{
    "mode": "man",
    "parameter": "OSSL_PROVIDER-LEGACY",
    "section": "7SSL",
    "url": "https://www.chedong.com/phpMan.php/man/OSSL_PROVIDER-LEGACY/7SSL/json",
    "generated": "2026-10-06T06:27:19Z",
    "sections": {
        "NAME": {
            "content": "OSSLPROVIDER-legacy - OpenSSL legacy provider\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "The OpenSSL legacy provider supplies OpenSSL implementations of algorithms that have been\ndeemed legacy.  Such algorithms have commonly fallen out of use, have been deemed insecure by\nthe cryptography community, or something similar.\n\nWe can consider this the retirement home of cryptographic algorithms.\n",
            "subsections": [
                {
                    "name": "Properties",
                    "content": "The implementations in this provider specifically has this property defined:\n\n\"provider=legacy\"\n\nIt  may be used in a property query string with fetching functions such as EVPMDfetch(3) or\nEVPCIPHERfetch(3), as well as with other functions that take a property query string,  such\nas EVPPKEYCTXnewfromname(3).\n\nIt  isn't  mandatory  to  query  for  any  of  these  properties,  except to make sure to get\nimplementations of this provider and none other.\n"
                }
            ]
        },
        "OPERATIONS AND ALGORITHMS": {
            "content": "The OpenSSL legacy provider supports these operations and algorithms:\n",
            "subsections": [
                {
                    "name": "Hashing Algorithms / Message Digests",
                    "content": "MD2, see EVPMD-MD2(7)\nMD4, see EVPMD-MD4(7)\nMDC2, see EVPMD-MDC2(7)\nWHIRLPOOL, see EVPMD-WHIRLPOOL(7)\nRIPEMD160, see EVPMD-RIPEMD160(7)\n"
                },
                {
                    "name": "Symmetric Ciphers",
                    "content": "Not all of these symmetric cipher algorithms are enabled by default.\n\nBlowfish, see EVPCIPHER-BLOWFISH(7)\nCAST, see EVPCIPHER-CAST(7)\nDES, see EVPCIPHER-DES(7)\nThe algorithm names are: DESECB,  DESCBC,  DESOFB,  DESCFB,  DESCFB1,  DESCFB8  and\nDESXCBC.\n\nIDEA, see EVPCIPHER-IDEA(7)\nRC2, see EVPCIPHER-RC2(7)\nRC4, see EVPCIPHER-RC4(7)\nRC5, see EVPCIPHER-RC5(7)\nDisabled by default. Use enable-rc5 config option to enable.\n\nSEED, see EVPCIPHER-SEED(7)\n"
                },
                {
                    "name": "Key Derivation Function (KDF)",
                    "content": "PBKDF1\n"
                }
            ]
        },
        "SEE ALSO": {
            "content": "OSSLPARAM(3), openssl-core.h(7), openssl-coredispatch.h(7), provider(7)\n",
            "subsections": []
        },
        "HISTORY": {
            "content": "This functionality was added in OpenSSL 3.0.\n",
            "subsections": []
        },
        "COPYRIGHT": {
            "content": "Copyright 2020-2021 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                   OSSLPROVIDER-LEGACY(7SSL)",
            "subsections": []
        }
    },
    "summary": "OSSLPROVIDER-legacy - OpenSSL legacy provider",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "OSSLPARAM",
            "section": "3",
            "url": "https://www.chedong.com/phpMan.php/man/OSSLPARAM/3/json"
        },
        {
            "name": "openssl-core.h",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/openssl-core.h/7/json"
        },
        {
            "name": "openssl-coredispatch.h",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/openssl-coredispatch.h/7/json"
        },
        {
            "name": "provider",
            "section": "7",
            "url": "https://www.chedong.com/phpMan.php/man/provider/7/json"
        }
    ]
}