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// 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
}
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