C #. NET encryption and decryption: AES/DES/Base64/RSA/MD5/SHA256.

Using System; using System. collections. generic; using System. linq; using System. text; using System. reflection; using System. data; using System. data. common; using System. web. script. serialization; using System. IO; using System. security. cryptography; namespace Pub. class {public static class EncryptExtensions {private static byte [] AESKeys = {0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x 77, 0x6D, 0x61, 0x6E, 0x3F}; public static string AESEncode (this string encryptString, string encryptKey) {encryptKey = encryptKey. subString (32, ""); encryptKey = encryptKey. padRight (32, ''); RijndaelManaged rijndaelProvider = new RijndaelManaged (); rijndaelProvider. key = Encoding. UTF8.GetBytes (encryptKey. substring (0, 32); rijndaelProvider. IV = AESKeys; ICryptoTransform rijndaelEncrypt = rijnd AelProvider. createEncryptor (); byte [] inputData = Encoding. UTF8.GetBytes (encryptString); byte [] encryptedData = rijndaelEncrypt. transformFinalBlock (inputData, 0, inputData. length); return Convert. toBase64String (encryptedData);} public static string AESDecode (this string decryptString, string decryptKey) {try {decryptKey = decryptKey. subString (32, ""); decryptKey = decryptKey. padRight (32 ,''); RijndaelManaged rijndaelProvider = new RijndaelManaged (); rijndaelProvider. key = Encoding. UTF8.GetBytes (decryptKey); rijndaelProvider. IV = AESKeys; ICryptoTransform rijndaelDecrypt = rijndaelProvider. createDecryptor (); byte [] inputData = Convert. fromBase64String (decryptString); byte [] decryptedData = rijndaelDecrypt. transformFinalBlock (inputData, 0, inputData. length); return Encoding. UTF8.GetStrin G (decryptedData);} catch {return string. empty ;}} private static byte [] DESKeys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; public static string DESEncode (this string encryptString, string encryptKey) {encryptKey = encryptKey. subString (8, ""); encryptKey = encryptKey. padRight (8, ''); byte [] rgbKey = Encoding. UTF8.GetBytes (encryptKey. substring (0, 8); byte [] rgbIV = DESKeys; byte [] I NputByteArray = 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. toArr Ay ();} public static string DESDecode (this string decryptString, string decryptKey) {try {decryptKey = decryptKey. subString (8, ""); decryptKey = decryptKey. padRight (8, ''); byte [] rgbKey = Encoding. UTF8.GetBytes (decryptKey); byte [] rgbIV = policeys; byte [] inputByteArray = Convert. fromBase64String (decryptString); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider (); MemoryStream mStr Eam = 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 string. empty ;}} public static string Base64Encode (this string encryptString) {byte [] encbuff = System. text. E Ncoding. UTF8.GetBytes (encryptString); return Convert. toBase64String (encbuff);} public static string Base64Decode (this string decryptString) {byte [] decbuff = Convert. fromBase64String (decryptString); return System. text. encoding. UTF8.GetString (decbuff);} public static string RSADecrypt (this string s, string key) {string result = null; if (string. isNullOrEmpty (s) throw new ArgumentException (" Empty string value cannot be encrypted. "); if (string. isNullOrEmpty (key) throw new ArgumentException ("Cannot decrypt using an empty key. please supply a decryption key. "); CspParameters cspp = new CspParameters (); cspp. keyContainerName = key; RSACryptoServiceProvider rsa = new RSACryptoServiceProvider (cspp); rsa. persistKeyInCsp = true; string [] decryptArray = s. split (new string [] {"-"}, StringS PlitOptions. none); byte [] decryptByteArray = Array. convertAll <string, byte> (decryptArray, (a => Convert. toByte (byte. parse (a, System. globalization. numberStyles. hexNumber); byte [] bytes = rsa. decrypt (decryptByteArray, true); result = System. text. UTF8Encoding. UTF8.GetString (bytes); return result;} public static string RSAEncrypt (this string s, string key) {if (string. isNullOrEmpty (s) throw new ArgumentException ("An empty string value cannot be encrypted. "); if (string. isNullOrEmpty (key) throw new ArgumentException ("Cannot encrypt using an empty key. please supply an encryption key. "); CspParameters cspp = new CspParameters (); cspp. keyContainerName = key; RSACryptoServiceProvider rsa = new RSACryptoServiceProvider (cspp); rsa. persistKeyInCsp = true; byte [] bytes = rsa. encrypt (System. text. UTF8Encoding. UTF8.GetBytes (s), true); return BitConverter. toString (bytes);} public static string MD5 (this string str) {string cl1 = str; string pwd = ""; System. security. cryptography. MD5 md5 = System. security. cryptography. MD5.Create (); // The encrypted byte array byte [] s = md5.ComputeHash (Encoding. unicode. getBytes (cl1); for (int I = 0; I <s. length; I ++) {// converts an array of the byte type to a string by using a loop. This string is a regular string formatted pwd = p Wd + s [I]. ToString ("x"); // use the hexadecimal format of the obtained string. The characters in the format are lowercase letters. If uppercase letters (X) are used, the characters in the format are uppercase letters} return pwd;} public static string MD5CSP (this string enpolicstr) {string retStr; MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider (); // create an md5 object byte [] inputBye; byte [] outputBye; // convert the string into a byte array using GB2312 encoding. inputBye = Encoding. getEncoding ("GB2312 "). getBytes (enpolicstr); outputBye = m5.ComputeHash (inputBye); retStr = System. bitConverter. toString (outputBye); retStr = retStr. replace ("-",""). toLower (); return retStr;} public static string SHA256 (this string str) {byte [] SHA256Data = Encoding. UTF8.GetBytes (str); SHA256Managed Sha256 = new SHA256Managed (); byte [] Result = Sha256.ComputeHash (SHA256Data); return Convert. toBase64String (Result); // returns a 44-byte string }}}