how to convert from utf-8 to windows-1256

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i implement rsa encryption in java but cipher.final in decript mode doesn't accept any byte encoding expect iso-8859-1 i solve to convert utf-8 to iso-8859-1 and vice-vesa but is there
a way to convert from iso-8859-1 to windows-1256 or convert utf-8 to win-1256 or other strong
encryption and decryption technique

Posted 15-Jun-14 4:28am

Mahmoud_Gamal

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Comments

Sergey Alexandrovich Kryukov 15-Jun-14 20:50pm

It has nothing to do with "encryption".
—SA

2 solutions

Solution 1

I don't get you : a text encoding is not, in any way, a cryptographic algorithm; a text encoding represents the way the computer stores the bytes representing a text.
Changing an encoding is as trivial as

C#

byte[] originalBytes; // Here the sequence of bytes representing the UTF-8 encoded string
Encoding enc = Encoding.GetEncoding("windows-1256");
byte[] newBytes = enc.GetBytes(Encoding.UTF8.GetString(originalBytes));

More on this here: Encoding Class[^].

But what I don't get is the relation of a text-encoding with a RSA encryption. An encryption algorithm accepts an array of bytes as input; how you got this array of bytes (i.e., which text encoding you used, if you are trying to encrypt some text) is not the concern of the algorithm.

So I believe you should try to explain better what you are trying to do.

[Edit] Sorry for having missed your tag.
For Java:

Java

byte[] originalBytes; // Here the sequence of bytes representing the UTF-8 encoded string
byte[] newBytes = new String(originalBytes, "UTF8").getBytes("Windows-1256");

That does not change the fact that string encoding must not be confounded with encryption. Even if they share their first three letters, they are not related in any way.
[/Edit]

Posted 15-Jun-14 8:16am

phil.o

Updated 18-Jun-14 22:44pm

v3

Comments

Sergey Alexandrovich Kryukov 15-Jun-14 20:51pm

5ed.
—SA

Mahmoud_Gamal 16-Jun-14 5:15am

this in C# i want in java

Sergey Alexandrovich Kryukov 16-Jun-14 8:38am

Oops!
—SA

Bernhard Hiller 16-Jun-14 2:38am

I doubt that your answer is really useful: the guy talked about JAVA!
How to get the bytes from a string in Java?
How does the encryption library look like which he uses (perhaps it does really expect a text in a specific *encoding* as an input instead of a byte array)?

Mahmoud_Gamal 19-Jun-14 3:40am

yes exactly i mean it :)
thanks

phil.o 19-Jun-14 4:38am

Yes, ok, I missed the java thing.
But that does not change the fact that string encoding has nothing to do with encryption, does it?

Mahmoud_Gamal 16-Jun-14 5:17am

i use cipher rsa encryption
i get byte by memeber function getbytes in string

Sergey Alexandrovich Kryukov 16-Jun-14 8:41am

If has nothing to do with encoding. I am not sure you understand what you want.
—SA

Mahmoud_Gamal 17-Jun-14 4:42am

if i use string to decrypt it must be in format iso-8859-1 else it generate error in decoding but when i use this decryption on system support only windows-1256 encoding the encrypting
string save with data lose when i get it to decript generate error

Sergey Alexandrovich Kryukov 17-Jun-14 11:44am

...and ISO-8859-1 is not a "format". Encryption has nothing to do with encoding, it does not matter what encoding is used in encrypted data. Encrypted data is just an array of bytes and never anything else. You simply don't understand yourself what you are asking about.
—SA

Mahmoud_Gamal 18-Jun-14 2:34am

i know but i convert string to byte must be in specific format so when i get byte in format windos-1256 cannot convert into iso-8859-1 data Lose

Sergey Alexandrovich Kryukov 18-Jun-14 3:09am

No.
—SA

Mahmoud_Gamal 19-Jun-14 3:42am

No for what :)

Sergey Alexandrovich Kryukov 19-Jun-14 12:21pm

Look, all encryption is totally agnostic to formats, encoding, anything related to content. If takes array of bytes, produced another array of bytes which makes it infeasible to get original data from the encrypted data (and with public key if it is used). Decryption restores original data, the say array of bytes. Everything else is irrelevant. No formats, no encodings, nothing.
—SA

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Mahmoud_Gamal · Accepted Answer · 2014-06-18T22:01:00

i implement another encryption and decryption for this encoding i want to make it so difficult
here this code

C#

    arrc ="FKRSD$Z%T=!~#_@OJEH/Q*+}YU^-,&amp;()][:|.÷×;";
    arr  ="abcdefghijklmnopqrstuvwxyz_- @0123546798";

public String Mts_encript(String data)
{
 
   StringBuilder builder = new StringBuilder();
   Random r = new Random(25);
   int seed = GregorianCalendar.getInstance().getTime().getSeconds()%27;
   //seed = r.nextInt(9);
   for(int i=0;i<seed;i++)
   {
       //builder.append(arr.charAt(r.nextInt(25)));
           builder.append(arrc.charAt(r.nextInt(25)));

   }
   builder.append(seed);
   seed = builder.length();

  builder.append(arrc.charAt(seed));
  builder.append(arrc.charAt(seed));
  builder.append(arrc.charAt(seed));
   builder.append(data.length());
   seek = 0;
   if(data.length()>9)
       seek = 1;

   int h;
    for(int j= 0; j<data.length();j++)

    {
              for(int i = 0; i<arr.length();i++)

            {

              if(arr.charAt(i) ==data.toLowerCase().charAt(j))
              {
                   //h = ;
                builder.append(arrc.charAt(i));
                break;
              }

            }

    }
    builder.append("'");
     for(int i=0;i<seed;i++)
   {
       //builder.append(arr.charAt(r.nextInt(25)));
           builder.append(arrc.charAt(r.nextInt(25)));

   }


      return builder.toString();
}
public String  Mts_Decript(String data)
{
    data = data.toLowerCase();
      
    StringBuilder builder = new StringBuilder();
    int dataoffset = data.length();
    int i1 = 0;
    for( i1 =0;i1<data.length();i1++)
    {
        if(data.charAt(i1)>='0' &&data.charAt(i1)<='9')
        {
         
            dataoffset =Integer.parseInt( data.substring(i1,i1+1));
            if(data.charAt(i1+1)>='0' &&data.charAt(i1+1)<='9')
            dataoffset =Integer.parseInt( data.substring(i1,i1+2));
            
            
            break;
         }
    }
    ////////////////
    int length = 0;
    i1++;
    i1++;
    ///////////////////////
       for( ;i1<data.length();i1++)
    {
        if(data.charAt(i1)>='0' &&data.charAt(i1)<='9')
        {
         
           length =Integer.parseInt( data.substring(i1,i1+1));
            if(data.charAt(i1+1)>='0' &&data.charAt(i1+1)<='9')
            length =Integer.parseInt( data.substring(i1,i1+2));
            
            
            break;
         }
    }
 
    ///////////////////
    int idex = 0;
    for(int j = dataoffset+5+seek;j<data.length()-dataoffset-1;j++)
    {
      //  arrc.charAt(i)
        idex = arrc.indexOf(data.toUpperCase().charAt(j)); 
        if(idex!=-1 && builder.length()<length)
        {
          builder.append(arr.charAt(idex));
        }
        
        
    }
    return builder.toString();
}