Converting a byte array or hex string  into DES key

i required to covert a hex represented of DES key into key object for cryptography operation to performed ...
can you help me to find out how to convert a hex representaion of key int DES key object

hi friend,
I think the key size is more than the required size. For DES algorithm, the key size is 64 bit long.But the code u have given has more than 64 bit, because of which this exception has been raised.
Reduce the key value to 64bit and try. If it doesnt work,try the code given below .I think it might be helpful for u
import javax.crypto.*;
import javax.crypto.spec.*;
public class Cryption
     public byte[] encrypt(byte[] keyData,byte[] clearMessage)
          try
               SecretKeySpec sks = new SecretKeySpec(keyData,"DES");
               Cipher c = Cipher.getInstance ("DES");
               c.init(Cipher.ENCRYPT_MODE,sks);
               byte[] encryptedMessage = c.doFinal(clearMessage);
               return encryptedMessage;
          catch(Exception e)
               e.printStackTrace();
          return null;
     public byte[] decrypt(byte[] keyData,byte[] cipherMessage)
          try
               SecretKeySpec sks = new SecretKeySpec(keyData,"DES");
               Cipher c = Cipher.getInstance ("DES");
               c.init(Cipher.DECRYPT_MODE,sks);
               byte[] decryptedMessage = c.doFinal(cipherMessage);
               return decryptedMessage;
          catch(Exception e)
               e.printStackTrace();
          return null;
     public static void main(String[] args)
          String keyString = "ABCDEF12";
          byte keyValue[] = keyString.getBytes();
          Cryption encryption = new Cryption();
          String Message = "Hello Welcome to world of Cryptography";
          System.out.println("Key Value (represented in HEX form): "+keyString);
          System.out.println("Key Value (represented in byte array form): "+keyValue);
          System.out.println("Original Message : "+Message);
          byte[] encryptedMessage = encryption.encrypt(keyValue,Message.getBytes());
          System.out.println("Encrypted Message : "+new String(encryptedMessage));
          Cryption decryption = new Cryption();
          byte[] decryptedMessage = decryption.decrypt(keyValue,encryptedMessage);
          System.out.println("Decrypted Message : "+new String(decryptedMessage));
output :
Key Value (represented in HEX form): ABCDEF12
Key Value (represented in byte array form): [[email protected]
Original Message : Hello Welcome to world of Cryptography
Encrypted Message : "O3�?�M�,����������,�]�3�����R�?>C$
Decrypted Message : Hello Welcome to world of Cryptography
whenever u use any algorithm, first findout the key size or range that algorithm supports. It is very important
regards,
Deepa Raghuraman

Similar Messages

  • Convertion of byte array in UTF-8 to GSM character set.

    I want to convert byte array in UTF-8 to GSM character set. Please advice How can I do that?

    String s = new String(byteArrayInUTF8,"utf-8");This will convert your byte array to a Java UNICODE UTF-16 encoded String on the assumption that the byte array represents characters encoded as utf-8.
    I don't understand what GSM characters are so someone else will have to help you with the second part.

  • Adding byte arrays of hex numbers

    Hi all,
    Im having a lot of trouble adding an array of bytes containg a hexidecimal number to another in java. Here is an example of what I want to do (adding 2 byte arrays of hex):
    00 00 00 FF
    00 00 00 FF
    00 00 01 FE
    Here is what I have so far:
    byte[] ary1 = new byte[]{(byte)0x00, (byte)0x00, (byte)0x00, (byte)0xFF}; byte[] ary2 = new byte[]{(byte)0x00, (byte)0x00, (byte)0x00, (byte)0xFF};
    for (int i = 0; i < ary1.length; i++) {
        ary1[i] += ary2;
    This comes out with 00 00 00 FE (using util methods to make the byte array readable as hex). Which is almost right, obviously im missing the overflow. I have no idea how I could detect this in Java, extensive googling has turned up nothing.
    Or maybe there is another simpler way to go about this?
    please help!

    Add the values into an int variable, put the result (cast to byte) into the target array and use (result >> 8) as overflow to add to the next iteration. (Possibly check that overflow at the end of the loop).

  • How Convert a Byte array to a image format

    Hi,
    How to convert a Byte array to an image format....I shall be more clear what i want...See i recieve a Byte array fom server this Byte array before recieveing at my end it was converted from an image/text format into a Byte array and is sent from server and, I recieve this Byte array now I have to convert this Byte array into their respective image....please tell me how to convert a Byte array to a image ......... Kindly explain clearly as i am new to Java......
    Thanking You.

