life_cycle-mac - The MAC algorithm life-cycle
All message authentication codes (MACs) go through a number of stages in their life-cycle:
This state represents the MAC before it has been allocated. It is the starting state for any life-cycle transitions.
This state represents the MAC after it has been allocated.
This state represents the MAC when it is set up and capable of processing input.
This state represents the MAC when it is set up and capable of processing additional input or generating output.
This state represents the MAC when it has generated output.
This state is entered when the MAC is freed. It is the terminal state for all life-cycle transitions.
The usual life-cycle of a MAC is illustrated: +-------------------+ | start | +-------------------+ | | EVP_MAC_CTX_new v +-------------------+ | newed | +-------------------+ | | EVP_MAC_init v +-------------------+ +> | initialised | <+ | +-------------------+ | | | | | | EVP_MAC_update | EVP_MAC_init | v | EVP_MAC_init | +-------------------+ | | | updated | -+ | +-------------------+ | | | | | EVP_MAC_final | EVP_MAC_finalXOF | v v | +-------------------+ +- | finaled | +-------------------+ | | EVP_MAC_CTX_free v +-------------------+ | freed | +-------------------+
This section defines all of the legal state transitions. This is the canonical list. Function Call --------------------- Current State ---------------------- start newed initialised updated finaled freed EVP_MAC_CTX_new newed EVP_MAC_init initialised initialised initialised initialised EVP_MAC_update updated updated EVP_MAC_final finaled EVP_MAC_finalXOF finaled EVP_MAC_CTX_free freed freed freed freed freed EVP_MAC_CTX_get_params newed initialised updated EVP_MAC_CTX_set_params newed initialised updated EVP_MAC_CTX_gettable_params newed initialised updated EVP_MAC_CTX_settable_params newed initialised updated
At some point the EVP layer will begin enforcing the transitions described herein.
provider-mac (7), EVP_MAC (3).
The provider MAC interface was introduced in OpenSSL 3.0.
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