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diff --git a/shared/comm-opaque2/Cargo.toml b/shared/comm-opaque2/Cargo.toml
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "comm-opaque"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+argon2 = "0.4"
+curve25519-dalek = "3.2"
+digest = "0.9"
+instrument = "0.2"
+log = "0.4"
+once_cell = "1.17"
+opaque-ke = { version = "2.0", features = [ "argon2" ] }
+rand = "0.8"
+sha2 = "0.9"
+tonic = { version = "0.8", default-features = false }
diff --git a/shared/comm-opaque2/src/client/login.rs b/shared/comm-opaque2/src/client/login.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/client/login.rs
@@ -0,0 +1,60 @@
+use opaque_ke::{
+  errors::ProtocolError, ClientLogin, ClientLoginFinishParameters,
+  CredentialResponse,
+};
+use rand::rngs::OsRng;
+
+use crate::Cipher;
+
+pub struct Login {
+  state: Option<ClientLogin<Cipher>>,
+  password: Option<String>,
+  rng: OsRng,
+  export_key: Option<Vec<u8>>,
+  pub session_key: Option<Vec<u8>>,
+}
+
+impl Login {
+  pub fn new() -> Login {
+    Login {
+      state: None,
+      password: None,
+      rng: OsRng,
+      session_key: None,
+      export_key: None,
+    }
+  }
+
+  pub fn start(&mut self, password: &str) -> Result<Vec<u8>, ProtocolError> {
+    let client_start_result =
+      ClientLogin::<Cipher>::start(&mut self.rng, password.as_bytes())?;
+    self.state = Some(client_start_result.state);
+    self.password = Some(password.to_string());
+    Ok(client_start_result.message.serialize().to_vec())
+  }
+
+  pub fn finish(
+    &mut self,
+    response_payload: &[u8],
+  ) -> Result<Vec<u8>, ProtocolError> {
+    let response = CredentialResponse::deserialize(response_payload)?;
+    let password = self
+      .password
+      .take()
+      .ok_or_else(|| ProtocolError::InvalidLoginError)?;
+    let state = self
+      .state
+      .take()
+      .ok_or_else(|| ProtocolError::InvalidLoginError)?;
+    let result = state.finish(
+      &password.as_bytes(),
+      response,
+      ClientLoginFinishParameters::default(),
+    )?;
+
+    self.session_key = Some(result.session_key.to_vec());
+    self.export_key = Some(result.export_key.to_vec());
+
+    Ok(result.message.serialize().to_vec())
+  }
+}
diff --git a/shared/comm-opaque2/src/client/mod.rs b/shared/comm-opaque2/src/client/mod.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/client/mod.rs
@@ -0,0 +1,5 @@
+pub mod login;
+pub mod register;
+
+pub use login::Login;
+pub use register::Registration;
diff --git a/shared/comm-opaque2/src/client/register.rs b/shared/comm-opaque2/src/client/register.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/client/register.rs
@@ -0,0 +1,52 @@
+use opaque_ke::{
+  errors::ProtocolError, ClientRegistration,
+  ClientRegistrationFinishParameters, RegistrationResponse,
+};
+use rand::rngs::OsRng;
+
+use crate::Cipher;
+
+pub struct Registration {
+  state: Option<ClientRegistration<Cipher>>,
+  rng: OsRng,
+  export_key: Option<Vec<u8>>,
+}
+
+impl Registration {
+  pub fn new() -> Registration {
+    Registration {
+      state: None,
+      rng: OsRng,
+      export_key: None,
+    }
+  }
+
+  pub fn start(&mut self, password: &str) -> Result<Vec<u8>, ProtocolError> {
+    let result =
+      ClientRegistration::<Cipher>::start(&mut self.rng, password.as_bytes())?;
+    self.state = Some(result.state);
+    Ok(result.message.serialize().to_vec())
+  }
+
+  pub fn finish(
+    &mut self,
