ASP. NET encryption and decryption algorithm sharing, asp.net encryption and decryption algorithm

ASP. NET encryption and decryption algorithm sharing, asp.net encryption and decryption algorithm

# Region DES encryption and decryption // <summary> // DES encryption // </summary> // <param name = "strSource"> string to be encrypted </param >/// <param name = "key"> 32-bit Key value </param> /// <returns> encrypted string </returns> public string DESEncrypt (string strSource) {return DESEncrypt (strSource, cipher ey);} public string DESEncrypt (string strSource, byte [] key) {fig sa = Rijndael. create (); sa. key = key; sa. mode = CipherMode. ECB; sa. padding = PaddingMode. zeros; MemoryStream MS = new MemoryStream (); CryptoStream cs = new CryptoStream (MS, sa. createEncryptor (), CryptoStreamMode. write); byte [] byt = Encoding. unicode. getBytes (strSource); cs. write (byt, 0, byt. length); cs. flushFinalBlock (); cs. close (); return Convert. toBase64String (ms. toArray ());} /// <summary> // DES decryption // </summary> /// <param name = "strSource"> string to be decrypted </param> /// <param Name = "key"> 32-bit Key value </param> // <returns> decrypted string </returns> public string DESDecrypt (string strSource) {return DESDecrypt (strSource, cipher ey);} public string DESDecrypt (string strSource, byte [] key) {fig sa = Rijndael. create (); sa. key = key; sa. mode = CipherMode. ECB; sa. padding = PaddingMode. zeros; ICryptoTransform ct = sa. createDecryptor (); byte [] byt = Convert. fromBase64String (st RSource); MemoryStream MS = new MemoryStream (byt); CryptoStream cs = new CryptoStream (MS, ct, CryptoStreamMode. read); StreamReader sr = new StreamReader (cs, Encoding. unicode); return sr. readToEnd ();} # endregion # region a hash-based encryption and decryption method // <summary> /// encryption /// </summary> /// <param name = "src"> </param> // <returns> </returns> public static string EncryptStrByHash (string src) {if (src. length = 0) {Return "";} byte [] HaKey = System. text. encoding. ASCII. getBytes (src + "Test "). toCharArray (); byte [] HaData = new byte [20]; HMACSHA1 Hmac = new HMACSHA1 (HaKey); CryptoStream cs = new CryptoStream (Stream. null, Hmac, and CryptoStreamMode. write); try {cs. write (HaData, 0, HaData. length);} finally {cs. close ();} string HaResult = System. convert. toBase64String (Hmac. hash ). substring (0, 16); byte [] RiKe Y = System. text. encoding. ASCII. getBytes (HaResult. toCharArray (); byte [] RiDataBuf = System. text. encoding. ASCII. getBytes (src. toCharArray (); byte [] EncodedBytes = {}; MemoryStream MS = new MemoryStream (); RijndaelManaged rv = new RijndaelManaged (); cs = new CryptoStream (MS, rv. createEncryptor (RiKey, RiKey), CryptoStreamMode. write); try {cs. write (RiDataBuf, 0, RiDataBuf. length); cs. flushFinalBlock (); EncodedBytes = ms. toArray ();} finally {ms. close (); cs. close ();} return HaResult + System. convert. toBase64String (EncodedBytes );} /// <summary> /// decrypt /// </summary> /// <param name = "src"> </param> /// <returns> </ returns> public static string DecrypStrByHash (string src) {if (src. length <40) return ""; byte [] SrcBytes = System. convert. fromBase64String (src. substring (16); byte [] RiKey = Syste M. text. encoding. ASCII. getBytes (src. substring (0, 16 ). toCharArray (); byte [] InitialText = new byte [SrcBytes. length]; RijndaelManaged rv = new RijndaelManaged (); MemoryStream MS = new MemoryStream (SrcBytes); CryptoStream cs = new CryptoStream (MS, rv. createDecryptor (RiKey, RiKey), CryptoStreamMode. read); try {cs. read (InitialText, 0, InitialText. length);} finally {ms. close (); cs. close ();} System. T Ext. stringBuilder Result = new System. text. stringBuilder (); for (int I = 0; I <InitialText. length; ++ I) if (InitialText [I]> 0) Result. append (char) InitialText [I]); return Result. toString () ;}/// <summary> // recode the encrypted ciphertext. If the ciphertext length is greater than 16, remove the first 16 characters. If the ciphertext length is less than 16, returns an empty string /// </summary> /// <param name = "s"> </param> /// <returns> </returns> public string ReEncryptStrByHash (string s) {string e = Encrypt. encryptSt RByHash (s); return (e. Length> 16 )? E. substring (16): "") ;}# endregion # region Md5 encryption, generate 16-bit or 32-bit, the generated ciphertext is capitalized public static string Md5To16 (string str) {MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider (); string t2 = BitConverter. toString (md5.ComputeHash (UTF8Encoding. default. getBytes (str), 4, 8); t2 = t2.Replace ("-", ""); return t2 ;} //// <summary> /// MD5 32-bit encryption /// </summary> /// <param name = "str"> </param> // <returns> </returns> public static string Md5To32 (string str) {string pwd = ""; MD5 md5 = MD5.Create (); byte [] s = md5.ComputeHash (Encoding. UTF8.GetBytes (str); for (int I = 0; I <s. length; I ++) {pwd = pwd + s [I]. toString ("X");} return pwd;} # endregion # region 3DES encryption and decryption public string Encrypt3DES (string str) {// key string sKey = "wyw308 "; //// vector, can be empty string sIV = "scf521"; // construct symmetric algorithm SymmetricAlgorithm mCSP = new TripleDESCryptoServiceProvider (); ICryptoTransform ct; MemoryStream MS; CryptoStream cs; byte [] byt; mCSP. key = Convert. fromBase64String (sKey); mCSP. IV = Convert. fromBase64String (sIV); mCSP. mode = System. security. cryptography. cipherMode. ECB; mCSP. padding = System. security. cryptography. paddingMode. PKCS7; ct = mCSP. createEncryptor (mCSP. key, mCSP. IV); byt = Encoding. UTF8.GetBytes (str); MS = new MemoryStream (); cs = new CryptoStream (MS, ct, CryptoStreamMode. write); cs. write (byt, 0, byt. length); cs. flushFinalBlock (); cs. close (); return Convert. toBase64String (ms. toArray ());} /// <summary> /// 3DES encryption with the specified key and vector /// </summary> /// <param name = "str"> </param>/ // <param name = "sKey"> </param> // <param name = "sIV"> </param> // <returns> </returns> public string Encrypt3DES (string str, string sKey, string sIV) {javasricalgorithm mCSP = new TripleDESCryptoServiceProvider (); ICryptoTransform ct; MemoryStream MS; CryptoStream cs; byte [] byt; mCSP. key = Convert. fromBase64String (sKey); mCSP. IV = Convert. fromBase64String (sIV); mCSP. mode = System. security. cryptography. cipherMode. ECB; mCSP. padding = System. security. cryptography. paddingMode. PKCS7; ct = mCSP. createEncryptor (mCSP. key, mCSP. IV); byt = Encoding. UTF8.GetBytes (str); MS = new MemoryStream (); cs = new CryptoStream (MS, ct, CryptoStreamMode. write); cs. write (byt, 0, byt. length); cs. flushFinalBlock (); cs. close (); return Convert. toBase64String (ms. toArray ();} // decrypt public string Decrypt3DES (string Value) {string sKey = "wyw308"; string sIV = "scf521"; incluricalgorithm mCSP = new TripleDESCryptoServiceProvider (); ICryptoTransform ct; MemoryStream MS; CryptoStream cs; byte [] byt; mCSP. key = Convert. fromBase64String (sKey); mCSP. IV = Convert. fromBase64String (sIV); mCSP. mode = System. security. cryptography. cipherMode. ECB; mCSP. padding = System. security. cryptography. paddingMode. PKCS7; ct = mCSP. createDecryptor (mCSP. key, mCSP. IV); byt = Convert. fromBase64String (Value); MS = new MemoryStream (); cs = new CryptoStream (MS, ct, CryptoStreamMode. write); cs. write (byt, 0, byt. length); cs. flushFinalBlock (); cs. close (); return Encoding. UTF8.GetString (ms. toArray ());} /// <summary> /// 3 DES decryption with the specified key and vector /// </summary> /// <param name = "Value"> </param>/ // <param name = "sKey"> </param> // <param name = "sIV"> </param> // <returns> </returns> public string Decrypt3DES (string str, string sKey, string sIV) {javasricalgorithm mCSP = new TripleDESCryptoServiceProvider (); ICryptoTransform ct; MemoryStream MS; CryptoStream cs; byte [] byt; mCSP. key = Convert. fromBase64String (sKey); mCSP. IV = Convert. fromBase64String (sIV); mCSP. mode = System. security. cryptography. cipherMode. ECB; mCSP. padding = System. security. cryptography. paddingMode. PKCS7; ct = mCSP. createDecryptor (mCSP. key, mCSP. IV); byt = Convert. fromBase64String (str); MS = new MemoryStream (); cs = new CryptoStream (MS, ct, CryptoStreamMode. write); cs. write (byt, 0, byt. length); cs. flushFinalBlock (); cs. close (); return Encoding. UTF8.GetString (ms. toArray () ;}# endregion # region a simple encryption and decryption method. Only public static string EnCryptEnStr (string str) English is supported) // Add 1 encryption in reverse order {byte [] by = new byte [str. length]; for (int I = 0; I <= str. length-1; I ++) {by [I] = (byte) str [I] + 1) ;}str = ""; for (int I =. length-1; I> = 0; I --) {str + = (char) by [I]). toString ();} return str;} public static string DeCryptEnStr (string str) // decode {byte [] by = new byte [str. length]; for (int I = 0; I <= str. length-1; I ++) {by [I] = (byte) str [I]-1) ;}str = ""; for (int I =. length-1; I> = 0; I --) {str + = (char) by [I]). toString () ;}return str ;}# endregion # region a simple encryption and decryption method. The Chinese public static string EnCryptCnStr (string str) is supported on the basis of the previous one) {string htext = ""; // blank text for (int I = 0; I <str. length; I ++) {htext = htext + (char) (str [I] + 10-1*2);} return htext;} public static string DeCryptCnStr (string str) {string dtext = ""; for (int I = 0; I <str. length; I ++) {dtext = dtext + (char) (str [I]-10 + 1*2);} return dtext ;} # endregion # region Url address encoding and decoding // <summary> // encode the Url address /// </summary> /// <param name = "url"> </ param> // <returns> </returns> public static string UrlEncode (string url) {byte [] mByte = null; mByte = System. text. encoding. getEncoding ("GB2312 "). getBytes (url); return System. web. httpUtility. urlEncode (mByte );} /// <summary> /// decodes the Url // </summary> /// <param name = "url"> </param> /// <returns> </returns> public static string UrlDecode (string url) {return HttpUtility. urlDecode (url, System. text. encoding. getEncoding ("GB2312");} # endregion

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