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Old May 6th, 2005, 5:10 PM   #1
cwl157
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encryption/decryption program

I have a program that takes a file name as input and either encrypts it or decrypts it and makes a new file. it works fine except if i decrypt the file i need to have a .dec extension on the new file and if i encrypt the file i need a .enc extension on the new file. Does anyone know how i would do this? Here is the program:
import java.io.*;
public class EncryptProg
{
    static String line = "";
    public static void main(String args[])
    {
        System.out.println("1. Encrypt File.");
        System.out.println("2. Decrypt File.");
        line = EncryptProg.getInput();
        
        System.out.print("Please enter File name: ");
         String s = EncryptProg.getInput();
        EncryptProg.file(s);
    }
  //gets a single input from the user, and returns it as a String
    public static void file(String s)
    {
      try
      {
         FileReader f = new FileReader(s);
         BufferedReader input = new BufferedReader(f);
         FileOutputStream out = new FileOutputStream(s + ".enc");
         PrintWriter output = new PrintWriter(out);
         String line = input.readLine();
         while(line != null)
         {
            output.println(EncryptProg.encryption(line));
            line = input.readLine();
         }
         output.close();
      }
      catch(IOException e) {}
    }
    
  static String getInput()
  {
    java.io.InputStreamReader input = new java.io.InputStreamReader(System.in);
    java.io.BufferedReader console = new java.io.BufferedReader(input);

    try
    {
      return console.readLine();
    }
    catch(java.io.IOException e)
    {
      System.err.println("Bad NEWS!!!");
      return "";
    }
  }
  
  static String encryption(String s)
  {
      String encrypt = "";
      for(int i = 0; i < s.length(); i++)
      {
          if(s.charAt(i) == 'a')
              encrypt = encrypt + "n";
          
          else if(s.charAt(i) == 'b')
            encrypt = encrypt + "o";
          
          else if(s.charAt(i) == 'c')
            encrypt = encrypt + "p";
          
          else if(s.charAt(i) == 'd')
            encrypt = encrypt + "q";
          
          else if(s.charAt(i) == 'e')
            encrypt = encrypt + "r";
          
          else if(s.charAt(i) == 'f')
            encrypt = encrypt + "s";
          
          else if(s.charAt(i) == 'g')
            encrypt = encrypt + "t";
          
          else if(s.charAt(i) == 'h')
            encrypt = encrypt + "u";
          
          else if(s.charAt(i) == 'i')
            encrypt = encrypt + "v";
          
          else if(s.charAt(i) == 'j')
            encrypt = encrypt + "w";
          
          else if(s.charAt(i) == 'k')
            encrypt = encrypt + "x";
          
          else if(s.charAt(i) == 'l')
            encrypt = encrypt + "y";
          
          else if(s.charAt(i) == 'm')
            encrypt = encrypt + "z";
          
          else if(s.charAt(i) == 'n')
            encrypt = encrypt + "a";
          
          else if(s.charAt(i) == 'o')
            encrypt = encrypt + "b";
          
          else if(s.charAt(i) == 'p')
            encrypt = encrypt + "c";
          
          else if(s.charAt(i) == 'q')
            encrypt = encrypt + "d";
          
          else if(s.charAt(i) == 'r')
            encrypt = encrypt + "e";
          
          else if(s.charAt(i) == 's')
            encrypt = encrypt + "f";
          
          else if(s.charAt(i) == 't')
            encrypt = encrypt + "g";
          
          else if(s.charAt(i) == 'u')
            encrypt = encrypt + "h";
          
          else if(s.charAt(i) == 'v')
            encrypt = encrypt + "i";
          
          else if(s.charAt(i) == 'w')
            encrypt = encrypt + "j";
          
          else if(s.charAt(i) == 'x')
            encrypt = encrypt + "k";
          
          else if(s.charAt(i) == 'y')
            encrypt = encrypt + "l";
          
