# phpman > man > EVP_MD-KECCAK-KMAC(7)

[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/MAC-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/MD-common/7/markdown).

### Settable Context Parameters
       These implementations support the following **OSSL**___**[PARAM**(3)](https://www.chedong.com/phpMan.php/man/PARAM/3/markdown) entries, settable for an **EVP**___**MD**___**CTX**
       with **EVP**___**MD**___**CTX**___**set**___**[params**(3)](https://www.chedong.com/phpMan.php/man/params/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/params/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/PROVIDER-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)