Add support for noise IX, XX, and IK handshakes.

Cargo.toml

@@ -38,6 +38,7 @@ tokio-io = "0.1"
 [target.'cfg(not(any(target_os = "emscripten", target_os = "unknown")))'.dependencies]
 libp2p-dns = { version = "0.2.0", path = "./transports/dns" }
 libp2p-mdns = { version = "0.2.0", path = "./misc/mdns" }
+libp2p-noise = { version = "0.1.0", path = "./protocols/noise" }
 libp2p-tcp = { version = "0.2.0", path = "./transports/tcp" }
 
 [target.'cfg(any(target_os = "emscripten", target_os = "unknown"))'.dependencies]
@@ -65,6 +66,7 @@ members = [
     "protocols/floodsub",
     "protocols/identify",
     "protocols/kad",
+    "protocols/noise",
     "protocols/observed",
     "protocols/ping",
     "protocols/plaintext",

protocols/noise/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "libp2p-noise"
+description = "Cryptographic handshake protocol using the noise framework."
+version = "0.1.0"
+authors = ["Parity Technologies <[email protected]>"]
+license = "MIT"
+repository = "https://github.com/libp2p/rust-libp2p"
+edition = "2018"
+
+[dependencies]
+curve25519-dalek = "1"
+futures = "0.1"
+lazy_static = "1.2"
+libp2p-core = { version = "0.2.0", path = "../../core" }
+log = "0.4"
+rand = "0.6"
+snow = { version = "0.5.0-alpha1", default-features = false, features = ["ring-resolver"] }
+tokio-io = "0.1"
+
+[dev-dependencies]
+env_logger = "0.6"
+libp2p-tcp = { version = "0.2.0", path = "../../transports/tcp" }
+quickcheck = "0.8"
+tokio = "0.1"

protocols/noise/src/error.rs

@@ -0,0 +1,69 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+use snow::SnowError;
+use std::{error::Error, fmt, io};
+
+/// libp2p_noise error type.
+#[derive(Debug)]
+pub enum NoiseError {
+    /// An I/O error has been encountered.
+    Io(io::Error),
+    /// An noise framework error has been encountered.
+    Noise(SnowError),
+    /// A public key is invalid.
+    InvalidKey,
+    #[doc(hidden)]
+    __Nonexhaustive
+}
+
+impl fmt::Display for NoiseError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            NoiseError::Io(e) => write!(f, "{}", e),
+            NoiseError::Noise(e) => write!(f, "{}", e),
+            NoiseError::InvalidKey => f.write_str("invalid public key"),
+            NoiseError::__Nonexhaustive => f.write_str("__Nonexhaustive")
+        }
+    }
+}
+
+impl Error for NoiseError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        match self {
+            NoiseError::Io(e) => Some(e),
+            NoiseError::Noise(_) => None, // TODO: `SnowError` should implement `Error`.
+            NoiseError::InvalidKey => None,
+            NoiseError::__Nonexhaustive => None
+        }
+    }
+}
+
+impl From<io::Error> for NoiseError {
+    fn from(e: io::Error) -> Self {
+        NoiseError::Io(e)
+    }
+}
+
+impl From<SnowError> for NoiseError {
+    fn from(e: SnowError) -> Self {
+        NoiseError::Noise(e)
+    }
+}