1EVP_BLAKE2B512(3ossl)               OpenSSL              EVP_BLAKE2B512(3ossl)
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NAME

6       EVP_blake2b512, EVP_blake2s256 - BLAKE2 For EVP
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SYNOPSIS

9        #include <openssl/evp.h>
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11        const EVP_MD *EVP_blake2b512(void);
12        const EVP_MD *EVP_blake2s256(void);
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DESCRIPTION

15       BLAKE2 is an improved version of BLAKE, which was submitted to the NIST
16       SHA-3 algorithm competition. The BLAKE2s and BLAKE2b algorithms are
17       described in RFC 7693.
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19       EVP_blake2s256()
20           The BLAKE2s algorithm that produces a 256-bit output from a given
21           input.
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23       EVP_blake2b512()
24           The BLAKE2b algorithm that produces a 512-bit output from a given
25           input.
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NOTES

28       Developers should be aware of the negative performance implications of
29       calling these functions multiple times and should consider using
30       EVP_MD_fetch(3) instead.  See "Performance" in crypto(7) for further
31       information.
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33       While the BLAKE2b and BLAKE2s algorithms supports a variable length
34       digest, this implementation outputs a digest of a fixed length (the
35       maximum length supported), which is 512-bits for BLAKE2b and 256-bits
36       for BLAKE2s.
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RETURN VALUES

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

44       RFC 7693.
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SEE ALSO

47       evp(7), EVP_DigestInit(3)
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50       Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
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52       Licensed under the Apache License 2.0 (the "License").  You may not use
53       this file except in compliance with the License.  You can obtain a copy
54       in the file LICENSE in the source distribution or at
55       <https://www.openssl.org/source/license.html>.
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593.1.1                             2023-08-31             EVP_BLAKE2B512(3ossl)
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