secret-sharing: Zeroize sensitive data #5928
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PrimeField implements the Copy trait, which means values are copied when passed as parameters. To prevent sensitive data from being replicated, the switch point struct should accumulate points rather than coordinates.
The AddAssign, SubAssign, and MulAssign functions can now be used only when the prime field supports zeroization. This ensures that any leftover data from heap reallocation, when the right-hand-side polynomial has more coefficients than the left-hand-side, is zeroized. An alternative solution is to remove these functions, but this could lead to performance drawbacks.
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