Calculate MD on PDF File

CalculateMDPdf.java

byte[] contentToSigned=getByteRangeData(pdfBytes, signature.getByteRange());

private  byte[] getByteRangeData(ByteArrayInputStream bis,int[] byteRange)    {
    int length1=byteRange[1]+byteRange[3];
    byte[] contentSigned=new byte[length1];
    bis.skip(byteRange[0]);
    bis.read(contentSigned, 0, byteRange[1]);
    bis.skip(byteRange[2]-byteRange[1]-byteRange[0]);
    bis.read(contentSigned, byteRange[1], byteRange[3]);
    bis.reset();
    return contentSigned;

}