# phpman > man > EVP_MD-SHA1(7)

[EVP_MD-SHA1(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-SHA1/7SSL/markdown)                              OpenSSL                             [EVP_MD-SHA1(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-SHA1/7SSL/markdown)



## NAME
       EVP_MD-SHA1 - The SHA1 EVP_MD implementation

## DESCRIPTION
       Support for computing SHA1 digests through the **EVP**___**MD** API.

### Identities
       This implementation is available with the FIPS provider as well as the default provider, and
       is identified with the names "SHA1" and "SHA-1".

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

### Settable Context Parameters
       This implementation supports the following **OSSL**___**[PARAM**(3)](https://www.chedong.com/phpMan.php/man/PARAM/3/markdown) entries, settable for an **EVP**___**MD**___**CTX**
       with **EVP**___**MD**___**CTX**___**set**___**[params**(3)](https://www.chedong.com/phpMan.php/man/params/3/markdown):

       "ssl3-ms" (**OSSL**___**DIGEST**___**PARAM**___**SSL3**___**MS**) <octet string>
           This parameter is set by libssl in order to calculate a signature hash for an SSLv3
           CertificateVerify message as per RFC6101.  It is only set after all handshake messages
           have already been digested via **OP**___**digest**___**update()** calls.  The parameter provides the
           master secret value to be added to the digest.  The digest implementation should
           calculate the complete digest as per RFC6101 section 5.6.8.  The next call after setting
           this parameter should be **OP**___**digest**___**final()**.

## SEE ALSO
       **EVP**___**MD**___**CTX**___**set**___**[params**(3)](https://www.chedong.com/phpMan.php/man/params/3/markdown), [**provider-digest**(7)](https://www.chedong.com/phpMan.php/man/provider-digest/7/markdown), **OSSL**___**[PROVIDER-FIPS**(7)](https://www.chedong.com/phpMan.php/man/PROVIDER-FIPS/7/markdown), **OSSL**___**[PROVIDER-default**(7)](https://www.chedong.com/phpMan.php/man/PROVIDER-default/7/markdown)

## COPYRIGHT
       Copyright 2020 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                            [EVP_MD-SHA1(7SSL)](https://www.chedong.com/phpMan.php/man/EVPMD-SHA1/7SSL/markdown)