Remove unused fields

src/cli.rs

@@ -60,13 +60,11 @@ pub struct Options {
 
 pub struct Cli {
     options: Options,
-    keys: serde_json::Value,
     private_key: BigNum,
     gen_order: BigNum,
     gen_point: EcPoint,
     pub_point: EcPoint,
     e_curve: EcGroup,
-    product_key: Option<String>,
     count: u32,
 }
 
@@ -117,13 +115,11 @@ impl Cli {
 
         Ok(Self {
             options,
-            keys,
             private_key,
             gen_order,
             gen_point,
             pub_point,
             e_curve,
-            product_key: None,
             count: 0,
         })
     }