asp.net实现的DES加密解密操作示例

 //加密方法 private string encrypt(string strToEncrypt) { if (strToEncrypt == null || strToEncrypt == "") return strToEncrypt; DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //把字符串放到byte数组中，主意编码方式 byte[] inputByteArray = Encoding.Default.GetBytes(strToEncrypt); //建立加密对象的密钥和偏移量 des.Key = new byte[] { 1, 3, 5, 7, 2, 4, 6, 8 }; des.Mode = CipherMode.ECB; 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); } return ret.ToString(); } //解密方法 private string Decrypt(string pToDecrypt) { if (pToDecrypt == null || pToDecrypt == "") return pToDecrypt; try { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); //Put the input string into the byte array 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; } //key des.Key = new byte[] { 1, 3, 5, 7, 2, 4, 6, 8 }; ; //des.IV = ASCIIEncoding.ASCII.GetBytes(sKey); des.Mode = CipherMode.ECB; 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 Exp) { return String<b style="color:transparent">来源gao@dai!ma.com搞$代^码网</b>.Empty; } }