add fingerprint-to-pin.sh

scripts/fingerprint-to-pin.sh

+#!/bin/sh
+# convert sha1 oder sha256 certificate fingerprint in hex
+# to format used by chrome://net-internals for pinning
+#     -- felix@tribut.de
+
+digest="$@"
+[ -z "$digest" ] && read digest
+
+stripped="`echo -n \"$digest\" | tr -d ': \n'`"
+length="`echo -n $stripped | wc -c`"
+
+case "$length" in
+	40)
+		type="sha1"
+		;;
+	64)
+		type="sha256"
+		;;
+	*)
+		echo "Length of digest doesn't match with any supported digest (given: $length)." >&2
+		echo "Please call me with hex digest as parameter or piped via stdin." >&2
+		exit 1
+		;;
+esac
+
+echo "$type/`echo \"$digest\" | xxd -r -p | base64`"