Add sig checking for xenserver

src/xenserver.ipxe

@@ -11,30 +11,38 @@ set os Citrix XenServer
 menu ${os} 
 item --gap Stable Releases
 item 6.5.0 ${space} ${os} 6.5 (creedence)
-#item --gap Test Releases
-#item dundee/beta2 ${space} ${os} Beta 2 (dundee)
-#item dundee/beta1 ${space} ${os} Beta 1 (dundee)
 choose xs_version || goto hypervisor_menu
 goto determine_type
 
 :determine_type
 set xs_mirror downloadns.citrix.com.edgesuite.net/11419/pxe
 set xs_type release/${xs_version}
-iseq ${xs_version} dundee/beta2 && set xs_type prerelease/${xs_version} ||
-iseq ${xs_version} dundee/beta1 && set xs_type prerelease/${xs_version} ||
 goto boot_xs
 
 :boot_xs
 imgfree
-echo When prompted for the repo to install from, 
+kernel http://${xs_mirror}/${xs_type}/boot/xen dom0_max_vcpus=1-2 dom0_mem=752M,max:752M com1=115200,8n1 console=com1,vga
+module http://${xs_mirror}/${xs_type}/boot/vmlinuz xencons=hvc console=hvc0 console=tty0 install 
+module http://${xs_mirror}/${xs_type}/install.img
+echo
+echo MD5sums:
+md5sum xen vmlinuz install.img
+iseq ${img_sigs_enabled} true && goto verify_sigs || goto skip_sigs
+:verify_sigs
+echo
+echo Checking signatures...
+imgverify xen ${sigs}xenserver/11419/pxe/release/${xs_version}/boot/xen.sig || goto error
+imgverify vmlinuz ${sigs}xenserver/11419/pxe/release/${xs_version}/boot/vmlinuz.sig || goto error
+imgverify install.img ${sigs}xenserver/11419/pxe/release/${xs_version}/install.img.sig || goto error
+echo Signatures verified!
+echo
+:skip_sigs
+echo When prompted for the repo to install from,
 echo choose http and use the following repo:
 echo
 echo http://${xs_mirror}/${xs_type}
 echo
-kernel http://${xs_mirror}/${xs_type}/boot/xen dom0_max_vcpus=1-2 dom0_mem=752M,max:752M com1=115200,8n1 console=com1,vga
-module http://${xs_mirror}/${xs_type}/boot/vmlinuz xencons=hvc console=hvc0 console=tty0 install 
-module http://${xs_mirror}/${xs_type}/install.img
-prompt Please notate http repo above and press any key to continue...
+prompt Press any key to continue...
 boot
 goto hypervisor_menu