Add tool for requesting & handling offline signatures

tools/offline-sigrequest.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+
+set -o errexit
+
+if ! `which festival > /dev/null` ; then
+    echo Please install \'festival\'!
+    exit 1
+fi
+
+function sayhash { # $1 <-- HASH ; $2 <---SIGFILEBALL
+  while read -p "Press Enter to read the hash aloud or type 'done':  " INP && [ "$INP" = "" ] ; do
+    cat $1 | (echo "(Parameter.set 'Duration_Stretch 1.5)"; \
+                echo -n '(SayText "'; \
+                sha1sum | cut -c1-40 | fold -1 | sed 's/^a$/alpha/; s/^b$/bravo/; s/^c$/charlie/; s/^d$/delta/; s/^e$/echo/; s/^f$/foxtrot/'; \
+                echo '")' ) | festival
+  done
+
+  echo 'Paste in the data from the QR code, then type Ctrl-D:'
+  cat > $2
+}
+
+function offlinesign {  # $1 <-- INPFILE ; $2 <---SIGFILE
+  echo HASH FOR SIGNING:
+  SIGFILEBALL="$2.lzma.base64"
+  #echo "(place the resulting raw binary signature in $SIGFILEBALL)"
+  sha1sum $1 
+  echo metahash for confirmation only $(sha1sum $1   |cut -d' ' -f1 | tr -d '\n' | sha1sum  | cut -c1-6) ...
+  echo
+  sayhash $1 $SIGFILEBALL
+}
+
+function oncesigned { # $1 <-- INPFILE ; $2 <--SIGFILE
+  SIGFILEBALL="$2.lzma.base64"
+  cat $SIGFILEBALL | tr -d '\r' | base64 -d | unlzma -c > $2 || exit 1
+  if ! [ -f $2 ] ; then
+    echo "Failed to find $2"'!'
+    exit 1
+  fi
+
+  if file $2 | grep -qv " data" ; then
+    echo "WARNING WARNING $2 does not look like a binary signature:"
+    echo `file $2`
+    exit 1
+  fi
+}
+
+HERE=`dirname $0`
+LEAUTO="`realpath $HERE`/../letsencrypt-auto-source/letsencrypt-auto"
+SIGFILE="$LEAUTO".sig
+offlinesign $LEAUTO $SIGFILE
+oncesigned $LEAUTO $SIGFILE