| --- |
| 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. |
|
|
