asp.net实现的MD5加密和DES加解密算法类完整示例_实用技巧_

 #region MD5算法 public string md5(string str, int code) { if (code == 32) //32位加密 { return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower(); } else //16位MD5加密（取32位加密的9~25字符） { return System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(str, "MD5").ToLower().Substring(8, 16); } } #endregion 

 #region DESEncrypt DES加密 // 
 /// 进行DES加密。 /// 
 /// 要加密的字符串。 /// 密钥，且必须为8位。 /// 以Base64格式返回的加密字符串。 public string DESEncrypt(string pToEncrypt, string sKey) { using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt); des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); System.IO.MemoryStream ms = new System.IO.MemoryStream(); using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); cs.Close(); } string str = Convert.ToBase64String(ms.ToArray()); ms.Close(); return str; } } #endregion 

 #region DESDecrypt DES解密 /// 
 /// 进行DES解密。 /// 
 /// 要解密的以Base64 /// 密钥，且必须为8位。 /// 已解密的字符串。 public string DESDecrypt(string pToDecrypt, string sKey) { byte[] inputByteArray = Convert.FromBase64String(pToDecrypt); using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); System.IO.MemoryStream ms = new System.IO.MemoryStream(); using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); cs.Close(); } string str = Encoding.UTF8.GetString(ms.ToArray()); ms.Close(); return str; } } #endregion