.NET GUID Generator

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Provides RFC 4122 (UUID) and RFC 9562 (UUIDREV) compliant GUID generators for .NET platform.

RFC 4122 UUID Standard

RFC 4122 defines the following five versions of UUID:

Version 1: The time-based version, contains a 60-bit timestamp and a 12-bit MAC address.
Version 2: DCE Security version, contains a 28-bit timestamp, a 12-bit MAC address and a 32-bit local ID.
Version 3: The name-based version, using MD5 hashing to compute the hash of the namespace and name.
Version 4: The randomly or pseudo-randomly generated version, equivalent to Guid.NewGuid() in .NET.
Version 5: The name-based version, using SHA-1 hashing to compute the hash of the namespace and name.

There is also a special Nil UUID whose bytes are all 0x00s, which is equivalent to Guid.Empty in .NET.

RFC 4122 UUID Standard

DCE Security UUID Standard

RFC 9562 UUID Standard

RFC 9562 defines the following three versions of UUID:

Version 6: The reordered time-based version, field-compatible with Version 1 except that the timestamp is reordered to big-endian order.
Version 7: The Unix Epoch time-based version, contains a 48-bit timestamp and a 74-bit random number, field-compatible with ULID.
Version 8: Reserved for custom UUID formats, fields except the variant and version are user-defined.

There is also a special Max UUID whose bytes are all 0xffs, which has no equivalent implementation in .NET (provided in this project).

RFC 9562 UUID Standard

GUID Generator Library Usage

The GUID Generator Library project is located at XstarS.GuidGenerators.

Get Generator Instance by Static Properties

using XNetEx.Guids;
using XNetEx.Guids.Generators;

// time-based GUID generation.
var guidV1 = GuidGenerator.Version1.NewGuid();
// 3944a871-aa14-11ed-8791-a9a9a46de54f

// name-based GUID generation.
var guidV5 = GuidGenerator.Version5.NewGuid(GuidNamespaces.Dns, "github.com");
// 6fca3dd2-d61d-58de-9363-1574b382ea68

// Unix time-based GUID generation.
var guidV7 = GuidGenerator.Version7.NewGuid();
// 018640c6-0dc9-7189-a644-31acdba4cabc

Get Generator Instance by the Factory Method

using XNetEx.Guids;
using XNetEx.Guids.Generators;

// generate time-based GUID generation.
var guidV1 = GuidGenerator.OfVersion(1).NewGuid();
// 3944a871-aa14-11ed-8791-a9a9a46de54f

// generate name-based GUID.
var guidV5 = GuidGenerator.OfVersion(5).NewGuid(GuidNamespaces.Dns, "github.com");
// 6fca3dd2-d61d-58de-9363-1574b382ea68

// generate Unix time-based GUID.
var guidV7 = GuidGenerator.OfVersion(7).NewGuid();
// 018640c6-0dc9-7189-a644-31acdba4cabc

GUID Generator State Storage

RFC 4122 Section 4.2.1

Optional support and requires configuration to enable:

using System;
using System.IO;
using XNetEx.Guids.Generators;

// listen state storage exceptions.
GuidGenerator.StateStorageException += (sender, e) =>
{
    if ((e.OperationType != FileAccess.Read) ||
        (e.Exception is not FileNotFoundException))
    {
        Console.Error.WriteLine(e.Exception);
    }
};
// set storage file path and load state.
var loadResult = GuidGenerator.SetStateStorageFile("state.bin");

Component-based GUID Building

using System;
using XNetEx.Guids;

// build time-based GUID.
var guidV6 = Guid.Empty
    .ReplaceVariant(GuidVariant.Rfc4122)
    .ReplaceVersion(GuidVersion.Version6)
    .ReplaceTimestamp(new DateTime(0x08BEFFD14FDBF810, DateTimeKind.Utc))
    .ReplaceClockSequence((short)0x00b4)
    .ReplaceNodeId(new byte[] { 0x00, 0xc0, 0x4f, 0xd4, 0x30, 0xc8 });
    // 1d19dad6-ba7b-6810-80b4-00c04fd430c8

// build Unix time-based GUID.
var guidV7 = Guid.NewGuid()
    .ReplaceVersion(GuidVersion.Version7)
    .ReplaceTimestamp(new DateTime(0x08D9F638A666EB00, DateTimeKind.Utc));
    // 017f22e2-79b0-774a-8e21-a60c1ca56e82

F# GUID Module Usage

The F# GUID Module project is located at XstarS.GuidModule.

Core module: XNetEx.FSharp.Core.Guid.

Provides RFC 4122 (UUID) and RFC 9562 (UUIDREV) compliant GUID operations for F#. The orders of input parameters are adjusted to match F# pipeline patterns.

