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在我的应用程序中有一个密码字段。当用户输入密码时,它应该加密该密码并存储到数据库中。当用户登录该应用程序时,应从数据库中获取密码并进行解密。

是否可以??

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7 回答 7

20

你可以看看这个链接,它可以让你朝着正确的方向开始。

话虽如此,通常的做法是存储密码本身的哈希值,而不是密码的加密版本。哈希将允许您检查用户是否输入了正确的密码(通过将数据库中的哈希值与用户输入的哈希值进行比较),而无需知道实际密码是什么。

这样做的好处是它通常更简单、更安全,因为您不需要加密/解密任何值。使用散列的缺点是您永远无法用户发送他们的密码(如果您打算提供某种“忘记我的密码”功能),而是您必须将其重置为一个新的随机密码。

于 2012-05-22T05:11:58.730 回答
3

如果您不希望使用 ASP.NET 成员资格和角色提供程序,这可能对您有用:

    /// <summary>
    /// Decrypts the specified encryption key.
    /// </summary>
    /// <param name="encryptionKey">The encryption key.</param>
    /// <param name="cipherString">The cipher string.</param>
    /// <param name="useHashing">if set to <c>true</c> [use hashing].</param>
    /// <returns>
    ///  The decrypted string based on the key
    /// </returns>
    public static string Decrypt(string encryptionKey, string cipherString, bool useHashing)
    {
        byte[] keyArray;
        //get the byte code of the string

        byte[] toEncryptArray = Convert.FromBase64String(cipherString);

        System.Configuration.AppSettingsReader settingsReader =
                                            new AppSettingsReader();

        if (useHashing)
        {
            //if hashing was used get the hash code with regards to your key
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(encryptionKey));
            //release any resource held by the MD5CryptoServiceProvider

            hashmd5.Clear();
        }
        else
        {
            //if hashing was not implemented get the byte code of the key
            keyArray = UTF8Encoding.UTF8.GetBytes(encryptionKey);
        }

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        //set the secret key for the tripleDES algorithm
        tdes.Key = keyArray;
        //mode of operation. there are other 4 modes.
        //We choose ECB(Electronic code Book)

        tdes.Mode = CipherMode.ECB;
        //padding mode(if any extra byte added)
        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateDecryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(
                             toEncryptArray, 0, toEncryptArray.Length);
        //Release resources held by TripleDes Encryptor
        tdes.Clear();
        //return the Clear decrypted TEXT
        return UTF8Encoding.UTF8.GetString(resultArray);
    }

    /// <summary>
    /// Encrypts the specified to encrypt.
    /// </summary>
    /// <param name="toEncrypt">To encrypt.</param>
    /// <param name="useHashing">if set to <c>true</c> [use hashing].</param>
    /// <returns>
    /// The encrypted string to be stored in the Database
    /// </returns>
    public static string Encrypt(string encryptionKey, string toEncrypt, bool useHashing)
    {
        byte[] keyArray;
        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        System.Configuration.AppSettingsReader settingsReader =
                                            new AppSettingsReader();

        //If hashing use get hashcode regards to your key
        if (useHashing)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(encryptionKey));
            //Always release the resources and flush data
            // of the Cryptographic service provide. Best Practice

            hashmd5.Clear();
        }
        else
            keyArray = UTF8Encoding.UTF8.GetBytes(encryptionKey);

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        //set the secret key for the tripleDES algorithm
        tdes.Key = keyArray;
        //mode of operation. there are other 4 modes.
        //We choose ECB(Electronic code Book)
        tdes.Mode = CipherMode.ECB;
        //padding mode(if any extra byte added)

        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateEncryptor();
        //transform the specified region of bytes array to resultArray
        byte[] resultArray =
          cTransform.TransformFinalBlock(toEncryptArray, 0,
          toEncryptArray.Length);
        //Release resources held by TripleDes Encryptor
        tdes.Clear();
        //Return the encrypted data into unreadable string format
        return Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }

使用上述两种方法,您可以在将密码字符串保存到数据库时对其进行加密,并在检索时对其进行解密。

于 2012-05-24T03:59:36.820 回答
2

您可以在 SQL SERVER 中创建 SQLCLR UDF,我使用两种主要方法以加密格式保存密码。

Pwdencryp()t 加密密码,返回加密字符串。这在您设置密码时使用,并且加密的密码存储在 master..syslogins 表中。

http://msdn.microsoft.com/en-us/library/dd822791(v=sql.105).aspx

Pwdcompare() 接受明文密码和加密密码,并通过对明文密码进行加密并比较两者来检查它们是否匹配。当您键入密码以登录 SQL Server 时,将调用此例程。

http://msdn.microsoft.com/en-us/library/dd822792.aspx

于 2012-05-22T05:41:35.737 回答
1

当您配置ASP.NET 密码散列和密码盐时,ASP.NET SQL Server 成员资格提供程序为您提供此功能passwordFormat="Hashed"

但是,如果您希望自己推出自己的产品,那么您将需要研究 Salted Password。例如C# 中的哈希和盐密码

于 2012-05-22T05:11:36.953 回答
1

执行此操作的简单方法如下:

string hashedpassword= FormsAuthentication.HashPasswordForStoringInConfigFile("your password", "SHA1");
于 2015-07-03T07:36:29.723 回答
0

获取哈希密码的最简单方法如下。 FormsAuthentication.HashPasswordForStoringInConfigFile("value of string", FormsAuthPasswordFormat.MD5.ToString());

于 2012-05-22T06:02:16.650 回答
-1
 string hashedPassword = Security.HashSHA1(txtPassword.Value.Trim());
  public class Security
    {
        public static string HashSHA1(string value)
        {
            var sha1 = System.Security.Cryptography.SHA1.Create();
            var inputBytes = Encoding.ASCII.GetBytes(value);
            var hash = sha1.ComputeHash(inputBytes);

            var sb = new StringBuilder();
            for (var i = 0; i < hash.Length; i++)
            {
                sb.Append(hash[i].ToString("X2"));
            }
            return sb.ToString();
        }
    }
于 2020-11-20T10:52:18.877 回答