OSCam Patches

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Experimental CW-Validation Patch for OSCam Cardserver v2.25.04-11882@5b0e21fc
ECM Validation caid 1803 and 1861 CRC16/MD5 and structure ecm


Patch description:

1. Scope of action: The patch works for CAID 1803 and 1861.
2. CW verification:
3. Checks if the first 8 bytes of CW are identical to the second 8 bytes.
4. If the CW meets this condition, it considers it fake CW.
5. Reaction to the fake CW:
6. Sets the status of the ECM response to E_NOTFOUND (key not found).
7. Blocks the fake CW from being cached.
8. Interrupts further processing of the response.
9. Impact on stability:
10. Elimination of fake CW improves the stability of OSCam.
11. Reduces the risk of decoding problems and minimizes latency.
12. Integration with Cache-EX:
13. The patch also blocks the distribution of fake CW in the Cache-EX system (for CAID 1803 and 1861).
14. Place of operation:
15. Adds a call to the check_fakecw() function at a key point when handling ECM.

I also added oscam_patch-1803_1861_fakecw.zip auto patch for the original source code but I didn't test it... Maybe the patch implementation needs to be improved
I'm not good at writing patches but the file sources are patched manualy and 100% work.