feat: add rsa

src/main.rs

@@ -6,6 +6,8 @@ use rust_util::util_clap::{Command, CommandError};
 
 mod fido;
 mod digest;
+#[allow(unused)] // pending use in pgpcardimport
+mod rsautil;
 mod pkiutil;
 mod pgpcardutil;
 mod cmd_u2fregister;