1=pod 2 3=head1 NAME 4 5EVP_sha3_224, 6EVP_sha3_256, 7EVP_sha3_384, 8EVP_sha3_512, 9EVP_shake128, 10EVP_shake256 11- SHA-3 For EVP 12 13=head1 SYNOPSIS 14 15 #include <openssl/evp.h> 16 17 const EVP_MD *EVP_sha3_224(void); 18 const EVP_MD *EVP_sha3_256(void); 19 const EVP_MD *EVP_sha3_384(void); 20 const EVP_MD *EVP_sha3_512(void); 21 22 const EVP_MD *EVP_shake128(void); 23 const EVP_MD *EVP_shake256(void); 24 25=head1 DESCRIPTION 26 27SHA-3 (Secure Hash Algorithm 3) is a family of cryptographic hash functions 28standardized in NIST FIPS 202, first published in 2015. It is based on the 29Keccak algorithm. 30 31=over 4 32 33=item EVP_sha3_224(), 34EVP_sha3_256(), 35EVP_sha3_384(), 36EVP_sha3_512() 37 38The SHA-3 SHA-3-224, SHA-3-256, SHA-3-384, and SHA-3-512 algorithms 39respectively. They produce 224, 256, 384 and 512 bits of output from a given 40input. 41 42=item EVP_shake128(), 43EVP_shake256() 44 45The SHAKE-128 and SHAKE-256 Extendable Output Functions (XOF) that can generate 46a variable hash length. 47 48Specifically, B<EVP_shake128> provides an overall security of 128 bits, while 49B<EVP_shake256> provides that of 256 bits. 50 51=back 52 53=head1 NOTES 54 55Developers should be aware of the negative performance implications of 56calling these functions multiple times and should consider using 57L<EVP_MD_fetch(3)> with L<EVP_MD-SHA3(7)> or L<EVP_MD-SHAKE(7)> instead. 58See L<crypto(7)/Performance> for further information. 59 60=head1 RETURN VALUES 61 62These functions return a B<EVP_MD> structure that contains the 63implementation of the message digest. See L<EVP_MD_meth_new(3)> for 64details of the B<EVP_MD> structure. 65 66=head1 CONFORMING TO 67 68NIST FIPS 202. 69 70=head1 SEE ALSO 71 72L<evp(7)>, 73L<EVP_DigestInit(3)> 74 75=head1 COPYRIGHT 76 77Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved. 78 79Licensed under the Apache License 2.0 (the "License"). You may not use 80this file except in compliance with the License. You can obtain a copy 81in the file LICENSE in the source distribution or at 82L<https://www.openssl.org/source/license.html>. 83 84=cut 85 86