8dc2499aa6
gotools/ * Makefile.am (go_cmd_cgo_files): Add ast_go118.go (check-go-tool): Copy golang.org/x/tools directories. * Makefile.in: Regenerate. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/384695
28 lines
702 B
Go
28 lines
702 B
Go
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build js && wasm
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package rand
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import "syscall/js"
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func init() {
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Reader = &reader{}
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}
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var jsCrypto = js.Global().Get("crypto")
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var uint8Array = js.Global().Get("Uint8Array")
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// reader implements a pseudorandom generator
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// using JavaScript crypto.getRandomValues method.
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// See https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues.
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type reader struct{}
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func (r *reader) Read(b []byte) (int, error) {
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a := uint8Array.New(len(b))
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jsCrypto.Call("getRandomValues", a)
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js.CopyBytesToGo(b, a)
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return len(b), nil
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}
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