# EVP_MD-NULL - man(7) - [phpMan]

[_EVP_MD-NULL_(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-NULL/7SSL/markdown)                              OpenSSL                             [_EVP_MD-NULL_(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-NULL/7SSL/markdown)

## NAME
       EVP_MD-NULL - The NULL EVP_MD implementation

## DESCRIPTION
       Support for a NULL digest through the **EVP_MD **API.  This algorithm does nothing and returns 1
       for its init, update and final methods.

### Algorithm Name
       The following algorithm is available in the default provider:

       "NULL"

### Gettable Parameters
       This implementation supports the common gettable parameters described in [**EVP_MD-common**(7)](https://www.chedong.com/phpMan.php/man/EVPMD-common/7/markdown).

## SEE ALSO
       [**EVP_MD_CTX_set_params**(3)](https://www.chedong.com/phpMan.php/man/EVPMDCTXsetparams/3/markdown), [**provider-digest**(7)](https://www.chedong.com/phpMan.php/man/provider-digest/7/markdown), [**OSSL_PROVIDER-default**(7)](https://www.chedong.com/phpMan.php/man/OSSLPROVIDER-default/7/markdown)

## COPYRIGHT
       Copyright 2023 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                            [_EVP_MD-NULL_(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-NULL/7SSL/markdown)