CyberDot.Encoding.Base91 1.0.0

.NET Standard 1.6 This package targets .NET Standard 1.6. The package is compatible with this framework or higher. 
dotnet add package CyberDot.Encoding.Base91 --version 1.0.0
                    


                    

                
NuGet\Install-Package CyberDot.Encoding.Base91 -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="CyberDot.Encoding.Base91" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="CyberDot.Encoding.Base91" Version="1.0.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="CyberDot.Encoding.Base91" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add CyberDot.Encoding.Base91 --version 1.0.0
                    


                    

                
#r "nuget: CyberDot.Encoding.Base91, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package CyberDot.Encoding.Base91@1.0.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=CyberDot.Encoding.Base91&version=1.0.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=CyberDot.Encoding.Base91&version=1.0.0
                    


                            Install as a Cake Tool

CyberDot.Encoding.Base91

An implementation of Base91 (basE91) encoding in C#.

Base91 is a binary-to-text encoding that uses 91 of the 94 printable ASCII characters - excluding space, apostrophe, hyphen and backslash. It packs input bits into a queue and drains a pair of characters at a time, each pair holding 13 or 14 bits, so encoded output is about 23% larger than the input, against 33% for Base64.

Unlike Base64/Base85-style encodings, Base91 has no fixed-width character group, so there is no canonical padding to validate on decode: bits left over from a final, unpaired character are simply dropped, exactly as the reference implementation does.

Usage

using CyberDot.Encoding.Base91;

var bytes = System.Text.Encoding.UTF8.GetBytes("hello world");
var encoded = Base91.Encode(bytes);

var decoded = Base91.Decode(encoded); // Output: hello world

Streaming

ToBase91Transform/FromBase91Transform implement ICryptoTransform, so they plug into CryptoStream for streaming encode/decode without buffering the whole payload in memory. They default to UTF-8, or accept any Encoding via the constructor.

using System.Security.Cryptography;

using var output = new MemoryStream();
using (var cryptoStream = new CryptoStream(output, new ToBase91Transform(), CryptoStreamMode.Write))
{
    sourceStream.CopyTo(cryptoStream);
}

using var decoded = new MemoryStream();
using (var cryptoStream = new CryptoStream(encodedStream, new FromBase91Transform(), CryptoStreamMode.Read))
{
    cryptoStream.CopyTo(decoded);
}

License

The MIT License (MIT)

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 was computed.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 was computed.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.6 is compatible.  netstandard2.0 was computed.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
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NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last Updated
1.0.0 77 9/20/2026