{
    "mode": "man",
    "parameter": "EVP_CIPHER-NULL",
    "section": "7ssl",
    "url": "https://www.chedong.com/phpMan.php/man/EVP_CIPHER-NULL/7ssl/json",
    "generated": "2026-10-04T18:56:04Z",
    "sections": {
        "NAME": {
            "content": "EVPCIPHER-NULL - The NULL EVPCIPHER implementation\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Support for a NULL symmetric encryption using the EVPCIPHER API.  This is used when the TLS\ncipher suite is TLSNULLWITHNULLNULL.  This does no encryption (just copies the data) and\nhas a mac size of zero.\n",
            "subsections": [
                {
                    "name": "Algorithm Name",
                    "content": "The following algorithm is available in the default provider:\n\n\"NULL\"\n"
                },
                {
                    "name": "Parameters",
                    "content": "This implementation supports the following parameters:\n\nGettable EVPCIPHER parameters\n\nSee \"Gettable EVPCIPHER parameters\" in EVPEncryptInit(3)\n\nGettable EVPCIPHERCTX parameters\n\n\"keylen\" (OSSLCIPHERPARAMKEYLEN) <unsigned integer>\n\"ivlen\" (OSSLCIPHERPARAMIVLEN and <OSSLCIPHERPARAMAEADIVLEN) <unsigned integer>\n\"tls-mac\" (OSSLCIPHERPARAMTLSMAC) <octet ptr>\n\nSee \"PARAMETERS\" in EVPEncryptInit(3) for further information.\n\nSettable EVPCIPHERCTX parameters\n\n\"tls-mac-size\" (OSSLCIPHERPARAMTLSMACSIZE) <unsigned integer>\n\nSee \"PARAMETERS\" in EVPEncryptInit(3) for further information.\n"
                }
            ]
        },
        "CONFORMING TO": {
            "content": "RFC 5246 section-6.2.3.1\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "provider-cipher(7), OSSLPROVIDER-default(7)\n",
            "subsections": []
        },
        "COPYRIGHT": {
            "content": "Copyright 2023 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                        EVPCIPHER-NULL(7SSL)",
            "subsections": []
        }
    },
    "summary": "EVPCIPHER-NULL - The NULL EVPCIPHER implementation",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "provider-cipher",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/provider-cipher/7/json"
        },
        {
            "name": "OSSLPROVIDER-default",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-default/7/json"
        }
    ]
}