Overview
BLAKE3 hashes chunks independently and combines chaining values in a tree, supporting keyed hashing and extendable output.
ExtendedSource checked
BLAKE3
Computes a fast cryptographic hash using a tree structure that can run in parallel.
Quick Facts
Compact metadata for implementation and discovery.
- Category
- Cryptography
- Difficulty
- Advanced
- Family
- Cryptographic Hash
- Tier
- Extended
- Status
- Verified
- Review
- Source Checked
- Sources
- 1
- Formulas
- 1
- Relationships
- 4
- Code example
- Not ready
- Visualization
- Ready
Core Concepts
hash treecompression functionchunkingdomain separation
Quick facts
Complexity
Runtime and memory behavior at a glance.
Best
O(n)
Average
O(n)
Worst
O(n)
Space
O(log n) stack for tree state
When to Use
- Use when fast hashing or parallel file hashing is needed.
- Use when file integrity checks is a central requirement.
When Not to Use
- Avoid when a protocol specifically requires SHA-256 or another standardized hash.
- Avoid when a reviewed library or protocol already provides the needed security property.
What It Does
- Hashes chunks independently
- Combines chunk hashes in a tree
- Produces fixed or extendable output
Use Cases
- File integrity checks
- Content addressing
- Fast keyed hashing
Inputs
- Message bytes
- Optional key or context
Outputs
- Hash digest
Key Formulas (1)
Tree merge
parent = compress(leftchaining value, rightchaining value, flags)
parent = compress(left_chaining_value, right_chaining_value, flags)Combines two child chaining values into their parent node.
Pseudocode
- 1.Split message into chunks
- 2.Compress each chunk into a chaining value
- 3.Merge chaining values in a binary tree
- 4.Finalize the root value into output bytes
Canonical Example
- Input
- message = "atlas"
- Output
- digest = BLAKE3(message)
- Explanation
- The message is compressed through chunk and tree nodes to produce a digest.
Implementation Notes
- Keep mode flags and domain separation explicit when reading the specification.
- Do not implement production cryptography from scratch; use the entry to understand the mechanism.
- Keep a tiny example with expected output beside the implementation.
Common Pitfalls
- Changing keyed, derive-key, and regular hashing modes changes the security meaning.
- Confusing hashing, encryption, signing, and key derivation can create insecure designs.
- Not defining boundary, empty, or degenerate inputs before implementation.
Interactive Mechanism Walkthrough
Graph Frontier & Edge RelaxationShow message chunks feeding a hash tree that collapses into one digest.
Step 1 of 4: Split message into chunks
crypto-flowNotes
Use library implementations; the entry explains the structure rather than production implementation details.
Sources (1)
What each reference supports for this entry.
BLAKE3 Specification
DocumentationOfficial specification and design rationale for the BLAKE3 cryptographic hash function.
Open sourceExplore Next
Good next jumps from the relationship graph, ranked for useful discovery.
Relationships
View full relationship pageUsesMerkle Tree
BLAKE3 uses a tree hashing mode for parallelism.
Alternative toSHA-256
BLAKE3 is a modern cryptographic hash alternative to SHA-256.
Tags
CryptographyHashingHash FunctionSecurity