First commit in rust

Cargo.toml

@@ -0,0 +1,42 @@
+[workspace]
+resolver = "2"
+members = [
+    "backchannel-common",
+    "backchannel-server",
+    "backchannel-client",
+]
+
+[workspace.dependencies]
+# Serialization
+serde       = { version = "1", features = ["derive"] }
+serde_json  = "1"
+
+# IDs / time
+uuid   = { version = "1", features = ["v4", "serde"] }
+chrono = { version = "0.4", features = ["serde"] }
+
+# Error handling
+thiserror = "1"
+anyhow    = "1"
+
+# Observability
+tracing            = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# Encoding
+base64 = "0.22"
+
+# Crypto
+rand             = "0.8"
+argon2           = "0.5"
+ed25519-dalek    = { version = "2", features = ["rand_core"] }
+x25519-dalek     = { version = "2", features = ["static_secrets"] }
+chacha20poly1305 = "0.10"
+hkdf             = "0.12"
+sha2             = "0.10"
+
+# Async runtime
+tokio = { version = "1", features = ["full"] }
+
+# WebSocket
+tokio-tungstenite = "0.21"