          else if(s.charAt(i) == 'z')
            encrypt = encrypt + "m";
          
           if(s.charAt(i) == 'A')
              encrypt = encrypt + "N";
          
          else if(s.charAt(i) == 'B')
            encrypt = encrypt + "O";
          
          else if(s.charAt(i) == 'C')
            encrypt = encrypt + "P";
          
          else if(s.charAt(i) == 'D')
            encrypt = encrypt + "Q";
          
          else if(s.charAt(i) == 'E')
            encrypt = encrypt + "R";
          
          else if(s.charAt(i) == 'F')
            encrypt = encrypt + "S";
          
          else if(s.charAt(i) == 'G')
            encrypt = encrypt + "T";
          
          else if(s.charAt(i) == 'H')
            encrypt = encrypt + "U";
          
          else if(s.charAt(i) == 'I')
            encrypt = encrypt + "V";
          
          else if(s.charAt(i) == 'J')
            encrypt = encrypt + "W";
          
          else if(s.charAt(i) == 'K')
            encrypt = encrypt + "X";
          
          else if(s.charAt(i) == 'L')
            encrypt = encrypt + "Y";
          
          else if(s.charAt(i) == 'M')
            encrypt = encrypt + "Z";
          
          else if(s.charAt(i) == 'N')
            encrypt = encrypt + "A";
          
          else if(s.charAt(i) == 'O')
            encrypt = encrypt + "B";
          
          else if(s.charAt(i) == 'P')
            encrypt = encrypt + "C";
          
          else if(s.charAt(i) == 'Q')
            encrypt = encrypt + "D";
          
          else if(s.charAt(i) == 'R')
            encrypt = encrypt + "E";
          
          else if(s.charAt(i) == 'S')
            encrypt = encrypt + "F";
          
          else if(s.charAt(i) == 'T')
            encrypt = encrypt + "G";
          
          else if(s.charAt(i) == 'U')
            encrypt = encrypt + "H";
          
          else if(s.charAt(i) == 'V')
            encrypt = encrypt + "I";
          
          else if(s.charAt(i) == 'W')
            encrypt = encrypt + "J";
          
          else if(s.charAt(i) == 'X')
            encrypt = encrypt + "K";
          
          else if(s.charAt(i) == 'Y')
            encrypt = encrypt + "L";
          
          else if(s.charAt(i) == 'Z')
            encrypt = encrypt + "M";
          
          else if (s.charAt(i) == ' ')
              encrypt = encrypt + " ";
      }
      
      return encrypt;
  }
}
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Old May 6th, 2005, 11:07 PM   #2
JDStud6
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2 words.....switch statement

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Old May 6th, 2005, 11:31 PM   #3
cwl157
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ive never heard of a switch statement? Maybe an example or something would help?
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Old May 7th, 2005, 1:04 AM   #4
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Ok, first, in the same class you don't have to call methods with the class name
like u did : EncryptProg.file(s); ... u just say file(s).

The same for java.io.InputStreamReader .. you imported it at the top of the program so there's no probleme, just use : InputStreamReader

Now, what you want is to split the fileName from the extension, so u could put any extension to it.
\


public class EncryptProg
{
    static String line = "";
    public static void main(String args[])
    {
        System.out.println("1. Encrypt File.");
        System.out.println("2. Decrypt File.");
        line = getInput();
        
        System.out.print("Please enter File name: ");
         String s = getInput();
        file(s,line);
public static void file(String s, String l)
    {
    	line = l;  // u need to know what the user wants
    	FileReader f = null;
    	BufferedReader input = null;
    	FileWriter out = null;
    	int i=0;
    	String[] tokens = new String[2];
    	
    	StringTokenizer tk = new StringTokenizer(s,".");
    	while(tk.hasMoreTokens()){
    		tokens[i] = tk.nextToken();
    		i++;
    	}
    	
