Question

我正在创建一个使用Outlook帐户发送电子邮件的消息传递应用程序。但是，我不确定将电子邮件密码存储在用户计算机上的正确步骤。假设我有以下代码：

SmtpClient SmtpServer = new SmtpClient("smtp.live.com");
var mail = new MailMessage();
mail.From = new MailAddress("youremail@hotmail.com");
mail.To.Add("to@gmail.com");
mail.Subject = "Test Mail - 1";
mail.IsBodyHtml = true;
string htmlBody;
htmlBody = "Write some HTML code here";
mail.Body = htmlBody;
SmtpServer.Port = 587;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.Credentials = new System.Net.NetworkCredential("youremail@hotmail.com", "password");
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);

显然，我不想要＆＃34;密码＆＃34;在我的应用程序中存储为字符串。将密码存储在用户计算机上的理想/适当解决方案是什么，以便我可以将其读入我的应用程序，并将其传递给NetworkCredential构造函数？

我已经阅读了here和here。第一个链接建议将其存储在文件或注册表中，不确定如何将其存储在注册表中。我如何将其正确存储在文件中？

Answer 1

最好的方法是序列化凭据然后对其进行加密，然后将加密的字节写入文件。撤销该流程将有助于检索数据。

首先，创建一个类 AES.cs ：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace AES_Password_Storer
{
    public static class AES
    {
        public static byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
    {
        byte[] encryptedBytes = null;

        // Set your salt here, change it to meet your flavor:
        // The salt bytes must be at least 8 bytes.
        byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };

        using (MemoryStream ms = new MemoryStream())
        {
            using (RijndaelManaged AES = new RijndaelManaged())
            {
                AES.KeySize = 256;
                AES.BlockSize = 128;

                var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                AES.Key = key.GetBytes(AES.KeySize / 8);
                AES.IV = key.GetBytes(AES.BlockSize / 8);

                AES.Mode = CipherMode.CBC;

                using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
                    cs.Close();
                }
                encryptedBytes = ms.ToArray();
            }
        }

        return encryptedBytes;
    }
    public static byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
    {
        byte[] decryptedBytes = null;

        // Set your salt here, change it to meet your flavor:
        // The salt bytes must be at least 8 bytes.
        byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };

        using (MemoryStream ms = new MemoryStream())
        {
            using (RijndaelManaged AES = new RijndaelManaged())
            {
                AES.KeySize = 256;
                AES.BlockSize = 128;

                var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
                AES.Key = key.GetBytes(AES.KeySize / 8);
                AES.IV = key.GetBytes(AES.BlockSize / 8);

                AES.Mode = CipherMode.CBC;

                using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
                    cs.Close();
                }
                decryptedBytes = ms.ToArray();
            }
        }

        return decryptedBytes;
    }
}
}

接下来，创建一个类 Credentials.cs ：N.B。 - 现在我创建了Credentials类，只保留一个用户的凭据。您可以通过创建列表来调整它以容纳多个。

[Serializable]
public class Credentials
{
public string Email { get; set; }
public string Password { get; set; }
}

接下来，进行加密（将数据写入文件）：

        XmlSerializer xs = new XmlSerializer(typeof(Credentials));
        MemoryStream ms = new MemoryStream();
        xs.Serialize(ms, new Credentials() { Email = "email@service.com",   Password = "passworduser" });
        byte[] encrypted = AES.AES_Encrypt(ms.ToArray(), Encoding.UTF8.GetBytes("encryptionkey")); //This is the key
        File.WriteAllBytes("passwordfile.pwd", encrypted);

现在，解密：

        MemoryStream ms = new   MemoryStream(AES.AES_Decrypt(File.ReadAllBytes("passwordfile.pwd"), Encoding.UTF8.GetBytes("encryptionkey"))); //Here goes the key
        XmlSerializer xs = new XmlSerializer(typeof(Credentials));
        Credentials c = (Credentials)xs.Deserialize(ms);
        // This 'c' contains your credentials.

现在在加密和解密的代码中，有一个字符串＆＃34; encryptionkey＆＃34;。这是所有这一切的关键。你可以（实际上应该）改变它并将其保存在一个安全的地方（在你的应用程序中）。

C＃正确存储电子邮件密码

1 个答案: