github.com/insolar/x-crypto@v0.0.0-20191031140942-75fab8a325f6/rand/rand_js.go (about)

     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  
    17  // reader implements a pseudorandom generator
    18  // using JavaScript crypto.getRandomValues method.
    19  // See https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues.
    20  type reader struct{}
    21  
    22  func (r *reader) Read(b []byte) (int, error) {
    23  	a := js.TypedArrayOf(b)
    24  	jsCrypto.Call("getRandomValues", a)
    25  	a.Release()
    26  	return len(b), nil
    27  }