# gurnec/HashCheck

HashCheck Shell Extension for Windows with added SHA2, SHA3, and multithreading; originally from code.kliu.org

Repository: https://github.com/gurnec/HashCheck
Canonical: https://ross.abutalabs.com/products/hashcheck
Language: C
License: NOASSERTION
License Family: other
Last push: 2021-12-30T10:57:21+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4289, "days_push": 1707, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2079, forks 222 (observed 2026-08-28T04:06:11.476480+00:00)

## What it is
HashCheck is a Windows Explorer shell extension that lets users verify and generate file checksums (MD5, SHA-1, SHA-2, SHA-3, and more) directly from file properties and the context menu. It is a maintained fork of the original HashCheck tool from code.kliu.org, adding SHA2/SHA3 support and multithreading.

## Use cases
- verify checksums of downloaded files from windows explorer
- generate md5 or sha256 hash of a file
- create and check sfv or md5sum files
- compare a file against a checksum list
- integrity-check large downloads before use

## When to choose
- you need checksum verification integrated into windows explorer
- you want a lightweight, free, native windows tool for file hashing
- you need to create or verify checksum files like .sfv or .md5

## When to avoid
- you need a cross-platform or command-line-only hashing solution
- you are not on windows vista or later
- you need hashing of directories with exotic formats not supported by the extension

## Facets
- artifact type: plugin
- maturity: maintenance
- function: security, cryptography, developer-tools
- domain: security, developer-tools, windows, files
- platform: windows
- tags: checksum, hashing, shell-extension, file-integrity, sha256, md5, sfv

## Member repositories
- gurnec/HashCheck (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:11.476480+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:56:04.160423+00:00, confidence not recorded.
  - readme: https://github.com/gurnec/HashCheck (fetched 2026-08-28T04:06:11.476480+00:00, sha 7ebf2c60c058)
- Data as of 2026-08-30T08:39:29.467469+00:00.