加密

using System; using System.Collections.Generic; using System.Text; using System.Security.Cryptography; using System.IO; using System.Runtime.Serialization.Formatters.Binary; using System.Data; using System.Data.SqlClient; namespace SQLServerImp { public class Tool { static string _EmailKey = "&Email"; /// <summary> /// 密钥 /// </summary> public static string EmailKey { get { return Tool._EmailKey; } } /// <summary> /// 解密方法（前两位用*代替） /// </summary> /// <param name="pToDecrypt">待解密的字符</param> /// <param name="sKey">密钥</param> /// <returns>解密后的字符</returns> public static string DESDeCode(string pToDecrypt, string sKey) { try { if (string.IsNullOrEmpty(pToDecrypt)) return null; DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Convert.FromBase64String(pToDecrypt); des.Key = Encoding.ASCII.GetBytes(sKey); des.IV = Encoding.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(); if (Encoding.UTF8.GetString(ms.ToArray()).Length >= 2) { string newstr = Encoding.Default.GetString(ms.ToArray()); return "**" + newstr.Substring(2); } else { return "**"; } } catch { if (pToDecrypt.Length >= 2) { return "**" + pToDecrypt.Substring(2); } else return "**"; } } /// <summary> /// 加密方法 /// </summary> /// <param name="pToEncrypt">待加密字符</param> /// <param name="sKey">密钥</param> /// <returns>加密后的字符</returns> public static string DESEnCode(string pToEncrypt, string sKey) { if (string.IsNullOrEmpty(pToEncrypt)) return null; pToEncrypt = pToEncrypt.ToLower(); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt); des.Key = Encoding.ASCII.GetBytes(sKey); des.IV = Encoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// 解密datatable中的指定列数据，并将这些列的前两位字母换成** /// </summary> /// <param name="cnames">要解密的列题标</param> /// <param name="dt">待处理的datable</param> public static DataTable DESDeDataTble(IList<string> cnames, DataTable dt) { if (dt == null || dt.Rows.Count == 0 || cnames == null || cnames.Count == 0) return dt; for (int i = 0; i < dt.Rows.Count; i++) { for (int j = 0; j < cnames.Count; j++) { if (dt.Columns.Contains(cnames[j].Trim()) && !string.IsNullOrEmpty(dt.Rows[i][cnames[j].Trim()].ToString())) { string str = dt.Rows[i][cnames[j].Trim()].ToString(); if (!string.IsNullOrEmpty(str)) { string newstr = DESDeCode(str, EmailKey);//解密 dt.Rows[i][cnames[j]] = newstr; } } } } return dt; } /// <summary> /// 解密dataset中的datable的指定列数据，并将这些列的前两位字母换成** /// </summary> /// <param name="cnames">要解密的列标题</param> /// <param name="ds">待处理的dataset</param> /// <returns>处理后的dataset</returns> public static DataSet DESDeDataSet(IList<string> cnames, DataSet ds) { if (ds == null || ds.Tables.Count == 0 || cnames == null || cnames.Count == 0) return ds; DataSet newds = new DataSet(); for (int i = 0; i < ds.Tables.Count; i++) { DataTable dt = ds.Tables[i]; DataTable newdt = Tool.DESDeDataTble(cnames, dt); newds.Merge(newdt); } return newds; } /// <summary> /// 解密方法 /// </summary> /// <param name="pToEncrypt">需要解密的字符</param> /// <param name="sKey">密钥</param> /// <returns>解密后的字符</returns> public static string DESDeString(string pToDecrypt, string sKey) { if (string.IsNullOrEmpty(pToDecrypt)) return null; try { DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Convert.FromBase64String(pToDecrypt); des.Key = Encoding.ASCII.GetBytes(sKey); des.IV = Encoding.ASCII.GetBytes(sKey); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Encoding.UTF8.GetString(ms.ToArray()); } catch { return pToDecrypt; } } /// <summary> /// 解密datatable中的指定列数据 /// </summary> /// <param name="cnames">要解密的列题标</param> /// <param name="dt">待处理的datable</param> public static DataTable DESDeDataTbleCRM(IList<string> cnames, DataTable dt) { if (dt == null || dt.Rows.Count == 0 || cnames == null || cnames.Count == 0) return dt; for (int i = 0; i < dt.Rows.Count; i++) { for (int j = 0; j < cnames.Count; j++) { if (dt.Columns.Contains(cnames[j].Trim()) && !string.IsNullOrEmpty(dt.Rows[i][cnames[j].Trim()].ToString())) { string str = dt.Rows[i][cnames[j].Trim()].ToString(); if (!string.IsNullOrEmpty(str)) { try { string newstr = Tool.DESDeString(str, EmailKey);//解密 dt.Rows[i][cnames[j]] = newstr; } catch { continue; } } } } } return dt; } /// <summary> /// 解密dataset中的datable的指定列数据 /// </summary> /// <param name="cnames">要解密的列标题</param> /// <param name="ds">待处理的dataset</param> /// <returns>处理后的dataset</returns> public static DataSet DESDeDataSetCRM(IList<string> cnames, DataSet ds) { if (ds == null || ds.Tables.Count == 0 || cnames == null || cnames.Count == 0) return ds; DataSet newds = new DataSet(); for (int i = 0; i < ds.Tables.Count; i++) { DataTable dt = ds.Tables[i]; DataTable newdt = Tool.DESDeDataTbleCRM(cnames, dt); newds.Merge(newdt); } return newds; } /// <summary> /// md5加密 /// </summary> /// <param name="value"></param> /// <param name="key"></param> /// <returns></returns> public static string EncodePassword(string value, string key) { byte[] hashbyte = new MD5CryptoServiceProvider().ComputeHash(Encoding.ASCII.GetBytes(key + value)); string newstr = ""; for (int i = 0; i < hashbyte.Length; i++) newstr += hashbyte[i].ToString("X").PadLeft(2, '0'); return newstr.ToLower(); } } }