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Cargo.toml

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+[package]
+name = "signed_token"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+ed25519-dalek = { version = "2", features = ["rand_core"]}
+rand = "0.8"
+base64 = "0.22"

src/lib.rs

@@ -0,0 +1,87 @@
+use serde::{Deserialize, Serialize};
+use ed25519_dalek::{Signature, SigningKey, Signer, VerifyingKey};
+use rand::rngs::OsRng;
+use base64::{engine::general_purpose, Engine as _};
+
+#[derive(Clone, Deserialize, Debug, Serialize)]
+pub struct Token {
+    pub user_id: String,
+    pub scope: String
+}
+
+pub struct SignedToken {
+    pub token: Token,
+    pub issued_at: u64,
+    pub signature: String, // why not just store the bytes?
+}
+
+impl Token {
+    pub fn new(json: &str) -> Result<Token,serde_json::Error> {
+        serde_json::from_str(json)
+    }
+}
+
+
+pub fn sign(token: &Token, private_key: &SigningKey) -> SignedToken {
+    let issued_at = 1710000000; // example timestamp
+    let data = (&token, issued_at);
+    let bytes = serde_json::to_vec(&data).unwrap();
+    let signature = private_key.sign(&bytes);
+    SignedToken {
+        token: token.clone(),
+        issued_at,
+        // encode to base64, makes it better for passing tokens across ascii-based protocols (http)
+        signature: general_purpose::STANDARD.encode(signature.to_bytes()),
+    }
+}
+
+pub fn verify(signed_token: &SignedToken, public_key: &VerifyingKey) -> Result<(),String> {
+    let data = (&signed_token.token, signed_token.issued_at);
+    let bytes = serde_json::to_vec(&data).unwrap();
+
+    // let sig_bytes = signed_token.signature.as_bytes();
+    let sig_bytes = general_purpose::STANDARD
+        .decode(&signed_token.signature)
+        .map_err(|e| e.to_string())?;
+
+    let sig_array: [u8; 64] = sig_bytes
+        .try_into()
+        .map_err(|_| "invalid signature length".to_string())?;
+
+    let signature = Signature::from_bytes(&sig_array);
+    public_key.verify_strict(&bytes, &signature).map_err(|_| "signature does not match".to_string())?;
+    Ok(())
+}
+
+pub fn generate_key_pair() -> (VerifyingKey, SigningKey) {
+    let mut csprng = OsRng; // get randomness from OS
+    let signing_key = SigningKey::generate(&mut csprng);
+    let verifying_key = signing_key.verifying_key();
+    (verifying_key, signing_key)
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test1() {
+        assert_eq!(4, 4);
+
+         let json_string = r#"{
+          "user_id": "123",
+          "scope": "read"
+        }"#;   
+
+        let token_res = Token::new(json_string);
+        if let Ok(token) = token_res {
+            let (pub_key, priv_key) = generate_key_pair();
+            let signed_token = sign(&token, &priv_key);
+            let valid = verify(&signed_token, &pub_key); 
+            assert!(valid.is_ok());
+            return;
+        }
+        assert!(false, "failed JSON parsing");
+    }
+}