Radek
44 lines
1.6 KiB
Python
44 lines
1.6 KiB
Python
#!/usr/bin/env python3
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import cv2
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import hashlib
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import secrets
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import time
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import argparse
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def fetch_frame_opencv(url):
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cap = cv2.VideoCapture(url)
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ret, frame = cap.read()
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cap.release()
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if not ret:
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raise ValueError("Failed to fetch frame.")
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return frame
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def generate_random_numbers(frame, bit_lengths):
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_, img_encoded = cv2.imencode('.jpg', frame)
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img_bytes = img_encoded.tobytes()
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entropy = hashlib.sha256(img_bytes).digest()
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return {length: secrets.randbits(length) for length in bit_lengths}
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def main():
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parser = argparse.ArgumentParser(description="Generate random numbers from camera entropy.")
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parser.add_argument("--url", default="http://192.168.0.200/mjpg/video.mjpg", help="Camera MJPEG stream URL")
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parser.add_argument("--single", type=int, default=1, help="Generate N random numbers and exit (default: 1)")
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parser.add_argument("--bit", type=int, default=256, help="Bit length of each random number (default: 256)")
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args = parser.parse_args()
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for i in range(args.single):
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try:
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frame = fetch_frame_opencv(args.url)
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random_numbers = generate_random_numbers(frame, [args.bit])
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for number in random_numbers.values():
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print(f"{number:x}") # Print as hex without '0x' prefix
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except Exception as e:
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print(f"Error: {e}", file=sys.stderr)
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return 1
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if args.single > 1 and i < args.single - 1:
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time.sleep(1) # Small delay between frames in single mode
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if __name__ == "__main__":
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import sys
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main()
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