// Copyright 2010 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. // Windows cryptographically secure pseudorandom number // generator. package rand import ( "internal/syscall/windows" ) func init() { Reader = &rngReader{} } type rngReader struct{} func (r *rngReader) Read(b []byte) (n int, err error) { // RtlGenRandom only returns 1<<32-1 bytes at a time. We only read at // most 1<<31-1 bytes at a time so that this works the same on 32-bit // and 64-bit systems. if err := batched(windows.RtlGenRandom, 1<<31-1)(b); err != nil { return 0, err } return len(b), nil }