how to print encrypted string in this encrypting/decrypting code ?


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Thread: how to print encrypted string in this encrypting/decrypting code ?

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  1. #1
    Join Date
    Mar 2006
    Posts
    12

    Unhappy how to print encrypted string in this encrypting/decrypting code ?

    Hi all,
    here is full working code for encrypting and decrypting a string. It encrypts entered string and the decrypts it. It doesnt shows the encrypted string.

    http://www.java-tips.org/java-se-ti...etric-keys.html

    I just wanted to know how can i show enrypted string too.
    PLEASE HELP...!!!

    thanks,

  2. #2
    Join Date
    Apr 2006
    Posts
    28
    kindly paste the complete url. (error)

    cheers

  3. #3
    Join Date
    Mar 2006
    Posts
    12
    FILE NAME : LocalEncrypter.java


    import javax.crypto.Cipher;
    import javax.crypto.BadPaddingException;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.KeyGenerator;
    import java.security.Key;
    import java.security.InvalidKeyException;

    public class LocalEncrypter {

    private static String algorithm = "DESede";
    private static Key key = null;
    private static Cipher cipher = null;

    private static void setUp() throws Exception {
    key = KeyGenerator.getInstance(algorithm).generateKey();
    cipher = Cipher.getInstance(algorithm);
    }

    public static void main(String[] args)
    throws Exception {
    setUp();
    if (args.length !=1) {
    System.out.println(
    "USAGE: java LocalEncrypter " +
    "[String]");
    System.exit(1);
    }
    byte[] encryptionBytes = null;
    String input = args[0];
    System.out.println("Entered: " + input);
    encryptionBytes = encrypt(input);
    System.out.println(
    "Recovered: " + decrypt(encryptionBytes));
    }

    private static byte[] encrypt(String input)
    throws InvalidKeyException,
    BadPaddingException,
    IllegalBlockSizeException {
    cipher.init(Cipher.ENCRYPT_MODE, key);
    byte[] inputBytes = input.getBytes();
    return cipher.doFinal(inputBytes);
    }

    private static String decrypt(byte[] encryptionBytes)
    throws InvalidKeyException,
    BadPaddingException,
    IllegalBlockSizeException {
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] recoveredBytes =
    cipher.doFinal(encryptionBytes);
    String recovered =
    new String(recoveredBytes);
    return recovered;
    }
    }

  4. #4
    Join Date
    Apr 2006
    Posts
    28
    ok i think i have done what u had asked for.

    lemme know if it works for u.

    Code:
    import javax.crypto.Cipher;
    import javax.crypto.BadPaddingException;
    import javax.crypto.IllegalBlockSizeException;
    import javax.crypto.KeyGenerator;
    import java.security.Key;
    import java.security.InvalidKeyException;
    
    public class LocalEncrypter {
    
    private static String algorithm = "DESede";
    private static Key key = null;
    private static Cipher cipher = null;
    
    private static void setUp() throws Exception {
    key = KeyGenerator.getInstance(algorithm).generateKey(); 
    cipher = Cipher.getInstance(algorithm);
    }
    
    public static String asHex (byte buf[]) {
          StringBuffer strbuf = new StringBuffer(buf.length * 2);
          int i;
    
          for (i = 0; i < buf.length; i++) {
           if (((int) buf[i] & 0xff) < 0x10)
    	    strbuf.append("0");
    
           strbuf.append(Long.toString((int) buf[i] & 0xff, 16));
          }
    
          return strbuf.toString();
         }
    
    public static void main(String[] args) 
    throws Exception {
    setUp();
    if (args.length !=1) {
    System.out.println(
    "USAGE: java LocalEncrypter " +
    "[String]");
    System.exit(1);
    }
    byte[] encryptionBytes = null;
    String input = args[0];
    System.out.println("Entered: " + input);
    
    encryptionBytes = encrypt(input);
    System.out.println(
    "Recovered: " + decrypt(encryptionBytes));
    System.out.println("Encrypted String: " + asHex(encryptionBytes));
    }
    
    private static byte[] encrypt(String input)
    throws InvalidKeyException, 
    BadPaddingException,
    IllegalBlockSizeException {
    cipher.init(Cipher.ENCRYPT_MODE, key);
    byte[] inputBytes = input.getBytes();
    return cipher.doFinal(inputBytes);
    }
    
    private static String decrypt(byte[] encryptionBytes)
    throws InvalidKeyException, 
    BadPaddingException,
    IllegalBlockSizeException {
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] recoveredBytes = 
    cipher.doFinal(encryptionBytes);
    String recovered = 
    new String(recoveredBytes);
    return recovered;
    }
    private static String getBytes(String input) {
            return null;
        }
    
    }

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