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()
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Available from iOS 13.0
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