Build Status Language Platform Carthage Compatible CocoaPods Compatible Coverage Status

A UInt256 library written in Swift 4, inspired by CryptoCoinSwift/UInt256


This library provides a UInt256 struct that conforms nicely to Swift's FixedWidthInteger and UnsignedInteger protocols. According to Apple, the two are the necessary top level protocols for an UInt member: here

It supports a complete set of arithmetic operations, as well as properties and functions that are common to other UInt family members such as UInt64, UInt32, UInt8, etc. The library leverages Karatsuba fast multiplication algorithm, Divide and Conquer division algorithm, Barrett Algorithm for division and other efficient algos for other operators. Other features include integer literal representation (ExpressibleByIntegerLiteral), default description (CustomStringConvertible) and Hashable.

The library is written entirely in Swift 4. It can be installed as a Swift Package, a Carthage package or a CocoaPod. And a playground is also included as a testbench.

Please feel free to submit new feature requests and report issues here on GitHub. 😃

Please use the playground to try out all the features!

Swift Protocol Conformance

The main struct UInt256 conforms strictly to the following protocols:

  • FixedWidthInteger
  • UnsignedInteger
  • BinaryInteger
  • Numeric
  • Comparable
  • Equatable
  • CustomStringConvertible
  • Hashable


  • iOS 8.0+ / macOS 10.10+
  • Xcode 8.0+
  • Swift 4


If you need any help or have a feature request, please open an issue here on GitHub; if you found a bug or want to help with the development, please submit a pull request. All contributions are welcome! 😃



First, make sure have Carthage installed:

brew update
brew install carthage

To integrate this library into your Xcode project, simply put the following line into your carfile:

github "hyugit/UInt256"

Finally, run carthage update to build the framework, and drag the built framework (either UInt256_iOS.framework or UInt256_macOS.framework) into your Xcode project

Swift Package Manager

This library supports Swift Package Manager as well. If you have your swift package config set up already, please add the following line to your Package.swift:

dependencies: [
    .package(url: "https://github.com/hyugit/UInt256.git", from: "4.0.0")


Install CocoaPods following its official guide

To integrate UInt256 into your Xcode project using CocoaPods, specify it in your Podfile:

source 'https://github.com/CocoaPods/Specs.git'
platform :ios, '10.0'

target '<Your Target Name>' do
    pod 'UInt256', :git => 'https://github.com/hyugit/UInt256.git'

And run pod install afterwards.

Manual installation

You can also add this library manually to your project.

In the terminal, under your top level project directory, add this library as a git submodule by running the following command:

git submodule add https://github.com/hyugit/UInt256.git

Have Xcode open, go to your new UInt256 subdirectory in Finder, drag UInt256.xcodeproj into the project navigator of your project. Remember to embed the framework to your build target.

Next steps...

  • add documentation
  • look into leveraging GPU/Metal
  • benchmark
  • make UInt256 conform to FixedWidthInteger
  • add an example, preferably through a playground
  • add CocoaPods support
  • more tests, test coverage, corner cases, lint, code review
  • automate build and test runs
  • karatsuba multiplication
  • fast modulo, division, and other algos


This library is released under the MIT license. Please see LICENSE


  • Swift Tools 4.0.0
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Last updated: Tue Mar 14 2023 10:01:34 GMT-0500 (GMT-05:00)