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<p dir="auto">There are two reasons: first, the first block in ctx->prev_block never seems to be used anywhere. Thus, maintaining this ctx->prev_block would be meaningless these days. It used to be there to perform the memcmp with the current block to implement the FIPS 140-2 continuous self test. That is not required any more and thus the memcmp was removed. Yet, the copying of the previous block was still present.</p>

<p dir="auto">Second, for the ACVP testing, we need the very first block after initializaing a DRBG instance. In the past, I set the ctx->prev_block_present to 1 immediately after initializing in my test harness. But somehow that did not work. Instead of spending time to debug it, I felt to completely remove the code that seems to serve no purpose any more.</p>

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