+    password: &str,
+    response_payload: &[u8],
+  ) -> Result<Vec<u8>, ProtocolError> {
+    let response = RegistrationResponse::deserialize(response_payload)?;
+    let state = self
+      .state
+      .take()
+      .ok_or_else(|| ProtocolError::InvalidLoginError)?;
+    let result = state.finish(
+      &mut self.rng,
+      password.as_bytes(),
+      response,
+      ClientRegistrationFinishParameters::default(),
+    )?;
+
+    self.export_key = Some(result.export_key.to_vec());
+
+    Ok(result.message.serialize().to_vec())
+  }
+}
diff --git a/shared/comm-opaque2/src/grpc.rs b/shared/comm-opaque2/src/grpc.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/grpc.rs
@@ -0,0 +1,28 @@
+use log::info;
+use opaque_ke::errors::ProtocolError;
+use tonic::Status;
+
+fn protocol_error_to_grpc_status(error: ProtocolError) -> tonic::Status {
+  match error {
+    ProtocolError::IdentityGroupElementError => {
+      info!("Failed to validate password");
+      Status::aborted("server error")
+    }
+    ProtocolError::InvalidLoginError => {
+      info!("Failed to login");
+      Status::aborted("login failed")
+    }
+    ProtocolError::LibraryError(_) => {
+      info!("Opaque error");
+      Status::invalid_argument("internal error")
+    }
+    ProtocolError::ReflectedValueError => {
+      info!("OPRF value was reflected");
+      Status::invalid_argument("invalid server response")
+    }
+    ProtocolError::SerializationError => {
+      info!("Invalid argument");
+      Status::invalid_argument("invalid argument")
+    }
+  }
+}
diff --git a/shared/comm-opaque2/src/lib.rs b/shared/comm-opaque2/src/lib.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/lib.rs
@@ -0,0 +1,48 @@
+#![allow(dead_code)]
+
+mod client;
+mod grpc;
+mod opaque;
+mod server;
+
+pub use crate::opaque::Cipher;
+
+#[test]
+pub fn test_register_and_login() {
+  use rand::rngs::OsRng;
+
+  let pass = "test";
+  let username = "alice";
+
+  let server_setup = opaque_ke::ServerSetup::<Cipher>::new(&mut OsRng);
+
+  // Register user
+  let mut client_register = client::Registration::new();
+  let client_message = client_register.start(pass).unwrap();
+
+  let mut server_register = server::Registration::new();
+  let server_response = server_register
+    .start(&server_setup, &client_message, username.as_bytes())
+    .unwrap();
+
+  let client_upload = client_register.finish(pass, &server_response).unwrap();
+
+  // These bytes are the used to validate future login sessions, normally it
+  // would saved to a database or other data store
+  let password_file_bytes = server_register.finish(&client_upload).unwrap();
+
+  // Login user
+  let mut login_client = client::Login::new();
+  let client_request = login_client.start(pass).unwrap();
+
+  let mut server_login = server::Login::new(server_setup);
+  let server_response = server_login
+    .start(&password_file_bytes, &client_request, username.as_bytes())
+    .unwrap();
+
+  let client_upload = login_client.finish(&server_response).unwrap();
+
+  server_login.finish(&client_upload).unwrap();
+
+  assert_eq!(login_client.session_key, server_login.session_key);
+}
diff --git a/shared/comm-opaque2/src/opaque.rs b/shared/comm-opaque2/src/opaque.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/opaque.rs
@@ -0,0 +1,11 @@
+use argon2::Argon2;
+use opaque_ke::ciphersuite::CipherSuite;
+
+pub struct Cipher;
+
+impl CipherSuite for Cipher {
+  type OprfCs = opaque_ke::Ristretto255;
