Adds sri-hash

diff --git a/sri-hash b/sri-hash
new file mode 100755 (executable)
index 0000000..5979c39
--- /dev/null
+++ b/sri-hash
@@ -0,0 +1,34 @@
+#/bin/sh
+#
+# SRI Hash Generator
+#
+
+# Parameters
+BASENAME="`basename $0`"
+URI="$1"
+
+# Check
+if [ -z "$URI" ]; then
+  echo "usage: $BASENAME <file-or-url>"
+  exit 1
+fi
+
+# Get file
+if echo "$URI" | grep -q '^http'; then
+  echo "downloading $URI and generating hash..."
+  HASH="`curl $URI | openssl dgst -sha384 -binary | openssl base64 -A`"
+  echo ""
+else
+  if [ -e "$URI" ]; then
+    # See https://www.srihash.org/
+    HASH="`openssl dgst -sha384 -binary $URI | openssl base64 -A`"
+  else
+    echo "file not found: $URI"
+    exit 1
+  fi
+fi
+
+# Generate
+cat <<EOF
+<script src="$URI" integrity="sha384-$HASH" crossorigin="anonymous"></script>
+EOF