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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace System
{
partial struct Guid
{
// This will create a new random guid based on the https://www.ietf.org/rfc/rfc4122.txt
public static unsafe Guid NewGuid()
{
Guid g;
Interop.GetRandomBytes((byte*)&g, sizeof(Guid));
const ushort VersionMask = 0xF000;
const ushort RandomGuidVersion = 0x4000;
const byte ClockSeqHiAndReservedMask = 0xC0;
const byte ClockSeqHiAndReservedValue = 0x80;
// Modify bits indicating the type of the GUID
unchecked
{
// time_hi_and_version
g._c = (short)((g._c & ~VersionMask) | RandomGuidVersion);
// clock_seq_hi_and_reserved
g._d = (byte)((g._d & ~ClockSeqHiAndReservedMask) | ClockSeqHiAndReservedValue);
}
return g;
}
}
}
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