MD5Helper辅助类
DES加密和解密
public class MD5Helper { ///DES加密 ///sKey public string MD5Encrypt(string pToEncrypt, string sKey) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt); 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(); } ///DES解密 public string MD5Decrypt(string pToDecrypt, string sKey) { 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; } 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(); StringBuilder ret = new StringBuilder(); return System.Text.Encoding.Default.GetString(ms.ToArray()); } public string MD5Encrypt(string pToEncrypt, string sKey, out string msg) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); StringBuilder ret = new StringBuilder(); 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 = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); foreach (byte b in ms.ToArray()) { ret.AppendFormat("{0:X2}", b); } } catch (Exception ex) { msg = "ERR:" + ex.Message; } return ret.ToString(); } ///DES解密 public string MD5Decrypt(string pToDecrypt, string sKey, out string msg) { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); 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 = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); StringBuilder ret = new StringBuilder(); _value = Encoding.Default.GetString(ms.ToArray()); } catch (Exception ex) { msg = "ERR:" + ex.Message; } return _value; } }
调用方法
MD5Helper md5 = new MD5Helper(); string key = ConfigurationManager.AppSettings["MD5Encrypt"]; loginPassword = md5.MD5Encrypt(loginPassword, key);