mirror of
https://github.com/logos-blockchain/logos-blockchain-specs.git
synced 2026-01-20 22:13:10 +00:00
7ffb7cc7ed
* Implement generator polynomial and rs encoding * Implement encode/decode+test using fft. Non-working * Use lagrange for interpolation * Remove fft, use evaluations instead * Move and rename kzg and rs test modules * Update docs * Added columns property to chunks matrix Added test for columns * Added chunkify and test * Added compute row commitments Added row commitments size test * Fix poly from evaluations method * Implement encode rows and test * Update encode row test * Implement compute row proofs (not working on extended data) * Use same polynomials for commitment and proof creation after extend * Fix polynomial from/to evaluations * Use chunks for verification * Refactor interpolate * Implement chunks matrix transposed method * Added compute column kzg commitments * Use square size data for encoder tests * Add column type to columns method * Added compute columns aggregated commitment Added aggregated commitment test Fixed and expanded encode test * Use sha3 for hashing * Make encoder hashing method public * Fill up verifier implementation * Added verify column test * Implement verier verify test Fixed small issues * Implement verier verify test Extend verify test for all columns
92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
from dataclasses import dataclass
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from hashlib import sha3_256
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from typing import List, Optional, Sequence
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from eth2spec.deneb.mainnet import BLSFieldElement
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from eth2spec.eip7594.mainnet import (
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KZGCommitment as Commitment,
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KZGProof as Proof,
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)
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from itertools import batched
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from da.common import Column, Chunk, Attestation
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from da.encoder import DAEncoder
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from da.kzg_rs import kzg
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from da.kzg_rs.common import ROOTS_OF_UNITY, GLOBAL_PARAMETERS, BLS_MODULUS
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@dataclass
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class DABlob:
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index: int
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column: Column
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column_commitment: Commitment
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aggregated_column_commitment: Commitment
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aggregated_column_proof: Proof
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rows_commitments: List[Commitment]
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rows_proofs: List[Proof]
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class DAVerifier:
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def __init__(self, sk: bytes):
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self.sk = sk
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@staticmethod
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def _verify_column(
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column: Column,
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column_commitment: Commitment,
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aggregated_column_commitment: Commitment,
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aggregated_column_proof: Proof,
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index: int
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) -> bool:
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# 1. compute commitment for column
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_, computed_column_commitment = kzg.bytes_to_commitment(column.as_bytes(), GLOBAL_PARAMETERS)
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# 2. If computed column commitment != column commitment, fail
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if column_commitment != computed_column_commitment:
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return False
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# 3. compute column hash
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column_hash = DAEncoder.hash_column_and_commitment(column, column_commitment)
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# 4. Check proof with commitment and proof over the aggregated column commitment
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chunk = BLSFieldElement.from_bytes(column_hash)
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return kzg.verify_element_proof(
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chunk, aggregated_column_commitment, aggregated_column_proof, index, ROOTS_OF_UNITY
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)
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@staticmethod
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def _verify_chunk(chunk: Chunk, commitment: Commitment, proof: Proof, index: int) -> bool:
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chunk = BLSFieldElement(int.from_bytes(bytes(chunk)) % BLS_MODULUS)
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return kzg.verify_element_proof(chunk, commitment, proof, index, ROOTS_OF_UNITY)
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@staticmethod
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def _verify_chunks(
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chunks: Sequence[Chunk],
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commitments: Sequence[Commitment],
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proofs: Sequence[Proof],
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index: int
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) -> bool:
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if not (len(chunks) == len(commitments) == len(proofs)):
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return False
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for chunk, commitment, proof in zip(chunks, commitments, proofs):
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if not DAVerifier._verify_chunk(chunk, commitment, proof, index):
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return False
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return True
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def _build_attestation(self, _blob: DABlob) -> Attestation:
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return Attestation()
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def verify(self, blob: DABlob) -> Optional[Attestation]:
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is_column_verified = DAVerifier._verify_column(
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blob.column,
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blob.column_commitment,
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blob.aggregated_column_commitment,
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blob.aggregated_column_proof,
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blob.index
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)
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if not is_column_verified:
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return
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are_chunks_verified = DAVerifier._verify_chunks(
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blob.column, blob.rows_commitments, blob.rows_proofs, blob.index
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)
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if not are_chunks_verified:
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return
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return self._build_attestation(blob)
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