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>.