摘要：
DES加密和解密publicclassMD5Helper｛//DES加密///sKeypublicstringMD5Encryption（stringpToEncrypion，stringsKey）｛DESCryptoServiceProviders＝newDESCrypt服务提供商（）；byte〔〕inputByteArray＝Encoding。默认值。GetBytes
DES加密和解密
public classMD5Helper { ///DES加密 ///sKey public string MD5Encrypt(string pToEncrypt, stringsKey) { DESCryptoServiceProvider des = newDESCryptoServiceProvider(); byte[] inputByteArray =Encoding.Default.GetBytes(pToEncrypt); des.Key =ASCIIEncoding.ASCII.GetBytes(sKey); des.IV =ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = newMemoryStream(); CryptoStream cs = newCryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = newStringBuilder(); foreach (byte b inms.ToArray()) { ret.AppendFormat("{0:X2}", b); } ret.ToString(); returnret.ToString(); } ///DES解密 public string MD5Decrypt(string pToDecrypt, stringsKey) { DESCryptoServiceProvider des = newDESCryptoServiceProvider(); 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; } des.Key =ASCIIEncoding.ASCII.GetBytes(sKey); des.IV =ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = newMemoryStream(); CryptoStream cs = newCryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = newStringBuilder(); returnSystem.Text.Encoding.Default.GetString(ms.ToArray()); } public string MD5Encrypt(string pToEncrypt, string sKey, out stringmsg) { DESCryptoServiceProvider des = newDESCryptoServiceProvider(); StringBuilder ret = newStringBuilder(); try { byte[] inputByteArray =Encoding.Default.GetBytes(pToEncrypt); msg = "SUCC:"; int length =sKey.Length; if (length < 8) { msg = "ERR:密钥长度不能小于8"; return ""; } int _dif = length - 8; int _sub_Index = _dif / 2 + _dif % 2; _sub_Index = _sub_Index <= 0 ? 0: _sub_Index; sKey = sKey.Substring(_sub_Index, 8); des.Key =ASCIIEncoding.ASCII.GetBytes(sKey); des.IV =ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = newMemoryStream(); CryptoStream cs = newCryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); foreach (byte b inms.ToArray()) { ret.AppendFormat("{0:X2}", b); } } catch(Exception ex) { msg = "ERR:" +ex.Message; } returnret.ToString(); } ///DES解密 public string MD5Decrypt(string pToDecrypt, string sKey, out stringmsg) { DESCryptoServiceProvider des = newDESCryptoServiceProvider(); string _value = ""; try { msg = "SUCC:"; int length =sKey.Length; if (length < 8) { msg = "ERR:密钥长度不能小于8"; return ""; } int _dif = length - 8; int _sub_Index = _dif / 2 + _dif % 2; _sub_Index = _sub_Index <= 0 ? 0: _sub_Index; sKey = sKey.Substring(_sub_Index, 8); 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; } des.Key =ASCIIEncoding.ASCII.GetBytes(sKey); des.IV =ASCIIEncoding.ASCII.GetBytes(sKey); MemoryStream ms = newMemoryStream(); CryptoStream cs = newCryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = newStringBuilder(); _value =Encoding.Default.GetString(ms.ToArray()); } catch(Exception ex) { msg = "ERR:" +ex.Message; } return_value; } }
调用方法
MD5Helper md5 = newMD5Helper(); string key = ConfigurationManager.AppSettings["MD5Encrypt"]; loginPassword = md5.MD5Encrypt(loginPassword, key);