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Re:The BitTorrent Protocol Specification v2 by simias on Tuesday August 08, 2017 @04:35AM (#14955769)
Nobody gets fired for choosing SHA-256. It's the de-facto standard these days, it's the most likely to have hardware acceleration etc... I think it's a pretty conservative choice.

Furthermore I don't think hash performance is very critical for bittorrent, after all it's generally I/O bound.

Could you even exploit length extension with bittorrent? Given that it cuts files in chunks of the same size it sounds pretty hard to sneak extra bytes in there.

Re:The BitTorrent Protocol Specification v2 by loup-vaillant on Tuesday August 08, 2017 @04:45AM (#14955810)
> hardware acceleration

Ah, that would explain a lot. (Not in this particular case, but why it seems to be the default choice in many settings).

> Could you even exploit length extension with bittorrent?

No Idea. I was just responding to a general point.