I am asking about the double SHA256 hashing function - the one that bitcoin uses.

Which publicly available implementation is the fastest one out there?

It can be in assembler, as long as it is for x86, also 64 bit.

  • I suspect, that since SHA256 has no real weaknesses, you can't do 2x SHA256 faster than twice the time of one SHA256... – Janus Troelsen Mar 11 '14 at 11:13

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