c#中的MD5加密与DES加解密

MD5加密

using System.Security.Cryptography;
using System.Text;

#region 加密密码，UserMd5(string str1)
protected string UserMd5(string str1)
{
string cl1 = str1;
string pwd = "";
MD5 md5 = MD5.Create();
// 加密后是一个字节类型的数组
byte[] s=md5.ComputeHash(Encoding.Unicode.GetBytes(cl1));
// 通过使用循环，将字节类型的数组转换为字符串，此字符串是常规字符格式化所得
for(int i = 0 ; i < s.Length; i++)
{
// 将得到的字符串使用十六进制类型格式。格式后的字符是小写的字母，如果使用大写（X）则格式后的字符是大写字符
pwd = pwd + s[i].ToString("x");
}
return pwd;
}
#endregion

 

 

DES加解密

 

public static string EncryptMethod(string rs) //加密
  {
   byte[] desKey = new  byte[]{0x16, 0x09, 0x14, 0x15, 0x07, 0x01, 0x05, 0x08};
   byte[] desIV = new  byte[]{0x16, 0x09, 0x14, 0x15, 0x07, 0x01, 0x05, 0x08};

   DESCryptoServiceProvider des = new DESCryptoServiceProvider();
   try
   {
    byte[] inputByteArray = Encoding.Default.GetBytes(rs);
    //byte[] inputByteArray=Encoding.Unicode.GetBytes(rs);

    des.Key = desKey;  // ASCIIEncoding.ASCII.GetBytes(sKey);
    des.IV = desIV;   //ASCIIEncoding.ASCII.GetBytes(sKey);
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),
     CryptoStreamMode.Write);
    //Write the byte array into the crypto stream
    //(It will end up in the memory stream)
    cs.Write(inputByteArray, 0, inputByteArray.Length);
    cs.FlushFinalBlock();

    //Get the data back from the memory stream, and into a string
    StringBuilder ret = new StringBuilder();
    foreach(byte b in ms.ToArray())
    {
     //Format as hex
     ret.AppendFormat("{0:X2}", b);
    }
    ret.ToString();
    return ret.ToString();
   }
   catch
   {
    return rs;
   }
   finally
   {
    des = null;
   }
  }
public static string DecryptMethod(string rs)    //解密
  {
   byte[] desKey = new  byte[]{0x16, 0x09, 0x14, 0x15, 0x07, 0x01, 0x05, 0x08};
   byte[] desIV = new  byte[]{0x16, 0x09, 0x14, 0x15, 0x07, 0x01, 0x05, 0x08};


   DESCryptoServiceProvider des = new DESCryptoServiceProvider();
   try
   {
    //Put the input string into the byte array
    byte[] inputByteArray = new byte[rs.Length / 2];
    for(int x = 0; x < rs.Length / 2; x++)
    {
     int i = (Convert.ToInt32(rs.Substring(x * 2, 2), 16));
     inputByteArray[x] = (byte)i;
    }

    des.Key = desKey;   //ASCIIEncoding.ASCII.GetBytes(sKey);
    des.IV = desIV;    //ASCIIEncoding.ASCII.GetBytes(sKey);
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write);
    //Flush the data through the crypto stream into the memory stream
    cs.Write(inputByteArray, 0, inputByteArray.Length);
    cs.FlushFinalBlock();

    //Get the decrypted data back from the memory stream
    StringBuilder ret = new StringBuilder();
 
    return System.Text.Encoding.Default.GetString(ms.ToArray());
   }
   catch
   {
    return rs;
   }
   finally
   {
    des = null;
   }
  }

 

 

DES加解密1

 

public static byte[] DESKey = new byte[] {0x82, 0xBC, 0xA1, 0x6A, 0xF5, 0x87, 0x3B, 0xE6, 0x59, 0x6A, 0x32, 0x64, 0x7F, 0x3A, 0x2A, 0xBB, 0x2B, 0x68, 0xE2, 0x5F, 0x06, 0xFB, 0xB8, 0x2D, 0x67, 0xB3, 0x55, 0x19, 0x4E, 0xB8, 0xBF, 0xDD };
  //public static byte[] DESKey = new byte[32];
  public static void GetKey()
  {
   string sKey = "1234567890abcdefghij1234567890yz";
   char[] cKey = sKey.ToCharArray();
   for(int i=0;i<32;i++)
    DESKey[i] = (byte)cKey[i];
  }
  //注册表操作using Microsoft.Win32;
  private void TestCode()
  {
   string sValue = RegistryManager.DESEncrypt(textBox1.Text.Trim());   
   sValue = RegistryManager.DESDecrypt(sValue);   
  }
  /// <summary>
  /// DES加密
  /// </summary>
  /// <param name="strSource">待加密字串</param>
  /// <param name="key">32位Key值</param>
  /// <returns>加密后的字符串</returns>
  public static string DESEncrypt(string strSource)
  {
   return DESEncrypt(strSource, DESKey);
  }
  public static string DESEncrypt(string strSource,byte[] key)
  {
   GetKey();
   SymmetricAlgorithm sa = Rijndael.Create();
   sa.Key = key;
   sa.Mode= CipherMode.ECB;
   sa.Padding = PaddingMode.Zeros;
   MemoryStream ms = new MemoryStream();
   CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write);
   byte[] byt = Encoding.Unicode.GetBytes(strSource);
   cs.Write(byt, 0, byt.Length);
   cs.FlushFinalBlock();
   cs.Close();
   return Convert.ToBase64String(ms.ToArray());
  }
  /// <summary>
  /// DES解密
  /// </summary>
  /// <param name="strSource">待解密的字串</param>
  /// <param name="key">32位Key值</param>
  /// <returns>解密后的字符串</returns>
  public static string DESDecrypt(string strSource)
  {
   return DESDecrypt(strSource, DESKey);
  }
  public static string DESDecrypt(string strSource,byte[] key)
  {
   SymmetricAlgorithm sa = Rijndael.Create();
   sa.Key = key;
   sa.Mode = CipherMode.ECB;
   sa.Padding = PaddingMode.Zeros;
   ICryptoTransform ct = sa.CreateDecryptor();
   byte[] byt = Convert.FromBase64String(strSource);
   MemoryStream ms = new MemoryStream(byt);
   CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read);
   StreamReader sr = new StreamReader(cs, Encoding.Unicode);
   return sr.ReadToEnd();
  }

 

 

 

有些加密的还可以起到别的作用，因为.net的mobile上不支持一些特殊的算法（支持MD5但MD5不可解密的）上面写的两种都不支持所以只好另写：

private string aa(string bb)
  {

   byte[] by=new byte[bb.Length];
   by=System.Text.Encoding.UTF8.GetBytes(bb);
  
   string r=Convert.ToBase64String(by);
   return r;
  }

private string bb(string aa)
  {
   byte[] by=Convert.FromBase64String(aa); 
   string r=Encoding.UTF8.GetString(by);
   return r;
  }