32 lines
680 B
Go
32 lines
680 B
Go
// Copyright 2010 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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// Windows cryptographically secure pseudorandom number
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// generator.
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package rand
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import (
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"internal/syscall/windows"
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"os"
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)
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func init() { Reader = &rngReader{} }
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type rngReader struct{}
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func (r *rngReader) Read(b []byte) (n int, err error) {
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// RtlGenRandom only accepts 2**32-1 bytes at a time, so truncate.
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inputLen := uint32(len(b))
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if inputLen == 0 {
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return 0, nil
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}
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err = windows.RtlGenRandom(b)
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if err != nil {
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return 0, os.NewSyscallError("RtlGenRandom", err)
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}
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return int(inputLen), nil
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}
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