The aes-interop-example from dinochiesa

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I've been a developer for a long time. Back in the day, I did C#, but more recently it's been JavaScript, Java, and a little Golang.

I like to build all sorts of tools that I think will be handy. and I like crypto.

Some examples of web-based tools I've built:

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[Help] slowAES.decrypt in C#

Hi,

Please take a look here: https://stackoverflow.com/q/31912000/9248173

I'm trying to solve the problem in C# using .net framework cryptography and this is what try:

    public static string GenerateCookie(string script)
    {
        var split = script.Split(new[] { "toNumbers(\"", "\")" }, StringSplitOptions.RemoveEmptyEntries)
                    .Where(s => s.Length == 32)
                    .ToArray();

        if (split.Length != 3)
            return null;

        var key = StringToByteArray(split[0]);
        var iv = StringToByteArray(split[1]);
        var bytesIn = StringToByteArray(split[2]);

        RijndaelManaged rijndael = new RijndaelManaged();
        rijndael.KeySize = key.Length * 8;
        rijndael.Padding = PaddingMode.None;
        rijndael.Key = key;
        rijndael.IV = iv;
        rijndael.Mode = CipherMode.CBC;

        var decrypter = rijndael.CreateDecryptor();
        var decrypted = decrypter.TransformFinalBlock(bytesIn, 0, bytesIn.Length);

        decrypter.Dispose();
        rijndael.Dispose();

        var hex = BitConverter.ToString(decrypted).Replace("-", "");
        var expireTime = new string(script.Skip(script.IndexOf("expires="))
                                    .TakeWhile(c => c != ';')
                                    .ToArray())
                                    .Replace("expires=", string.Empty);

        if (string.IsNullOrEmpty(expireTime))
        {
            return null;
        }

        return string.Format("__test={0}; expires={1}; path=/", hex, expireTime);
    }

And not worked, Also PaddingMode.PKCS7 give's me "Padding is invalid and cannot be removed" error.

I think the problem should be crypto, Do i do decryption correctly ?

Thanks.

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