using System; using System.IO; using System.Security.Cryptography; using System.Text; //加密字符串,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了) //public string DesEncrypt(string strText, string strEncrKey) //解密字符串,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了) //public string DesDecrypt(string strText,string sDecrKey) //加密数据文件,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了) //public void DesEncrypt(string m_InFilePath,string m_OutFilePath,string strEncrKey) //解密数据文件,注意strEncrKey的长度为8位(如果要增加或者减少key长度,调整IV的长度就是了) //public void DesDecrypt(string m_InFilePath,string m_OutFilePath,string sDecrKey) //MD5加密 //public string MD5Encrypt(string strText) using Common; namespace Commons { /// <summary> /// DES对称加解密、AES RijndaelManaged加解密、Base64加密解密、MD5加密等操作辅助类 /// </summary> public sealed class EncodeHelper { #region DES对称加密解密 public const string DEFAULT_ENCRYPT_KEY = "12345678"; /// <summary> /// 使用默认加密 /// </summary> /// <param name="strText"></param> /// <returns></returns> public static string DesEncrypt(string strText) { try { return DesEncrypt(strText, DEFAULT_ENCRYPT_KEY); } catch { return ""; } } /// <summary> /// 使用默认解密 /// </summary> /// <param name="strText"></param> /// <returns></returns> public static string DesDecrypt(string strText) { try { return DesDecrypt(strText, DEFAULT_ENCRYPT_KEY); } catch { return ""; } } /// <summary> /// Encrypt the string /// Attention:key must be 8 bits /// </summary> /// <param name="strText">string</param> /// <param name="strEncrKey">key</param> /// <returns></returns> public static string DesEncrypt(string strText, string strEncrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray()); } /// <summary> /// Decrypt string /// Attention:key must be 8 bits /// </summary> /// <param name="strText">Decrypt string</param> /// <param name="sDecrKey">key</param> /// <returns>output string</returns> public static string DesDecrypt(string strText, string sDecrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byte[] inputByteArray = new Byte[strText.Length]; byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); inputByteArray = Convert.FromBase64String(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); Encoding encoding = new UTF8Encoding(); return encoding.GetString(ms.ToArray()); } /// <summary> /// Encrypt files /// Attention:key must be 8 bits /// </summary> /// <param name="m_InFilePath">Encrypt file path</param> /// <param name="m_OutFilePath">output file</param> /// <param name="strEncrKey">key</param> public static void DesEncrypt(string m_InFilePath, string m_OutFilePath, string strEncrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8)); FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time. DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while (rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; } encStream.Close(); fout.Close(); fin.Close(); } /// <summary> /// Decrypt files /// Attention:key must be 8 bits /// </summary> /// <param name="m_InFilePath">Decrypt filepath</param> /// <param name="m_OutFilePath">output filepath</param> /// <param name="sDecrKey">key</param> public static void DesDecrypt(string m_InFilePath, string m_OutFilePath, string sDecrKey) { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8)); FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read); FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write); fout.SetLength(0); //Create variables to help with read and write. byte[] bin = new byte[100]; //This is intermediate storage for the encryption. long rdlen = 0; //This is the total number of bytes written. long totlen = fin.Length; //This is the total length of the input file. int len; //This is the number of bytes to be written at a time. DES des = new DESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); //Read from the input file, then encrypt and write to the output file. while (rdlen < totlen) { len = fin.Read(bin, 0, 100); encStream.Write(bin, 0, len); rdlen = rdlen + len; } encStream.Close(); fout.Close(); fin.Close(); } #endregion #region 对称加密算法AES RijndaelManaged加密解密 private static readonly string Default_AES_Key = "@#kim123"; private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53,0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F }; /// <summary> /// 对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法) /// </summary> /// <param name="encryptString">待加密字符串</param> /// <returns>加密结果字符串</returns> public static string AES_Encrypt(string encryptString) { return AES_Encrypt(encryptString, Default_AES_Key); } /// <summary> /// 对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法) /// </summary> /// <param name="encryptString">待加密字符串</param> /// <param name="encryptKey">加密密钥，须半角字符</param> /// <returns>加密结果字符串</returns> public static string AES_Encrypt(string encryptString, string