Des Cross (C # Android IOS) Three platforms common encryption and decryption method

       #region   cross-platform plus decryption (C # Android IOS)      // public static string SKey = "12345 678 ";     // ///<summary>     // ///decryption      // // /</summary>     // ///<param name= "Ptodecrypt" > to Decrypt to base64</param>     // ///<param name= "SKey" > key, and must be 8-bit </param>     // ///<returns > decrypted string </returns>     // public static string Desdecrypt (String ptodecrypt)      / {     //     //escape special characters      //    &NBSP;PT Odecrypt = Ptodecrypt.replace ("-", "+");     /     ptodecrypt = Ptodecrypt.replace ("_", " /");     /     ptodecrypt = Ptodecrypt.replace (" ~ "," = ");     //  & nbsp  byte[] Inputbytearray = ConveRt. FromBase64String (ptodecrypt);     /     using (descryptoserviceprovider des = new descry Ptoserviceprovider ())      //     {     //        &NBS P;des. Key = ASCIIEncoding.ASCII.GetBytes (sKey);     /        &NBSP;DES.IV = ASCIIEncoding. Ascii. GetBytes (SKey);     /         system.io.memorystream ms = new System.IO.MemoryS Tream ();     /         using (CryptoStream cs = new CryptoStream (MS, Des. CreateDecryptor (), CryptoStreamMode.Write)      //         {    &NBSP ;              cs. Write (Inputbytearray, 0, Inputbytearray.length);     /            &NBSP;CS . FlushFinalBlock ();     /          &NBSP;  cs. Close ();     /         }     //        &NB sp;string str = Encoding.UTF8.GetString (MS. ToArray ());     /         ms. Close ();     /         return str;     //    &NBSP;}      // }      // ///<summary>     // /// String for DES encryption      // ///</summary>     // ///<param name= "sourcestring > Strings to be encrypted </param>     // ///<returns> encrypted BASE64 encoded strings </returns>     // public string Encrypt (String sourcestring)      //{     //  by te[] BtKey = Encoding.UTF8.GetBytes (sKey);     /  byte[] Btiv = Encoding.UTF8.GetBytes (SKey); &nbsp ;    //  &NBSP;descryptoserviceprovider des = new DESCryptoServiceProvider ();     /   using (MemoryStream ms = new MemoryStream ())      //   {     //       byte[] in Data = Encoding.UTF8.GetBytes (sourcestring);     /       try     //        {     //           using (CryptoStream cs = new CryptoStream (MS, Des. CreateEncryptor (BtKey, Btiv), CryptoStreamMode.Write)      //           {& nbsp    /               cs. Write (inData, 0, Indata.length);     /               cs. FlushFinalBlock ();     /           }      //  & nbsp        return convert.tobase64String (Ms. ToArray ());     /       }     //      &NBSP;CATCH&NB Sp    /       {     //           throw;     /       }     //   }     //}                #endregion       Android---------------------------------------------------------------------------   /   //decryption    //public static string decryptdonet (String message, string key)    //      &NBSP;T Hrows Exception {   //   byte[] bytesrc = Base64.decode (Message.getbytes (), Base64.default);   //   cipher Cipher = cipher.getinstance ("des/cbc/pkcs5padding");   //    Deskeyspec Deskeyspec = new Deskeyspec (key.getbytes ("UTF-8"));nbsp  //   secretkeyfactory keyfactory = secretkeyfactory.getinstance ("DES");   //    Secretkey Secretkey = Keyfactory.generatesecret (deskeyspec);   //   ivparameterspec IV = new IvPara Meterspec (Key.getbytes ("UTF-8"));   //   cipher.init (Cipher.decrypt_mode, Secretkey, iv);    //   byte[] Retbyte = cipher.dofinal (BYTESRC);   //   return new String (ret Byte);   //}    ////encryption    //public static string encryptasdonet (String message, Stri ng 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);   //& nbsp  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];& nbsp      nsstring *JM = [NSString stringwithcstring:encryptwithkeyandtype ([content utf8string], Kccencrypt, KeyChar) encoding:nsutf8stringencoding];        return [nsstring stringwithformat:@ "%@%@%@" , qstr,jm,hstr]; }//decryption + (NSData *) Encryptwithcontent: (NSData *) content{   NSString *contentstr = [[NSString alloc] initwithdata:content encoding:nsutf8stringencoding];         if (contentstr = = Nil | | [Contentstr isequaltostring:@ ""]) {        return nil;   }        contentstr= [Contentstr Substringw Ithrange:nsmakerange (4,contentstr.length-8)];        const char * Contentchar =[CONTENTSTR utf8string];    char * KeyChar = (char*) [@ "Encryption Key" utf8string];    const char *michar;    MICH AR = 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 decrypt decode     {       /decode base64        NSData *decryptdata = [GTMBase64 Decodedata:[textstrin G datausingencoding:nsutf8stringencoding]];//turn into Utf-8 and decode        datainlength = [Decryptdata length];        DataIn = [Decryptdata bytes];   }    Else  //encrypt  & nbsp {        nsdata* encryptData = [textstring datausingencoding:nsutf8stringencoding];    & nbsp   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.) Best defined with typedef)     size_t dataoutavailable = 0; size_t   is operator sizeof returns the result type     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 open memory space buffer to the value 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               &NBsp        kccalgorithmdes,//  encryption based on which criteria (Des,3des,aes ....                        