Android Open Source - innovativeproject-meetingdataexchange M D5 Checksum

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License

The source code is released under:

MIT License

Java Source Code

package tools;
/* w  ww .j a va2s  .c  o  m*/
import java.io.FileInputStream;
import java.io.InputStream;
import java.security.MessageDigest;

public class MD5Checksum {

  public static String MD5(String md5) {
       try {
            java.security.MessageDigest md = java.security.MessageDigest.getInstance("MD5");
            byte[] array = md.digest(md5.getBytes());
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < array.length; ++i) {
              sb.append(Integer.toHexString((array[i] & 0xFF) | 0x100).substring(1,3));
           }
            return sb.toString();
        } catch (java.security.NoSuchAlgorithmException e) {
        }
        return null;
    }
  
   private static byte[] createChecksum(String filename) throws Exception {
         InputStream fis =  new FileInputStream(filename);

         byte[] buffer = new byte[1024];
         MessageDigest complete = MessageDigest.getInstance("MD5");
         int numRead;

         do {
             numRead = fis.read(buffer);
             if (numRead > 0) {
                 complete.update(buffer, 0, numRead);
             }
         } while (numRead != -1);

         fis.close();
         return complete.digest();
     }

     // see this How-to for a faster way to convert
     // a byte array to a HEX string
     public static String getMD5Checksum(String filename) throws Exception {
         byte[] b = createChecksum(filename);
         String result = "";

         for (int i=0; i < b.length; i++) {
             result += Integer.toString( ( b[i] & 0xff ) + 0x100, 16).substring( 1 );
         }
         return result;
     }
}

Java Source Code List

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