EVP_blake2b512.3ssl man page

EVP_blake2b512, EVP_blake2s256 — BLAKE2 For EVP


 #include <openssl/evp.h>

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


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.


The BLAKE2s algorithm that produces a 256-bit output from a given input.


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 symmetric cipher. See EVP_MD_meth_new(3) for details of the EVP_MD structure.

Conforming to

RFC 7693.


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.

See Also

evp(7), EVP_DigestInit(3)

Referenced By


The man page EVP_blake2s256.3ssl(3) is an alias of EVP_blake2b512.3ssl(3).

2019-11-21 1.1.1d OpenSSL