RFC-compliant GUID Generation

open System
open XNetEx.FSharp.Core

// load generator state from file.
let loadResult = Guid.loadState "state.bin"

// generate time-based GUID.
let guidV1 = Guid.newV1 () // 3944a871-aa14-11ed-8791-a9a9a46de54f
// generate randomized GUID.
let guidV4 = Guid.newV4 () // 0658f02d-45a4-4c25-b9d0-8ddbda3c3e08
// generate Unix time-based GUID.
let guidV7 = Guid.newV7 () // 018640c6-0dc9-7189-a644-31acdba4cabc

// generate name-based GUID.
let guidV3 = Guid.newV3S Guid.nsDns "github.com"
// 7f4771a0-1982-373d-928f-d31140a51652
let guidV5 = "github.com" |> Guid.newV5S Guid.nsDns
// 6fca3dd2-d61d-58de-9363-1574b382ea68

// build time-based GUID.
let guid6 = Guid.empty
            |> Guid.replaceVariant Guid.Variant.Rfc4122
            |> Guid.replaceVersion Guid.Version.Version6
            |> Guid.replaceTime DateTime.UtcNow
            |> Guid.replaceClockSeq 0x0123s
            |> Guid.replaceNodeId (Array.init 6 (((+) 1) >> byte))
            // 1edaa178-dec2-6054-8123-010203040506

// build Unix time-based GUID.
let guid7 = Guid.newV4 ()
            |> Guid.replaceVersion Guid.Version.Version7
            |> Guid.replaceTime DateTime.UtcNow
            // 018640db-de47-7ab9-bf00-6119a1033265

Common GUID Operations

open XNetEx.FSharp.Core

// GUID parsing and formatting.
let guid1 = Guid.parse "6ba7b810-9dad-11d1-80b4-00c04fd430c8"
let guid2 = "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}"
            |> Guid.parseExact "B"
printfn "%s" (guid2 |> Guid.format "X")

// GUID construction and deconstruction.
let guid3 = Guid.ofFields
                0x00112233 0x4455s 0x6677s (0x88uy, 0x99uy)
                (0xAAuy, 0xBBuy, 0xCCuy, 0xDDuy, 0xEEuy, 0xFFuy)
let guid3Fields = guid3 |> Guid.toFields

let guid4 = Array.map byte
                [| 0x00; 0x11; 0x22; 0x33; 0x44; 0x55; 0x66; 0x77
                   0x88; 0x99; 0xAA; 0xBB; 0xCC; 0xDD; 0xEE; 0xFF |]
            |> Guid.ofBytesUuid
let guid4Bytes = Guid.toBytes guid4
assert (guid3 = guid4)

let guid5 = Array.map byte
                [| 0x33; 0x22; 0x11; 0x00; 0x55; 0x44; 0x77; 0x66
                   0x88; 0x99; 0xAA; 0xBB; 0xCC; 0xDD; 0xEE; 0xFF |]
            |> Guid.ofBytes
let guid5Bytes = Guid.toBytesUuid guid5
assert (guid3 = guid5)

GUID Generator Command Line Tool Usage

The GUID Generator Command Line Tool project is located at XstarS.GuidGen.CLI.

The following commands are executed after renaming the command line tool to GuidGen.exe.

Command Line Tool Help Message

> GuidGen -?
Generate RFC 4122/9562 compliant GUIDs.
Usage:  GuidGen[.exe] [-V1|-V4|-V1R] [-Cn]
        GuidGen[.exe] -V2 Domain [SiteID]
        GuidGen[.exe] -V3|-V5 :NS|GuidNS [Name]
        GuidGen[.exe] -V6|-V7|-V8|-V6P|-V6R [-Cn]
        GuidGen[.exe] -V8N Hash :NS|GuidNS [Name]
        GuidGen[.exe] -?|-H|-Help
Parameters:
    -V1     Generate time-based GUID.
    -V2     Generate DCE Security GUID.
    -V3     Generate name-based GUID by MD5 hashing.
    -V4     Generate pseudo-random GUID (default).
    -V5     Generate name-based GUID by SHA1 hashing.
    -V6     Generate reordered time-based GUID.
    -V7     Generate Unix Epoch time-based GUID.
    -V8     Generate custom GUID (example impl).
    -V1R    Generate time-based GUID (random node ID).
    -V6P    Generate reordered time-based GUID
            (IEEE 802 MAC address node ID).
    -V6R    Generate reordered time-based GUID
            (non-volatile random node ID).
    -V8N    Generate custom GUID (name-based).
    -Cn     Generate n GUIDs of the current version.
    Domain  Specify a DCE Security domain,
            which can be Person, Group or Org.
    SiteID  Specify a user-defined local ID
            for DCE Security domain Org (required).
    :NS     Specify a well-known GUID namespace,
            which can be :DNS, :URL, :OID or :X500.
    GuidNS  Specify a user-defined GUID namespace.
    Name    Specify the name to generate GUID,
            or empty to read from standard input.
    Hash    Specify a well-known hash algorithm,
            which can be SHA256, SHA384, SHA512,
                SHA3-256, SHA3-384, SHA3-512,
                SHAKE128 or SHAKE256.
    -?|-H|-Help
            Show the current help message.

