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// 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" // The maximum buffer size for crypto.getRandomValues is 65536 bytes. // https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues#exceptions const maxGetRandomRead = 64 << 10 var batchedGetRandom func([]byte) error func init() { Reader = &reader{} batchedGetRandom = batched(getRandom, maxGetRandomRead) } 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) { if err := batchedGetRandom(b); err != nil { return 0, err } return len(b), nil } func getRandom(b []byte) error { a := uint8Array.New(len(b)) jsCrypto.Call("getRandomValues", a) js.CopyBytesToGo(b, a) return nil }
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