C# md5 hash not matching node generated md5 hash-CodePudding

I'm trying to generate an md5 hash and store it as a hex string via C# program (not related to passwords!), but I need to replicate an existing node method. When I check my generated hashes against ones generated by node they do not match. I suspect it has something to do with encoding, but I've tried both UTF8 and ASCII and am not getting much luck. Any help appreciated.

The node method is below:

 public static hash(...data: string[]): string {

        var md5sum = createHash('md5');
        md5sum.update(data?.join() ?? '');

        var hash = md5sum.digest('hex');
        return hash;

    }

C# method

 public static string CalculateHash(string[] inputs)
        {
            var hashInput = String.Join("", inputs);

            using (var md5 = System.Security.Cryptography.MD5.Create())
            {
                byte[] inputBytes = System.Text.Encoding.UTF8.GetBytes(hashInput);
                byte[] hashBytes = md5.ComputeHash(inputBytes);
                var sb = new StringBuilder();
                for (int i = 0; i < hashBytes.Length; i  )
                {
                    sb.Append(hashBytes[i].ToString("x2"));
                }
                return sb.ToString();
            }
        }

CodePudding user response：

JavaScripts data?.join() joins strings with a comma, i.e. ["Hello", "World"].join() yields "Hello,World".

In C#, you explicitly join the strings without separator, so String.Join("", new[] {"Hello", "World"}) yields "HelloWorld".

If you change your C# code line to

var hashInput = String.Join(",", inputs);

both methods yield the same result (C# fiddle, JavaScript fiddle).

CodePudding user response：

I don't quite understand your question but maybe that's what you mean

static void Main()
{
    Console.WriteLine(GetHashMD5("Hello World"));
    Console.WriteLine(GetHashMD5("Hello World"));
}

public static string GetHashMD5(string value)
{
    using (MD5 md5 = MD5.Create())
    {
        var hash = md5.ComputeHash(Encoding.UTF8.GetBytes(value));
        var hashed = new StringBuilder(hash.Length * 2);

        foreach (byte b in hash)
        {
            // x = Lowercase   |    X = Uppercase
            hashed.Append(b.ToString("x4"));
        }
        return hashed.ToString();
    }
}

Output:

00b1000a008d00b1006400e000750041000500b700a9009b00e7002e003f00e5 00b1000a008d00b1006400e000750041000500b700a9009b00e7002e003f00e5