diff --git a/res/scripts/add.sh b/res/scripts/add.sh
index b63a65ea9..5a8e87217 100755
--- a/res/scripts/add.sh
+++ b/res/scripts/add.sh
@@ -64,32 +64,32 @@ URL=`printf "$3" | sed "s/\//\\\\\\\\\//g"`
 
 # Add a cached config.
 BUILDERS=`jq "[ .builders[] | select( .name | contains(\"$1\")) ]" packer-cache.json | \
-  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"$4\",/g"`
+  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"sha256:$4\",/g"`
 jq --argjson new1 "${BUILDERS}" '.builders |= .[:-1] + $new1 + .[-1:]' packer-cache.json > packer-cache.new.json
 
 # Add provisioner/builder configs.
 BUILDERS=`jq "[ .builders[] | select( .name | contains(\"$1\")) ]" generic-hyperv.json | \
-  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"$4\",/g"`
+  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"sha256:$4\",/g"`
 PROVISIONERS=`jq "[ .provisioners[] | select( .only[0] // \"no\" | contains(\"$1\")) ]" generic-hyperv.json | sed "s/$1/$2/g"`
 jq --argjson new1 "${PROVISIONERS}" --argjson new2 "${BUILDERS}" '.provisioners |= .[:-1] + $new1 + .[-1:] | .builders += $new2' generic-hyperv.json > generic-hyperv.new.json
 
 BUILDERS=`jq "[ .builders[] | select( .name | contains(\"$1\")) ]" generic-vmware.json | \
-  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"$4\",/g"`
+  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"sha256:$4\",/g"`
 PROVISIONERS=`jq "[ .provisioners[] | select( .only[0] // \"no\" | contains(\"$1\")) ]" generic-vmware.json | sed "s/$1/$2/g"`
 jq --argjson new1 "${PROVISIONERS}" --argjson new2 "${BUILDERS}" '.provisioners |= .[:-1] + $new1 + .[-1:] | .builders += $new2' generic-vmware.json > generic-vmware.new.json
 
 BUILDERS=`jq "[ .builders[] | select( .name | contains(\"$1\")) ]" generic-libvirt.json | \
-  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"$4\",/g"`
+  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"sha256:$4\",/g"`
 PROVISIONERS=`jq "[ .provisioners[] | select( .only[0] // \"no\" | contains(\"$1\")) ]" generic-libvirt.json | sed "s/$1/$2/g"`
 jq --argjson new1 "${PROVISIONERS}" --argjson new2 "${BUILDERS}" '.provisioners |= .[:-1] + $new1 + .[-1:] | .builders += $new2' generic-libvirt.json > generic-libvirt.new.json
 
 BUILDERS=`jq "[ .builders[] | select( .name | contains(\"$1\")) ]" generic-parallels.json | \
-  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"$4\",/g"`
+  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"sha256:$4\",/g"`
 PROVISIONERS=`jq "[ .provisioners[] | select( .only[0] // \"no\" | contains(\"$1\")) ]" generic-parallels.json | sed "s/$1/$2/g"`
 jq --argjson new1 "${PROVISIONERS}" --argjson new2 "${BUILDERS}" '.provisioners |= .[:-1] + $new1 + .[-1:] | .builders += $new2' generic-parallels.json > generic-parallels.new.json
 
 BUILDERS=`jq "[ .builders[] | select( .name | contains(\"$1\")) ]" generic-virtualbox.json | \
-  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"$4\",/g"`
+  sed "s/$1/$2/g" | sed "s/\"iso_url\": \".*\",/\"iso_url\": \"$URL\",/g" | sed "s/\"iso_checksum\": \".*\",/\"iso_checksum\": \"sha256:$4\",/g"`
 PROVISIONERS=`jq "[ .provisioners[] | select( .only[0] // \"no\" | contains(\"$1\")) ]" generic-virtualbox.json | sed "s/$1/$2/g"`
 jq --argjson new1 "${PROVISIONERS}" --argjson new2 "${BUILDERS}" '.provisioners |= .[:-1] + $new1 + .[-1:] | .builders += $new2' generic-virtualbox.json > generic-virtualbox.new.json
 
diff --git a/robox.sh b/robox.sh
index 42ca3fde2..826a82813 100755
--- a/robox.sh
+++ b/robox.sh
@@ -72,7 +72,7 @@ DYNAMICURLS="http://cdimage.ubuntu.com/ubuntu-server/daily/current/disco-server-
 
 # Collect the list of ISO urls.
 ISOURLS=(`grep -E "iso_url|guest_additions_url" $FILES | grep -Ev "$DYNAMICURLS" | awk -F'"' '{print $4}'`)
-ISOSUMS=(`grep -E "iso_checksum|guest_additions_sha256" $FILES | grep -Ev "iso_checksum_type|iso_checksum_url" | awk -F'"' '{print $4}'`)
+ISOSUMS=(`grep -E "iso_checksum|guest_additions_sha256" $FILES | awk -F'"' '{print $4}' | awk -F':' '{print $2}'`)
 UNIQURLS=(`grep -E "iso_url|guest_additions_url" $FILES | awk -F'"' '{print $4}' | sort | uniq`)
 
 # Collect the list of box names.
@@ -298,7 +298,7 @@ function iso() {
 
     # Replace the existing ISO and hash values with the update values.
     sed --in-place "s/$ISO_URL/$URL/g" $FILES
-    sed --in-place "s/$ISO_CHECKSUM/$SHA/g" $FILES
+    sed --in-place "s/$ISO_CHECKSUM/sha256:$SHA/g" $FILES
 
 
   elif [ "$1" == "arch" ]; then
@@ -333,7 +333,7 @@ function iso() {
 
     # Replace the existing ISO and hash values with the update values.
     sed --in-place "s/$ISO_URL/$URL/g" $FILES
-    sed --in-place "s/$ISO_CHECKSUM/$SHA/g" $FILES
+    sed --in-place "s/$ISO_CHECKSUM/sha256:$SHA/g" $FILES
 
   fi