    	String fileName = tokens[0];
    	String extention = tokens[1];

try
      {
          
          f = new FileReader(s);
          
          
          input = new BufferedReader(f);
          String line = input.readLine();
          
          if(line.equals("1")) out = new FileWriter(fileName+".dec");
          else if(line.equals("2")) out = new FileWriter(fileName+".enc");
          
    
          out = new FileWriter(fileName+".dec");
    
         PrintWriter output = new PrintWriter(out);
      
         while(line != null)
         {
            output.println(encryption(line));
            line = input.readLine();
         }
         f.close();
         out.close();
      }
      catch(IOException e) {}
    }

You should also import java.util.*; for the StringTokenizer.
Also, switch won't help. Try using 2 arrays in wich u store the letters (one for a,b,c,d .... and another one for n,o,p,q....) and then using indexes.

Hope I haven't made (m)any errors :o
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Old May 7th, 2005, 7:11 AM   #5
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And also for the encryption method instead of writing all the possible characters you should use this code:
char c = null;
         for(int i = 0; i < s.length(); i++)
         { if(s.charAt(i) == ' ')
            { encrypt += " ";}
            else
            { c = (char)(s.charAt(i) + 13);
               if((int)(c) > 123)
               { c = (char)(c - 26); }
            }
            encrypt += (String)(c);
         }
This is all you should write because the key of your encryption is 13. Thus, you add 13 to every character and then add it to the encrypted string.
The reason why youi should subtract 26 is that if the character goes above 'z' then it should start from 'a' again.
Hint for the decryption method:
      c = (char)(s.charAt(i) - 13);
               if((int)(c) < 97)
               { c = (char)(c + 26); }
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Last edited by HeX; May 7th, 2005 at 7:27 AM.
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Old May 7th, 2005, 8:11 AM   #6
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oh... i forgot that there could be also uppercases. here is version 1.1:
char c = null;
         for(int i = 0; i < s.length(); i++)
         { if(s.charAt(i) == ' ')
            { encrypt += " ";}
            else
            { if(s.charAt(i) < 'z' || s.charAt(i) > 'a')
               { c = (char)(s.charAt(i) + 13);
                  if((int)(c) > 123)
                  { c = (char)(c - 26); }
               }
               else
               { c = (char)(s.charAt(i) + 13);
                  if((int)(c) > 91)
                  { c = (char)(c - 26); }
               }
            }
            encrypt += (String)(c);
         }
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Old May 7th, 2005, 9:06 AM   #7
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ok so now it works fine when i go from an encrypted file to a decyrpted file however it doesnt work when i go from a decrypted file to an ecyrpted file it doesnt even make a new file it just writes over the original? Here is what i changed:
import java.io.*;
import java.util.*;

public class EncryptProg1
{
    static String line = "";
    public static void main(String args[])
    {
        System.out.println("1. Encrypt File.");
        System.out.println("2. Decrypt File.");
        line = getInput();
        
        System.out.print("Please enter File name: ");
         String s = getInput();
        file(s,line);
    }
static void file(String s, String l)
    {
    	line = l;  // u need to know what the user wants
    	FileReader f = null;
    	BufferedReader input = null;
    	FileWriter out = null;
    	int i=0;
    	String[] tokens = new String[2];
    	
    	StringTokenizer tk = new StringTokenizer(s,".");
    	while(tk.hasMoreTokens()){
    		tokens[i] = tk.nextToken();
    		i++;
    	}
    	
    	String fileName = tokens[0];
    	String extention = tokens[1];

try
      {
          
          f = new FileReader(s);
          
          
          input = new BufferedReader(f);
          String line = input.readLine();
          
          if(line.equals("1")) out = new FileWriter(fileName+".dec");
          else if(line.equals("2")) out = new FileWriter(fileName+".enc");
          
    
          out = new FileWriter(fileName+".dec");
    
