Source file src/pkg/crypto/rand/rand_js.go

     1	// Copyright 2018 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// +build js,wasm
     6	
     7	package rand
     8	
     9	import "syscall/js"
    10	
    11	func init() {
    12		Reader = &reader{}
    13	}
    14	
    15	var jsCrypto = js.Global().Get("crypto")
    16	var uint8Array = js.Global().Get("Uint8Array")
    17	
    18	// reader implements a pseudorandom generator
    19	// using JavaScript crypto.getRandomValues method.
    20	// See https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues.
    21	type reader struct{}
    22	
    23	func (r *reader) Read(b []byte) (int, error) {
    24		a := uint8Array.New(len(b))
    25		jsCrypto.Call("getRandomValues", a)
    26		js.CopyBytesToGo(b, a)
    27		return len(b), nil
    28	}
    29	

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