# phpman > man > OSSL_PROVIDER-legacy(7)

[OSSL_PROVIDER-LEGACY(7SSL)](https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-LEGACY/7SSL/markdown)                     OpenSSL                    [OSSL_PROVIDER-LEGACY(7SSL)](https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-LEGACY/7SSL/markdown)



## 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)](https://www.chedong.com/phpMan.php/man/fetch/3/markdown) or
       **EVP**___**CIPHER**___**[fetch**(3)](https://www.chedong.com/phpMan.php/man/fetch/3/markdown), as well as with other functions that take a property query string, such
       as **EVP**___**PKEY**___**CTX**___**new**___**from**___**[name**(3)](https://www.chedong.com/phpMan.php/man/name/3/markdown).

       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)](https://www.chedong.com/phpMan.php/man/MD-MD2/7/markdown)
       MD4, see **EVP**___**[MD-MD4**(7)](https://www.chedong.com/phpMan.php/man/MD-MD4/7/markdown)
       MDC2, see **EVP**___**[MD-MDC2**(7)](https://www.chedong.com/phpMan.php/man/MD-MDC2/7/markdown)
       WHIRLPOOL, see **EVP**___**[MD-WHIRLPOOL**(7)](https://www.chedong.com/phpMan.php/man/MD-WHIRLPOOL/7/markdown)
       RIPEMD160, see **EVP**___**[MD-RIPEMD160**(7)](https://www.chedong.com/phpMan.php/man/MD-RIPEMD160/7/markdown)

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

       Blowfish, see **EVP**___**[CIPHER-BLOWFISH**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-BLOWFISH/7/markdown)
       CAST, see **EVP**___**[CIPHER-CAST**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-CAST/7/markdown)
       DES, see **EVP**___**[CIPHER-DES**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-DES/7/markdown)
           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)](https://www.chedong.com/phpMan.php/man/CIPHER-IDEA/7/markdown)
       RC2, see **EVP**___**[CIPHER-RC2**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-RC2/7/markdown)
       RC4, see **EVP**___**[CIPHER-RC4**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-RC4/7/markdown)
       RC5, see **EVP**___**[CIPHER-RC5**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-RC5/7/markdown)
           Disabled by default. Use _enable-rc5_ config option to enable.

       SEED, see **EVP**___**[CIPHER-SEED**(7)](https://www.chedong.com/phpMan.php/man/CIPHER-SEED/7/markdown)

### Key Derivation Function (KDF)
       PBKDF1

## SEE ALSO
       **OSSL**___**[PARAM**(3)](https://www.chedong.com/phpMan.php/man/PARAM/3/markdown), [**openssl-core.h**(7)](https://www.chedong.com/phpMan.php/man/openssl-core.h/7/markdown), **openssl-core**___**[dispatch.h**(7)](https://www.chedong.com/phpMan.php/man/dispatch.h/7/markdown), [**provider**(7)](https://www.chedong.com/phpMan.php/man/provider/7/markdown)

## 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>>.



3.0.2                                        2026-06-02                   [OSSL_PROVIDER-LEGACY(7SSL)](https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-LEGACY/7SSL/markdown)