Function mbedtls_dhm_get_value 

pub unsafe extern "C" fn mbedtls_dhm_get_value(
    ctx: *const mbedtls_dhm_context,
    param: mbedtls_dhm_parameter,
    dest: *mut mbedtls_mpi,
) -> c_int

\brief This function copies a parameter of a DHM key.

\param ctx The DHM context to query. \param param The parameter to copy. \param dest The MPI object to copy the value into. It must be initialized.

\return \c 0 on success. \return #MBEDTLS_ERR_DHM_BAD_INPUT_DATA if \p param is invalid. \return An \c MBEDTLS_ERR_MPI_XXX error code if the copy fails.