[ ] SHA-2 block FIFOs sizes : SHA-2 block contains two time a 8x64-bit size FIFOs (one for the hash and one for the digest)
[ ] HMAC extra latency : HMAC should introduce a latency equals to 240 extra cycles
[ ] MSG_LENGTH_LOWER register LSBs : Message length granularity should be in bytes, and these registers express it in bits, so the 3 LSBs from MSG_LENGTH_LOWER should be always zeros
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