直接上代码了。

public class DESEncrypt    {        //密钥        private static string key = "mykey";        /// 
        /// DES加密        /// 
        /// 需要加密的字符串        /// 
     
      返回已加密的字符串
             public static string DesEncrypt(string encryptString)        {            if (string.IsNullOrEmpty(encryptString))            {                return string.Empty;            }            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        /// 
        /// 需要解密的字符串        /// 
     
      已解密的字符串
             public static string DesDecrypt(string decryptString)        {            if (string.IsNullOrEmpty(decryptString))            {                return string.Empty ;            }            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());        }    }

　

注：

//密钥

private static string key = "mykey";

 

mykey 是设定的密钥，自行设置一个就可以了。

参考：