| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | EVP_blake2b512,
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| 6 | EVP_blake2s256
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| 7 | - BLAKE2 For EVP
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| 8 |
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| 9 | =head1 SYNOPSIS
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| 10 |
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| 11 | #include <openssl/evp.h>
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| 12 |
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| 13 | const EVP_MD *EVP_blake2b512(void);
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| 14 | const EVP_MD *EVP_blake2s256(void);
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| 15 |
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| 16 | =head1 DESCRIPTION
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| 17 |
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| 18 | BLAKE2 is an improved version of BLAKE, which was submitted to the NIST SHA-3
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| 19 | algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in
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| 20 | RFC 7693.
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| 21 |
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| 22 | =over 4
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| 23 |
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| 24 | =item EVP_blake2s256()
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| 25 |
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| 26 | The BLAKE2s algorithm that produces a 256-bit output from a given input.
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| 27 |
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| 28 | =item EVP_blake2b512()
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| 29 |
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| 30 | The BLAKE2b algorithm that produces a 512-bit output from a given input.
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| 31 |
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| 32 | =back
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| 33 |
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| 34 | =head1 NOTES
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| 35 |
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| 36 | Developers should be aware of the negative performance implications of
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| 37 | calling these functions multiple times and should consider using
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| 38 | L<EVP_MD_fetch(3)> instead.
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| 39 | See L<crypto(7)/Performance> for further information.
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| 40 |
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| 41 | While the BLAKE2b and BLAKE2s algorithms supports a variable length digest,
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| 42 | this implementation outputs a digest of a fixed length (the maximum length
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| 43 | supported), which is 512-bits for BLAKE2b and 256-bits for BLAKE2s.
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| 44 |
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| 45 | =head1 RETURN VALUES
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| 46 |
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| 47 | These functions return a B<EVP_MD> structure that contains the
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| 48 | implementation of the message digest. See L<EVP_MD_meth_new(3)> for
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| 49 | details of the B<EVP_MD> structure.
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| 50 |
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| 51 | =head1 CONFORMING TO
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| 52 |
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| 53 | RFC 7693.
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| 54 |
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| 55 | =head1 SEE ALSO
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| 56 |
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| 57 | L<evp(7)>,
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| 58 | L<EVP_DigestInit(3)>
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| 59 |
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| 60 | =head1 COPYRIGHT
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| 61 |
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| 62 | Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
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| 63 |
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| 64 | Licensed under the Apache License 2.0 (the "License"). You may not use
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| 65 | this file except in compliance with the License. You can obtain a copy
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| 66 | in the file LICENSE in the source distribution or at
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| 67 | L<https://www.openssl.org/source/license.html>.
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| 68 |
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| 69 | =cut
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| 70 |
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