wasm-bindgen: Added support for Internet Explorer 11

Author: zer0x64

src/wasm32_bindgen.rs

@@ -64,9 +64,15 @@ fn getrandom_init() -> Result<RngSource, Error> {
         // `crypto.getRandomValues`, but if `crypto` isn't defined we assume
         // we're in an older web browser and the OS RNG isn't available.
 
-        let crypto = self_.crypto();
+        let mut crypto = self_.crypto();
         if crypto.is_undefined() {
-            return Err(BINDGEN_CRYPTO_UNDEF);
+            // If crypto is undefined, we can also check if msCrypto is defined, 
+            // in case it's Internet Explorer
+            crypto = self_.ms_crypto();
+            
+            if crypto.is_undefined() {
+                return Err(BINDGEN_CRYPTO_UNDEF);
+            }
         }
 
         // Test if `crypto.getRandomValues` is undefined as well
@@ -88,6 +94,11 @@ extern "C" {
     fn get_self() -> Result<Self_, JsValue>;
 
     type Self_;
+
+    // Internet Explorer 11
+    #[wasm_bindgen(method, getter, js_name="msCrypto", structural)]
+    fn ms_crypto(me: &Self_) -> JsValue;
+
     #[wasm_bindgen(method, getter, structural)]
     fn crypto(me: &Self_) -> JsValue;