Compute BLAKE2b hashes

Compute a modern BLAKE2b digest with optional length or keying.

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ToolBLAKE2b Hash
Input
Output
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How it works

BLAKE2b initializes a parameterized state, compresses 128-byte blocks, and truncates the final state to the selected digest length; an optional key creates a keyed integrity tag. The output is deterministic for the same bytes and parameters.

  • BLAKE2b supports up to 64-byte digests.
  • Keyed mode requires matching key and parameters.

Worked example

Hash Text
Generate a BLAKE2b-256 hash of a string
Input
											hello
Output
												324dcf027dd4a30a932c441f365a25e86b173defa4b8e58948253471b81b72cf

When to use this

Content-addressed stores, file fingerprints, and keyed integrity tags use BLAKE2b.

Edge cases

  • Changing digest length changes protocol output.
  • Keyed verification fails with a different key.
  • An unkeyed digest does not authenticate rewritten data.

References