Hi Peff, On Wed, 1 Mar 2017, Jeff King wrote: > I do think that could argue for turning on the collision detection only > during object-write operations, which is where it matters. It would be > really trivial to flip the "check collisions" bit on sha1dc. But I > suspect you could go faster still by compiling against two separate > implementations: the fast-as-possible one (which could be openssl or > blk-sha1), and the slower-but-careful sha1dc. Given the speed difference between OpenSSL and sha1dc, it would be a wise thing indeed to do sha1dc only where objects enter from possibly untrusted sources, and use OpenSSL for all other hashing. Ciao, Johannes