulate" 4
.IX Item "encapsulate"
This state represents the \s-1PKEY\s0 when it is ready to perform a public key encapsulation
operation.
.IP "encrypt" 4
.IX Item "encrypt"
This state represents the \s-1PKEY\s0 when it is ready to encrypt some plaintext.
.IP "key generation" 4
.IX Item "key generation"
This state represents the \s-1PKEY\s0 when it is ready to generate a new public/private key.
.IP "parameter generation" 4
.IX Item "parameter generation"
This state represents the \s-1PKEY\s0 when it is ready to generate key parameters.
.IP "verify" 4
.IX Item "verify"
This state represents the \s-1PKEY\s0 when it is ready to verify a public key signature.
.IP "verify recover" 4
.IX Item "verify recover"
This state represents the \s-1PKEY\s0 when it is ready to recover a public key signature data.
.IP "freed" 4
.IX Item "freed"
This state is entered when the \s-1PKEY\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-1PKEY\s0 object is illustrated:
+-------------+
| |
| start |
| |
EVP_PKEY_derive +-------------+
+-------------+ EVP_PKEY_derive_set_peer | +-------------+
| |----------------------------+ | +----------------------------| |
| derive | | | | EVP_PKEY_verify | verify |
| |<---------------------------+ | +--------------------------->| |
+-------------+ | +-------------+
^ | ^
| EVP_PKEY_derive_init | EVP_PKEY_verify_init |
+---------------------------------------+ | +---------------------------------------+
| | |
+-------------+ | | | +-------------+
| |----------------------------+ | | | +----------------------------| |
| digest sign | EVP_PKEY_sign | | | | | EVP_PKEY_verify_recover | verify |
| |<---------------------------+ | | | +--------------------------->| recover |
+-------------+ | | | +-------------+
^ | | | ^
| EVP_PKEY_sign_init | | | EVP_PKEY_verify_recover_init |
+---------------------------------+ | | | +---------------------------------+
| | | | |
+-------------+ | | | | | +-------------+
| |----------------------------+ | | | | | +----------------------------| |
| decapsulate | EVP_PKEY_decapsulate | | | | | | | EVP_PKEY_decrypt | decrypt |
| |<---------------------------+ | | v | | +--------------------------->| |
+-------------+ | +-------------+ | +-------------+
^ +---| |---+ ^
| EVP_PKEY_decapsulate_init | | EVP_PKEY_decrypt_init |
+-------------------------------------| newed |-------------------------------------+
| |
+---| |---+
+-------------+ | +-------------+ | +-------------+
| |----------------------------+ | | | | +----------------------------| |
| encapsulate | EVP_PKEY_encapsulate | | | | | | EVP_PKEY_encrypt | encrypt |
| |<---------------------------+ | | | | +--------------------------->| |
+-------------+ | | | | +-------------+
^ | | | | ^
| EVP_PKEY_encapsulate_init | | | | EVP_PKEY_encrypt_init |
+---------------------------------+ | | +---------------------------------+
| |
+---------------------------------------+ +---------------------------------------+
| EVP_PKEY_paramgen_init EVP_PKEY_keygen_init |
v v
+-------------+ +-------------+
| |----------------------------+ +----------------------------| |
| parameter | | | | key |
| generation |<---------------------------+ +--------------------------->| generation |
+-------------+ EVP_PKEY_paramgen EVP_PKEY_keygen +-------------+
EVP_PKEY_gen EVP_PKEY_gen
+ - - - - - + +-----------+
' ' EVP_PKEY_CTX_free | |
' any state '------------------->| 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 digest verify verify encrypt decrypt derive encapsulate decapsulate parameter key freed
sign recover generation generation
EVP_PKEY_CTX_new newed
EVP_PKEY_CTX_new_id newed
EVP_PKEY_CTX_new_from_name newed
EVP_PKEY_CTX_new_from_pkey newed
EVP_PKEY_sign_init digest digest digest digest digest digest digest digest digest digest digest
sign sign sign sign sign sign sign sign sign sign sign
EVP_PKEY_sign digest
sign
EVP_PKEY_verify_init verify verify verify verify verify verify verify verify verify verify verify
EVP_PKEY_verify verify
EVP_PKEY_verify_recover_init verify verify verify verify verify verify verify verify verify verify verify
recover recover recover recover recover recover recover recover recover recover recover
EVP_PKEY_verify_recover verify
recover
EVP_PKEY_encrypt_init encrypt encrypt encrypt encrypt encrypt encrypt encrypt encrypt encrypt encrypt encrypt
EVP_PKEY_encrypt encrypt
EVP_PKEY_decrypt_init decrypt decrypt decrypt decrypt decrypt decrypt decrypt decrypt decrypt decrypt decrypt
EVP_PKEY_decrypt decrypt
EVP_PKEY_derive_init derive derive derive derive derive derive derive derive derive derive derive
EVP_PKEY_derive_set_peer derive
EVP_PKEY_derive derive
EVP_PKEY_encapsulate_init encapsulate encapsulate encapsulate encapsulate encapsulate encapsulate encapsulate encapsulate encapsulate encapsulate encapsulate
EVP_PKEY_encapsulate encapsulate
EVP_PKEY_decapsulate_init decapsulate decapsulate decapsulate decapsulate decapsulate decapsulate decapsulate decapsulate decapsulate decapsulate decapsulate
EVP_PKEY_decapsulate decapsulate
EVP_PKEY_paramgen_init parameter parameter parameter parameter parameter parameter parameter parameter parameter parameter parameter
generation generation generation generation generation generation generation generation generation generation generation
EVP_PKEY_paramgen parameter
generation
EVP_PKEY_keygen_init key key key key key key key key key key key
generation generation generation generation generation generation generation generation generation generation generation
EVP_PKEY_keygen key
generation
EVP_PKEY_gen parameter key
generation generation
EVP_PKEY_CTX_get_params newed digest verify verify encrypt decrypt derive encapsulate decapsulate parameter key
sign recover generation generation
EVP_PKEY_CTX_set_params newed digest verify verify encrypt decrypt derive encapsulate decapsulate parameter key
sign recover generation generation
EVP_PKEY_CTX_gettable_params newed digest verify verify encrypt decrypt derive encapsulate decapsulate parameter key
sign recover generation generation
EVP_PKEY_CTX_settable_params newed digest verify verify encrypt decrypt derive encapsulate decapsulate parameter key
sign recover generation generation
EVP_PKEY_CTX_free freed freed freed freed freed freed freed freed freed freed freed 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"
\&\fBEVP_PKEY_new\fR\|(3),
\&\fBEVP_PKEY_decapsulate\fR\|(3), \fBEVP_PKEY_decrypt\fR\|(3), \fBEVP_PKEY_encapsulate\fR\|(3),
\&\fBEVP_PKEY_encrypt\fR\|(3), \fBEVP_PKEY_derive\fR\|(3), \fBEVP_PKEY_keygen\fR\|(3),
\&\fBEVP_PKEY_sign\fR\|(3), \fBEVP_PKEY_verify\fR\|(3), \fBEVP_PKEY_verify_recover\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The provider \s-1PKEY\s0 interface was introduced in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2021\-2023 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
<https://www.openssl.org/source/license.html>.
|
