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Use blake2b for 31 bytes digests (#91)

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Daniel Sanchez 2024-04-15 12:12:50 +02:00 committed by GitHub
parent 8bb5160ff2
commit 9390d481ba
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1 changed files with 3 additions and 3 deletions
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da/encoder.py
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@ -1,7 +1,7 @@
from dataclasses import dataclass from dataclasses import dataclass
from itertools import batched, chain from itertools import batched, chain
from typing import List, Sequence, Tuple from typing import List, Sequence, Tuple
from hashlib import sha3_256 from hashlib import blake2b
from eth2spec.eip7594.mainnet import KZGCommitment as Commitment, KZGProof as Proof, BLSFieldElement from eth2spec.eip7594.mainnet import KZGCommitment as Commitment, KZGProof as Proof, BLSFieldElement
@ -130,7 +130,7 @@ class DAEncoder:
@staticmethod @staticmethod
def hash_column_and_commitment(column: Column, commitment: Commitment) -> bytes: def hash_column_and_commitment(column: Column, commitment: Commitment) -> bytes:
# TODO: Check correctness of bytes to blsfieldelement using modulus over the hash
return ( return (
int.from_bytes(sha3_256(column.as_bytes() + bytes(commitment)).digest()) % BLS_MODULUS # digest size must be 31 bytes as we cannot encode 32 without risking overflowing the BLS_MODULUS
int.from_bytes(blake2b(column.as_bytes() + bytes(commitment), digest_size=31).digest())
).to_bytes(32, byteorder="big") ).to_bytes(32, byteorder="big")