DESCryptoServiceProvider 加密与解密

    public string Encrypt(string stringToEncrypt, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        byte[] inputByteArray = Encoding.GetEncoding("UTF-8").GetBytes(stringToEncrypt);
        des.Key = ASCIIEncoding.UTF8.GetBytes(sKey);
        des.IV = ASCIIEncoding.UTF8.GetBytes(sKey);
        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();

        StringBuilder ret = new StringBuilder();
        foreach (byte b in ms.ToArray())
        {
            ret.AppendFormat("{0:X2}", b);
        }
        ret.ToString();
        return ret.ToString();
    }

    public string Decrypt(string stringToDecrypt, string sKey)
    {
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();

        byte[] inputByteArray = new byte[stringToDecrypt.Length / 2];
        for (int x = 0; x < stringToDecrypt.Length / 2; x++)
        {
            int i = (Convert.ToInt32(stringToDecrypt.Substring(x * 2, 2), 16));
            inputByteArray[x] = (byte)i;
        }

        des.Key = ASCIIEncoding.UTF8.GetBytes(sKey);
        des.IV = ASCIIEncoding.UTF8.GetBytes(sKey);
        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();

        StringBuilder ret = new StringBuilder();

        return System.Text.Encoding.Default.GetString(ms.ToArray());
    }

 

 

//

 

public sealed class DESEncrypt
    ...{
       
private DESEncrypt()
        ...{
           
//
           
// TODO: 在此处添加构造函数逻辑
           
//
        }

       
private static string key = "zhoufoxcn";

       
/**////


       
/// 对称加密解密的密钥
       
///

        public static string Key
        ...{
           
get
            ...{
               
return key;
            }
           
set
            ...{
                key
= value;
            }
        }

       
/**////
       
/// DES加密
       
///

       
///
       
///
        public static string DesEncrypt(string encryptString)
        ...{
           
byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));
           
byte[] keyIV = keyBytes;
           
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
            DESCryptoServiceProvider provider
= new DESCryptoServiceProvider();
            MemoryStream mStream
= new MemoryStream();
            CryptoStream cStream
= new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray,
0, inputByteArray.Length);
            cStream.FlushFinalBlock();
           
return Convert.ToBase64String(mStream.ToArray());
        }

       
/**////
       
/// DES解密
       
///

       
///
       
///
        public static string DesDecrypt(string decryptString)
        ...{
           
byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));
           
byte[] keyIV = keyBytes;
           
byte[] inputByteArray = Convert.FromBase64String(decryptString);
            DESCryptoServiceProvider provider
= new DESCryptoServiceProvider();
            MemoryStream mStream
= new MemoryStream();
            CryptoStream cStream
= new CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray,
0, inputByteArray.Length);
            cStream.FlushFinalBlock();
           
return Encoding.UTF8.GetString(mStream.ToArray());
        }
    }

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