diff --git a/src/cli.rs b/src/cli.rs
index b69bd44..ccfca12 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -9,18 +9,22 @@ use openssl::{
 };
 use serde_json::{from_reader, from_str};
 
-use crate::{bink1998, bink2002, confid, crypto::initialize_elliptic_curve};
+use crate::{
+    bink1998, bink2002, confid, crypto::initialize_elliptic_curve, key::P_KEY_CHARSET, PK_LENGTH,
+};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum Mode {
-    Bink1998,
-    Bink2002,
+    Bink1998Generate,
+    Bink2002Generate,
     ConfirmationId,
+    Bink1998Validate,
+    Bink2002Validate,
 }
 
 impl Default for Mode {
     fn default() -> Self {
-        Self::Bink1998
+        Self::Bink1998Generate
     }
 }
 
@@ -55,6 +59,10 @@ pub struct Options {
     #[arg(short = 'c', long = "channel", default_value = "640")]
     channel_id: u32,
 
+    /// Product key to validate signature
+    #[arg(short = 'V', long = "validate")]
+    key_to_check: Option<String>,
+
     #[clap(skip)]
     application_mode: Mode,
 }
@@ -165,8 +173,16 @@ impl Cli {
 
         let bink_id = u32::from_str_radix(&options.binkid, 16)?;
 
+        if options.key_to_check.is_some() {
+            options.application_mode = Mode::Bink1998Validate;
+        }
+
         if bink_id >= 0x40 {
-            options.application_mode = Mode::Bink2002;
+            if options.key_to_check.is_some() {
+                options.application_mode = Mode::Bink2002Validate;
+            } else {
+                options.application_mode = Mode::Bink2002Generate;
+            }
         }
 
         if options.channel_id > 999 {
@@ -187,13 +203,15 @@ impl Cli {
 
     pub fn run(&mut self) -> Result<()> {
         match self.options.application_mode {
-            Mode::Bink1998 => self.bink1998(),
-            Mode::Bink2002 => self.bink2002(),
+            Mode::Bink1998Generate => self.bink1998_generate(),
+            Mode::Bink2002Generate => self.bink2002_generate(),
             Mode::ConfirmationId => self.confirmation_id(),
+            Mode::Bink1998Validate => self.bink1998_validate(),
+            Mode::Bink2002Validate => self.bink2002_validate(),
         }
     }
 
-    fn bink1998(&mut self) -> Result<()> {
+    fn bink1998_generate(&mut self) -> Result<()> {
         let mut n_raw = self.options.channel_id * 1_000_000; // <- change
 
         let mut bn_rand = BigNum::new()?;
@@ -230,7 +248,7 @@ impl Cli {
         Ok(())
     }
 
-    fn bink2002(&mut self) -> Result<()> {
+    fn bink2002_generate(&mut self) -> Result<()> {
         let p_channel_id = self.options.channel_id;
 
         if self.options.verbose {
@@ -267,6 +285,34 @@ impl Cli {
         Ok(())
     }
 
+    fn bink1998_validate(&mut self) -> Result<()> {
+        let Ok(key) = Self::strip_key(self.options.key_to_check.as_ref().unwrap()) else {
+            return Err(anyhow!("Product key is in an incorrect format!"));
+        };
+
+        Self::print_key(&key);
+        if !bink1998::verify(&self.e_curve, &self.gen_point, &self.pub_point, &key)? {
+            return Err(anyhow!("Product key is invalid! Wrong BINK ID?"));
+        }
+
+        println!("Key validated successfully!");
+        Ok(())
+    }
+
+    fn bink2002_validate(&mut self) -> Result<()> {
+        let Ok(key) = Self::strip_key(self.options.key_to_check.as_ref().unwrap()) else {
+            return Err(anyhow!("Product key is in an incorrect format!"));
+        };
+
+        Self::print_key(&key);
+        if !bink2002::verify(&self.e_curve, &self.gen_point, &self.pub_point, &key)? {
+            return Err(anyhow!("Product key is invalid! Wrong BINK ID?"));
+        }
+
+        println!("Key validated successfully!");
+        Ok(())
+    }
+
     fn confirmation_id(&mut self) -> Result<()> {
         if let Some(instid) = &self.options.instid {
             let confirmation_id = confid::generate(instid)?;
@@ -276,7 +322,7 @@ impl Cli {
     }
 
     fn print_key(pk: &str) {
-        assert_eq!(pk.len(), 25);
+        assert!(pk.len() >= PK_LENGTH);
         println!(
             "{}",
             pk.chars()
@@ -290,4 +336,23 @@ impl Cli {
                 })
         );
     }
+
+    fn strip_key(in_key: &str) -> Result<String> {
+        let out_key: String = in_key
+            .chars()
+            .filter_map(|c| {
+                let c = c.to_ascii_uppercase();
+                if P_KEY_CHARSET.into_iter().any(|x| x == c) {
+                    Some(c)
+                } else {
+                    None
+                }
+            })
+            .collect();
+        if out_key.len() == PK_LENGTH {
+            Ok(out_key)
+        } else {
+            Err(anyhow!("Invalid key length"))
+        }
+    }
 }
diff --git a/src/key.rs b/src/key.rs
index 193acbc..8e0f678 100644
--- a/src/key.rs
+++ b/src/key.rs
@@ -2,17 +2,18 @@ use std::collections::VecDeque;
 
 use openssl::bn::BigNum;
 
-const P_CHARSET: [char; 24] = [
+use crate::PK_LENGTH;
+
+/// The allowed character set in a product key.
+pub const P_KEY_CHARSET: [char; 24] = [
     'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'M', 'P', 'Q', 'R', 'T', 'V', 'W', 'X', 'Y', '2', '3',
     '4', '6', '7', '8', '9',
 ];
 
-const PK_LENGTH: usize = 25;
-
 pub fn base24_decode(cd_key: &str) -> Vec<u8> {
     let p_decoded_key: Vec<u8> = cd_key
         .chars()
-        .filter_map(|c| P_CHARSET.iter().position(|&x| x == c).map(|i| i as u8))
+        .filter_map(|c| P_KEY_CHARSET.iter().position(|&x| x == c).map(|i| i as u8))
         .collect();
 
     let mut y = BigNum::from_u32(0).unwrap();
@@ -28,7 +29,7 @@ pub fn base24_decode(cd_key: &str) -> Vec<u8> {
 pub fn base24_encode(byte_seq: &[u8]) -> String {
     let mut z = BigNum::from_slice(byte_seq).unwrap();
     let mut out: VecDeque<char> = VecDeque::new();
-    (0..=24).for_each(|_| out.push_front(P_CHARSET[z.div_word(24).unwrap() as usize]));
+    (0..=24).for_each(|_| out.push_front(P_KEY_CHARSET[z.div_word(24).unwrap() as usize]));
     out.iter().collect()
 }
 
diff --git a/src/main.rs b/src/main.rs
index 73492d7..1a5ccb1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,6 +7,8 @@ mod confid;
 mod crypto;
 mod key;
 
+const PK_LENGTH: usize = 25;
+
 fn main() -> Result<()> {
     cli::Cli::new()?.run()
 }