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userauth-main/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "ooni"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+cmz = { version = "0.1.0", path = "../cmz" }
+curve25519-dalek = { version = "4", features = ["digest", "group", "rand_core", "serde"] }
+ff = "0.13.1"
+group = "0.13.0"
+rand = "0.8.5"
+serde = "1.0.219"
+serde_with = "3.12.0"
+bincode = "1"
+serde_bytes = "0.11.17"
+sha2 = "0.10.9"
+chrono = "0.4.41"
+time = "0.3.41"

userauth-main/src/lib.rs

@@ -0,0 +1,42 @@
+// We want Scalars to be lowercase letters, and Points and credentials
+// to be capital letters
+#![allow(non_snake_case)]
+
+use cmz::*;
+use curve25519_dalek::ristretto::RistrettoPoint as G;
+use group::Group;
+type Scalar = <G as Group>::Scalar;
+use registration::UserAuthCredential;
+use serde::{Deserialize, Serialize};
+use sha2::Sha512;
+pub mod registration;
+pub mod submit;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct OONIAuth {
+    /// The private key for the main User Auth credential
+    privkey: CMZPrivkey<G>,
+    pubkey: CMZPubkey<G>,
+}
+
+impl OONIAuth {
+    pub fn init() -> Self {
+        // Initialization
+        let mut rng = rand::thread_rng();
+        cmz_group_init(G::hash_from_bytes::<Sha512>(b"CMZ Generator A"));
+        // Create the private and public keys for each of the types of
+        // credential with 'true' to indicate uCMZ
+        let (privkey, pubkey) = UserAuthCredential::gen_keys(&mut rng, true);
+        Self { privkey, pubkey }
+    }
+
+    /// Get today's (real or simulated) date as u32
+    pub fn today(&self) -> u32 {
+        // We will not encounter negative Julian dates (~6700 years ago)
+        // or ones larger than 32 bits
+        (time::OffsetDateTime::now_utc().date())
+            .to_julian_day()
+            .try_into()
+            .unwrap()
+    }
+}

userauth-main/src/registration.rs

@@ -0,0 +1,105 @@
+/* A module for the protocol for the user to register with the OONI Authority (OA)
+ * to receive their initial User Auth Credential
+ * The credential will have attributes:
+ * - nym_id: selected jointly by the user and OA
+ * - age: set by the OA to the date at the time of issuance
+ * - measurement_count: All new accounts will begin with 0
+*/
+
+use super::OONIAuth;
+use super::{Scalar, G};
+use cmz::*;
+use group::Group;
+use rand::RngCore;
+use sha2::Sha512;
+
+CMZ! { UserAuthCredential:
+    nym_id,
+    age,
+    measurement_count
+}
+
+muCMZProtocol! {open_registration,
+    ,
+    UAC: UserAuthCredential { nym_id: J, age: S, measurement_count: I},
+}
+
+pub fn request(
+    pubkeys: CMZPubkey<G>,
+) -> Result<(open_registration::Request, open_registration::ClientState), CMZError> {
+    let mut rng = rand::thread_rng();
+    cmz_group_init(G::hash_from_bytes::<Sha512>(b"CMZ Generator A"));
+
+    let mut UAC = UserAuthCredential::using_pubkey(&pubkeys);
+    // nym_id is a random scalar that the user will keep secret but re-randomize at each request to
+    // the OA
+    // Generate random generic scalar
+    let const_nym = Scalar::random(&mut rng);
+    UAC.nym_id = Some(const_nym);
+
+    match open_registration::prepare(&mut rng, UAC) {
+        Ok(req_state) => Ok(req_state),
+        Err(_) => Err(CMZError::CliProofFailed),
+    }
+}
+
+impl OONIAuth {
+    pub fn open_registration(
+        &mut self,
+        req: open_registration::Request,
+    ) -> Result<open_registration::Reply, CMZError> {
+        let mut rng = rand::thread_rng();
+        let reqbytes = req.as_bytes();
+
+        let recvreq = open_registration::Request::try_from(&reqbytes[..]).unwrap();
+        match open_registration::handle(
+            &mut rng,
+            recvreq,
+            |UAC: &mut UserAuthCredential| {
+                UAC.set_privkey(&self.privkey);
+                UAC.measurement_count = Some(Scalar::ZERO);
+                UAC.age = Some(self.today().into());
+                Ok(())
+            },
+            |_UAC: &UserAuthCredential| Ok(()),
+        ) {
+            Ok((response, _UAC_issuer)) => Ok(response),
+            Err(_) => Err(CMZError::IssProofFailed),
+        }
+    }
+}
+
+pub fn handle_response(
+    state: open_registration::ClientState,
+    rep: open_registration::Reply,
+) -> Result<UserAuthCredential, CMZError> {
+    let replybytes = rep.as_bytes();
+    let recvreply = open_registration::Reply::try_from(&replybytes[..]).unwrap();
+    match state.finalize(recvreply) {
+        Ok(cred) => Ok(cred),
+        Err(_e) => Err(CMZError::IssProofFailed),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_registration() {
+        use curve25519_dalek::scalar::Scalar;
+        let rng = &mut rand::thread_rng();
+        cmz_group_init(G::hash_from_bytes::<Sha512>(b"CMZ Generator A"));
+        let (_server_keypair, client_pub) = UserAuthCredential::gen_keys(rng, true);
+
+        let mut client_uac = UserAuthCredential::using_pubkey(&client_pub);
+        client_uac.age = Some(Scalar::from(100u64));
+        client_uac.measurement_count = Some(Scalar::from(0u64));
+
+        // let server_uac = UserAuthCredential::using_privkey(privkey: &server_keypair.privkey);
+        // register::prepare(rng, iss_cred_UAC)
+    }
+
+    #[test]
+    fn test_submit() {}
+}

userauth-main/src/submit.rs

@@ -0,0 +1,13 @@
+use cmz::*;
+use group::Group;
+use rand::RngCore;
+
+use crate::registration::UserAuthCredential;
+
+muCMZProtocol!(submit,
+    Old: UserAuthCredential { nym_id: H, age: H, measurement_count: H},
+    New: UserAuthCredential { nym_id: H, age: H, measurement_count: H},
+    Old.nym_id = New.nym_id,
+    Old.age = New.age,
+    New.measurement_count = Old.measurement_count + Scalar::from(1u64),
+);