man > EVP_MD-MD5-SHA1(7ssl)

EVP_MD-MD5-SHA1(7SSL)                          OpenSSL                         EVP_MD-MD5-SHA1(7SSL)

NAME
       EVP_MD-MD5-SHA1 - The MD5-SHA1 EVP_MD implementation

DESCRIPTION
       Support for computing MD5-SHA1 digests through the EVP_MD API.

       MD5-SHA1 is a rather special digest that's used with SSLv3.

   Identity
       This implementation is only available with the default provider, and is identified with the
       name "MD5-SHA1".

   Gettable Parameters
       This implementation supports the common gettable parameters described in EVP_MD-common(7).

   Settable Context Parameters
       This implementation supports the following OSSL_PARAM(3) entries, settable for an EVP_MD_CTX
       with EVP_MD_CTX_set_params(3):

       "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), provider-digest(7), OSSL_PROVIDER-default(7)

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>.

3.0.13                                       2026-07-29                        EVP_MD-MD5-SHA1(7SSL)