// Copyright 2018 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build js && wasm package rand import "syscall/js" func init() { Reader = &reader{} } var jsCrypto = js.Global().Get("crypto") var uint8Array = js.Global().Get("Uint8Array") // reader implements a pseudorandom generator // using JavaScript crypto.getRandomValues method. // See https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues. type reader struct{} func (r *reader) Read(b []byte) (int, error) { a := uint8Array.New(len(b)) jsCrypto.Call("getRandomValues", a) js.CopyBytesToGo(b, a) return len(b), nil }