.NETやっぱり便利

たったこれだけ

sha256test.cs


using System;
using System.IO;
using System.Linq;
using System.Security.Cryptography;

class Program
{
    [STAThread]
    static void Main(string[] args)
    {
        if (args.Length == 0) { return; }

        byte[] byteValue = File.ReadAllBytes(args[0]);
        SHA256 crypto = new SHA256CryptoServiceProvider();
        byte[] hashValue = crypto.ComputeHash(byteValue);
        Console.WriteLine( String.Join("", hashValue.Select(x=>x.ToString("x2")).ToArray()) );
    }
}

動確

下記のzipに対してSHA256一致確認済み。
https://www.ruby-lang.org/ja/news/2019/10/02/ruby-2-4-9-released/


>sha256test ruby-2.4.9.zip
4ad1c32554319661f2872bb978ff2cd520bc4593681a6476b4c5e7f330172d8b