from string to byte array and then to string

Question

I'm trying to simulate the RSA encryption and decryption I want the encryption method to

Take the string
convert it into byte []
do the RSA function (as I will show in the following code)
return the byte [] as a string

what I have now and it works but with receiving and returning byte [] (not string)

   public byte[] encrypt (byte[] message){

   byte [] t= ((new BigInteger(message)).modPow(e, N)).toByteArray();

  return (t);

}

the decrypt method I want it to

receive the returned String from encrypt()
convert it into byte[]
do the RSA on the byte[] to get the original byte []

return the original string what I have up until now

    public byte [] decrypt (byte [] message) {

     byte[] data= ((new BigInteger(message)).modPow(d, N)).toByteArray();

     return data;
      }

these 2 methods work, but I need to create a byte [] in my main class and use byte[]Str.getbyte() to encrypt and new String(byte []) to encrypt .....

I want my main to deal with only strings. When I use such a decrypt(String message) code

    public String decrypt (String message) {

       byte[] data= ((new BigInteger(message.getBytes())).modPow(d, N)).toByteArray();

    return data.toString();
    }

it doesn't give me the original text as it does with decrypt(byte [] message), but it returns something like B@79f0a8b

I'm sure I'm missing something related to converting the text into byte[] and vice versa, but I'm not sure what am I missing.

I would love to hear from you.

(sorry for my English)

Look into the Object#toString() method and what it returns for array types. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 5, 2014 at 7:39

Community · Accepted Answer · 2017-05-23 11:56:55Z

1

What the reason of string values for encrypted result? You can easy convert byte[] to String and reverse it if you try to search: byte[] to String java. But is there real reason to do it?

Maybe you want something like:

public byte[] encrypt (String message);
public String decrypt (byte[] message);

Then you will manipulate with string input and will be able to get string decrypt result. But there is no reason to manipulate with encrypted data in strings, it looks like redundant operation: your string will be unreadable and algorithm work with byte[]. Just convert encrypt input and decrypt output.

edited May 23, 2017 at 11:56

CommunityBot

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answered Mar 5, 2014 at 7:46

Pavlo K.

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2 Comments

Muhannad Over a year ago

Thank you for your comment the main reason is to make the main (which is in my program an interface) deals with only strings. What I have now work perfectly with Byte[] arrays, but I was wondering why it wont work with strings.

Muhannad Over a year ago

Thank you very much. actually it is a redundant operation because I want to display the unreadable string as I said in my question I want to simulate the RSA technique. My application shows how the "plaintext" becomes an unreadable text and then goes back to the original.

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