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BLAKE3 is a versatile function succeeding BLAKE2 and BLAKE which is capable for usage in producing hashes, key derivation, and message authentication. This is the BLAKE3 Message Authentication Code, it is an eXtendable Output Function (XOF) which can produce arbitrary length outputs. As a message authentication code, it takes a 32 byte secret key as a parameter.

This online tool allows you to use the BLAKE3 Message Authentication Code.