C#加密算法汇总(转载)http://www.cnblogs.com/zengxiangzhan/archive/2010/01/30/1659687.html

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

方法一：     //须添加对System.Web的引用     using System.Web.Security;           ...           /// <summary>     /// SHA1加密字符串     /// </summary>     /// <param name="source">源字符串</param>     /// <returns>加密后的字符串</returns>     public string SHA1(string source)     {         return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");     }         /// <summary>     /// MD5加密字符串     /// </summary>     /// <param name="source">源字符串</param>     /// <returns>加密后的字符串</returns>     public string MD5(string source)     {         return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;     }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

方法二(可逆加密解密)：     using System.Security.Cryptography;           ...           public string Encode(string data)     {         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);               DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();         int i = cryptoProvider.KeySize;         MemoryStream ms = new MemoryStream();         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);               StreamWriter sw = new StreamWriter(cst);         sw.Write(data);         sw.Flush();         cst.FlushFinalBlock();         sw.Flush();         return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);           }           public string Decode(string data)     {         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);               byte[] byEnc;         try         {             byEnc = Convert.FromBase64String(data);         }         catch         {             return null;         }               DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();         MemoryStream ms = new MemoryStream(byEnc);         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);         StreamReader sr = new StreamReader(cst);         return sr.ReadToEnd();     }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

方法三(MD5不可逆)：     using System.Security.Cryptography;           ...           //MD5不可逆加密           //32位加密           public string GetMD5_32(string s, string _input_charset)     {         MD5 md5 = new MD5CryptoServiceProvider();         byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));         StringBuilder sb = new StringBuilder(32);         for (int i = 0; i < t.Length; i++)         {             sb.Append(t[i].ToString("x").PadLeft(2, '0'));         }         return sb.ToString();     }           //16位加密     public static string GetMd5_16(string ConvertString)     {         MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();         string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);         t2 = t2.Replace("-", "");         return t2;     }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83

方法四(对称加密)：     using System.IO;     using System.Security.Cryptography;           ...           private SymmetricAlgorithm mobjCryptoService;     private string Key;     /// <summary>        /// 对称加密类的构造函数        /// </summary>        public SymmetricMethod()     {         mobjCryptoService = new RijndaelManaged();         Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";     }     /// <summary>        /// 获得密钥        /// </summary>        /// <returns>密钥</returns>        private byte[] GetLegalKey()     {         string sTemp = Key;         mobjCryptoService.GenerateKey();         byte[] bytTemp = mobjCryptoService.Key;         int KeyLength = bytTemp.Length;         if (sTemp.Length > KeyLength)             sTemp = sTemp.Substring(0, KeyLength);         else if (sTemp.Length < KeyLength)             sTemp = sTemp.PadRight(KeyLength, ' ');         return ASCIIEncoding.ASCII.GetBytes(sTemp);     }     /// <summary>        /// 获得初始向量IV        /// </summary>        /// <returns>初试向量IV</returns>        private byte[] GetLegalIV()     {         string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";         mobjCryptoService.GenerateIV();         byte[] bytTemp = mobjCryptoService.IV;         int IVLength = bytTemp.Length;         if (sTemp.Length > IVLength)             sTemp = sTemp.Substring(0, IVLength);         else if (sTemp.Length < IVLength)             sTemp = sTemp.PadRight(IVLength, ' ');         return ASCIIEncoding.ASCII.GetBytes(sTemp);     }     /// <summary>        /// 加密方法        /// </summary>        /// <param name="Source">待加密的串</param>        /// <returns>经过加密的串</returns>        public string Encrypto(string Source)     {         byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);         MemoryStream ms = new MemoryStream();         mobjCryptoService.Key = GetLegalKey();         mobjCryptoService.IV = GetLegalIV();         ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);         cs.Write(bytIn, 0, bytIn.Length);         cs.FlushFinalBlock();         ms.Close();         byte[] bytOut = ms.ToArray();         return Convert.ToBase64String(bytOut);     }     /// <summary>        /// 解密方法        /// </summary>        /// <param name="Source">待解密的串</param>        /// <returns>经过解密的串</returns>        public string Decrypto(string Source)     {         byte[] bytIn = Convert.FromBase64String(Source);         MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);         mobjCryptoService.Key = GetLegalKey();         mobjCryptoService.IV = GetLegalIV();         ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);         StreamReader sr = new StreamReader(cs);         return sr.ReadToEnd();     }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

