C#如何实现des的加解密

Question

请问各位附件的DES加解密如何实现？
输入的值是十六进制的，2个字节。
密钥也是十六进制，2个字节。
要求加密或解密后的值也是十六进制的，2个字节。

Answer 1

图片似乎传不上去
图片地址是：
http://www.5899222.com/DES.JPG

Answer 2

  public static void Encrypt(string pathIn, string pathOut, string password)
        {
            try
            {
                byte[] iv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                byte[] key = System.Text.Encoding.UTF8.GetBytes(password);
                System.IO.FileStream fs = new FileStream(pathIn, FileMode.Open, FileAccess.Read);
                System.IO.FileStream outfs = new FileStream(pathOut, FileMode.OpenOrCreate, FileAccess.Write);
                outfs.SetLength(0);
                byte[] myBytes = new byte[100];
                long myInLength = 0;
                long myLength = fs.Length;
                System.Security.Cryptography.DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
                System.Security.Cryptography.CryptoStream cs = new CryptoStream(outfs, dsp.CreateEncryptor(key, iv), CryptoStreamMode.Write);
                while (myInLength < myLength)
                {
                    int myLen = fs.Read(myBytes, 0, 100);
                    cs.Write(myBytes, 0, myLen);
                    myInLength += myLen;
                }
                cs.Close();
                fs.Close();
                outfs.Close();
            }
            catch (IOException ioex)
            {
                Log.debug("Encrypt(pathIn, pathOut, password): " + ioex.Message + "\r\nSource:" + ioex.Source + "\r\nStackTrace:" + ioex.StackTrace);
            }
        }        public static void Decrypt(string pathIn, string pathOut, string password)
        {
            try
            {
                System.IO.FileStream fs = new FileStream(pathIn, FileMode.Open, FileAccess.Read);
                System.IO.FileStream outfs = new FileStream(pathOut, FileMode.OpenOrCreate, FileAccess.Write);
                outfs.SetLength(0);
                long myLength = fs.Length;
                long myInLength = 0;
                byte[] iv = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
                byte[] key = System.Text.Encoding.UTF8.GetBytes(password);
                System.Security.Cryptography.DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();
                System.Security.Cryptography.CryptoStream cs = new CryptoStream(outfs, dsp.CreateDecryptor(key, iv), CryptoStreamMode.Write);
                byte[] myBytes = new byte[100];
                while (myInLength < myLength)
                {
                    int myLen = fs.Read(myBytes, 0, 100);
                    cs.Write(myBytes, 0, myLen);
                    myInLength += myLen;
                }
                cs.Close();
                fs.Close();
                outfs.Close();
            }
            catch (IOException ioex)
            {
                Log.debug("Dncrypt(pathIn, pathOut, password): " + ioex.Message + "\r\nSource:" + ioex.Source + "\r\nStackTrace:" + ioex.StackTrace);
            }
        }把这个改改，

Answer 3

参考。。
/// <summary>
/// Encrypt the string
/// Attention:key must be 8 bits
/// </summary>
/// <param name="strText">string</param>
/// <param name="strEncrKey">key</param>
/// <returns></returns>
public string DesEncrypt(string strText, string strEncrKey)
{
byte[] byKey = null;
byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
try
{
byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
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();
return Convert.ToBase64String(ms.ToArray());
}
catch (System.Exception error)
{
// MessageBox.Show(error.Message);
return "error:" + error.Message + "\r";
}
}
/// <summary>
/// Decrypt string
/// Attention:key must be 8 bits
/// </summary>
/// <param name="strText">Decrypt string</param>
/// <param name="sDecrKey">key</param>
/// <returns>output string</returns>
public string DesDecrypt(string strText, string sDecrKey)
{
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(sDecrKey.Substring(0, 8));
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();
return encoding.GetString(ms.ToArray());
}
catch (System.Exception error)
{
// MessageBox.Show(error.Message);
return "error:" + error.Message + "\r";
}
}