SMS encrypted vs data coding scheme

Question

Hi all,
I have a problem in hands i can't find a "good" solution. I want to send an SMS with encrypted content and i have to send it in 7bit format. If i send it in 7bit format the phone crashes and i think it is due to the fact that encryption uses chars of the extended ascii table (all the 256 chars) am i right? So what is the solution to send an encrypted SMS in 7bit? 8bit or 16bit would work, but it is mandatory to send it using 7bit format...
One solution could be convert every char to the hexadecimal representation and send the encrypted chars in plain text but in hexadecimal representation but maybe it is not a good solution in therms of performance... Any tip?
Thanks in advance.
Regards

Answer 1

Hi Shane,
Well i also thought that should work and it was what i tried but with no success...
Look at this example i adapted from an normal Java method to use in the card:
     public  short getHexString(byte[] raw) 
          short index = 0;
          for (short i=0;i<raw.length;i++) {
            short v = (short) (raw[i] & 0xFF);
            tempBuffer[index++] = HEX_CHAR_TABLE[v >> 4];
            tempBuffer[index++] = HEX_CHAR_TABLE[v & 0xF];
            return (short)0;
       }The tempBuffer and HEX_CHAR_TABLE are both byte [].
The problem is in the tempBuffer[index++] = HEX_CHAR_TABLE[v >> 4]; line... If i remove this line i can execute the code in the card (but obviously not with the desired result), if i have that line the IDE doesn't even let me execute the application saying there are still errors to solve... I tried the cast inside the [ ], tried cast outside setting the value in another variable, etc. I don't know the reason why the operation isn't supported and if i can't use it in this simple hex converter, surely i can't use it in a Base64 encoder/decoder.. :/
You know why that operation isn't accepted?