Updated: 2022/Sep/29

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DSA_dup_DH(3)                       OpenSSL                      DSA_dup_DH(3)



NAME
       DSA_dup_DH - create a DH structure out of DSA structure

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/dsa.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
       version value, see openssl_user_macros(7):

        DH *DSA_dup_DH(const DSA *r);

DESCRIPTION
       The function described on this page is deprecated. There is no direct
       replacement, applications should use the EVP_PKEY APIs for Diffie-
       Hellman operations.

       DSA_dup_DH() duplicates DSA parameters/keys as DH parameters/keys. q is
       lost during that conversion, but the resulting DH parameters contain
       its length.

RETURN VALUES
       DSA_dup_DH() returns the new DH structure, and NULL on error. The error
       codes can be obtained by ERR_get_error(3).

NOTE
       Be careful to avoid small subgroup attacks when using this.

SEE ALSO
       DH_new(3), DSA_new(3), ERR_get_error(3)

HISTORY
       This function was deprecated in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2021 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>.



3.0.12                            2023-05-07                     DSA_dup_DH(3)