diff --git a/aps b/aps
index 07b6ab0..f503b08 100755
--- a/aps
+++ b/aps
@@ -58,6 +58,27 @@ function sources(){
         err "Sources not found, exiting!"
     fi
 }
+function sha256(){
+    sum="$(cat $@/sums)"
+    case ${shawrp##*/} in
+        openssl) set -- dgst -sha256 -r "$sum" ;;
+        sha256 set -- -r "$sum" ;;
+    esac
+    hsh=$("$shawrp" "$sum")
+}
+
+function md5(){
+    sum="$(cat $@/sums)"
+    md5sum "$sum"
+}
+function versum(){
+    $sumrest=$(cat $@/sums | cut -d'+' -f-)
+    $sumtype=$(cat $@/sums | cut -d'+' -f2)
+    case $sumtype in
+        sha256) sha256 ;;
+        md5) md5 ;;
+    esac
+}
 function runbuildsh(){
     if [ -x "${2}/${1}" ]; then
             prn "Running $1"
@@ -117,7 +138,12 @@ function pkg_local(){
     mkdir -p "${pkg_path}/payload"
     . "${pkg_path}/package"
     cd "${pkg_path}"
-    sources
+    sources || err "No sources found / failed getting sources"
+    if [ -f sums ]
+        versum "${pkg_path}"
+    else
+        wrn "No sums file found! Be careful!"
+    fi
     runbuildsh "build" "${pkg_path}"
     runbuildsh "predeploy" "${pkg_path}"
     # Old APS code from before the rewrite!