---
license: cc-by-4.0
pretty_name: deps.dev package-file bloom filters (sha1 + sha256)
tags:
- bloom-filter
- file-hashes
---

# deps.dev package-file bloom filters

Membership filters over per-file hashes from Google's
[deps.dev](https://deps.dev) public BigQuery dataset
(`bigquery-public-data.deps_dev_v1`) — files inside npm, PyPI, Maven,
Go, NuGet, and Cargo package archives. deps.dev data is CC-BY-4.0
(attribution: Google / deps.dev).

- **172,425,526 keys each**: sha1 (UPPERCASE hex) and sha256
  (lowercase hex), p = 1e-4, 394 MiB each
- Extracted from the 2026-07-20 snapshot partition via BigQuery
  free-tier sandbox queries ($0)
- Package-registry coverage evolves; this is a point-in-time extract

## Rebuild

`EXTRACT.md` in this repo documents the exact BigQuery queries and
the free-tier setup (billing-free sandbox project, `tabledata.list`
download); `bq_download.py` pulls the result tables, then
`./dcso_bloom_build.py depsdev.sha1.bloom sha1 *.sha1.hex` (and
likewise sha256).

## Format

DCSO bloom filter format (`github.com/DCSO/bloom`), the same format
CIRCL publishes hashlookup in: 48-byte little-endian u64 header
(version, n, p, k, m, N) followed by the bit array. Keys are hex
digest strings — **UPPERCASE for sha1, lowercase for sha256** (the
hashlookup convention). Any DCSO-compatible reader works.

Membership answers are probabilistic: p = 1e-4 false-positive rate,
no false negatives. Confirm anything important against the source.