Grind signatures to low-r value

[devrandom]

It would be nice to have rust-lightning grind signatures to low-r value, possibly controlled by a feature gate. This makes the tx weight more predictable. Otherwise, there's a 50% chance for each signature to have an extra byte to represent the sign.

[moneyball]

Does this utility exist in rust-bitcoin?

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On Fri, Mar 25, 2022 at 6:04 AM Dev Random ***@***.***> wrote: It would be nice to have rust-lightning grind signatures to low-r value, possibly controlled by a feature gate. This makes the tx weight more predictable. Otherwise, there's a 50% chance for each signature to have an extra byte to represent the sign. — Reply to this email directly, view it on GitHub <#1387>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACPUA5N6MWNZTOELLYL25TVBW2VXANCNFSM5RUDJ2XQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[devrandom]

it's in libsecp, alongside the regular sign function, so it's really easy

[moneyball]

did ldk have a direct dependency on libsecp previously? does it now? (i assume rust-bitcoin handled this?)

[devrandom]

rust-bitcoin re-exports rust-libsecp, which is what lightning is and was using for signing ops. so no dependency changes, just another function.