# phpman > info > EVP_MD-SHAKE

[EVP_MD-SHAKE(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-SHAKE/7SSL/markdown)                  OpenSSL                 [EVP_MD-SHAKE(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-SHAKE/7SSL/markdown)

NAME
       EVP_MD-SHAKE, EVP_MD-KECCAK-KMAC - The SHAKE / KECCAK family EVP_MD
       implementations

DESCRIPTION
       Support for computing SHAKE or KECCAK-KMAC digests through the EVP_MD
       API.

       KECCAK-KMAC is a special digest that's used by the KMAC EVP_MAC
       implementation (see [EVP_MAC-KMAC(7)](https://www.chedong.com/phpMan.php/man/EVPMAC-KMAC/7/markdown)).

   Identities
       This implementation is only available with the default provider, and
       includes the following varieties:

       KECCAK-KMAC-128
           Known names are "KECCAK-KMAC-128" and "KECCAK-KMAC128"

       KECCAK-KMAC-256
           Known names are "KECCAK-KMAC-256" and "KECCAK-KMAC256"

       SHAKE-128
           Known names are "SHAKE-128" and "SHAKE128"

       SHAKE-256
           Known names are "SHAKE-256" and "SHAKE256"

   Gettable Parameters
       This implementation supports the common gettable parameters described
       in [EVP_MD-common(7)](https://www.chedong.com/phpMan.php/man/EVPMD-common/7/markdown).

   Settable Context Parameters
       These implementations support the following [OSSL_PARAM(3)](https://www.chedong.com/phpMan.php/man/OSSLPARAM/3/markdown) entries,
       settable for an EVP_MD_CTX with [EVP_MD_CTX_set_params(3)](https://www.chedong.com/phpMan.php/man/EVPMDCTXsetparams/3/markdown):

       "xoflen" (OSSL_DIGEST_PARAM_XOFLEN) <unsigned integer>
           Sets the digest length for extendable output functions.  The length
           of the "xoflen" parameter should not exceed that of a size_t.

SEE ALSO
       [EVP_MD_CTX_set_params(3)](https://www.chedong.com/phpMan.php/man/EVPMDCTXsetparams/3/markdown), [provider-digest(7)](https://www.chedong.com/phpMan.php/man/provider-digest/7/markdown), [OSSL_PROVIDER-default(7)](https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-default/7/markdown)

COPYRIGHT
       Copyright 2020 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>>.

3.0.2                             2026-04-07                [EVP_MD-SHAKE(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-SHAKE/7SSL/markdown)