=over 4
-=item OSSL_EXCHANGE_PARAM_PAD (int type)
+=item OSSL_EXCHANGE_PARAM_PAD (uint type)
Sets the DH padding mode.
If B<OSSL_EXCHANGE_PARAM_PAD> is 1 then the shared secret is padded with zeroes
If B<OSSL_EXCHANGE_PARAM_PAD> is zero (the default) then no padding is
performed.
+=item OSSL_SIGNATURE_PARAM_DIGEST (UTF8 string type)
+
+Sets the name of the digest algorithm used for the input to the signature
+functions.
+
+=item OSSL_SIGNATURE_PARAM_DIGEST_SIZE (size_t type)
+
+Sets the output size of the digest algorithm used for the input to the signature
+functions.
+The internal algorithm that supports this parameter is DSA.
+
=back
The function EVP_PKEY_CTX_ctrl() sends a control operation to the context