NAME

       EVP_sha3_224, EVP_sha3_256, EVP_sha3_384, EVP_sha3_512, EVP_shake128, EVP_shake256 - SHA-3
       For EVP

SYNOPSIS

        #include <openssl/evp.h>

        const EVP_MD *EVP_sha3_224(void);
        const EVP_MD *EVP_sha3_256(void);
        const EVP_MD *EVP_sha3_384(void);
        const EVP_MD *EVP_sha3_512(void);

        const EVP_MD *EVP_shake128(void);
        const EVP_MD *EVP_shake256(void);

DESCRIPTION

       SHA-3 (Secure Hash Algorithm 3) is a family of cryptographic hash functions standardized
       in NIST FIPS 202, first published in 2015. It is based on the Keccak algorithm.

       EVP_sha3_224(), EVP_sha3_256(), EVP_sha3_384(), EVP_sha3_512()
           The SHA-3 SHA-3-224, SHA-3-256, SHA-3-384, and SHA-3-512 algorithms respectively. They
           produce 224, 256, 384 and 512 bits of output from a given input.

       EVP_shake128(), EVP_shake256()
           The SHAKE-128 and SHAKE-256 Extendable Output Functions (XOF) that can generate a
           variable hash length.

           Specifically, EVP_shake128 provides an overall security of 128 bits, while
           EVP_shake256 provides that of 256 bits.

NOTES

       Developers should be aware of the negative performance implications of calling these
       functions multiple times and should consider using EVP_MD_fetch(3) with EVP_MD-SHA3(7) or
       EVP_MD-SHAKE(7) instead.  See "Performance" in crypto(7) for further information.

RETURN VALUES

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

CONFORMING TO

       NIST FIPS 202.

SEE ALSO

       evp(7), EVP_DigestInit(3)

COPYRIGHT

       Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except
       in compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.