求大神帮忙~~~~~关于DES加密的问题

Question

论坛的各位大神，帮个忙。我想通过DES加密来存储我的各种密码~我想用一个固定的Key来加密字符。问题来了
        public string GenerateKey()
        {
            DESCryptoServiceProvider desCrypto = (DESCryptoServiceProvider)DESCryptoServiceProvider.Create();
            return ASCIIEncoding.ASCII.GetString(desCrypto.Key);
        }
每次的Key都是变化的，怎么把我的口令（例如 hack+=3? ）转换为Key？我试过强制转换，但是不知怎么操作。大神们，求解！！！求具体做法！！

Answer 1

using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;class CryptoMemoryStream
{
// Main method.
    public static void Main()
    {
        // Create a new DES key.
        DESCryptoServiceProvider key = new DESCryptoServiceProvider();        // Encrypt a string to a byte array.
        byte[] buffer = Encrypt("This is some plaintext!", key);        // Decrypt the byte array back to a string.
        string plaintext =  Decrypt(buffer, key);        // Display the plaintext value to the console.
        Console.WriteLine(plaintext);
    }
    
// Encrypt the string.
    public static byte[] Encrypt(string PlainText, SymmetricAlgorithm key)
    {
        // Create a memory stream.
        MemoryStream ms = new MemoryStream();        // Create a CryptoStream using the memory stream and the 
        // CSP DES key.  
        CryptoStream encStream = new CryptoStream(ms, key.CreateEncryptor(), CryptoStreamMode.Write);        // Create a StreamWriter to write a string
        // to the stream.
        StreamWriter sw = new StreamWriter(encStream);        // Write the plaintext to the stream.
        sw.WriteLine(PlainText);        // Close the StreamWriter and CryptoStream.
        sw.Close();
        encStream.Close();        // Get an array of bytes that represents
        // the memory stream.
        byte[] buffer = ms.ToArray();        // Close the memory stream.
        ms.Close();        // Return the encrypted byte array.
        return buffer;
    }   // Decrypt the byte array.
    public static string Decrypt(byte[] CypherText, SymmetricAlgorithm key)
    {
        // Create a memory stream to the passed buffer.
        MemoryStream ms = new MemoryStream(CypherText);        // Create a CryptoStream using the memory stream and the 
        // CSP DES key. 
        CryptoStream encStream = new CryptoStream(ms, key.CreateDecryptor(), CryptoStreamMode.Read);        // Create a StreamReader for reading the stream.
        StreamReader sr = new StreamReader(encStream);        // Read the stream as a string.
        string val = sr.ReadLine();        // Close the streams.
        sr.Close();
        encStream.Close();
        ms.Close();
            
        return val;
    }
}

Answer 2

 byte[] key = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }
 这种格式

Answer 3

这样Key就可以用来加密string了吗？byte[] 里的数组可以自定义吧？

Answer 4

   /// <summary> 
        /// 加密字符串 
        /// 注意:密钥必须为８位 
        /// </summary> 
        /// <param name="strText">字符串</param> 
        /// <param name="encryptKey">密钥</param>
        /// <return>加密后字符串</return>
        public static string DesEncrypt(string strText) 
        {
            string outString="";
            byte[] byKey=null; 
            byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; 
            try 
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(encryptKey.Substring(0, encryptKey.Length)); 
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); 
                MemoryStream ms = new MemoryStream(); 
                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ; 
                cs.Write(inputByteArray, 0, inputByteArray.Length); 
                cs.FlushFinalBlock();
                outString = Convert.ToBase64String(ms.ToArray()); 
            } 
            catch(System.Exception) 
            {
                outString = ""; 
            }            return outString;
        }         /// <summary> 
        /// 解密字符串 
        /// </summary> 
        /// <param name="strText">加了密的字符串</param> 
        /// <param name="decryptKey">密钥</param> 
        public static string DesDecrypt(string strText) 
        {
            string outString = "";
            byte[] byKey = null; 
            byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};
            byte[] inputByteArray = new Byte[strText.Length]; 
            try 
            {
                byKey = System.Text.Encoding.UTF8.GetBytes(decryptKey.Substring(0, decryptKey.Length)); 
                DESCryptoServiceProvider des = new DESCryptoServiceProvider();
                inputByteArray = Convert.FromBase64String(strText); 
                MemoryStream ms = new MemoryStream(); 
                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); 
                cs.Write(inputByteArray, 0, inputByteArray.Length); 
                cs.FlushFinalBlock(); 
                System.Text.Encoding encoding = new System.Text.UTF8Encoding(); 
                outString = encoding.GetString(ms.ToArray()); 
            } 
            catch(System.Exception) 
            {
                outString = ""; 
            }            return outString;
        }         #endregion