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Title "LIFE_CYCLE-PKEY 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
life_cycle-pkey - The PKEY algorithm life-cycle Header "DESCRIPTION" All public keys (PKEYs) go through a number of stages in their life-cycle: Item "start" This state represents the \s-1PKEY\s0 before it has been allocated. It is the starting state for any life-cycle transitions. Item "newed" This state represents the \s-1PKEY\s0 after it has been allocated. Item "decapsulate" This state represents the \s-1PKEY\s0 when it is ready to perform a private key decapsulation operation. Item "decrypt" This state represents the \s-1PKEY\s0 when it is ready to decrypt some ciphertext. Item "derive" This state represents the \s-1PKEY\s0 when it is ready to derive a shared secret. Item "digest sign" This state represents the \s-1PKEY\s0 when it is ready to perform a private key signature operation. Item "encapsulate" This state represents the \s-1PKEY\s0 when it is ready to perform a public key encapsulation operation. Item "encrypt" This state represents the \s-1PKEY\s0 when it is ready to encrypt some plaintext. Item "key generation" This state represents the \s-1PKEY\s0 when it is ready to generate a new public/private key. Item "parameter generation" This state represents the \s-1PKEY\s0 when it is ready to generate key parameters. Item "verify" This state represents the \s-1PKEY\s0 when it is ready to verify a public key signature. Item "verify recover" This state represents the \s-1PKEY\s0 when it is ready to recover a public key signature data. Item "freed" This state is entered when the \s-1PKEY\s0 is freed. It is the terminal state for all life-cycle transitions. 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 | ' ' | | + - - - - - + +-----------+ 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 Header "NOTES" At some point the \s-1EVP\s0 layer will begin enforcing the transitions described herein. Header "SEE ALSO" \fBEVP_PKEY_new\|(3), \fBEVP_PKEY_decapsulate\|(3), EVP_PKEY_decrypt\|(3), EVP_PKEY_encapsulate\|(3), \fBEVP_PKEY_encrypt\|(3), EVP_PKEY_derive\|(3), EVP_PKEY_keygen\|(3), \fBEVP_PKEY_sign\|(3), EVP_PKEY_verify\|(3), EVP_PKEY_verify_recover\|(3) Header "HISTORY" The provider \s-1PKEY\s0 interface was introduced in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2021-2023 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>.