github/consensus-specs
1
1
Fork 0
mirror of https://github.com/ethereum/consensus-specs.git synced 2026-02-01 07:45:00 -05:00
Code Issues Packages Projects Releases Wiki Activity

Reject zero inputs in bls_modular_inverse()

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files

7
specs/deneb/polynomial-commitments.md
View File

@@ -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`