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e798248c84
Clearly document that implicit fetching is slower when using providers, and explain prefetching. Added to crypto.pod and migration_guide.pod links to it. Add a link to EVP_default_properties_enable_fips() in crypto.pod. Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/20354)
71 lines
1.6 KiB
Plaintext
71 lines
1.6 KiB
Plaintext
=pod
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=head1 NAME
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EVP_blake2b512,
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EVP_blake2s256
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- BLAKE2 For EVP
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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const EVP_MD *EVP_blake2b512(void);
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const EVP_MD *EVP_blake2s256(void);
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=head1 DESCRIPTION
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BLAKE2 is an improved version of BLAKE, which was submitted to the NIST SHA-3
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algorithm competition. The BLAKE2s and BLAKE2b algorithms are described in
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RFC 7693.
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=over 4
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=item EVP_blake2s256()
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The BLAKE2s algorithm that produces a 256-bit output from a given input.
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=item EVP_blake2b512()
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The BLAKE2b algorithm that produces a 512-bit output from a given input.
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=back
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=head1 NOTES
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Developers should be aware of the negative performance implications of
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calling these functions multiple times and should consider using
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L<EVP_MD_fetch(3)> instead.
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See L<crypto(7)/Performance> for further information.
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While the BLAKE2b and BLAKE2s algorithms supports a variable length digest,
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this implementation outputs a digest of a fixed length (the maximum length
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supported), which is 512-bits for BLAKE2b and 256-bits for BLAKE2s.
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=head1 RETURN VALUES
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These functions return a B<EVP_MD> structure that contains the
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implementation of the message digest. See L<EVP_MD_meth_new(3)> for
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details of the B<EVP_MD> structure.
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=head1 CONFORMING TO
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RFC 7693.
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=head1 SEE ALSO
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L<evp(7)>,
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L<EVP_DigestInit(3)>
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=head1 COPYRIGHT
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Copyright 2017-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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