BLAKE3, BLAKE2 & Keccak-256 Hash Generator

Computes the modern hash functions that the usual MD5/SHA list leaves out, over UTF-8 text, hex bytes or a file of up to 32 MB. BLAKE3 is offered in its three modes — plain hashing, keyed hashing with a 32-byte key (a fast MAC) and key derivation from a context string — with any output length up to 1,024 bytes, since it is an extendable-output function. BLAKE2b and BLAKE2s take the full RFC 7693 parameter set: a digest length, an optional key (up to 64 or 32 bytes), and the salt and personalization fields, which are zero-padded to 16 or 8 bytes as the specification requires. Keccak-256 and Keccak-512 use the original Keccak padding that Ethereum adopted before SHA-3 was standardised, so Keccak-256 of an empty input is c5d24601…5d85a470 — not the SHA3-256 value, which differs because FIPS 202 changed the padding byte. SHAKE128 and SHAKE256 are the standard SHA-3 extendable-output functions. Results are shown in hex and Base64. Every algorithm is implemented directly in the page and checked against the reference code — Python's hashlib for BLAKE2, the official BLAKE3 implementation's bindings, pycryptodome for Keccak and SHAKE — and against the RFC 7693 and BLAKE3 published vectors. Two cautions: BLAKE2 and BLAKE3 are fast by design, so on their own they are the wrong choice for storing passwords, where a slow function such as Argon2, scrypt or bcrypt belongs; and an Ethereum address is the last 20 bytes of the Keccak-256 of the public key, not of an address string, so hash the right bytes.