{
    "mode": "man",
    "parameter": "EVP_MD-KECCAK-KMAC",
    "section": "7",
    "url": "https://www.chedong.com/phpMan.php/man/EVP_MD-KECCAK-KMAC/7/json",
    "generated": "2026-06-13T23:00:03Z",
    "sections": {
        "NAME": {
            "content": "EVPMD-SHAKE, EVPMD-KECCAK-KMAC - The SHAKE / KECCAK family EVPMD implementations\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Support for computing SHAKE or KECCAK-KMAC digests through the EVPMD API.\n\nKECCAK-KMAC is a special digest that's used by the KMAC EVPMAC implementation (see\nEVPMAC-KMAC(7)).\n",
            "subsections": [
                {
                    "name": "Identities",
                    "content": "This implementation is only available with the default provider, and includes the following\nvarieties:\n\nKECCAK-KMAC-128\nKnown names are \"KECCAK-KMAC-128\" and \"KECCAK-KMAC128\"\n\nKECCAK-KMAC-256\nKnown names are \"KECCAK-KMAC-256\" and \"KECCAK-KMAC256\"\n\nSHAKE-128\nKnown names are \"SHAKE-128\" and \"SHAKE128\"\n\nSHAKE-256\nKnown names are \"SHAKE-256\" and \"SHAKE256\"\n"
                },
                {
                    "name": "Gettable Parameters",
                    "content": "This implementation supports the common gettable parameters described in EVPMD-common(7).\n"
                },
                {
                    "name": "Settable Context Parameters",
                    "content": "These implementations support the following OSSLPARAM(3) entries, settable for an EVPMDCTX\nwith EVPMDCTXsetparams(3):\n\n\"xoflen\" (OSSLDIGESTPARAMXOFLEN) <unsigned integer>\nSets the digest length for extendable output functions.  The length of the \"xoflen\"\nparameter should not exceed that of a sizet.\n"
                }
            ]
        },
        "SEE ALSO": {
            "content": "EVPMDCTXsetparams(3), provider-digest(7), OSSLPROVIDER-default(7)\n",
            "subsections": []
        },
        "COPYRIGHT": {
            "content": "Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.\n\nLicensed under the Apache License 2.0 (the \"License\").  You may not use this file except in\ncompliance with the License.  You can obtain a copy in the file LICENSE in the source\ndistribution or at <https://www.openssl.org/source/license.html>.\n\n\n\n3.0.2                                        2026-06-02                           EVPMD-SHAKE(7SSL)",
            "subsections": []
        }
    },
    "summary": "EVPMD-SHAKE, EVPMD-KECCAK-KMAC - The SHAKE / KECCAK family EVPMD implementations",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "EVPMDCTXsetparams",
            "section": "3",
            "url": "https://www.chedong.com/phpMan.php/man/EVPMDCTXsetparams/3/json"
        },
        {
            "name": "provider-digest",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/provider-digest/7/json"
        },
        {
            "name": "OSSLPROVIDER-default",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-default/7/json"
        }
    ]
}