added check that inputs are on curve

src/lib.rs

@@ -416,6 +416,9 @@ impl PrivateKey {
     }
 
     pub fn decrypt_elgamal(&self, encrypted_point: ElGamalEncryption) -> Point {
+        // Make sure inputs aren't bad (i imagine this check could be skipped for performance reasons, but it seems a sanity check here would be helpful)
+        assert!(encrypted_point.c1.on_curve() && encrypted_point.c2.on_curve());
+
         let shared_secret = encrypted_point.c1.mul_scalar(&self.scalar_key());
         println!("Shared Secret {:?}", shared_secret);
         // Subtract the shared secret