Des asymmetric encryption and decryption across platforms (C #, Android, iOS)

#regionCross-platform plus decryption (C # Android IOS) Public Static stringSKey ="123456"; /// <summary>        ///decryption/// </summary>        /// <param name= "Ptodecrypt" >To decrypt the Base64</param>        /// <param name= "SKey" >Key , and must be 8-bit</param>        /// <returns>decrypted String</returns>         Public Static stringDesdecrypt (stringPtodecrypt) {            //Escape Special CharactersPtodecrypt = Ptodecrypt.replace ("-","+"); Ptodecrypt= Ptodecrypt.replace ("_","/"); Ptodecrypt= Ptodecrypt.replace ("~","="); byte[] Inputbytearray =convert.frombase64string (Ptodecrypt); using(DESCryptoServiceProvider des =NewDESCryptoServiceProvider ()) {des. Key=ASCIIEncoding.ASCII.GetBytes (SKey); Des.iv=ASCIIEncoding.ASCII.GetBytes (SKey); System.IO.MemoryStream Ms=NewSystem.IO.MemoryStream (); using(CryptoStream cs =NewCryptoStream (MS, Des. CreateDecryptor (), cryptostreammode.write)) {cs. Write (Inputbytearray,0, inputbytearray.length); Cs.                    FlushFinalBlock (); Cs.                Close (); }                stringstr =Encoding.UTF8.GetString (Ms.                ToArray ()); Ms.                Close (); returnstr; }        }        /// <summary>        ///des encryption of strings/// </summary>        /// <param name= "sourcestring" >string to encrypt</param>        /// <returns>BASE64 encoded string after encryption</returns>         Public Static stringEncrypt (stringsourcestring) {            byte[] BtKey =Encoding.UTF8.GetBytes (SKey); byte[] Btiv =Encoding.UTF8.GetBytes (SKey); DESCryptoServiceProvider des=NewDESCryptoServiceProvider (); using(MemoryStream ms =NewMemoryStream ()) {                byte[] InData =Encoding.UTF8.GetBytes (sourcestring); Try                {                    using(CryptoStream cs =NewCryptoStream (MS, Des. CreateEncryptor (BtKey, Btiv), CryptoStreamMode.Write)) {cs. Write (InData,0, indata.length); Cs.                    FlushFinalBlock (); }                    returnconvert.tobase64string (Ms.                ToArray ()); }                Catch                {                    Throw; }            }        }        #endregion        //Android ---------------------------------------------------------------------------//    //decryption//Public static string decryptdonet (String message, string key)//throws Exception {//byte[] bytesrc = Base64.decode (Message.getbytes (), base64.default); //Cipher Cipher = cipher.getinstance ("des/cbc/pkcs5padding"); //Deskeyspec deskeyspec = new Deskeyspec (key.getbytes ("UTF-8")); //secretkeyfactory keyfactory = secretkeyfactory.getinstance ("DES"); //Secretkey Secretkey = Keyfactory.generatesecret (Deskeyspec); //Ivparameterspec IV = new Ivparameterspec (key.getbytes ("UTF-8")); //Cipher.init (Cipher.decrypt_mode, Secretkey, iv); //byte[] Retbyte = cipher.dofinal (BYTESRC); //return new String (Retbyte); //}        ////Encryption        //Public static string encryptasdonet (String message, string key)//throws Exception {//Cipher Cipher = cipher.getinstance ("des/cbc/pkcs5padding"); //Deskeyspec deskeyspec = new Deskeyspec (key.getbytes ("UTF-8")); //secretkeyfactory keyfactory = secretkeyfactory.getinstance ("DES"); //Secretkey Secretkey = Keyfactory.generatesecret (Deskeyspec); //Ivparameterspec IV = new Ivparameterspec (key.getbytes ("UTF-8")); //Cipher.init (Cipher.encrypt_mode, Secretkey, iv); //byte[] Encryptbyte = cipher.dofinal (Message.getbytes ()); //return new String (Base64.encode (Encryptbyte, Base64.default)); //}        /*       Ios---------------------------------------------------------------------------------------------------------- ----------//Encryption + (nsstring*) Decryptwithcontent: (nsstring*) content {char* KeyChar = (char*) [@]               Encryption key "Utf8string"; nsstring* JM = [NSString stringwithcstring:encryptwithkeyandtype ([content utf8string], Kccencrypt, KeyChar) encoding:                          Nsutf8stringencoding];       return [NSString stringwithformat:@ "%@", JM]; }//Decryption + (nsdata*) Encryptwithcontent: (nsdata*) content {nsstring* contentstr = [[NSString alloc           ] Initwithdata:content encoding:nsutf8stringencoding]; if (contentstr = = Nil | | [Contentstr isequaltostring:@ ""])           {return nil;           } contentstr= [Contentstr substringwithrange:nsmakerange (4, contentstr.length-8)];       Const char* Contentchar =[contentstr utf8string];       char* KeyChar = (char*) [@ "Encryption key" utf8string]; Const char* MIChar;           Michar = Encryptwithkeyandtype (Contentchar, Kccdecrypt, KeyChar);           if (Michar = = nil) {Michar = "";           } nsstring* zmstr = [NSString Stringwithcstring:michar encoding:nsutf8stringencoding];           if (zmstr = = nil) {ZMSTR [email protected] "";       } return [Zmstr datausingencoding:nsutf8stringencoding];           } Static const char* encryptwithkeyandtype (const char * text, ccoperation encryptoperation, char * key) {           nsstring* textstring =[[nsstring Alloc]initwithcstring:text encoding:nsutf8stringencoding];           NSLog (@ "[[item.url description] utf8string=%@", textstring);       Const void* DataIn;           size_t Datainlength; if (encryptoperation = = Kccdecrypt)//pass over is decrypt decoding {//decoding base64 nsdata* DECRYPTD ATA = [GTMBase64 decodedata:[textstring datausingencoding:nsutf8stringencoding]];//turns into utf-8 and decode dataInlength = [Decryptdata length];           DataIn = [Decryptdata bytes]; } else//encrypt {nsdata* EncryptData = [TextString Datausingencoding:nsutf8stringenc       Oding];               Datainlength = [EncryptData length];           DataIn = (const void*) [EncryptData bytes];       } cccryptorstatus Ccstatus; uint8_t* dataout = NULL; can understand the abbreviation of bit type/typedef (effectively maintain the code, such as: a person with int, a person with a long.) It is best to use typedef to define) size_t dataoutavailable = 0;       size_t is the result type returned by the operator sizeof size_t dataoutmoved = 0;           Dataoutavailable = (datainlength + kccblocksizedes) & ~ (KCCBLOCKSIZEDES-1);           Dataout = malloc (dataoutavailable* sizeof (uint8_t));           memset ((void*) dataout, XX, dataoutavailable);//Set the first 1 bytes of the memory space buffer to a value of 0//nsstring *initiv = @ "12345678";       Const void* vkey = key; Const VOID* IV = (const void*) key;           [Initiv utf8string]; Cccrypt function encryption/decryption Ccstatus = Cccrypt (encryptoperation,//encryption/decryption kccalgorithmdes,//encryption according to which standard (Des,3des,aes ....                              ) kccoptionpkcs7padding,//option block cipher algorithm (des: Add a secret 3DES for each block grouping: Three different secrets per block)                              Vkey,//key encryption and decryption keys must be consistent kcckeysizedes,//the size of the DES key (kcckeysizedes=8) IV,//optional initial vector datain,//data storage unit Datainlength                              ,//Data size (void*) dataout,//used to return the data dataoutavailable,           &dataoutmoved);           nsstring* result = nil;               if (encryptoperation = = Kccdecrypt)//encryptoperation==1 decode {//Get decrypted data, change to Utf-8 string result = [[NSString alloc] initwithdata:[nsdata datawithbytes: (const void *) Dataout length: (Nsuinteger) Datao           Utmoved] encoding:nsutf8stringencoding]; } else//encryptoperatIon==0 (in the encryption process, the well-encrypted data into