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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)
86 lines
1.9 KiB
Plaintext
86 lines
1.9 KiB
Plaintext
=pod
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=head1 NAME
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EVP_sha3_224,
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EVP_sha3_256,
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EVP_sha3_384,
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EVP_sha3_512,
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EVP_shake128,
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EVP_shake256
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- SHA-3 For EVP
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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const EVP_MD *EVP_sha3_224(void);
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const EVP_MD *EVP_sha3_256(void);
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const EVP_MD *EVP_sha3_384(void);
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const EVP_MD *EVP_sha3_512(void);
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const EVP_MD *EVP_shake128(void);
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const EVP_MD *EVP_shake256(void);
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=head1 DESCRIPTION
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SHA-3 (Secure Hash Algorithm 3) is a family of cryptographic hash functions
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standardized in NIST FIPS 202, first published in 2015. It is based on the
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Keccak algorithm.
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=over 4
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=item EVP_sha3_224(),
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EVP_sha3_256(),
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EVP_sha3_384(),
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EVP_sha3_512()
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The SHA-3 SHA-3-224, SHA-3-256, SHA-3-384, and SHA-3-512 algorithms
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respectively. They produce 224, 256, 384 and 512 bits of output from a given
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input.
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=item EVP_shake128(),
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EVP_shake256()
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The SHAKE-128 and SHAKE-256 Extendable Output Functions (XOF) that can generate
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a variable hash length.
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Specifically, B<EVP_shake128> provides an overall security of 128 bits, while
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B<EVP_shake256> provides that of 256 bits.
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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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=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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NIST FIPS 202.
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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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