Command Line Tool Usage Examples

> GuidGen
7603eaf0-9aa8-47e6-a90b-009f9e7bbdf4
> GuidGen -V4 -C3
b3cbe197-3cca-4cd3-bcde-af605e6cac90
d0bb2cf9-ba9a-4d10-bc58-cfc7b9bd304a
3b1dc563-7c2e-4827-a1de-63f2eacd6512
> GuidGen -V5 :DNS github.com
6fca3dd2-d61d-58de-9363-1574b382ea68
> echo github.com | GuidGen -V5 :DNS
6fca3dd2-d61d-58de-9363-1574b382ea68
> GuidGen -V5 00000000-0000-0000-0000-000000000000 ""
e129f27c-5103-5c5c-844b-cdf0a15e160d
> GuidGen -V7
018640c6-0dc9-7189-a644-31acdba4cabc

Performance Benchmark

BenchmarkDotNet v0.13.10, Windows 11 (10.0.22631.2861/23H2/2023Update/SunValley3)
AMD Ryzen 7 5800H with Radeon Graphics, 1 CPU, 16 logical and 8 physical cores
.NET SDK 8.0.100
  [Host]     : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2

Method	GuidCount	Mean	StdDev	Ratio	Allocated
`GuidNewGuid`	1	39.4991 ns	0.6056 ns	1.00	-
`EmptyGenerate`	1	0.9068 ns	0.0223 ns	0.02	-
`GuidV1Generate`	1	105.6470 ns	0.4313 ns	2.68	-
`GuidV2Generate`	1	100.1834 ns	0.0721 ns	2.53	-
`GuidV3Generate`	1	185.6253 ns	1.6967 ns	4.70	-
`GuidV4Generate`	1	40.4183 ns	0.4285 ns	1.02	-
`GuidV5Generate`	1	175.3653 ns	2.4101 ns	4.44	-
`GuidV6Generate`	1	110.8020 ns	0.0918 ns	2.80	-
`GuidV7Generate`	1	87.1959 ns	0.7277 ns	2.20	-
`GuidV8Generate`	1	74.7173 ns	0.5928 ns	1.89	-
`MaxValueGenerate`	1	0.8104 ns	0.0097 ns	0.02	-

`GuidNewGuid`	1000	37,335.7751 ns	399.4522 ns	1.000	-
`EmptyGenerate`	1000	232.4035 ns	1.6808 ns	0.006	-
`GuidV1Generate`	1000	105,798.8867 ns	683.9275 ns	2.834	2 B
`GuidV2Generate`	1000	106,502.6782 ns	966.0136 ns	2.853	3 B
`GuidV3Generate`	1000	179,090.1237 ns	993.3070 ns	4.797	-
`GuidV4Generate`	1000	37,113.4318 ns	231.3545 ns	0.994	-
`GuidV5Generate`	1000	174,083.2118 ns	1,143.8121 ns	4.665	-
`GuidV6Generate`	1000	112,414.4548 ns	220.5529 ns	3.011	-
`GuidV7Generate`	1000	87,046.6785 ns	537.9173 ns	2.332	-
`GuidV8Generate`	1000	69,643.5563 ns	793.0038 ns	1.866	-
`MaxValueGenerate`	1000	233.2742 ns	1.6917 ns	0.006	-

Name		Name	Last commit message	Last commit date
Latest commit History 764 Commits
BuildItems		BuildItems
SharedItems		SharedItems
XstarS.GuidGen.CLI		XstarS.GuidGen.CLI
XstarS.GuidGen.NativeLib		XstarS.GuidGen.NativeLib
XstarS.GuidGen.Service		XstarS.GuidGen.Service
XstarS.GuidGenLib.Benchmarks		XstarS.GuidGenLib.Benchmarks
XstarS.GuidGenLib.UnitTests		XstarS.GuidGenLib.UnitTests
XstarS.GuidGenerators		XstarS.GuidGenerators
XstarS.GuidModule.UnitTests		XstarS.GuidModule.UnitTests
XstarS.GuidModule		XstarS.GuidModule
.gitattributes		.gitattributes
.gitignore		.gitignore
GuidGenerator.sln		GuidGenerator.sln
GuidGenerator.snk		GuidGenerator.snk
LICENSE.txt		LICENSE.txt
README.md		README.md
README.zh-CN.md		README.zh-CN.md

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.NET GUID Generator

RFC 4122 UUID Standard

RFC 9562 UUID Standard

GUID Generator Library Usage

Get Generator Instance by Static Properties

Get Generator Instance by the Factory Method

GUID Generator State Storage

Component-based GUID Building

F# GUID Module Usage

RFC-compliant GUID Generation

Common GUID Operations

GUID Generator Command Line Tool Usage

Command Line Tool Help Message

Command Line Tool Usage Examples

Performance Benchmark

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.NET GUID Generator

RFC 4122 UUID Standard

RFC 9562 UUID Standard

GUID Generator Library Usage

Get Generator Instance by Static Properties

Get Generator Instance by the Factory Method

GUID Generator State Storage

Component-based GUID Building

F# GUID Module Usage

RFC-compliant GUID Generation

Common GUID Operations

GUID Generator Command Line Tool Usage

Command Line Tool Help Message

Command Line Tool Usage Examples

Performance Benchmark

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