--- Log opened Fri Apr 23 00:00:34 2021
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07:32 < waxwing> From BIP340: "The function hashtag(x) where tag is a UTF-8 encoded tag name and x is a byte array returns the 32-byte hash SHA256(SHA256(tag) || SHA256(tag) || x)."
07:32 < waxwing> is it intention to use 'tag' twice there? in uses below, it seems like there are maybe two distinct tags allowed? (e.g. "BIP340" and "challenge")
07:34 < waxwing> oh, apparently it's literally like that, according to: https://github.com/bitcoin-core/secp256k1/blob/1e5d50fa93d71d751b95eec6a80f6732879a0071/src/modules/schnorrsig/main_impl.h#L96-L98
07:35 < waxwing> is there an easy to explain reason why the two?
07:40 < nickler> waxwing: Because this is a 64-byte long context-specific constant and the SHA256 block size is also 64 bytes, optimized implementations are possible (identical to SHA256 itself, but with a modified initial state).
07:41 < nickler> (it's mentioned in the bip, ctrl-f "tagged hashes")
07:50 < waxwing> i see thanks nickler
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--- Log closed Sat Apr 24 00:00:35 2021