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Title "LIFE_CYCLE-KDF 7" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
life_cycle-kdf - The KDF algorithm life-cycle Header "DESCRIPTION" All key derivation functions (KDFs) and pseudo random functions (PRFs) go through a number of stages in their life-cycle: Item "start" This state represents the \s-1KDF/PRF\s0 before it has been allocated. It is the starting state for any life-cycle transitions. Item "newed" This state represents the \s-1KDF/PRF\s0 after it has been allocated. Item "deriving" This state represents the \s-1KDF/PRF\s0 when it is set up and capable of generating output. Item "freed" This state is entered when the \s-1KDF/PRF\s0 is freed. It is the terminal state for all life-cycle transitions. Subsection "State Transition Diagram" The usual life-cycle of a \s-1KDF/PRF\s0 is illustrated: +-------------------+ | start | +-------------------+ | | EVP_KDF_CTX_new v +-------------------+ | newed | <+ +-------------------+ | | | | EVP_KDF_derive | v | EVP_KDF_CTX_reset EVP_KDF_derive +-------------------+ | + - - - - - - - - | | | ' | deriving | | + - - - - - - - -> | | -+ +-------------------+ | | EVP_KDF_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 deriving freed EVP_KDF_CTX_new newed EVP_KDF_derive deriving deriving EVP_KDF_CTX_free freed freed freed EVP_KDF_CTX_reset newed newed EVP_KDF_CTX_get_params newed deriving EVP_KDF_CTX_set_params newed deriving EVP_KDF_CTX_gettable_params newed deriving EVP_KDF_CTX_settable_params newed deriving Header "NOTES" At some point the \s-1EVP\s0 layer will begin enforcing the transitions described herein. Header "SEE ALSO" \fBprovider-kdf\|(7), \s-1EVP_KDF\s0\|(3). Header "HISTORY" The provider \s-1KDF\s0 interface was introduced in OpenSSL 3.0. 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>.