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int casting to avoid underflow

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Hsiao-Wei Wang 2022-09-27 17:50:03 +08:00
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specs/eip4844/polynomial-commitments.md
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@ -329,7 +329,7 @@ def compute_kzg_proof(polynomial: Polynomial, z: BLSFieldElement) -> KZGProof:
# Make sure we won't divide by zero during division
assert z not in ROOTS_OF_UNITY
denominator_poly = [(x - z) % BLS_MODULUS for x in bit_reversal_permutation(ROOTS_OF_UNITY)]
denominator_poly = [(int(x) - z) % BLS_MODULUS for x in bit_reversal_permutation(ROOTS_OF_UNITY)]
# Calculate quotient polynomial by doing point-by-point division
quotient_polynomial = [div(a, b) for a, b in zip(polynomial_shifted, denominator_poly)]