gnutls_dh_get_pubkey - API function
int gnutls_dh_get_pubkey(gnutls_session_t session, gnutls_datum_t * raw_key);
This function will return the peer's public key used in the last Diffie-Hellman key exchange. This function should be used for both anonymous and ephemeral Diffie-Hellman. The output parameters must be freed with gnutls_free().
Note, that public key is exported as non-negative integer and may include a leading zero byte.
On success, GNUTLS_E_SUCCESS (0) is returned, otherwise an error code is returned.
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