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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 (
"os"
"syscall"
)
func init() { Reader = &rngReader{} }
type rngReader struct{}
func (r *rngReader) Read(b []byte) (n int, err error) {
// RtlGenRandom only accepts 2**32-1 bytes at a time, so truncate.
inputLen := uint32(len(b))
if inputLen == 0 {
return 0, nil
}
err = syscall.RtlGenRandom(&b[0], inputLen)
if err != nil {
return 0, os.NewSyscallError("RtlGenRandom", err)
}
return int(inputLen), nil
}
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