NAME

EVP_blake2b512, EVP_blake2s256 - BLAKE2 For EVP

SYNOPSIS

 #include <openssl/evp.h>

 const EVP_MD *EVP_blake2b512(void);
 const EVP_MD *EVP_blake2s256(void);

DESCRIPTION

BLAKE2 is an improved version of BLAKE, which was submitted to the NIST SHA-3 algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in RFC 7693.

EVP_blake2s256(): The BLAKE2s algorithm that produces a 256-bit output from a given input.
EVP_blake2b512(): The BLAKE2b algorithm that produces a 512-bit output from a given input.

RETURN VALUES

These functions return a EVP_MD structure that contains the implementation of the message digest. See EVP_MD_meth_new(3) for details of the EVP_MD structure.

CONFORMING TO

RFC 7693.

NOTES

While the BLAKE2b and BLAKE2s algorithms supports a variable length digest, this implementation outputs a digest of a fixed length (the maximum length supported), which is 512-bits for BLAKE2b and 256-bits for BLAKE2s.

COPYRIGHT

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <https://www.openssl.org/source/license.html>.