Thread: MD5 hash and MimeMessage problem

Hello to all!I m new to forum so excuse me for any mistakes!!Iwan't to get MD5 hash from MimeMessage type!I use the following code to take MD5 :

//MD5
      private static String convertToHex(byte[] data) {
        StringBuilder buf = new StringBuilder();
        for (int i = 0; i < data.length; i++) {
            int halfbyte = (data[i] >>> 4) & 0x0F;
            int two_halfs = 0;
            do {
                if ((0 <= halfbyte) && (halfbyte <= 9))
                    buf.append((char) ('0' + halfbyte));
                else
                    buf.append((char) ('a' + (halfbyte - 10)));
                halfbyte = data[i] & 0x0F;
            } while(two_halfs++ < 1);
        }
        return buf.toString();
    }
 
 
       private static  String MD5(String text)    {
        MessageDigest md;
        md = MessageDigest.getInstance("MD5");
        byte[] md5hash = new byte[32];
        md.update(text.getBytes("iso-8859-1"), 0, text.length());
        md5hash = md.digest();
        return convertToHex(md5hash);

As you understand i have to convert MimeMessage into String!My problem is when MimeMessage is type Multipart every time I close my programm the next time it gives me a different MD5 hash!!!But when MimeMessage is NOT Multipart it gives me always the same MD5 hash.The code i use to convert MimeMessage to String is the following:

//This iis an example code
MimeMessage message;
String temp;
 
//i use it like this
temp=parseISToString(message.getInputStream());
 
 //Input stream to a string
    public static String parseISToString(java.io.InputStream is){
        java.io.DataInputStream din = new java.io.DataInputStream(is);
        StringBuilder sb = new StringBuilder();
        try{
        String line = null;
        while((line=din.readLine()) != null){
                sb.append(line).append("\n");
        }
        }catch(Exception ex){
            ex.getMessage();
            }finally{
        try{
                is.close();
        }catch(Exception ex){}
        }
        return sb.toString();
    }

I would be grateful if someone gave a solution to this or give me a new way to compute MD5 hash from a MimeMessage type!!Thank you...

try this. hope it helps...

    public String toMD5Hash(String str) throws NoSuchAlgorithmException{
       MessageDigest md = MessageDigest.getInstance("MD5");
       md.update(str.getBytes()); 
       byte[] mdbytes = md.digest();
 
       //convert the byte to hex format method 1
       StringBuffer sb = new StringBuffer();
       for (int i = 0; i < mdbytes.length; i++) {
         sb.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
       }
 
       return sb.toString();
    }

Thank you for your answer and happy new year!!I've tried your code but i have the same results!!So i think the poblem is not with the code of MD5 but with the input String i give...The code i use to turn the MimeMessage into String is :

//This iis an example code
MimeMessage message;
String temp;
 
//I use method .getInputString an then i convert InputString into a String with parseISToString
//Thats how i get the String for the MD5 
 
temp=parseISToString(message.getInputStream());
 
 //Input stream to a string
    public static String parseISToString(java.io.InputStream is){
        java.io.DataInputStream din = new java.io.DataInputStream(is);
        StringBuilder sb = new StringBuilder();
        try{
        String line = null;
        while((line=din.readLine()) != null){
                sb.append(line).append("\n");
        }
        }catch(Exception ex){
            ex.getMessage();
            }finally{
        try{
                is.close();
        }catch(Exception ex){}
        }
        return sb.toString();
    }

Somehow Multipart MimeMessage gives different String every time i close and reopen the program!!!Has anybody an idea why this happenning?? Thank you in advance!!

I found the problem!This is how you turn a MimeMessage to a String :

           int size;
           InputStream temp1 = null;
           String temp = new String();
            byte[] b;
           String value;
 
 
 
            size=message.getSize();
            temp1=message.getInputStream();
            b=new byte[size];
            temp1.read(b,0,size);
            value=new String(b);

The value is the String you put in MD5(value) !!!!