         PrintWriter output = new PrintWriter(out);
      
         while(line != null)
         {
            output.println(encryption(line));
            line = input.readLine();
         }
         f.close();
         out.close();
      }
      catch(IOException e) {}
    }

 static String getInput()
  {
    java.io.InputStreamReader input = new java.io.InputStreamReader(System.in);
    java.io.BufferedReader console = new java.io.BufferedReader(input);

    try
    {
      return console.readLine();
    }
    catch(java.io.IOException e)
    {
      System.err.println("Bad NEWS!!!");
      return "";
    }
  }
 
  static String encryption(String s)
  {
      String encrypt = "";
      for(int i = 0; i < s.length(); i++)
      {
          if(s.charAt(i) == 'a')
              encrypt = encrypt + "n";
          
          else if(s.charAt(i) == 'b')
            encrypt = encrypt + "o";
          
          else if(s.charAt(i) == 'c')
            encrypt = encrypt + "p";
          
          else if(s.charAt(i) == 'd')
            encrypt = encrypt + "q";
          
          else if(s.charAt(i) == 'e')
            encrypt = encrypt + "r";
          
          else if(s.charAt(i) == 'f')
            encrypt = encrypt + "s";
          
          else if(s.charAt(i) == 'g')
            encrypt = encrypt + "t";
          
          else if(s.charAt(i) == 'h')
            encrypt = encrypt + "u";
          
          else if(s.charAt(i) == 'i')
            encrypt = encrypt + "v";
          
          else if(s.charAt(i) == 'j')
            encrypt = encrypt + "w";
          
          else if(s.charAt(i) == 'k')
            encrypt = encrypt + "x";
          
          else if(s.charAt(i) == 'l')
            encrypt = encrypt + "y";
          
          else if(s.charAt(i) == 'm')
            encrypt = encrypt + "z";
          
          else if(s.charAt(i) == 'n')
            encrypt = encrypt + "a";
          
          else if(s.charAt(i) == 'o')
            encrypt = encrypt + "b";
          
          else if(s.charAt(i) == 'p')
            encrypt = encrypt + "c";
          
          else if(s.charAt(i) == 'q')
            encrypt = encrypt + "d";
          
          else if(s.charAt(i) == 'r')
            encrypt = encrypt + "e";
          
          else if(s.charAt(i) == 's')
            encrypt = encrypt + "f";
          
          else if(s.charAt(i) == 't')
            encrypt = encrypt + "g";
          
          else if(s.charAt(i) == 'u')
            encrypt = encrypt + "h";
          
          else if(s.charAt(i) == 'v')
            encrypt = encrypt + "i";
          
          else if(s.charAt(i) == 'w')
            encrypt = encrypt + "j";
          
          else if(s.charAt(i) == 'x')
            encrypt = encrypt + "k";
          
          else if(s.charAt(i) == 'y')
            encrypt = encrypt + "l";
          
          else if(s.charAt(i) == 'z')
            encrypt = encrypt + "m";
          
           if(s.charAt(i) == 'A')
              encrypt = encrypt + "N";
          
          else if(s.charAt(i) == 'B')
            encrypt = encrypt + "O";
          
          else if(s.charAt(i) == 'C')
            encrypt = encrypt + "P";
          
          else if(s.charAt(i) == 'D')
            encrypt = encrypt + "Q";
          
          else if(s.charAt(i) == 'E')
            encrypt = encrypt + "R";
          
          else if(s.charAt(i) == 'F')
            encrypt = encrypt + "S";
          
          else if(s.charAt(i) == 'G')
            encrypt = encrypt + "T";
          
          else if(s.charAt(i) == 'H')
            encrypt = encrypt + "U";
          
          else if(s.charAt(i) == 'I')
            encrypt = encrypt + "V";
          
          else if(s.charAt(i) == 'J')
            encrypt = encrypt + "W";
          
          else if(s.charAt(i) == 'K')
            encrypt = encrypt + "X";
          