    Note: This thread was originally posted in the [New To Java|http://forums.sun.com/forum.jspa?forumID=54] forum, but moved to this forum for closer topic alignment.

  • Boolean Array to Hex String - LabVIEW Supplementary Data Conversion Library in version 12 please

    Hello,
    I would like to use the Boolean Array to Hex String.vi in LabVIEW Supplementary Data Conversion Library at http://zone.ni.com/devzone/cda/epd/p/id/3727
    But it is version 4. Can someone give me the library in version 12? Attached herewith.
    Attachments:
    cnvrsion.zip ‏38 KB

    Mass compiled in 8.2.1, which you can open with 2012.
    There are only two ways to tell somebody thanks: Kudos and Marked Solutions
    Unofficial Forum Rules and Guidelines
    Attachments:
    convrzun.llb ‏65 KB

  • Convert HEX String into HEX Array

    Hi!
    Probably a silly question, but I am looking for a way to convert a ROM ID number such as "5E03C21000BA" into an short hexadecimal array.
    The way to do this in C would probably be
    char[17] str_romID = "5E03C21000BA";
    uchar[8] romID;
    sscanf(str_romID, "%02X%02X%02X%02X%02X%02X%02X%02X",
    &romID[0], &romID[1], &romID[2], &romID[3],
    &romID[4], &romID[5], &romID[6], &romID[7]);
    but I can't seem to find a way to do this in LabVIEW. I would be very grateful if you could help me out with a sample program. Thanks ever so much!
    Stefan

    Hello Blondchen,
    I have attached a picture to my last explanation. This example doesn't take care of strings with an uneven number of chars!
    My array has only 6 numbers as you only gave a string with 12 chars... That's what I asked before: how should we know where to split your string to the single numbers? Normally I would take 2 chars to form a byte (as I did in the example). If you give me 16 chars I give you 8 bytes...
    I also think your C byte array will be an U8 array in LabView. If you REALLY need I8 numbers you can change the default type of the "hex to string" or cast to I8 (advanced->data manipulation->type cast) after the conversion.
    Best regards,
    GerdW
    Best regards,
    GerdW
    CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
    Kudos are welcome
    Attachments:
    ConvertHexHex.png ‏13 KB

  • Converting a byte array into int

    Here's my problem, I've read my data from a server into a byte array.
    the array is 12 elements in length representing three int variables.
    int flag;
    int query_a;
    int query_b;
    here's what i receive:
    0 0 0 0 34 0 0 -2 21 0 0 0
    how do i convert these into the int values i need.
    i know the first four are for flag = 0, but how does it convert?
    0000 = 0 for each byte
    00000000 00000000 00000000 00000000 = 0 for each bit?
    or is there a method to convert from a byte to int?

    Look at the ByteBuffer class (part of 1.4.1) - before that, you would have had to manually build your integers using left shift and & operator (not that big of a deal, really).
    Be sure you know the "Endian"-ness of the platform you are reading data from though, otherwise, your ints will not be what you expect!
    - K

  • How to save Byte Array of raw data into JPEG image.

    Hello!
    I have a image and I stored its data as byte array as
    bimage = bitmap1.getRawData();
    now I have Byte[] bimage, I want to save it as .jpeg image.
    and show that image..............

    the short way is this:
    ImageIO.write(bimage, "jpeg", new File("image.jpg"));
    Where you use the original Image object... but it has to be a java.awt.image.RenderedImage (which a java.awt.image.BufferedImage is). So this method would come in handy.
         public static BufferedImage getBufferedImage(Image img) {
              // if the image is already a BufferedImage, cast and return it
              if((img instanceof BufferedImage) && background == null) {
                   return (BufferedImage)img;
              // otherwise, create a new BufferedImage and draw the original
              // image on it
              int w = img.getWidth(null);
              int h = img.getHeight(null);
              BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
              Graphics2D g2d = bi.createGraphics();
              g2d.drawImage(img, 0, 0, w, h, null);
              g2d.dispose();
              return bi;
         }If the byte array you have is raw image data, then you can look at the javax.imageio package and see what you can do with those classes.

  • How to generate a unique 8 byte number for a String in DES

    Hi All,
    Is there any way to generate a unique 8 byte number representation of String?
    I know it can be done with DES encryption (while MD5 gives 16 bytes number). My requirement is:
    Every time a String is passed - my static method should return the same unique number - all the time.
    i.e A String "AAAAAA" will return same unique number all the time. How can I achieve this (8 byte number) by DES Encryption or any other encryption?
    Thanking all in advance.

