random loop

entropy.py

@@ -1,6 +1,9 @@
+#!/usr/bin/env python3
 import cv2
 import hashlib
 import secrets
+import time
+import argparse
 
 def fetch_frame_opencv(url):
     cap = cv2.VideoCapture(url)
@@ -10,18 +13,32 @@ def fetch_frame_opencv(url):
         raise ValueError("Failed to fetch frame.")
     return frame
 
-def generate_random_numbers(frame, bit_lengths=[16, 32, 64, 128, 256, 512, 1024, 2048, 4096):
+def generate_random_numbers(frame, bit_lengths=[512]):
     _, img_encoded = cv2.imencode('.jpg', frame)
     img_bytes = img_encoded.tobytes()
     entropy = hashlib.sha256(img_bytes).digest()
-    # Use secrets.randbits directly
     return {length: secrets.randbits(length) for length in bit_lengths}
 
-url = "http://192.168.0.200/mjpg/video.mjpg"
-try:
-    frame = fetch_frame_opencv(url)
-    random_numbers = generate_random_numbers(frame)
-    for length, number in random_numbers.items():
-        print(f"{length}-bit random number: {hex(number)}")
-except Exception as e:
-    print(f"Error: {e}")
+def main():
+    parser = argparse.ArgumentParser(description="Generate random numbers from camera entropy.")
+    parser.add_argument("--url", default="http://192.168.0.200/mjpg/video.mjpg", help="Camera MJPEG stream URL")
+    parser.add_argument("--single", action="store_true", help="Run once (single mode)")
+    args = parser.parse_args()
+
+    while True:
+        try:
+            frame = fetch_frame_opencv(args.url)
+            random_numbers = generate_random_numbers(frame)
+            for number in random_numbers.values():
+                print(f"{number:x}")  # Print as hex without '0x' prefix
+        except Exception as e:
+            print(f"Error: {e}", file=sys.stderr)
+            if args.single:
+                return  # Exit after one attempt in single mode
+        if args.single:
+            break  # Exit after one iteration in single mode
+        time.sleep(1)  # Wait 1 second before fetching the next frame
+
+if __name__ == "__main__":
+    import sys
+    main()