{
    "content": [
        {
            "type": "text",
            "text": "# EVP_MAC-Siphash(7ssl) (man)\n\n**Summary:** EVPMAC-Siphash - The Siphash EVPMAC implementation\n\n## See Also\n\n- EVPMACCTXgetparams(3)\n- EVPMACCTXsetparams(3)\n- EVPMAC(3)\n- OSSLPARAM(3)\n\n## Section Outline\n\n- **NAME** (2 lines)\n- **DESCRIPTION** (2 lines) — 2 subsections\n  - Identity (5 lines)\n  - Supported parameters (19 lines)\n- **SEE ALSO** (3 lines)\n- **COPYRIGHT** (9 lines)\n\n## Full Content\n\n### NAME\n\nEVPMAC-Siphash - The Siphash EVPMAC implementation\n\n### DESCRIPTION\n\nSupport for computing Siphash MACs through the EVPMAC API.\n\n#### Identity\n\nThis implementation is identified with this name and properties, to be used with\nEVPMACfetch():\n\n\"SIPHASH\", \"provider=default\"\n\n#### Supported parameters\n\nThe 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\n### SEE ALSO\n\nEVPMACCTXgetparams(3), EVPMACCTXsetparams(3), \"PARAMETERS\" in EVPMAC(3),\nOSSLPARAM(3)\n\n### COPYRIGHT\n\nCopyright 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\n\n\n3.0.2                                        2026-04-07                        EVPMAC-SIPHASH(7SSL)\n\n"
        }
    ],
    "structuredContent": {
        "command": "EVP_MAC-Siphash",
        "section": "7ssl",
        "mode": "man",
        "summary": "EVPMAC-Siphash - The Siphash EVPMAC implementation",
        "synopsis": null,
        "tldr_summary": null,
        "tldr_examples": [],
        "tldr_source": null,
        "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"
            }
        ],
        "section_outline": [
            {
                "name": "NAME",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "DESCRIPTION",
                "lines": 2,
                "subsections": [
                    {
                        "name": "Identity",
                        "lines": 5
                    },
                    {
                        "name": "Supported parameters",
                        "lines": 19
                    }
                ]
            },
            {
                "name": "SEE ALSO",
                "lines": 3,
                "subsections": []
            },
            {
                "name": "COPYRIGHT",
                "lines": 9,
                "subsections": []
            }
        ]
    }
}