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Reject zero inputs in bls_modular_inverse()

This commit is contained in:
George Kadianakis 2023-03-16 15:49:40 +02:00
parent 9842fe5163
commit 0e0403d0e2
1 changed files with 4 additions and 3 deletions
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7
specs/deneb/polynomial-commitments.md
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@ -252,10 +252,11 @@ def compute_challenge(blob: Blob,
```python
def bls_modular_inverse(x: BLSFieldElement) -> BLSFieldElement:
"""
Compute the modular inverse of x
i.e. return y such that x * y % BLS_MODULUS == 1 and return 0 for x == 0
Compute the modular inverse of x (for x != 0)
i.e. return y such that x * y % BLS_MODULUS == 1
"""
return BLSFieldElement(pow(x, -1, BLS_MODULUS)) if x != 0 else BLSFieldElement(0)
assert (int(x) % BLS_MODULUS) != 0
return BLSFieldElement(pow(x, -1, BLS_MODULUS))
```
#### `div`