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Combined helper measurement and helper proof seeds #1167

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@rozbb rozbb commented Dec 17, 2024

Before draft 12, the Prio3 sharding algorithm used different PRG seeds for the non-leader measurement share and the non-leader proof share. Since draft 12 (spec diff), these shares are generated from the same seed (with different domain separators). This PR updates the Prio3 sharding algorithm, and also has a few cleanups.

Closes a subtask of #1122.

@rozbb rozbb requested a review from a team as a code owner December 17, 2024 22:03
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