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:
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.
The provider MAC interface was introduced in OpenSSL 3.0.
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