title: Specification of signed binaries on OS X
body: <p>I'm looking for a detailed description of the internal format of signed binaries on OS X. For Windows executable files Microsoft has published the <a href="http://download.microsoft.com/download/9/c/5/9c5b2167-8017-4bae-9fde-d599bac8184a/authenticode_pe.docx" rel="noreferrer">specification</a> but I'm unable to find the equivalent documentation for OS X applications (Mach-O binaries). The <a href="https://developer.apple.com/library/mac/#documentation/Darwin/Reference/Manpages/man1/codesign.1.html" rel="noreferrer">man page</a> for the <code>codesign</code> command doesn't describe how the files are modified.</p>
  
  <p>Anyone know where to find this information? </p>