Module refresh_coordinator 

Proactive share refresh coordinator.

Herzberg proactive refresh rotates shares without changing the joint public key. The coordinator orchestrates:

1. Generate refresh shares (random polynomial at x=0 = 0)
2. Distribute to all parties
3. Each party sums their received refresh shares
4. Each party adds the sum to their existing share

Structs

RefreshContribution

A refresh contribution from one party.

RefreshSession

A refresh session.

Functions

generate_contribution

Generate a refresh contribution from one party. Each share is random; the constraint is that the polynomial evaluates to 0 at x=0 (so the joint key doesn’t change).