diff --git a/src/cli.rs b/src/cli.rs
index 6c88f43..7b4b3fa 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -2,6 +2,11 @@ use std::{fs::File, io::BufReader, path::Path};
 
 use anyhow::{anyhow, Result};
 use clap::Parser;
+use openssl::{
+    bn::{BigNum, BigNumRef},
+    ec::{EcGroup, EcGroupRef, EcPoint, EcPointRef},
+    pkey::Private,
+};
 use serde_json::from_reader;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
@@ -104,3 +109,113 @@ pub fn validate_command_line(options: &mut Options) -> Result<serde_json::Value>
 
     Ok(keys)
 }
+
+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,
+}
+
+impl Cli {
+    pub fn new(options: Options, keys: serde_json::Value) -> Self {
+        let bink = &keys["BINK"][&options.binkid];
+        // We cannot produce a valid key without knowing the private key k. The reason for this is that
+        // we need the result of the function K(x; y) = kG(x; y).
+        let private_key = BigNum::from_dec_str(bink["n"].as_str().unwrap()).unwrap();
+
+        // We can, however, validate any given key using the available public key: {p, a, b, G, K}.
+        // genOrder the order of the generator G, a value we have to reverse -> Schoof's Algorithm.
+        let gen_order = BigNum::from_dec_str(bink["priv"].as_str().unwrap()).unwrap();
+
+        let p = bink["p"].as_str().unwrap();
+        let a = bink["a"].as_str().unwrap();
+        let b = bink["b"].as_str().unwrap();
+        let gx = bink["g"]["x"].as_str().unwrap();
+        let gy = bink["g"]["y"].as_str().unwrap();
+        let kx = bink["pub"]["x"].as_str().unwrap();
+        let ky = bink["pub"]["y"].as_str().unwrap();
+        let n = bink["n"].as_str().unwrap();
+        let k = bink["priv"].as_str().unwrap();
+
+        if options.verbose {
+            println!("-----------------------------------------------------------");
+            println!(
+                "Loaded the following elliptic curve parameters: BINK[{}]",
+                options.binkid
+            );
+            println!("-----------------------------------------------------------");
+            println!(" P: {p}");
+            println!(" a: {a}");
+            println!(" b: {b}");
+            println!("Gx: {gx}");
+            println!("Gy: {gy}");
+            println!("Kx: {kx}");
+            println!("Ky: {ky}");
+            println!(" n: {n}");
+            println!(" k: {k}");
+            println!();
+        }
+
+        let (e_curve, gen_point, pub_point) =
+            Cli::initialize_elliptic_curve(p, a, b, gx, gy, kx, ky);
+
+        Self {
+            options,
+            keys,
+            private_key,
+            gen_order,
+            gen_point,
+            pub_point,
+            e_curve,
+            product_key: None,
+            count: 0,
+        }
+    }
+
+    fn initialize_elliptic_curve(
+        p_sel: &str,
+        a_sel: &str,
+        b_sel: &str,
+        generator_x_sel: &str,
+        generator_y_sel: &str,
+        public_key_x_sel: &str,
+        public_key_y_sel: &str,
+    ) -> (EcGroup, EcPoint, EcPoint) {
+        let mut context = openssl::bn::BigNumContext::new().unwrap();
+
+        let p = BigNum::from_dec_str(p_sel).unwrap();
+        let a = BigNum::from_dec_str(a_sel).unwrap();
+        let b = BigNum::from_dec_str(b_sel).unwrap();
+        let generator_x = BigNum::from_dec_str(generator_x_sel).unwrap();
+        let generator_y = BigNum::from_dec_str(generator_y_sel).unwrap();
+
+        let public_key_x = BigNum::from_dec_str(public_key_x_sel).unwrap();
+        let public_key_y = BigNum::from_dec_str(public_key_y_sel).unwrap();
+
+        let c_curve = EcGroup::from_components(p, a, b, &mut context).unwrap();
+
+        let mut gen_point = EcPoint::new(&c_curve).unwrap();
+        let _ = gen_point.set_affine_coordinates_gfp(
+            &c_curve,
+            &generator_x,
+            &generator_y,
+            &mut context,
+        );
+
+        let mut pub_point = EcPoint::new(&c_curve).unwrap();
+        let _ = pub_point.set_affine_coordinates_gfp(
+            &c_curve,
+            &public_key_x,
+            &public_key_y,
+            &mut context,
+        );
+
+        (c_curve, gen_point, pub_point)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index d918138..e890108 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,7 +4,8 @@ mod cli;
 
 fn main() -> Result<()> {
     let mut args = cli::parse_command_line()?;
-    let _keys = cli::validate_command_line(&mut args);
+    let keys = cli::validate_command_line(&mut args)?;
+    let _cli = cli::Cli::new(args, keys);
     println!("Hello, world!");
     Ok(())
 }