OSSL_PROVIDER-legacy - OpenSSL legacy provider
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.
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.
The OpenSSL legacy provider supports these operations and algorithms:
  - 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)
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)
OSSL_PARAM(3), openssl-core.h(7),
  openssl-core_dispatch.h(7), provider(7)
This functionality was added in OpenSSL 3.0.
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>.