    Thanks for your reply. Won't there be any loss of data if I consider only first 8 bytes? Will Integrity be maintained.?
    In some cases my Strings can be unusually long - having length of 400 to 500.
    I want 8 bytes as I want to map the number with MySQL bigint field.

  • How to convert  Wav file  in to byte array an vise vers into RMS???????????

    hi Constantinos Loizou
    i m having same problem which u were facing in last month.
    my problem i have to save .WAV file into RMS and then retreive it from RMS.
    my Code is
    Read From RMS
    RecordStore rsUser = RecordStore.openRecordStore(file,true);
    if(rsUser.getNumRecords() > 0)
    try {
    byte[] byusrinfo = rsUser.getRecord(1);
    InputStream in = new ByteArrayInputStream(byusrinfo,0,byusrinfo.length);
    p = Manager.createPlayer(in,"audio/x-wav");
    p.start();
    return true;
    catch(Exception ex) {
    ex.printStackTrace();
    return false;
    rsUser.closeRecordStore();
    catch(Exception ex) {
    ex.printStackTrace();
    return false;
    Write in RMS
    try {
    RecordStore rsUser = RecordStore.openRecordStore(file,true);
    int idata = is.available();
    byte[] exdata = new byte[idata];
    is.read(exdata);
    if(rsUser.getNumRecords() > 0) {
    rsUser.setRecord(1,exdata,0,exdata.length);
    else {
    rsUser.addRecord(exdata,0,exdata.length);
    rsUser.closeRecordStore();
    catch(Exception ex) {
    ex.printStackTrace ();
    now i have the file successfully when i retrieve it from RMS and p.reliaze() give me exception
    javax.microedition.media.MediaException: Failed to realize Player: Malformed wave media: expected 'RIFF'
    have u able to solve it. if yes then pls give me solution. or give other solution if this soution is not good
    regardz
    Hassan Mushtaq

    Well, I'm not going to give you your code on a silver platter. You'll need to put some effort in it yourself.
    So look at that available() method yourself an see if you can improve on that. Look at the api docs, there is loads of information there, and often it will give you pointers on why things are not working.

  • Converting Image to Byte Array and then to String

    Hi All...
    Can anyone please help me. I have got a problem while converting a Byte array of BufferedImage to String.
    This is my code, First i convert a BufferedImage to a byte array using ImageIO.wirte
    public String dirName="C:\\image";
    ByteArrayOutputStream baos=new ByteArrayOutputStream(1000);
    BufferedImage img=ImageIO.read(new File(dirName,"red.jpg"));
    ImageIO.write(img, "jpg", baos);
    baos.flush();
    byte[] resultimage=baos.toByteArray();
    baos.close();
    Then i tried to convert this byte array to a string
    String str=new String(resultimage);
    byte[] b=str.getBytes();
    This much worked fine. But when i reversed this process to re-create the image from that string. i found the image distroted.
    BufferedImage imag=ImageIO.read(new ByteArrayInputStream(b));
    ImageIO.write(imag, "jpg", new File(dirName,"snap.jpg"));
    I got this snap.jpg as distroted.
    Please help me i have to convert the image to a string and again i have to re-create the image from that string.

    To conver the bytearray to string use base64.encoding
    String base64String= Base64.encode(baos.toByteArray());
    To convert back use Base64.decode;
    byte[] bytearray = Base64.decode(base64String);
    BufferedImage imag=ImageIO.read(bytearray);

  • Converting ASCII text (byte array ending in null) to a String

    Hi all,
    I am trying to convert a null terminated ascii string stored in a byte array to a java String. When I pass the byte array to the String constructor it
    does not detect/interpret the null as a terminator for the ascii string. Is this something I have to manually program in? ie Check for where the null is and then
    pass that subarray of everything before the null to the String constructor?
    example of problem
    //               A   B  C   D   null   F   (note F is junk in the array, and should be ignored since it is after null)
    byte[] asciiArray = { 65, 66, 67, 68, 0,  70 };
    System.out.println(new String(asciiArray, "UTF-8"));
    //this prints ABCD"sqare icon"F

    Why do you expect the null character to terminate the string? If you come from a C or C++ background, you need to understand that java.lang.String is not just a mere character array. It's a full-fledged Java object that knows its length without having any need for null terminator. So Ascii 0 is just another character for String object. To achieve what you want to do, you have to manually loop through the byte array and stop when you encounter a null character.