          else if(s.charAt(i) == 'L')
            encrypt = encrypt + "Y";
          
          else if(s.charAt(i) == 'M')
            encrypt = encrypt + "Z";
          
          else if(s.charAt(i) == 'N')
            encrypt = encrypt + "A";
          
          else if(s.charAt(i) == 'O')
            encrypt = encrypt + "B";
          
          else if(s.charAt(i) == 'P')
            encrypt = encrypt + "C";
          
          else if(s.charAt(i) == 'Q')
            encrypt = encrypt + "D";
          
          else if(s.charAt(i) == 'R')
            encrypt = encrypt + "E";
          
          else if(s.charAt(i) == 'S')
            encrypt = encrypt + "F";
          
          else if(s.charAt(i) == 'T')
            encrypt = encrypt + "G";
          
          else if(s.charAt(i) == 'U')
            encrypt = encrypt + "H";
          
          else if(s.charAt(i) == 'V')
            encrypt = encrypt + "I";
          
          else if(s.charAt(i) == 'W')
            encrypt = encrypt + "J";
          
          else if(s.charAt(i) == 'X')
            encrypt = encrypt + "K";
          
          else if(s.charAt(i) == 'Y')
            encrypt = encrypt + "L";
          
          else if(s.charAt(i) == 'Z')
            encrypt = encrypt + "M";
          
          else if (s.charAt(i) == ' ')
              encrypt = encrypt + " ";
      }
      
      return encrypt;
  }
}
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Old May 7th, 2005, 9:21 AM   #8
HeX
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Again, instead of using all these lines of code
static String encryption(String s)
  {
      String encrypt = "";
      for(int i = 0; i < s.length(); i++)
      {
          if(s.charAt(i) == 'a')
              encrypt = encrypt + "n";
          
          else if(s.charAt(i) == 'b')
            encrypt = encrypt + "o";
          
          else if(s.charAt(i) == 'c')
            encrypt = encrypt + "p";
          
          else if(s.charAt(i) == 'd')
            encrypt = encrypt + "q";
          
          else if(s.charAt(i) == 'e')
            encrypt = encrypt + "r";
          
          else if(s.charAt(i) == 'f')
            encrypt = encrypt + "s";
          
          else if(s.charAt(i) == 'g')
            encrypt = encrypt + "t";
          
          else if(s.charAt(i) == 'h')
            encrypt = encrypt + "u";
          
          else if(s.charAt(i) == 'i')
            encrypt = encrypt + "v";
          
          else if(s.charAt(i) == 'j')
            encrypt = encrypt + "w";
          
          else if(s.charAt(i) == 'k')
            encrypt = encrypt + "x";
          
          else if(s.charAt(i) == 'l')
            encrypt = encrypt + "y";
          
          else if(s.charAt(i) == 'm')
            encrypt = encrypt + "z";
          
          else if(s.charAt(i) == 'n')
            encrypt = encrypt + "a";
          
          else if(s.charAt(i) == 'o')
            encrypt = encrypt + "b";
          
          else if(s.charAt(i) == 'p')
            encrypt = encrypt + "c";
          
          else if(s.charAt(i) == 'q')
            encrypt = encrypt + "d";
          
          else if(s.charAt(i) == 'r')
            encrypt = encrypt + "e";
          
          else if(s.charAt(i) == 's')
            encrypt = encrypt + "f";
          
          else if(s.charAt(i) == 't')
            encrypt = encrypt + "g";
          
          else if(s.charAt(i) == 'u')
            encrypt = encrypt + "h";
          
          else if(s.charAt(i) == 'v')
            encrypt = encrypt + "i";
          
          else if(s.charAt(i) == 'w')
            encrypt = encrypt + "j";
          
          else if(s.charAt(i) == 'x')
            encrypt = encrypt + "k";
          
          else if(s.charAt(i) == 'y')
            encrypt = encrypt + "l";
          