+  type KeGroup = opaque_ke::Ristretto255;
+  type KeyExchange = opaque_ke::key_exchange::tripledh::TripleDh;
+  type Ksf = Argon2<'static>;
+}
diff --git a/shared/comm-opaque2/src/server/login.rs b/shared/comm-opaque2/src/server/login.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/server/login.rs
@@ -0,0 +1,64 @@
+use opaque_ke::{errors::ProtocolError, ServerRegistration};
+use opaque_ke::{
+  CredentialFinalization, CredentialRequest, ServerLogin,
+  ServerLoginStartParameters, ServerSetup,
+};
+use rand::rngs::OsRng;
+
+use crate::Cipher;
+
+pub struct Login {
+  state: Option<ServerLogin<Cipher>>,
+  rng: OsRng,
+  pub session_key: Option<Vec<u8>>,
+  server_setup: ServerSetup<Cipher>,
+}
+
+impl Login {
+  pub fn new(server_setup: ServerSetup<Cipher>) -> Login {
+    Login {
+      state: None,
+      rng: OsRng,
+      session_key: None,
+      server_setup,
+    }
+  }
+
+  pub fn start(
+    &mut self,
+    password_file_bytes: &[u8],
+    credential_request: &[u8],
+    credential_identifier: &[u8],
+  ) -> Result<Vec<u8>, ProtocolError> {
+    let password_file = ServerRegistration::deserialize(password_file_bytes)?;
+    let credential_request =
+      CredentialRequest::deserialize(credential_request)?;
+    let result = ServerLogin::start(
+      &mut OsRng,
+      &self.server_setup,
+      Some(password_file),
+      credential_request,
+      credential_identifier,
+      ServerLoginStartParameters::default(),
+    )?;
+    self.state = Some(result.state);
+
+    Ok(result.message.serialize().to_vec())
+  }
+
+  pub fn finish(
+    &mut self,
+    response_payload: &[u8],
+  ) -> Result<(), ProtocolError> {
+    let finalization_payload =
+      CredentialFinalization::deserialize(&response_payload[..])?;
+
+    let state = self
+      .state
+      .take()
+      .ok_or_else(|| ProtocolError::InvalidLoginError)?;
+    let result = state.finish(finalization_payload)?;
+    self.session_key = Some(result.session_key.to_vec());
+    Ok(())
+  }
+}
diff --git a/shared/comm-opaque2/src/server/mod.rs b/shared/comm-opaque2/src/server/mod.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/server/mod.rs
@@ -0,0 +1,5 @@
+pub mod login;
+pub mod register;
+
+pub use login::Login;
+pub use register::Registration;
diff --git a/shared/comm-opaque2/src/server/register.rs b/shared/comm-opaque2/src/server/register.rs
new file mode 100644
--- /dev/null
+++ b/shared/comm-opaque2/src/server/register.rs
@@ -0,0 +1,40 @@
+use opaque_ke::{errors::ProtocolError, ServerRegistration};
+use opaque_ke::{RegistrationRequest, RegistrationUpload, ServerSetup};
+
+use crate::Cipher;
+
+pub struct Registration {}
+
+impl Registration {
+  pub fn new() -> Registration {
+    Registration {}
+  }
+
+  pub fn start(
+    &self,
+    server_setup: &ServerSetup<Cipher>,
+    payload: &[u8],
+    credential_identifier: &[u8],
+  ) -> Result<Vec<u8>, ProtocolError> {
+    let upload = RegistrationRequest::deserialize(payload)?;
+    let result = ServerRegistration::<Cipher>::start(
+      &server_setup,
+      upload,
+      credential_identifier,
+    )?;
+    Ok(result.message.serialize().to_vec())
+  }
+
+  pub fn finish(
+    &mut self,
+    response_payload: &[u8],
+  ) -> Result<Vec<u8>, ProtocolError> {
+    let upload_payload =
+      RegistrationUpload::<Cipher>::deserialize(response_payload)?;
+    Ok(
+      ServerRegistration::finish(upload_payload)
+        .serialize()
+        .to_vec(),
+    )
+  }
+}