encryptKey) { encryptKey = GetSubString(encryptKey, 32, ""); encryptKey = encryptKey.PadRight(32, ' '); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32)); rijndaelProvider.IV = Keys; ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor(); byte[] inputData = Encoding.UTF8.GetBytes(encryptString); byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length); return Convert.ToBase64String(encryptedData); } /// <summary> /// 对称加密算法AES RijndaelManaged解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <returns>解密成功返回解密后的字符串,失败返源串</returns> public static string AES_Decrypt(string decryptString) { return AES_Decrypt(decryptString, Default_AES_Key); } /// <summary> /// 对称加密算法AES RijndaelManaged解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <param name="decryptKey">解密密钥,和加密密钥相同</param> /// <returns>解密成功返回解密后的字符串,失败返回空</returns> public static string AES_Decrypt(string decryptString, string decryptKey) { try { decryptKey = GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ' '); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor(); byte[] inputData = Convert.FromBase64String(decryptString); byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length); return Encoding.UTF8.GetString(decryptedData); } catch { return string.Empty; } } /// <summary> /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分 /// </summary> /// <param name="sourceString">源字符串</param> /// <param name="length">所取字符串字节长度</param> /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param> /// <returns>某字符串的一部分</returns> private static string GetSubString(string sourceString, int length, string tailString) { return GetSubString(sourceString, 0, length, tailString); } /// <summary> /// 按字节长度(按字节,一个汉字为2个字节)取得某字符串的一部分 /// </summary> /// <param name="sourceString">源字符串</param> /// <param name="startIndex">索引位置，以0开始</param> /// <param name="length">所取字符串字节长度</param> /// <param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，一般为"...")</param> /// <returns>某字符串的一部分</returns> private static string GetSubString(string sourceString, int startIndex, int length, string tailString) { string myResult = sourceString; //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3) if (System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\xAC00-\xD7A3]+")) { //当截取的起始位置超出字段串长度时 if (startIndex >= sourceString.Length) { return string.Empty; } else { return sourceString.Substring(startIndex, ((length + startIndex) > sourceString.Length) ? (sourceString.Length - startIndex) : length); } } //中文字符，如"中国人民abcd123" if (length <= 0) { return string.Empty; } byte[] bytesSource = Encoding.Default.GetBytes(sourceString); //当字符串长度大于起始位置 if (bytesSource.Length > startIndex) { int endIndex = bytesSource.Length; //当要截取的长度在字符串的有效长度范围内 if (bytesSource.Length > (startIndex + length)) { endIndex = length + startIndex; } else { //当不在有效范围内时,只取到字符串的结尾 length = bytesSource.Length - startIndex; tailString = ""; } int[] anResultFlag = new int[length]; int nFlag = 0; //字节大于127为双字节字符 for (int i = startIndex; i < endIndex; i++) { if (bytesSource[i] > 127) { nFlag++; if (nFlag == 3) { nFlag = 1; } } else { nFlag = 0; } anResultFlag[i] = nFlag; } //最后一个字节为双字节字符的一半 if ((bytesSource[endIndex - 1] > 127) && (anResultFlag[length - 1] == 1)) { length = length + 1; } byte[] bsResult = new byte[length]; Array.Copy(bytesSource, startIndex, bsResult, 0, length); myResult = Encoding.Default.GetString(bsResult); myResult = myResult + tailString; return myResult; } return string.Empty; } /// <summary> /// 加密文件流 /// </summary> /// <param name="fs"></param> /// <returns></returns> public static CryptoStream AES_EncryptStrream(FileStream fs, string decryptKey) { decryptKey = GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ' '); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform encrypto = rijndaelProvider.CreateEncryptor(); CryptoStream cytptostreamEncr = new CryptoStream(fs, encrypto, CryptoStreamMode.Write); return cytptostreamEncr; } /// <summary> /// 解密文件流 /// </summary> /// <param name="fs"></param> /// <returns></returns> public static CryptoStream AES_DecryptStream(FileStream fs, string decryptKey) { decryptKey = GetSubString(decryptKey, 32, ""); decryptKey = decryptKey.PadRight(32, ' '); RijndaelManaged rijndaelProvider = new RijndaelManaged(); rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey); rijndaelProvider.IV = Keys; ICryptoTransform Decrypto = rijndaelProvider.CreateDecryptor(); CryptoStream cytptostreamDecr = new CryptoStream(fs, Decrypto, CryptoStreamMode.Read); return cytptostreamDecr; } /// <summary> /// 对指定文件加密 /// </summary> /// <param name="InputFile"></param> /// <param name="OutputFile"></param> /// <returns></returns> public static bool AES_EncryptFile(string InputFile, string OutputFile) { try { string decryptKey = "www.iqidi.com"; FileStream fr = new FileStream(InputFile, FileMode.Open); FileStream