用c#加密和解密数据库

Question

我想将文本框中的数据存储到数据库中，但应该对其进行加密然后通过一些搜索键显示这些数据我使用了一种加密方法并且它工作正常主要问题是显示解密的数据

 string encClass = AESencDec.Decrypt(txt_class.Text);
 SqlConnection connection = new SqlConnection(ConnectionString);
        SqlCommand command = new SqlCommand("select * from nuclear where Class='" + encClass + "'", connection);
        connection.Open();
        command.CommandType = CommandType.Text;
        command.ExecuteNonQuery();
        DataTable dt = new DataTable();
        SqlDataAdapter da = new SqlDataAdapter();                             
        da.Fill(dt);
        dataGridView1.DataSource = dt;
        connection.Close();

它实际上是从数据库中读取数据并显示，但我想知道如何显示它已解密？？？

这是我用于此项目的 Decrypt class

 public static string Decrypt(string text)

    {
        string hash = "f0xle@rn";
        byte[] plaintextbytes = Convert.FromBase64String(text);
        using (MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider())
        {
            byte[] keys = md5.ComputeHash(UTF8Encoding.UTF8.GetBytes(hash));
            using (TripleDESCryptoServiceProvider triples = new TripleDESCryptoServiceProvider() { Key = keys, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 })
            {
                ICryptoTransform transform = triples.CreateDecryptor();
                byte[] results = transform.TransformFinalBlock(plaintextbytes, 0, plaintextbytes.Length);
                return UTF8Encoding.UTF8.GetString(results);
            }
        }

    }

这是加密函数

 public static string Encrypt(string text)
    {
         string hash = "f0xle@rn";
         byte[] plaintextbytes = UTF8Encoding.UTF8.GetBytes(text);
        using (MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider())
        {
            byte[] keys = md5.ComputeHash(UTF8Encoding.UTF8.GetBytes(hash));
                using (TripleDESCryptoServiceProvider triples = new TripleDESCryptoServiceProvider() {Key = keys, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 })
            {
                ICryptoTransform transform = triples.CreateEncryptor();
                byte[] results = transform.TransformFinalBlock(plaintextbytes, 0, plaintextbytes.Length);
                return Convert.ToBase64String(results);
            }
        }
    }

Answer 1

这是一个显示使用测试数据更新数据表的示例。您可以更新它以使用数据库中的任何列名：

    int rowCount = 5;
    DataTable table = new DataTable();
    table.Columns.Add(new DataColumn("id", typeof(String)));
    table.Columns.Add(new DataColumn("encrypted", typeof(String)));
    table.Columns.Add(new DataColumn("decrypted", typeof(String)));

    //Write test encrypted data to data table
    for(int i = 0; i < rowCount; i++) 
    {
        string clearText = "test" + i.ToString();
        string cipherText = Encrypt(clearText);
        table.Rows.Add(new object[] {i.ToString(), cipherText, ""});
    }

    //Decrypt each item, and assign result to decrypted column
    foreach (DataRow row in table.Rows) 
    {
        row["decrypted"] = Decrypt(row["encrypted"].ToString());
    }

因此您的数据适配器填充了一个数据表。您可以在将其应用于数据源之前迭代行并解密：

da.Fill(dt);

foreach(DataRow row in dt.Rows)
{
    row["name of encrypted column"] = Decrypt(row["name of encrypted column"].ToString());
}

dataGridView1.DataSource = dt;

用c#加密和解密数据库

encrypt and decrypt a database with c#

c#

sql

database

encryption

windows-applications