fors33-verifier 0.1.0

Verify attested data segments. Standalone SHA-256 verification for data provenance.

fors33-verifier

Standalone verification for attested data segments. Confirm that a data segment matches a published SHA-256 hash.

Install

pip install fors33-verifier

Usage

Remote (presigned URL, full file):

fors33-verifier --url "https://..." --expected-hash <sha256_hex>

Remote (HTTP Range, segment only):

fors33-verifier --url "https://..." --start 0 --end 1048576 --expected-hash <sha256_hex>

Local full file:

fors33-verifier --file /path/to/segment.csv --expected-hash <sha256_hex>

Local segment (direct byte range):

fors33-verifier --file /path/to/data.csv --start 0 --end 4096 --expected-hash <sha256_hex>

Local segment (using attestation record):

fors33-verifier --file /path/to/data.csv --record /path/to/attestation_record.json

The attestation record JSON must contain byte_start, byte_end, and hash. Uses memory-efficient chunked reading (64KB) so large files do not cause OOM.

Output

System-log format with timestamp, target, SHA-256, and status. Exits 0 on match, 1 on mismatch.

Requirements

Python 3.9+. Uses only standard library (hashlib, json, argparse, urllib.request).

License

MIT License. See LICENSE file.