B3 is a pure Elixir implementation of BLAKE3, a modern cryptographic hash function.

As well as regular hash, B3 is a PRF, MAC, KDF, and XOF. That's a lot of acronyms!

B3 is a pure Elixir port of the BLAKE3 reference implementation. Zero dependencies will make compilation and deployments simple, but if its performance you're after, you may want to check out the blake3 package which uses Rustler to bind to the Rust BLAKE3 implementation.

The package can be installed by adding b3 to your list of dependencies in mix.exs.

def deps do
  [
    {:b3, "~> 0.1"}
  ]
end

The B3 module provides three functions for all your hashing and key derivation needs:

• B3.hash/2 - Returns a hash of the given message.
• B3.keyed_hash/3 - Returns a keyed hash of the given message. Key must be 32 bytes.
• B3.derive_key/3 - Derives a key from the given key material and context string.

All functions accept a keyword list of options:

• :length - length in bytes of the resulting digest (default 32)
• :encoding - optional encoding of the resulting digest (from :base16, :base64 or :hex)

B3.hash("test", encoding: :hex)
"4878ca0425c739fa427f7eda20fe845f6b2e46ba5fe2a14df5b1e32f50603215"

B3.keyed_hash("test", "testkeytestkeytestkeytestkeytest", encoding: :hex)
"8bacb5b968184e269491c5022ec75d6b599ecf210ee3bb3a5208c1376f919202"

B3.derive_key("test", "[Test app] 1 Oct 2022 - Test keys", encoding: :hex)
"79bb09c3d5f99890ef4a24316036dd7707e9c0e9d3315de168248e666639438d"

Eddy is open source and released under the Apache-2 License.

© Copyright 2023 lebrunel.