  • How to put a String into a byte array

    How can i put a String into a byte array byte[]. So that i can send it to the serial port for output to an LCD display. Cheers David

    javadocs for String
    getBytes
    public byte[] getBytes()
    Encodes this String into a sequence of bytes using the platform's default charset, storing the result into a new byte array.
    Returns:
    The resultant byte arraySince:
    JDK1.1

  • Convert a byte/Byte - HEX STRING ?

    Hi ,
    My Problem is , I want to convert a byte/Byte value to hex string. If there is any way to convert bytes to hex strings then please tell me.
    please help me.

    Integer.toHexString(byteValue);
    http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Integer.html

  • How do I read directly from file into byte array

    I am reading an image from a file into a BuffertedImage then writing it out again into an array of bytes which I store and use later on in the program. Currently Im doing this in two stages is there a way to do it it one go to speed things up.
    try
                //Read File Contents into a Buffered Image
                /** BUG 4705399: There was a problem with some jpegs taking ages to load turns out to be
                 * (at least partially) a problem with non-standard colour models, which is why we set the
                 * destination colour model. The side effect should be standard colour model in subsequent reading.
                BufferedImage bi = null;
                ImageReader ir = null;
                ImageInputStream stream =  ImageIO.createImageInputStream(new File(path));
                final Iterator i = ImageIO.getImageReaders(stream);
                if (i.hasNext())
                    ir = (ImageReader) i.next();
                    ir.setInput(stream);
                    ImageReadParam param = ir.getDefaultReadParam();
                    ImageTypeSpecifier typeToUse = null;
                    for (Iterator i2 = ir.getImageTypes(0); i2.hasNext();)
                        ImageTypeSpecifier type = (ImageTypeSpecifier) i2.next();
                        if (type.getColorModel().getColorSpace().isCS_sRGB())
                            typeToUse = type;
                    if (typeToUse != null)
                        param.setDestinationType(typeToUse);
                    bi = ir.read(0, param);
                    //ir.dispose(); seem to reference this in write
                    //stream.close();
                //Write Buffered Image to Byte ArrayOutput Stream
                if (bi != null)
                    //Convert to byte array
                    final ByteArrayOutputStream output = new ByteArrayOutputStream();
                    //Try and find corresponding writer for reader but if not possible
                    //we use JPG (which is always installed) instead.
                    final ImageWriter iw = ImageIO.getImageWriter(ir);
                    if (iw != null)
                        if (ImageIO.write(bi, ir.getFormatName(), new DataOutputStream(output)) == false)
                            MainWindow.logger.warning("Unable to Write Image");
                    else
                        if (ImageIO.write(bi, "JPG", new DataOutputStream(output)) == false)
                            MainWindow.logger.warning("Warning Unable to Write Image as JPEG");
                    //Add to image list
                    final byte[] imageData = output.toByteArray();
                    Images.addImage(imageData);
                  

    If you don't need to manipulate the image in any way I would suggest you just read the image file directly into a byte array (without ImageReader) and then create the BufferedImage from that byte array.

Maybe you are looking for

  • CS5 InDesign won't install on MacBook Pro

    Hi, I've attempted 2x now to install InDesign via my CS5 installation discs on my MacBook Pro, and everything except InDesign loads each time. I get this error message: Exit Code: 7 -------------------------------------- Summary ---------------------

  • Multiple Submit buttons on one form

    I'm developing an application that will have 4 buttons at the bottom of the form to do various things with the form information. One of the buttons will link to a separate web page for confirmation of the action. I tried to set a global variable and

  • How to change security so its locked but can fill out forms and then save?

    Hey there, i want to know how to make a PDF document locked (so you can't change anything) but you can fill out the forms and them save then with the edits in the forms done? Is there anyway to do this? Or do i need to take some settings off. So far

  • Unable to start/stop Personal Web Sharing

    I do some web development, so I tried making the necessary changes to run PHP files via localhost. I followed various online articles by making some changes to the httpd.conf file, and then downloading MySQL and a later version of PHP (5.0). Since in

  • RSA1 cube role

    I need to give a user a new role so that they can just view the contents of a specific cube within RSA1.  Say the cube is called ztest what entries do I need to enter in the following within PFCG so they can just see this cube Cross-application Autho


HashFlare