Add Custom RNG: getrandom-wasm-bindgen

Author: josephlr

Cargo.toml

@@ -18,6 +18,7 @@ appveyor = { repository = "rust-random/getrandom" }
 members = [
     "custom/dummy",
     "custom/stdweb",
+    "custom/wasm-bindgen",
 ]
 
 [dependencies]

custom/wasm-bindgen/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "getrandom-wasm-bindgen"
+version = "0.1.0"
+edition = "2018"
+authors = ["The Rand Project Developers"]
+license = "MIT OR Apache-2.0"
+description = "Custom shim for using getrandom with wasm-bindgen"
+documentation = "https://docs.rs/getrandom-bindgen"
+repository = "https://github.com/rust-random/getrandom/tree/master/custom/bindgen"
+categories = ["wasm"]
+
+[lib]
+crate-type = ["dylib"]
+
+[dependencies]
+getrandom = { path = "../..", features = ["custom"] }
+wasm-bindgen = "0.2.29"

src/wasm32_bindgen.rs custom/wasm-bindgen/src/lib.rs

@@ -6,16 +6,16 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Implementation for WASM via wasm-bindgen
-extern crate std;
+//! `getrandom` implementation for WASM via wasm-bindgen
+#![cfg(all(target_arch = "wasm32", target_os = "unknown"))]
 
 use core::cell::RefCell;
 use core::mem;
 use std::thread_local;
 
 use wasm_bindgen::prelude::*;
 
-use crate::Error;
+use getrandom::{register_custom_getrandom, Error};
 
 #[derive(Clone, Debug)]
 enum RngSource {
@@ -29,7 +29,9 @@ thread_local!(
     static RNG_SOURCE: RefCell<Option<RngSource>> = RefCell::new(None);
 );
 
-pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+register_custom_getrandom!(getrandom_inner);
+
+fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
     assert_eq!(mem::size_of::<usize>(), 4);
 
     RNG_SOURCE.with(|f| {