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Rewrite processor key-gen around the eVRF DKG

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Still a WIP.
This commit is contained in:
Luke Parker
2024-07-31 22:36:48 -04:00
parent fb7e966b94
commit 12f74e1813
6 changed files with 382 additions and 497 deletions
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28
crypto/dkg/src/evrf/mod.rs
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@@ -491,14 +491,26 @@ where
// We check at least t key shares of people have participated in contributing entropy
// Since the key shares of the participants exceed t, meaning if they're malicious they can
// reconstruct the key regardless, this is safe to the threshold
let mut participating_weight = 0;
for i in valid.keys() {
let evrf_public_key = evrf_public_keys[usize::from(u16::from(*i)) - 1];
participating_weight +=
evrf_public_keys.iter().filter(|key| **key == evrf_public_key).count();
}
if participating_weight < usize::from(t) {
return Ok(VerifyResult::NotEnoughParticipants);
{
let mut participating_weight = 0;
let mut evrf_public_keys = evrf_public_keys.to_vec();
for i in valid.keys() {
let evrf_public_key = evrf_public_keys[usize::from(u16::from(*i)) - 1];
// We remove all keys considered participating from the Vec in order to ensure they aren't
// counted multiple times. That could happen if a participant shares a key with another
// participant. While that's presumably some degree of invalid, we're robust against it
// regardless.
let start_len = evrf_public_keys.len();
evrf_public_keys.retain(|key| *key != evrf_public_key);
let end_len = evrf_public_keys.len();
let count = start_len - end_len;
participating_weight += count;
}
if participating_weight < usize::from(t) {
return Ok(VerifyResult::NotEnoughParticipants);
}
}
// If we now have >= t participations, calculate the group key and verification shares