An UInt256 library written in Swift 4

algo, algorithm, bigint, biginteger, carthage, cocoapods, divide-and-conquer, ios, karatsuba-multiplication, macos, playground, swift, swift-package-manager, swift4, uint256



Build Status Language Platform Carthage Compatible CocoaPods Compatible License

A UInt256 library written in Swift 4, heavily influenced by CryptoCoinSwift/UInt256


The main struct UInt256 conforms to the following protocols:

  • FixedWidthInteger: Currently under development
  • UnsignedInteger: this should be the top level protocol: see here
  • BinaryInteger
  • Numeric
  • CustomStringConvertible
  • Hashable
  • Comparable, Equatable
  • etc (please see to the source code)

A complete set of arithmetic operators are implemented, so are properties and functions commonly found on other UInt family members (Uint64, UInt32, UInt16, etc).

The library itself can be installed as a Swift Package, a Carthage package or a CocoaPod. A playground is also included as a testbench.

Other features such as fast multiplication are in the development pipeline. Please feel free to submit new feature request by opening issues here on GitHub. 😃


  • 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 "mryu87/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/mryu87/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/mryu87/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/mryu87/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.


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


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