Question

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。

有可能吗？

Answer 1

您可以查看this链接，这可以帮助您开始正确的方向。

尽管如此，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。散列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，您永远不能向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新的，随意的。

Answer 2

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。

Answer 3

ASP.NET SQL Server成员资格提供程序在您配置passwordFormat="Hashed" ASP.NET password hashing and password salt

时为您提供此功能

但是你想要自己动手，那么你会想要研究盐渍密码。例如Hash and salt passwords in C#

Answer 4

您可以在SQL SERVER中创建SQLCLR UDF，我使用两种主要方法来保存Enchedted格式的密码。

Pwdencryp（）t加密密码，返回加密的字符串。设置密码时使用此选项，加密密码存储在master..syslogins表中。

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

Pwdcompare（）接受清除密码和加密密码，并通过加密清除密码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

Answer 5

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

Answer 6

执行此操作的简单方法如下：

string hashedpassword= FormsAuthentication.HashPasswordForStoringInConfigFile("your password", "SHA1");

Answer 7

 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();
        }
    }

如何在从Web应用程序输入的数据库中以加密格式存储密码？

7 个答案: