cryptographic signature, put registration and messages structure

client-network/src/cryptographic_signature.rs

@@ -0,0 +1,55 @@
+use p256::ecdsa::{
+    Signature, SigningKey, VerifyingKey,
+    signature::{Signer, Verifier},
+};
+use rand_core::OsRng;
+
+///
+/// contains the ecdsa private key, the ecdsa public key and the username
+///
+pub struct CryptographicSignature {
+    priv_key: SigningKey,
+    pub pub_key: VerifyingKey,
+    pub username: String,
+}
+
+impl CryptographicSignature {
+    ///
+    /// creates a CryptographicSignature
+    ///
+    pub fn new(username: String) -> CryptographicSignature {
+        // generate a private key
+        let priv_key = SigningKey::random(&mut OsRng);
+        // extract the public key from the private key
+        let pub_key = VerifyingKey::from(&priv_key);
+        // return the new struct
+        CryptographicSignature {
+            priv_key: priv_key,
+            pub_key: pub_key,
+            username: username,
+        }
+    }
+}
+
+///
+/// returns a string representing the pub_key as a String
+///
+pub fn formatPubKey(crypto_pair: CryptographicSignature) -> String  {
+    let encoded_point = crypto_pair.pub_key.to_encoded_point(false);
+    let pubkey_bytes = encoded_point.as_bytes();
+    hex::encode(pubkey_bytes)
+}
+
+#[cfg(test)]
+mod tests {
+    // Note this useful idiom: importing names from outer (for mod tests) scope.
+    use super::*;
+
+    #[test]
+    fn creating_cryptographic_signature() {
+        let username = String::from("quoicoubeh");
+        let crypto_pair = CryptographicSignature::new(username);
+        let formatted_pubkey =formatPubKey(crypto_pair);
+        println!("pubkey : {}",formatted_pubkey);
+    }
+}