How to sign incremental update package with private key?
<p>I want to sign incremental update package with my private key.</p>

<p>I have used two methods to do OTA update.</p>

<p><strong>First method</strong>, use two full update packages signed with my private key to generate incremental update package. But this method failed doing OTA update.</p>

<p><strong>Second method</strong>, use two non signed full update packages to generate incremental update package, then use my private key to sign.</p>

<p>But this method failed after I signed this incremental update package. Because the incremental update package doesn't have some document which full update package script <strong>ota_from_target_files</strong> need to pass inspections. </p>

<p>Does anyone know how to sign private key in incremental update package?  </p>

<p>Thank you</p>
