https://github.com/bgrainger/nguid
.NET Library for creating GUIDs according to RFC 4122 and draft-ietf-uuidrev
https://github.com/bgrainger/nguid
csharp dotnet guid uuid
Last synced: over 1 year ago
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.NET Library for creating GUIDs according to RFC 4122 and draft-ietf-uuidrev
- Host: GitHub
- URL: https://github.com/bgrainger/nguid
- Owner: bgrainger
- License: mit
- Created: 2023-07-01T01:18:59.000Z (about 3 years ago)
- Default Branch: master
- Last Pushed: 2024-02-19T11:26:48.000Z (over 2 years ago)
- Last Synced: 2024-07-02T21:13:35.388Z (almost 2 years ago)
- Topics: csharp, dotnet, guid, uuid
- Language: C#
- Homepage:
- Size: 125 KB
- Stars: 7
- Watchers: 2
- Forks: 1
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# NGuid
[](https://github.com/bgrainger/NGuid/actions/workflows/ci.yaml)
[](https://www.nuget.org/packages/NGuid)
## About
NGuid provides efficient creation of name-based, time-based, and random GUIDs according to
[RFC 4122](https://www.rfc-editor.org/rfc/rfc4122)
and [RFC 9562](https://www.rfc-editor.org/rfc/rfc9562):
* Version 3 ‒ created from an MD5 hash of a name
* Version 5 ‒ created from a SHA1 hash of a name
* Version 6 ‒ a field-compatible version of UUIDv1, reordered for improved DB locality
* Version 7 ‒ a time-ordered value based on a Unix timestamp
* Version 8 ‒ an RFC-compatible format for experimental or vendor-specific use cases
## Usage
```csharp
// returns a "Version 5" UUID by default: {74738ff5-5367-5958-9aee-98fffdcd1876}
var guidv5 = GuidHelpers.CreateFromName(GuidHelpers.DnsNamespace, "www.example.org"u8);
// can also create "Version 3": {0012416f-9eec-3ed4-a8b0-3bceecde1cd9}
var guidv3 = GuidHelpers.CreateFromName(GuidHelpers.DnsNamespace, "www.example.org"u8, version: 3);
// converts {6ba7b810-9dad-11d1-80b4-00c04fd430c8} to {1d19dad6-ba7b-6810-80b4-00c04fd430c8}
var guidv6 = GuidHelpers.CreateVersion6FromVersion1(GuidHelpers.DnsNamespace);
// creates a v7 GUID using the current time and random data
var guidv7 = GuidHelpers.CreateVersion7();
// .NET 8 only: specify a TimeProvider to provide the timestamp
var guidv7WithTime = GuidHelpers.CreateVersion7(TimeProvider.System);
// creates a v8 GUID using the specified data
ReadOnlySpan bytes = GetBytesFromSomewhere();
var guidv8 = GuidHelpers.CreateVersion8(bytes);
// creates a name-based v8 GUID using the specified hash algorithm
var guidv8ForName = GuidHelpers.CreateVersion8FromName(HashAlgorithmName.SHA256,
GuidHelpers.DnsNamespace, "www.example.com"u8);
```
## License
[MIT](https://github.com/bgrainger/NGuid/blob/master/LICENSE)