          else if(s.charAt(i) == 'z')
            encrypt = encrypt + "m";
          
           if(s.charAt(i) == 'A')
              encrypt = encrypt + "N";
          
          else if(s.charAt(i) == 'B')
            encrypt = encrypt + "O";
          
          else if(s.charAt(i) == 'C')
            encrypt = encrypt + "P";
          
          else if(s.charAt(i) == 'D')
            encrypt = encrypt + "Q";
          
          else if(s.charAt(i) == 'E')
            encrypt = encrypt + "R";
          
          else if(s.charAt(i) == 'F')
            encrypt = encrypt + "S";
          
          else if(s.charAt(i) == 'G')
            encrypt = encrypt + "T";
          
          else if(s.charAt(i) == 'H')
            encrypt = encrypt + "U";
          
          else if(s.charAt(i) == 'I')
            encrypt = encrypt + "V";
          
          else if(s.charAt(i) == 'J')
            encrypt = encrypt + "W";
          
          else if(s.charAt(i) == 'K')
            encrypt = encrypt + "X";
          
          else if(s.charAt(i) == 'L')
            encrypt = encrypt + "Y";
          
          else if(s.charAt(i) == 'M')
            encrypt = encrypt + "Z";
          
          else if(s.charAt(i) == 'N')
            encrypt = encrypt + "A";
          
          else if(s.charAt(i) == 'O')
            encrypt = encrypt + "B";
          
          else if(s.charAt(i) == 'P')
            encrypt = encrypt + "C";
          
          else if(s.charAt(i) == 'Q')
            encrypt = encrypt + "D";
          
          else if(s.charAt(i) == 'R')
            encrypt = encrypt + "E";
          
          else if(s.charAt(i) == 'S')
            encrypt = encrypt + "F";
          
          else if(s.charAt(i) == 'T')
            encrypt = encrypt + "G";
          
          else if(s.charAt(i) == 'U')
            encrypt = encrypt + "H";
          
          else if(s.charAt(i) == 'V')
            encrypt = encrypt + "I";
          
          else if(s.charAt(i) == 'W')
            encrypt = encrypt + "J";
          
          else if(s.charAt(i) == 'X')
            encrypt = encrypt + "K";
          
          else if(s.charAt(i) == 'Y')
            encrypt = encrypt + "L";
          
          else if(s.charAt(i) == 'Z')
            encrypt = encrypt + "M";
          
          else if (s.charAt(i) == ' ')
              encrypt = encrypt + " ";
      }
      
      return encrypt;
  }

you could use this method for encryption:
static String encryption(String s)
  {
	String encrypt = "";
	char c = null;
	for(int i = 0; i < s.length(); i++)
        { if(s.charAt(i) == ' ')
          { encrypt += " ";}
          else
          { if(s.charAt(i) < 'z' || s.charAt(i) > 'a')
            { c = (char)(s.charAt(i) + 13);
              if((int)(c) > 123)
              { c = (char)(c - 26); }
            }
            else
            { c = (char)(s.charAt(i) + 13);
              if((int)(c) > 91)
              { c = (char)(c - 26); }
            }
          }
            encrypt += (String)(c);
        }
	return encrypt;
  }

and this one for decryption:
static String decryption(String s)
  {
	String decrypt = "";
	char c = null;
	for(int i = 0; i < s.length(); i++)
        { if(s.charAt(i) == ' ')
          { decrypt += " ";}
          else
          { if(s.charAt(i) < 'z' || s.charAt(i) > 'a')
            { c = (char)(s.charAt(i) - 13);
              if((int)(c) < 97)
              { c = (char)(c + 26); }
            }
            else
            { c = (char)(s.charAt(i) - 13);
              if((int)(c) < 65)
              { c = (char)(c + 26); }
            }
          }
            decrypt += (String)(c);
        }
	return decrypt;
  }
it is much more practical than writing all the possible characters.
hope u like it
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