base64) {//encode base64 nsdata* data = [NSData datawithbytes:               (const void *) Dataout length: (Nsuinteger) dataoutmoved];           result = [GTMBase64 stringbyencodingdata:data];       } return [result utf8string]; }//ios----------------------------------------------------------------------------------------------------- ---------------Static const char* Encryptwithkeyandtype (const char * text, ccoperation encryptoperation, char * key           ) {nsstring* textstring =[[nsstring alloc]initwithcstring:text encoding:nsutf8stringencoding];           NSLog (@ "[[item.url description] utf8string=%@", textstring);       Const void* DataIn;           size_t Datainlength; if (encryptoperation = = Kccdecrypt)//pass over is decrypt decoding {//decoding base64 nsdata* DECRYPTD ATA = [GTMBase64 decodedata:[textstring datausingencoding:nsutf8stringencoding]];//turn into utf-8 and decode datainlength = [Decryptdata length];           DataIn = [Decryptdata bytes]; } else//encrypt {nsdata* EncryptData = [TextString Datausingencoding:nsutf8stringenc       Oding];               Datainlength = [EncryptData length];           DataIn = (const void*) [EncryptData bytes];       } cccryptorstatus Ccstatus; uint8_t* dataout = NULL; can understand the abbreviation of bit type/typedef (effectively maintain the code, such as: a person with int, a person with a long.) It is best to use typedef to define) size_t dataoutavailable = 0;       size_t is the result type returned by the operator sizeof size_t dataoutmoved = 0;           Dataoutavailable = (datainlength + kccblocksizedes) & ~ (KCCBLOCKSIZEDES-1);           Dataout = malloc (dataoutavailable* sizeof (uint8_t));           memset ((void*) dataout, XX, dataoutavailable);//Set the first 1 bytes of the memory space buffer to a value of 0//nsstring *initiv = @ "12345678";       Const void* vkey = key; Const VOID* IV = (const void*) key;           [Initiv utf8string];     Cccrypt function Encryption/decryption      Ccstatus = Cccrypt (encryptoperation,//encryption/decryption kccalgorithmdes,//encryption according to which criteria (Des,3des,aes 。。。。                              ) kccoptionpkcs7padding,//option block cipher algorithm (des: Add a secret 3DES for each block grouping: Three different secrets per block)                              Vkey,//key encryption and decryption keys must be consistent kcckeysizedes,//the size of the DES key (kcckeysizedes=8) IV,//optional initial vector datain,//data storage unit Datainlength                              ,//Data size (void*) dataout,//used to return the data dataoutavailable,           &dataoutmoved);           nsstring* result = nil;               if (encryptoperation = = Kccdecrypt)//encryptoperation==1 decode {//Get decrypted data, change to Utf-8 string result = [[NSString alloc] initwithdata:[nsdata datawithbytes: (const void *) Dataout length: (Nsuinteger) Datao           Utmoved] encoding:nsutf8stringencoding];  }         Else//encryptoperation==0 (during encryption, turn the encrypted data into Base64) {//Encode base64 nsdata*               data = [NSData datawithbytes: (const void *) Dataout length: (Nsuinteger) dataoutmoved];           result = [GTMBase64 stringbyencodingdata:data];       } return [result utf8string]; } + (nsstring*) Encryptwithcontent: (nsstring*) Content type: (ccoperation) type key: (nsstring*) Akey {con       St char* Contentchar =[content utf8string];       char* KeyChar = (char*) [Akey utf8string];       Const char* Michar;           Michar = Encryptwithkeyandtype (Contentchar, type, KeyChar);       return [NSString Stringwithcstring:michar encoding:nsutf8stringencoding];        }*/

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Des asymmetric encryption and decryption across platforms (C #, Android, iOS)