DESCryptoServiceProvider加密及解密需要先声明一个key,根据这个可以进行加密及解密,所以是可逆的,与MD5不可逆加密是不一样的;话不多说,上案例:
public static readonly string myKey = "0Ja3c6K9";
/// <summary> /// 加密方法 /// </summary> /// <param name="pToEncrypt">需要加密字符串</param> /// <param name="sKey">密钥</param> /// <returns>加密后的字符串</returns> public static string Encrypt(string pToEncrypt, string sKey) { try { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte数组中 //原来使用的UTF8编码,我改成Unicode编码了,不行 byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); //建立加密对象的密钥和偏移量 //使得输入密码必须输入英文文本 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.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(); } catch (Exception ex) { //System.Web.HttpContext.Current.Response.Write("写入配置信息失败,详细信息:" + ex.Message.Replace(" ", "").Replace("'", "")); } return ""; } /// <summary> /// 解密方法 /// </summary> /// <param name="pToDecrypt">需要解密的字符串</param> /// <param name="sKey">密匙</param> /// <returns>解密后的字符串</returns> public static string Decrypt(string pToDecrypt, string sKey) { try { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = new byte[pToDecrypt.Length / 2]; for (int x = 0; x < pToDecrypt.Length / 2; x++) { int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16)); inputByteArray[x] = (byte)i; } //建立加密对象的密钥和偏移量,此值重要,不能修改 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); //建立StringBuild对象,CreateDecrypt使用的是流对象,必须把解密后的文本变成流对象 StringBuilder ret = new StringBuilder(); return System.Text.Encoding.Default.GetString(ms.ToArray()); } catch (Exception ex) { MessageBox.Show("读取配置信息失败,详细信息:" + ex.Message.Replace(" ", "").Replace("'", "")); } return ""; }