DSA_dup_DH.3ossl - Man Page

create a DH structure out of DSA structure


 #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);


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).


Be careful to avoid small subgroup attacks when using this.

See Also

DH_new(3), DSA_new(3), ERR_get_error(3)


This function was deprecated in OpenSSL 3.0.

Referenced By

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

2023-03-21 3.0.8 OpenSSL