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Supersedes #640.
This commit is contained in:
Luke Parker
2025-01-18 12:31:11 -05:00
parent 2a19e9da93
commit cb906242e7
17 changed files with 36 additions and 31 deletions
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18
crypto/frost/src/sign.rs
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@@ -203,14 +203,15 @@ pub trait SignMachine<S>: Send + Sync + Sized {
/// SignatureMachine this SignMachine turns into.
type SignatureMachine: SignatureMachine<S, SignatureShare = Self::SignatureShare>;
/// Cache this preprocess for usage later. This cached preprocess MUST only be used once. Reuse
/// of it enables recovery of your private key share. Third-party recovery of a cached preprocess
/// also enables recovery of your private key share, so this MUST be treated with the same
/// security as your private key share.
/// Cache this preprocess for usage later.
///
/// This cached preprocess MUST only be used once. Reuse of it enables recovery of your private
/// key share. Third-party recovery of a cached preprocess also enables recovery of your private
/// key share, so this MUST be treated with the same security as your private key share.
fn cache(self) -> CachedPreprocess;
/// Create a sign machine from a cached preprocess.
///
/// After this, the preprocess must be deleted so it's never reused. Any reuse will presumably
/// cause the signer to leak their secret share.
fn from_cache(
@@ -219,11 +220,14 @@ pub trait SignMachine<S>: Send + Sync + Sized {
cache: CachedPreprocess,
) -> (Self, Self::Preprocess);
/// Read a Preprocess message. Despite taking self, this does not save the preprocess.
/// It must be externally cached and passed into sign.
/// Read a Preprocess message.
///
/// Despite taking self, this does not save the preprocess. It must be externally cached and
/// passed into sign.
fn read_preprocess<R: Read>(&self, reader: &mut R) -> io::Result<Self::Preprocess>;
/// Sign a message.
///
/// Takes in the participants' preprocess messages. Returns the signature share to be broadcast
/// to all participants, over an authenticated channel. The parties who participate here will
/// become the signing set for this session.