fren = new FileStream(OutputFile, FileMode.Create); CryptoStream Enfr = AES_EncryptStrream(fren, decryptKey); byte[] bytearrayinput = new byte[fr.Length]; fr.Read(bytearrayinput, 0, bytearrayinput.Length); Enfr.Write(bytearrayinput, 0, bytearrayinput.Length); Enfr.Close(); fr.Close(); fren.Close(); } catch { //文件异常 return false; } return true; } /// <summary> /// 对指定的文件解压缩 /// </summary> /// <param name="InputFile"></param> /// <param name="OutputFile"></param> /// <returns></returns> public static bool AES_DecryptFile(string InputFile, string OutputFile) { try { string decryptKey = "www.iqidi.com"; FileStream fr = new FileStream(InputFile, FileMode.Open); FileStream frde = new FileStream(OutputFile, FileMode.Create); CryptoStream Defr = AES_DecryptStream(fr, decryptKey); byte[] bytearrayoutput = new byte[1024]; int m_count = 0; do { m_count = Defr.Read(bytearrayoutput, 0, bytearrayoutput.Length); frde.Write(bytearrayoutput, 0, m_count); if (m_count < bytearrayoutput.Length) break; } while (true); Defr.Close(); fr.Close(); frde.Close(); } catch { //文件异常 return false; } return true; } #endregion #region Base64加密解密 /// <summary> /// Base64是一種使用64基的位置計數法。它使用2的最大次方來代表僅可列印的ASCII 字元。 /// 這使它可用來作為電子郵件的傳輸編碼。在Base64中的變數使用字元A-Z、a-z和0-9 ， /// 這樣共有62個字元，用來作為開始的64個數字，最後兩個用來作為數字的符號在不同的 /// 系統中而不同。 /// Base64加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Base64Encrypt(string str) { byte[] encbuff = System.Text.Encoding.UTF8.GetBytes(str); return Convert.ToBase64String(encbuff); } /// <summary> /// Base64解密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Base64Decrypt(string str) { byte[] decbuff = Convert.FromBase64String(str); return System.Text.Encoding.UTF8.GetString(decbuff); } #endregion #region MD5加密 /// <summary> /// MD5 Encrypt /// </summary> /// <param name="strText">text</param> /// <returns>md5 Encrypt string</returns> public static string MD5Encrypt(string strText) { MD5 md5 = new MD5CryptoServiceProvider(); byte[] result = md5.ComputeHash(Encoding.Default.GetBytes(strText)); return Encoding.Default.GetString(result); } public static string MD5EncryptHash(String input) { MD5 md5 = new MD5CryptoServiceProvider(); //the GetBytes method returns byte array equavalent of a string byte[] res = md5.ComputeHash(Encoding.Default.GetBytes(input), 0, input.Length); char[] temp = new char[res.Length]; //copy to a char array which can be passed to a String constructor Array.Copy(res, temp, res.Length); //return the result as a string return new String(temp); } public static string MD5EncryptHashHex(String input) { MD5 md5 = new MD5CryptoServiceProvider(); //the GetBytes method returns byte array equavalent of a string byte[] res = md5.ComputeHash(Encoding.Default.GetBytes(input), 0, input.Length); String returnThis = string.Empty; for (int i = 0; i < res.Length; i++) { returnThis += Uri.HexEscape((char)res[i]); } returnThis = returnThis.Replace("%", ""); returnThis = returnThis.ToLower(); return returnThis; } /// <summary> /// MD5 三次加密算法.计算过程: (QQ使用) /// 1. 验证码转为大写 /// 2. 将密码使用这个方法进行三次加密后,与验证码进行叠加 /// 3. 然后将叠加后的内容再次MD5一下,得到最终验证码的值 /// </summary> /// <param name="s"></param> /// <returns></returns> public static string EncyptMD5_3_16(string s) { MD5 md5 = MD5CryptoServiceProvider.Create(); byte[] bytes = System.Text.Encoding.ASCII.GetBytes(s); byte[] bytes1 = md5.ComputeHash(bytes); byte[] bytes2 = md5.ComputeHash(bytes1); byte[] bytes3 = md5.ComputeHash(bytes2); StringBuilder sb = new StringBuilder(); foreach (var item in bytes3) { sb.Append(item.ToString("x").PadLeft(2, '0')); } return sb.ToString().ToUpper(); } #endregion /// <summary> /// SHA256函数 /// </summary> /// <param name="str">原始字符串</param> /// <returns>SHA256结果(返回长度为44字节的字符串)</returns> public static string SHA256(string str) { byte[] SHA256Data = Encoding.UTF8.GetBytes(str); SHA256Managed Sha256 = new SHA256Managed(); byte[] Result = Sha256.ComputeHash(SHA256Data); return Convert.ToBase64String(Result); //返回长度为44字节的字符串 } /// <summary> /// 加密字符串 /// </summary> /// <param name="input"></param> /// <returns></returns> public static string EncryptString(string input) { return MD5Util.AddMD5Profix(Base64Util.Encrypt(MD5Util.AddMD5Profix(input))); //return Base64.Encrypt(MD5.AddMD5Profix(Base64.Encrypt(input))); } /// <summary> /// 解密加过密的字符串 /// </summary> /// <param name="input"></param> /// <param name="throwException">解密失败是否抛异常</param> /// <returns></returns> public static string DecryptString(string input, bool throwException) { string res = ""; try { res = input;// Base64.Decrypt(input); if (MD5Util.ValidateValue(res)) { return MD5Util.RemoveMD5Profix(Base64Util.Decrypt(MD5Util.RemoveMD5Profix(res))); } else { throw new Exception("字符串无法转换成功！"); } } catch { if (throwException) { throw; } else { return ""; } } } } }
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