kccoptionpkcs7padding,//  Options Group cipher Method (des: Add a secret  3des for each block: three different secrets per block)                       &NBSP ; vkey,  //key     Encryption and decryption keys must be consistent                       &N bsp;kcckeysizedes,//  DES key size (kcckeysizedes=8)                   &NBSP ;   &NBSP;IV,//  selectable initial vector                        datain ,//Data storage unit                        datainlength,//data size                         (void *) dataout,//for return data                       &NBSP;d ataoutavailable,                       &dataoutmoved), & nbsp       NSString *result = nil;        if (encryptoperation = = Kccdecrypt)//en Cryptoperation==1   decode     {       //Get decrypted data, change to Utf-8 string       & nbsp result = [[NSString alloc] initwithdata:[nsdata datawithbytes: (const void *) Dataout length: (Nsuinteger) dataoutmoved] encoding:nsutf8stringencoding];   }    Else//encryptoperation==0   (during the encryption process, Convert well-coded data to 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 through is decrypt decode     {       //decode base64        NSData *decryptdata = [G TMBase64 decodedata:[textstring datausingencoding:nsutf8stringencoding]];//turn utf-8 and decode        Datainlength = [Decryptdata length];        datain = [Decryptdata bytes];   }    Else  //encrypt    {        nsdata* encryptData = [textst Ring datausingencoding:nsutf8stringencoding];        datainlength = [EncryptData length];  & nbsp     DataIn = (const void *) [encryptData bytes];   }          &nbsp ; 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.) Best defined with typedef)     size_t dataoutavailable = 0; size_t   is operator sizeof returns the result type     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 open memory space buffer to the value 0        //nsstring *initiv = @ "12345678";    const void *vkey = key;  &nbsP const void *IV = (const void *) key; [Initiv utf8string];       //cccrypt function encryption/decryption     Ccstatus = Cccrypt ( encryptoperation,//  Encryption/decryption                        kccalgor ithmdes,//  Encryption according to which criteria (Des,3des,aes ....                        kccoptionpkcs7padding,//  Options Group cipher Method (des: Add a secret  3des for each block: three different secrets per block)                       &NBSP ; vkey,  //key     Encryption and decryption keys must be consistent                       &N bsp;kcckeysizedes,//  DES key size (kcckeysizedes=8)                   &NBSP ;   &NBSP;IV,//  selectable initial vector                        datain ,//Data storage unit                   &NBSP    datainlength,//data size                         (void) *) dataout,//for return data                       &NBSP;DATAOUTAVAILABLE,&N Bsp                      &dataoutmoved);      & nbsp NSString *result = nil;        if (encryptoperation = = kccdecrypt)//encryptoperation==1   Decode     {       //Get decrypted data, change to Utf-8 string         result = [[NSString a] Lloc] Initwithdata:[nsdata datawithbytes: (const void *) Dataout length: (nsuinteger) dataoutmoved] Encoding: nsutf8stringencoding];   }    Else//encryptoperation==0   (in the process of encryption, turn the encrypted data into base64)     {       //encode base64        NSData *data = [NSData datawithbytes: (const voi d *) dataout length: (Nsuinteger) Dataoutmoved];        result = [GTMBase64 stringbyencodingdata:data];   }    & nbsp   Return [result utf8string];    }+ (nsstring*) Encryptwithcontent: (nsstring*) content type: ( ccoperation) type key: (nsstring*) akey{    const char * Contentchar =[content utf8string];    char * key Char = (char*) [Akey utf8string];    const char *michar;    Michar = Encryptwithkeyandtype (Contentchar , type, KeyChar);    return  [nsstring Stringwithcstring:michar encoding:nsutf8stringencoding];}

des Cross (C # Android IOS) Three platforms common encryption and decryption method