Compute SHA-3 (Keccak) digests

Compute a fixed-length SHA-3 digest using the Keccak sponge.

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ToolSHA-3 Hash
Input
Output
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How it works

SHA-3 absorbs bytes into a sponge, applies the 24-round Keccak-f permutation, and squeezes a selected digest using domain padding. SHA3-224, -256, -384, and -512 differ in capacity and length.

  • SHA-3 provides a sponge-based alternative to SHA-2.
  • Digest length controls compatibility and security margin.

Worked example

SHA3-256 Hash
Generate a NIST SHA3-256 hash of text
Input
											hello
Output
												3338be694f50c5f338814986cdf0686453a888b84f424d792af4b9202398f392

When to use this

Protocols, NIST test vectors, and hash migrations compute SHA-3.

Edge cases

  • SHAKE output is not interchangeable with fixed SHA3 variants.
  • Changing digest length changes the domain and output.
  • Different text encodings absorb different bytes.

References