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// Copyright 2023 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 wasip1
package rand
import "syscall"
func init() {
Reader = &reader{}
}
type reader struct{}
func (r *reader) Read(b []byte) (int, error) {
// This uses the wasi_snapshot_preview1 random_get syscall defined in
// https://github.com/WebAssembly/WASI/blob/23a52736049f4327dd335434851d5dc40ab7cad1/legacy/preview1/docs.md#-random_getbuf-pointeru8-buf_len-size---result-errno.
// The definition does not explicitly guarantee that the entire buffer will
// be filled, but this appears to be the case in all runtimes tested.
err := syscall.RandomGet(b)
if err != nil {
return 0, err
}
return len(b), nil
}
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