[AltServer] Adds Sparkle support

Pods/Sparkle/bin/old_dsa_scripts/sign_update

@@ -0,0 +1,18 @@
+#!/bin/bash
+set -e
+set -o pipefail
+if [ "$#" -ne 2 ]; then
+  echo "Usage: $0 update_archive_file dsa_priv.pem"
+  echo "This is an old DSA signing script for deprecated DSA keys."
+  echo "Do not use this for new applications."
+  exit 1
+fi
+openssl=/usr/bin/openssl
+version=`$openssl version`
+if [[ $version =~ "OpenSSL 0.9" ]]; then
+	# pre-10.13 system: Fall back to OpenSSL DSS1 digest because it does not like the -sha1 option
+	$openssl dgst -sha1 -binary < "$1" | $openssl dgst -dss1 -sign "$2" | $openssl enc -base64
+else
+	# 10.13 and later: Use LibreSSL SHA1 digest
+	$openssl dgst -sha1 -binary < "$1" | $openssl dgst -sha1 -sign "$2" | $openssl enc -base64
+fi