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BLAKE (hash function)
BLAKE and BLAKE2 are cryptographic hash functions.
It is based on Dan Bernstein's ChaCha stream cipher, but a permuted copy of the input block, XORed with some round constants, is added before each ChaCha round.
Like SHA-2, there are two variants differing in the word size. ChaCha operates on a 4×4 array of words. BLAKE repeatedly combines an 8-word hash value with 16 message words, truncating the ChaCha result to obtain the next hash value. BLAKE-256 and BLAKE-224 use 32-bit words and those output digest size are 256 bits and 224 bits, while BLAKE-512 and BLAKE-384 use 64-bit words and those output digest size are 512 bits and 384 bits
==History==
BLAKE was submitted to the NIST hash function competition by Jean-Philippe Aumasson, Luca Henzen, Willi Meier, and Raphael C.-W. Phan. In 2008, there were 51 entries. BLAKE made it to the final round consisting of five candidate but lost to ''Keccak'' in 2012, which was selected for the SHA-3 algorithm.
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