man > OSSL_PROVIDER-legacy(7ssl)

OSSL_PROVIDER-LEGACY(7SSL)                     OpenSSL                    OSSL_PROVIDER-LEGACY(7SSL)

NAME
       OSSL_PROVIDER-legacy - OpenSSL legacy provider

DESCRIPTION
       The OpenSSL legacy provider supplies OpenSSL implementations of algorithms that have been
       deemed legacy.  Such algorithms have commonly fallen out of use, have been deemed insecure by
       the cryptography community, or something similar.

       We can consider this the retirement home of cryptographic algorithms.

   Properties
       The implementations in this provider specifically has this property defined:

       "provider=legacy"

       It  may be used in a property query string with fetching functions such as EVP_MD_fetch(3) or
       EVP_CIPHER_fetch(3), as well as with other functions that take a property query string,  such
       as EVP_PKEY_CTX_new_from_name(3).

       It  isn't  mandatory  to  query  for  any  of  these  properties,  except to make sure to get
       implementations of this provider and none other.

OPERATIONS AND ALGORITHMS
       The OpenSSL legacy provider supports these operations and algorithms:

   Hashing Algorithms / Message Digests
       MD2, see EVP_MD-MD2(7)
       MD4, see EVP_MD-MD4(7)
       MDC2, see EVP_MD-MDC2(7)
       WHIRLPOOL, see EVP_MD-WHIRLPOOL(7)
       RIPEMD160, see EVP_MD-RIPEMD160(7)

   Symmetric Ciphers
       Not all of these symmetric cipher algorithms are enabled by default.

       Blowfish, see EVP_CIPHER-BLOWFISH(7)
       CAST, see EVP_CIPHER-CAST(7)
       DES, see EVP_CIPHER-DES(7)
           The algorithm names are: DES_ECB,  DES_CBC,  DES_OFB,  DES_CFB,  DES_CFB1,  DES_CFB8  and
           DESX_CBC.

       IDEA, see EVP_CIPHER-IDEA(7)
       RC2, see EVP_CIPHER-RC2(7)
       RC4, see EVP_CIPHER-RC4(7)
       RC5, see EVP_CIPHER-RC5(7)
           Disabled by default. Use enable-rc5 config option to enable.

       SEED, see EVP_CIPHER-SEED(7)

   Key Derivation Function (KDF)
       PBKDF1

SEE ALSO
       OSSL_PARAM(3), openssl-core.h(7), openssl-core_dispatch.h(7), provider(7)

HISTORY
       This functionality was added in OpenSSL 3.0.

COPYRIGHT
       Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed  under  the Apache License 2.0 (the "License").  You may not use this file except in
       compliance with the License.  You can obtain a  copy  in  the  file  LICENSE  in  the  source
       distribution or at <https://www.openssl.org/source/license.html>.

3.0.13                                       2026-07-29                   OSSL_PROVIDER-LEGACY(7SSL)