C #. Net encryption and decryption: AEs/DES/base64/RSA/MD5/sha256

Using system; using system. globalization; using system. io; using system. security. cryptography; using system. text; namespace pub. class {public static class encryptextensions {Private Static readonly byte [] aeskeys = {0x41, 0x72, 0x65, 0x79, 0x6f, 0x75, 0x6d, 0x79, 0x53, 0x6e, 0x6f, 0x77, 0x6d, 0x61, 0x6e, 0x3f}; Private Static readonly byte [] deskeys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef}; P Ublic static string aesencode (this string encryptstring, string encryptkey) {encryptkey = encryptkey. substring (32, ""); encryptkey = encryptkey. padright (32, ''); var rijndaelprovider = new rijndaelmanaged (); rijndaelprovider. key = encoding. utf8.getbytes (encryptkey. substring (0, 32); rijndaelprovider. IV = aeskeys; icryptotransform rijndaelencrypt = rijndaelprovider. createencryptor (); byte [] Input Data = 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, ''); var 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.getstring (decrypteddata);} catch {return string. empty ;}} Pu BLIC 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 [] inputbytearray = encoding. utf8.getbytes (encryptstring); var dcsp = new descryptoserviceprovider (); var mstream = new memorystream (); var CST Ream = new cryptostream (mstream, dcsp. createencryptor (rgbkey, rgbiv), cryptostreammode. write); cstream. write (inputbytearray, 0, inputbytearray. length); cstream. flushfinalblock (); Return convert. tobase64string (mstream. toarray ();} 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); var dcsp = new descryptoserviceprovider (); var mstream = new memorystream (); var 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 = encoding. utf8.getbytes (encryptstring); Return convert. tobase64string (encbuff);} public static string base64decode (this string decryptstring) {byte [] decbuff = convert. frombase64string (decryptstring); Return encoding. utf8.getstri Ng (decbuff);} public static string rsadecrypt (this string S, string key) {string result = NULL; If (string. isnullorempty (s) throw new argumentexception ("an empty string value cannot be encrypted. "); If (string. isnullorempty (key) throw new argumentexception ("cannot decrypt using an empty key. please supply a decryption key. "); var cspp = new cspparameters (); cspp. keycontainername = key; var RSA = New rsacryptoserviceprovider (cspp); RSA. persistkeyincsp = true; string [] decryptarray = S. split (new [] {"-"}, stringsplitoptions. none); byte [] decryptbytearray = array. convertall (decryptarray, (a => convert. tobyte (byte. parse (A, numberstyles. hexnumber); byte [] bytes = RSA. decrypt (decryptbytearray, true); Result = encoding. 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. "); var cspp = new cspparameters (); cspp. keycontainername = key; var RSA = new rsacryptoserviceprovider (cspp); RSA. persistkeyincsp = true; B Yte [] bytes = RSA. encrypt (encoding. utf8.getbytes (s), true); Return bitconverter. tostring (bytes);} public static string MD5 (this string Str) {string cl1 = STR; string Pwd = ""; 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 = PWD + 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; var M5 = new md5cryptoserviceprovider (); // create the MD5 object byte [] inputbye; byte [] outputbye; // convert the string to a byte array using gb2312 encoding. inputbye = encoding. getencoding ("gb2312 "). getbytes (enpolicstr); outputbye = m5.computehash (inputbye); retstr = bitconverter. tostring (outputbye); retstr = retstr. replace ("-",""). tolower (); Return retstr;} public static string sha256 (this string Str) {byte [] sha256data = encoding. utf8.getbytes (STR); var sha256 = new sha256managed (); byte [] result = sha256.computehash (sha256data); Return convert. tobase64string (result); // returns a 44-byte string }}}