Speed up flatten_challenge_matrix by using u128 instead of Scalar. #62
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Switch to using independent random psi instead of powers of some base psi and implement most of the computation in flatten_challenge_matrix with u128 instead of Scalar. The change to psi is necessary to make the implementation in u128 possible. This change reduces the runtime of flatten_challenge_matrix by a factor of 3, thus speeding up the client message creation by 17%. PiperOrigin-RevId: 853718141
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Speed up flatten_challenge_matrix by using u128 instead of Scalar.
Switch to using independent random psi instead of powers of some base psi and implement most of the computation in flatten_challenge_matrix with u128 instead of Scalar. The change to psi is necessary to make the implementation in u128 possible. This change reduces the runtime of flatten_challenge_matrix by a factor of 3, thus speeding up the client message creation by 17%.