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sha3-check

v1.0.0

Published

SHA-3, SHAKE and Ethereum Keccak-256 checksums from the command line. Verify downloads with npx sha3-check.

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

amranirichamranirich

Keywords

sha3sha-3sha3-256sha3-512keccakkeccak256shake256checksumhashclifips202ethereum

Readme

sha3-check

SHA-3, SHAKE and Ethereum Keccak-256 checksums from the command line, with built-in verification.

npx sha3-check file.zip                       # SHA3-256 of a file
npx sha3-check file.zip -a sha3-512           # pick the algorithm
npx sha3-check file.zip -e 3a985da74fe2...    # verify: exit 0 on match, 1 on mismatch
npx sha3-check -s "transfer(address,uint256)" -a keccak-256   # Ethereum selector: a9059cbb...
cat file | npx sha3-check - -a all            # every SHA-3 variant at once

Options

| Option | Meaning | |---|---| | -a, --algo | sha3-224, sha3-256 (default), sha3-384, sha3-512, shake128, shake256, keccak-256, all | | -l, --length | output bits for SHAKE (default 256) | | -e, --expect | expected hash; exit code 0 if it matches, 1 if not | | -s, --string | hash a UTF-8 string instead of a file | | --json | machine-readable output |

Files are streamed, so large downloads hash without loading into memory. SHA-3 and SHAKE come from Node's built-in crypto (OpenSSL); Keccak-256 from js-sha3 (MIT), bundled.

SHA3-256 or Keccak-256?

They are not the same. Ethereum uses the original Keccak padding (0x01); NIST SHA-3 (FIPS 202) uses 0x06, so the outputs differ completely. The empty-string hash tells you which one you have:

  • Keccak-256: c5d24601...
  • SHA3-256: a7ffc6f8...

More: SHA-3 vs Keccak-256.

Online

Prefer a browser? sha3.si has the same functions as a private, in-browser calculator, plus test vectors and code examples in nine languages.

License

MIT