{
    "mode": "man",
    "parameter": "EVP_MAC-Siphash",
    "section": "7ssl",
    "url": "https://www.chedong.com/phpMan.php/man/EVP_MAC-Siphash/7ssl/json",
    "generated": "2026-10-04T13:35:05Z",
    "sections": {
        "NAME": {
            "content": "EVPMAC-Siphash - The Siphash EVPMAC implementation\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Support for computing Siphash MACs through the EVPMAC API.\n",
            "subsections": [
                {
                    "name": "Identity",
                    "content": "This implementation is identified with this name and properties, to be used with\nEVPMACfetch():\n\n\"SIPHASH\", \"provider=default\"\n"
                },
                {
                    "name": "Supported parameters",
                    "content": "The general description of these parameters can be found in \"PARAMETERS\" in EVPMAC(3).\n\nAll  these  parameters  can  be  set  with EVPMACCTXsetparams().  Furthermore, the \"size\"\nparameter can be retrieved with EVPMACCTXgetparams(), or with EVPMACCTXgetmacsize().\nThe length of the \"size\" parameter should not exceed that of a sizet.\n\n\"key\" (OSSLMACPARAMKEY) <octet string>\nSets  the  MAC  key.   Setting  this  parameter  is  identical  to  passing  a   key   to\nEVPMACinit(3).\n\n\"size\" (OSSLMACPARAMSIZE) <unsigned integer>\nSets the MAC size.\n\n\"c-rounds\" (OSSLMACPARAMCROUNDS) <unsigned integer>\nSpecifies the number of rounds per message block.  By default this is 2.\n\n\"d-rounds\" (OSSLMACPARAMDROUNDS) <unsigned integer>\nSpecifies the number of finalisation rounds.  By default this is 4.\n"
                }
            ]
        },
        "SEE ALSO": {
            "content": "EVPMACCTXgetparams(3),    EVPMACCTXsetparams(3),    \"PARAMETERS\"    in    EVPMAC(3),\nOSSLPARAM(3)\n",
            "subsections": []
        },
        "COPYRIGHT": {
            "content": "Copyright 2018-2021 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\n3.0.13                                       2026-07-29                        EVPMAC-SIPHASH(7SSL)",
            "subsections": []
        }
    },
    "summary": "EVPMAC-Siphash - The Siphash EVPMAC implementation",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "EVPMACCTXgetparams",
            "section": "3",
            "url": "https://www.chedong.com/phpMan.php/man/EVPMACCTXgetparams/3/json"
        },
        {
            "name": "EVPMACCTXsetparams",
            "section": "3",
            "url": "https://www.chedong.com/phpMan.php/man/EVPMACCTXsetparams/3/json"
        },
        {
            "name": "EVPMAC",
            "section": "3",
            "url": "https://www.chedong.com/phpMan.php/man/EVPMAC/3/json"
        },
        {
            "name": "OSSLPARAM",
            "section": "3",
            "url": "https://www.chedong.com/phpMan.php/man/OSSLPARAM/3/json"
        }
    ]
}