How to calculate the SHA hash of a String or Data instance
Swift version: 5.6
iOS 13 introduced a new framework called CryptoKit, which adds important cryptographic functionality such as encryption and hashing.
If you want to calculate the hash value of a string you need to convert it to an instance of Data like this:
let inputString = "Hello, world!"
let inputData = Data(inputString.utf8)You then call the hash(data:) method of whichever kind of hash you want: SHA-256, SHA-384, or SHA-512. For example, if you wanted to calculate the SHA-256 hash of your data you’d use this:
let hashed = SHA256.hash(data: inputData)Finally, you can print out the textual representation of the hash – what we’d considered the user-facing hash string itself – like this:
print(hashed.description)Obviously if you have an instance of Data you want to hash, you can put that directly into SHA256.hash(data:).
If you want to get the string of your hash, you should convert using the String(format:) initializer, like this:
let hashString = hashed.compactMap { String(format: "%02x", $0) }.joined()
SPONSORED Let’s face it, SwiftUI previews are limited, slow, and painful. Judo takes a different approach to building visually—think Interface Builder for SwiftUI. Build your interface in a completely visual canvas, then drag and drop into your Xcode project and wire up button clicks to custom code. Download the Mac App and start your free trial today!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 13.0
Similar solutions…
- How to create hash values from objects using Hasher
- How to calculate the ROT13 of a string
- How to fix “argument of #selector refers to instance method that is not exposed to Objective-C”
- How to calculate the point where two lines intersect
- How to calculate the Manhattan distance between two CGPoints
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
