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hwcrypto sha: Use spinlocks instead of semaphores for small state changes

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Significant performance improvement and smaller RAM footprint.
This commit is contained in:
Angus Gratton
2018-12-21 16:16:16 +11:00
committed by bot
parent f3277cf2dc
commit f141b29328
2 changed files with 20 additions and 11 deletions
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4
components/esp32/include/hwcrypto/sha.h
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@@ -166,6 +166,8 @@ void esp_sha_unlock_engine(esp_sha_type sha_type);
* while it is in use by the SHA engine. Caller should use esp_sha_wait_idle()
* to ensure the SHA engine is not reading from the memory block in hardware.
*
* @note This function enters a critical section. Do not block while holding this lock.
*
* @note You do not need to lock the memory block before calling esp_sha_block() or esp_sha_read_digest_state(), these functions handle memory block locking internally.
*
* Call esp_sha_unlock_memory_block() when done.
@@ -177,6 +179,8 @@ void esp_sha_lock_memory_block(void);
*
* Caller should have already locked a SHA engine before calling this function.
*
* This function releases the critical section entered by esp_sha_lock_memory_block().
*
* Call following esp_sha_lock_memory_block().
*/
void esp_sha_unlock_memory_block(void);