Add create keypair cli functionality

Cargo.toml

@@ -27,7 +27,7 @@ aes = "0.8.3"
 rayon = "1.5"
 structopt = "0.3"
 serde = { version = "1.0", features = ["derive"] }
-
+serde_json = "1.0"
 
 [[bench]]
 name = "benchmark_sha3"

src/lib.rs

@@ -2,6 +2,9 @@
 /// Elliptic curve backend
 use tiny_ed448_goldilocks::curve::{extended_edwards::ExtendedPoint, field::scalar::Scalar};
 
+/// Serializing data structures
+use serde::Serialize;
+
 /// Module for SHA-3 primitives
 pub mod sha3 {
 
@@ -53,7 +56,7 @@ pub struct Signature {
     pub z: Scalar,
 }
 
-#[derive(Debug, Clone)]
+#[derive(Serialize, Debug, Clone)]
 /// An object containing the fields necessary to represent an asymmetric keypair.
 pub struct KeyPair {
     /// String indicating the owner of the key, can be arbitrary

src/main.rs

@@ -1,4 +1,4 @@
-use capycrypt::{Hashable, Message, SecParam};
+use capycrypt::{Hashable, KeyPair, Message, SecParam};
 use structopt::StructOpt;
 
 #[derive(Debug, StructOpt)]
@@ -20,6 +20,24 @@ enum Command {
         )]
         bits: usize,
     },
+
+    #[structopt(name = "new_keypair")]
+    NewKeypair {
+        #[structopt(help = "Password")]
+        pw: String,
+
+        #[structopt(help = "Owner of the key pair")]
+        owner: String,
+
+        #[structopt(help = "Selected curve")]
+        _curve: String,
+
+        #[structopt(help = "Security length", short, long, default_value = "256")]
+        bits: usize,
+
+        #[structopt(help = "Output file name", short, long)]
+        output: String,
+    },
 }
 
 fn main() {
@@ -37,5 +55,19 @@ fn main() {
                 Err(_) => eprintln!("Error: Hash computation failed"),
             }
         }
+
+        Command::NewKeypair {
+            pw,
+            owner,
+            _curve,
+            bits,
+            output,
+        } => {
+            let sec_param = SecParam::from_int(bits).expect("Unsupported security parameter.");
+            let kp = KeyPair::new(pw.as_bytes(), owner, &sec_param)
+                .expect("Unable to generate the requested key pair");
+
+            let _ = kp.save_to_file(&output);
+        }
     }
 }

src/ops.rs

@@ -344,6 +344,12 @@ impl KeyPair {
             date_created: get_date_and_time_as_string(),
         })
     }
+
+    /// Documentation should be written
+    pub fn save_to_file(&self, filename: &str) -> std::io::Result<()> {
+        let json_key_pair = serde_json::to_string_pretty(self).unwrap();
+        std::fs::write(filename, json_key_pair)
+    }
 }
 
 impl KeyEncryptable for Message {