CryptoKit: Custom hash algorithm conforming to HashFunction & Digest

flocked · March 4, 2023, 7:17pm

I try creating a custom hash algorithm that conforms to the HashFunction & Digest protocol of CryptoKit. The algorithm is an implementation of the OpenSubtitles hash which takes the first and last 8 bytes of a data to generate the hash.

Here is my current implementation:

gist.github.com

https://gist.github.com/flocked/eb8a3d5cb7fa987fc2295f92c59445ac

OSHash.swift

import Foundation

public class OSHash {
    enum HashError: Error {
        case invalidFile
        case fileToSmall
    }
    
    private static let chunkSize: Int = 65536
    private static let UInt64Size = 8

This file has been truncated. show original