| // 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 |
| // +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 |
| } |