{
    "mode": "man",
    "parameter": "EVP_MAC-CMAC",
    "section": "7SSL",
    "url": "https://www.chedong.com/phpMan.php/man/EVP_MAC-CMAC/7SSL/json",
    "generated": "2026-08-10T02:27:48Z",
    "sections": {
        "NAME": {
            "content": "EVPMAC-CMAC - The CMAC EVPMAC implementation\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Support for computing CMAC MACs through the EVPMAC API.\n\nThis implementation uses EVPCIPHER functions to get access to the underlying cipher.\n",
            "subsections": [
                {
                    "name": "Identity",
                    "content": "This implementation is identified with this name and properties, to be used with\nEVPMACfetch():\n\n\"CMAC\", \"provider=default\" or \"provider=fips\"\n"
                },
                {
                    "name": "Supported parameters",
                    "content": "The general description of these parameters can be found in \"PARAMETERS\" in EVPMAC(3).\n\nThe following parameter can be set with EVPMACCTXsetparams():\n\n\"key\" (OSSLMACPARAMKEY) <octet string>\nSets   the   MAC  key.   Setting  this  parameter  is  identical  to  passing  a  key  to\nEVPMACinit(3).\n\n\"cipher\" (OSSLMACPARAMCIPHER) <UTF8 string>\nSets the name of the underlying cipher to be used.\n\n\"properties\" (OSSLMACPARAMPROPERTIES) <UTF8 string>\nSets the properties to be queried when trying to fetch the underlying cipher.  This  must\nbe given together with the cipher naming parameter to be considered valid.\n\nThe following parameters can be retrieved with EVPMACCTXgetparams():\n\n\"size\" (OSSLMACPARAMSIZE) <unsigned integer>\nThe  \"size\"  parameter  can  also be retrieved with with EVPMACCTXgetmacsize().  The\nlength of the \"size\" parameter is equal to that of an unsigned int.\n\n\"block-size\" (OSSLMACPARAMBLOCKSIZE) <unsigned integer>\nGets the MAC  block  size.   The  \"block-size\"  parameter  can  also  be  retrieved  with\nEVPMACCTXgetblocksize().\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-CMAC(7SSL)",
            "subsections": []
        }
    },
    "summary": "EVPMAC-CMAC - The CMAC 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"
        }
    ]
}