c# - 使用 AES 256 加密和解密查询字符串值

Question

我正在使用以下代码加密/解密查询字符串并将其从一个页面传递到另一个页面。结果输出缺少“+”(请参阅​​问题底部)。由于我已经在使用 urlencode/urldecode，我该怎么做才能确保“+”通过？

//加密页面

    protected void Page_Load(object sender, EventArgs e)
    {
        string text = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";            
        Response.Write("256:" + Decrypt256(Encrypt256(text)));
        Response.Write(string.Format("<br/><a href=\"decrypt.aspx?p={0}\">{0}</a>", HttpUtility.UrlEncode(Encrypt256(text))));            
    }


    private const string AesIV256 = @"!QAZ2WSX#EDC4RFV";
    private const string AesKey256 = @"5TGB&YHN7UJM(IK<5TGB&YHN7UJM(IK<";


    private string Encrypt256(string text)
    {            
        // AesCryptoServiceProvider
        AesCryptoServiceProvider aes = new AesCryptoServiceProvider();            
        aes.BlockSize = 128;
        aes.KeySize = 256;
        aes.IV = Encoding.UTF8.GetBytes(AesIV256);
        aes.Key = Encoding.UTF8.GetBytes(AesKey256);
        aes.Mode = CipherMode.CBC;
        aes.Padding = PaddingMode.PKCS7;

        // Convert string to byte array
        byte[] src = Encoding.Unicode.GetBytes(text);

        // encryption
        using (ICryptoTransform encrypt = aes.CreateEncryptor())
        {
            byte[] dest = encrypt.TransformFinalBlock(src, 0, src.Length);

            // Convert byte array to Base64 strings
            return Convert.ToBase64String(dest);
        }
    }

    /// <summary>
    /// AES decryption
    /// </summary>
    private string Decrypt256(string text)
    {            
        // AesCryptoServiceProvider
        AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
        aes.BlockSize = 128;
        aes.KeySize = 256;
        aes.IV = Encoding.UTF8.GetBytes(AesIV256);
        aes.Key = Encoding.UTF8.GetBytes(AesKey256);
        aes.Mode = CipherMode.CBC;
        aes.Padding = PaddingMode.PKCS7;

        // Convert Base64 strings to byte array
        byte[] src = System.Convert.FromBase64String(text);

        // decryption
        using (ICryptoTransform decrypt = aes.CreateDecryptor())
        {
            byte[] dest = decrypt.TransformFinalBlock(src, 0, src.Length);
            return Encoding.Unicode.GetString(dest);
        }
    }

解密页面(我用这个页面打印出我从第一页解密的字符串，然后比较我在URL中得到的内容:

     protected void Page_Load(object sender, EventArgs e)
    {
        string urlValue = HttpUtility.UrlDecode(Request.QueryString["p"].Trim());
     Decrypt256(Encoding.ASCII.GetString(s2));            

        Response.Write(urlValue + "<br /><br />");     
        Response.Write("AUwsHc8j/llULnuwVnspNwolBUAhl5GFqC6iOrUN5euZFrOgFVypqTGfhAaooLxa0Fko+9KGtRh3UcQJtzkfSw==");            

    }

最终结果是下面两行(第一行是URL的输出)。除了第一个 URL(编码/解码的查询字符串结果)缺少“+”符号外，它们几乎匹配。知道如何避免这种情况吗？

AUwsHc8j/llULnuwVnspNwolBUAhl5GFqC6iOrUN5euZFrOgFVypqTGfhAaooLxa0Fko 9KGtRh3UcQJtzkfSw==

AUwsHc8j/llULnuwVnspNwolBUAhl5GFqC6iOrUN5euZFrOgFVypqTGfhAaooLxa0Fko+9KGtRh3UcQJtzkfSw==

Answer 1

确定修复了它，只是删除了 urldecode 方法。解码似乎是自动发生的。