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Clarify participant ID changes

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teor 2021-05-13 18:39:17 +10:00 committed by Deirdre Connolly
parent df0ec420d4
commit 9529a8ee3e
1 changed files with 13 additions and 1 deletions
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14
rfcs/0001-messages.md
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@ -86,16 +86,28 @@ const BASIC_FROST_SERIALIZATION: MsgVersion = MsgVersion(0);
/// But in serialization, we want participants to be indexed from `0..n`,
/// where `n` is the number of participants.
/// This helps us look up their shares and commitments in serialized arrays.
/// So in serialization, we assign the dealer and aggregator to IDs `254` and `255`.
/// So in serialization, we assign the dealer and aggregator the highest IDs,
/// and mark those IDs as invalid for signers.
///
/// "When performing Shamir secret sharing, a polynomial `f(x)` is used to generate each party’s share of the secret. The actual secret is `f(0)` and the party with ID `i` will be given a share with value `f(i)`. Since a DKG may be implemented in the future, we recommend that the ID `0` be declared invalid."
/// https://raw.githubusercontent.com/ZcashFoundation/redjubjub/main/zcash-frost-audit-report-20210323.pdf#d
enum ParticipantId {
/// A serialized participant ID for a signer.
///
/// Must be less than or equal to `MAX_SIGNER_PARTICIPANT_ID`.
Signer(u8),
/// The fixed participant ID for the dealer.
Dealer,
/// The fixed participant ID for the aggregator.
Aggregator,
}
/// The fixed participant ID for the dealer.
const DEALER_PARTICIPANT_ID: u8 = u8::MAX - 1;
/// The fixed participant ID for the aggregator.
const AGGREGATOR_PARTICIPANT_ID: u8 = u8::MAX;
/// The maximum `ParticipantId::Signer` in this serialization format.
///
/// We reserve two participant IDs for the dealer and aggregator.