Added wasm support

Cargo.toml

@@ -18,7 +18,8 @@ maintenance = { status = "actively-developed" }
 
 [dependencies]
 p256 = {version = "0.9", features = ["zeroize", "ecdh", "arithmetic", "pem", "jwk"]}
-rand_core = {version = "0.6", features = ["getrandom"]}
+rand_core = {version = "0.6"}
+getrandom = {version = "0.2.3"}
 hkdf = "0.11.0"
 hmac = "0.11.0"
 aes-gcm-siv = {version = "0.10.0"}
@@ -44,3 +45,4 @@ opt-level = 3
 [features]
 default = ["sha2"]
 ring = ["ring-compat/digest"]
+wasm = ["getrandom/js"]

README.md

@@ -118,9 +118,12 @@ assert_eq!(im_ratchet, bob_ratchet)
 
 ## Features
 
-Currently the crate only supports one feature: ring. If feature is enabled the crate switches
+The crate supports a feature for better performance: ring. If feature is enabled the crate switches
 to ring-compat and uses ring as backend for Sha512 Hashing. May result in slightly better performance.
 
+### WASM
+
+For WASM support enable the feature `wasm`.
 
 TODO:
 - [x] Standard Double Ratchet