Changed curve and added bench

Cargo.toml

@@ -13,8 +13,8 @@ license = "MIT"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-x25519-dalek = "1.1.1"
-rand_core = "0.5"
+p256 = {version = "0.8.1", features = ["zeroize", "ecdh", "arithmetic", "pem"]}
+rand_core = {version = "0.6", features = ["getrandom"]}
 hkdf = "0.11.0"
 hmac = "0.11.0"
 aes-gcm-siv = {version = "0.10.0"}
@@ -25,6 +25,13 @@ serde_bytes = "0.11.5"
 bincode = "1.3.3"
 hashbrown = "0.11.2"
 
+[dev-dependencies]
+criterion = "0.3.4"
+
+[[bench]]
+name = "double_ratchet_bench"
+harness = false
+
 [profile.release]
 lto = true
 opt-level = 3