X: Add 'cleanupPrivateKeyFile.sh'

cleanupPrivateKeyFile.sh

@@ -0,0 +1,20 @@
+python3 -c '
+import json
+import sys
+
+source, destination = sys.argv[1], sys.argv[2]
+
+with open(source) as f:
+    key = json.load(f)
+
+if len(key) not in (32, 64):
+    raise SystemExit(f"Unexpected key length: {len(key)}")
+
+if not all(isinstance(value, int) and 0 <= value <= 255 for value in key):
+    raise SystemExit("The file contains invalid byte values")
+
+with open(destination, "w") as f:
+    f.write(json.dumps(key, separators=(",", ":")))
+
+print(f"Created {destination} with {len(key)} bytes")
+' $1 $2