esp-idf

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Angus Gratton 36b65c8498 hwcrypto sha: Allow SHA contexts to be shared between tasks

Previously, hardware SHA engine "locks" were mutex semaphores. This meant that the task which
started a particular SHA session (in hardware) needed to finalise that session, or an invalid
FreeRTOS state was created.

Replace with binary semaphore which can be shared between tasks.

Includes a unit test, but unit test doesn't crash even without this fix
(some other unknown condition is required).

2019-01-23 18:18:38 +08:00