CESA_HASH_BLOCK_SIZE_MSK
index = creq->len & CESA_HASH_BLOCK_SIZE_MSK;
new_cache_ptr = len & CESA_HASH_BLOCK_SIZE_MSK;
len &= ~CESA_HASH_BLOCK_SIZE_MSK;
len &= CESA_HASH_BLOCK_SIZE_MSK;
len &= ~CESA_HASH_BLOCK_SIZE_MSK;