方法五：     using System.IO;     using System.Security.Cryptography;     using System.Text;           ...           //默认密钥向量     private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };     /// <summary>     /// DES加密字符串     /// </summary>     /// <param name="encryptString">待加密的字符串</param>     /// <param name="encryptKey">加密密钥,要求为8位</param>     /// <returns>加密成功返回加密后的字符串，失败返回源串</returns>     public static string EncryptDES(string encryptString, string encryptKey)     {         try         {             byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));             byte[] rgbIV = Keys;             byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);             DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();             MemoryStream mStream = new MemoryStream();             CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);             cStream.Write(inputByteArray, 0, inputByteArray.Length);             cStream.FlushFinalBlock();             return Convert.ToBase64String(mStream.ToArray());         }         catch         {             return encryptString;         }     }           /// <summary>     /// DES解密字符串     /// </summary>     /// <param name="decryptString">待解密的字符串</param>     /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>     /// <returns>解密成功返回解密后的字符串，失败返源串</returns>     public static string DecryptDES(string decryptString, string decryptKey)     {         try         {             byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);             byte[] rgbIV = Keys;             byte[] inputByteArray = Convert.FromBase64String(decryptString);             DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();             MemoryStream mStream = new MemoryStream();             CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);             cStream.Write(inputByteArray, 0, inputByteArray.Length);             cStream.FlushFinalBlock();             return Encoding.UTF8.GetString(mStream.ToArray());         }         catch         {             return decryptString;         }     }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67

方法六(文件加密)：     using System.IO;     using System.Security.Cryptography;     using System.Text;           ...           //加密文件     private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV)     {         //Create the file streams to handle the input and output files.         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);         FileStream fout = new FileStream(outName, 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(desKey, desIV), 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();     }           //解密文件     private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV)     {         //Create the file streams to handle the input and output files.         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);         FileStream fout = new FileStream(outName, 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(desKey, desIV), 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();   }

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76

using System; using System.Security.Cryptography;//这个是处理文字编码的前提 using System.Text; using System.IO; /// <summary> /// DES加密方法 /// </summary> /// <param name="strPlain">明文</param> /// <param name="strDESKey">密钥</param> /// <param name="strDESIV">向量</param> /// <returns>密文</returns> public string DESEncrypt(string strPlain,string strDESKey,string strDESIV) {  //把密钥转换成字节数组  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);  //把向量转换成字节数组  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);  //声明1个新的DES对象  DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider();  //开辟一块内存流  MemoryStream msEncrypt=new MemoryStream();  //把内存流对象包装成加密流对象  CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);  //把加密流对象包装成写入流对象  StreamWriter swEncrypt=new StreamWriter(csEncrypt);  //写入流对象写入明文  swEncrypt.WriteLine(strPlain);  //写入流关闭  swEncrypt.Close();  //加密流关闭  csEncrypt.Close();  //把内存流转换成字节数组，内存流现在已经是密文了  byte[] bytesCipher=msEncrypt.ToArray();  //内存流关闭  msEncrypt.Close();  //把密文字节数组转换为字符串，并返回  return UnicodeEncoding.Unicode.GetString(bytesCipher); }         /// <summary> /// DES解密方法 /// </summary> /// <param name="strCipher">密文</param> /// <param name="strDESKey">密钥</param> /// <param name="strDESIV">向量</param> /// <returns>明文</returns> public string DESDecrypt(string strCipher,string strDESKey,string strDESIV) {  //把密钥转换成字节数组  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);  //把向量转换成字节数组  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);  //把密文转换成字节数组  byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher);  //声明1个新的DES对象  DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider();  //开辟一块内存流，并存放密文字节数组  MemoryStream msDecrypt=new MemoryStream(bytesCipher);  //把内存流对象包装成解密流对象  CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);  //把解密流对象包装成读出流对象  StreamReader srDecrypt=new StreamReader(csDecrypt);  //明文=读出流的读出内容  string strPlainText=srDecrypt.ReadLine();  //读出流关闭  srDecrypt.Close();  //解密流关闭  csDecrypt.Close();  //内存流关闭  msDecrypt.Close();  //返回明文  return strPlainText; }