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>.

3.0.13                                             2025-02-05                                 EVP_SHA3_224(3SSL)