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...orms MD5. > > > > The other alternative would be to go for xxHash64 [0] which has the > > superior performance but provides a non-cryptographic hash so I though > > SHA1 would be better here. > > [...] > > With respect to *both* speed and security, wouldn't BLAKE3 be a better, > modern alternative if we're looking at checksumming? > It's "[r]eleased into the public domain with CC0 1.0. Alternatively, it is > licensed under the Apache License 2.0". And the performance (see the chart > at https://github.com/BLAKE3-team/BLAKE3) is...

From: Sebastian Andrzej Siewior <sebastian at breakpoint.cc> This is a huge all-in-one patch and deserves a little cleanup and splitting. However, I wanted to get it out here for some feedback. My primar motivation to use SHA1 for checksumming (by default) instead of MD5 is not the additional security bits but performance. On a decent x86 box the SHA1 performance is almost the same as