#[no_mangle]
pub extern "C" fn _pgpDigParamsUserID(
    dig: *const PgpDigParams
) -> *const c_char
Expand description

Returns the primary User ID, if any.

If dig is a signature, then this returns NULL.

If dig is a certificate or a subkey, then this returns the certificate’s primary User ID, if any.

This interface does not provide a way for the caller to recognize any embedded NUL characters.

The caller must not free the returned buffer.