DSA_dup_DH.3ossl - Man Page

create a DH structure out of DSA structure

Synopsis

 #include <openssl/dsa.h>

Deprecated since OpenSSL 3.0, 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.

Referenced By

DSA_get0_pqg.3ossl(3), DSA_meth_new.3ossl(3).

2021-09-09 3.0.0 OpenSSL