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Diffstat (limited to 'research/executables/claude-ai-slop/mel_checksum_cracker.py')
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diff --git a/research/executables/claude-ai-slop/mel_checksum_cracker.py b/research/executables/claude-ai-slop/mel_checksum_cracker.py new file mode 100644 index 0000000..c851742 --- /dev/null +++ b/research/executables/claude-ai-slop/mel_checksum_cracker.py @@ -0,0 +1,319 @@ +#!/usr/bin/env python3 +""" +MEL Checksum Cracker - Final comprehensive tool +Based on analysis showing sum-sequence is constant but checksum follows different pattern +""" + +import sys +import struct + +def parse_hex(hex_str): + """Parse hex string to bytes""" + return [int(hex_str[i:i+2], 16) for i in range(0, len(hex_str), 2)] + +def calculate_mel_checksum(payload_bytes, sequence=None): + """ + Calculate MEL checksum based on discovered patterns + This function will be updated as we discover the actual algorithm + """ + if sequence is None: + # Try to extract sequence from payload if it's a full packet + if len(payload_bytes) >= 8: + sequence = payload_bytes[7] + else: + sequence = 0 + + # Calculate payload sum (excluding checksum bytes) + if len(payload_bytes) > 31: # Full packet + payload_sum = sum(payload_bytes[:-2]) + else: # Just payload + payload_sum = sum(payload_bytes) + + # Test various algorithms based on our analysis + algorithms = { + 'simple_sum': payload_sum & 0xFFFF, + 'sum_minus_seq': (payload_sum - sequence) & 0xFFFF, + 'sum_plus_seq': (payload_sum + sequence) & 0xFFFF, + 'twos_complement': (~payload_sum + 1) & 0xFFFF, + 'ones_complement': (~payload_sum) & 0xFFFF, + 'constant_minus_sum': (0x10000 - payload_sum) & 0xFFFF, + 'sum_with_carry': payload_sum + (payload_sum >> 16), + } + + return algorithms + +def analyze_pattern_discovery(filename): + """Discover the actual checksum pattern""" + print(f"Pattern Discovery Analysis for {filename}") + print("=" * 60) + + with open(filename, 'r') as f: + lines = [line.strip() for line in f if line.strip()] + + # Analyze first 20 entries to find the pattern + entries = [] + for i, line in enumerate(lines[:20]): + bytes_data = parse_hex(line) + payload = bytes_data[:-2] + checksum = bytes_data[-2] | (bytes_data[-1] << 8) # Little endian + sequence = bytes_data[7] if len(bytes_data) > 7 else 0 + payload_sum = sum(payload) + + entries.append({ + 'index': i, + 'sequence': sequence, + 'checksum': checksum, + 'payload_sum': payload_sum, + 'payload': payload, + 'hex': line + }) + + # Print analysis table + print("Entry | Seq | Checksum | PayloadSum | Sum-Seq | Patterns") + print("------|-----|----------|------------|---------|----------") + + base_constant = None + for entry in entries: + seq = entry['sequence'] + check = entry['checksum'] + psum = entry['payload_sum'] + sum_minus_seq = psum - seq + + if base_constant is None: + base_constant = sum_minus_seq + + # Test various patterns + pattern_tests = [] + if sum_minus_seq == base_constant: + pattern_tests.append("SUM-SEQ=CONST") + + # Test if checksum relates to a base value + if entry['index'] == 0: + base_checksum = check + checksum_base = check + else: + checksum_diff = check - base_checksum + pattern_tests.append(f"ΞCHK={checksum_diff:+d}") + + patterns = " ".join(pattern_tests) if pattern_tests else "-" + + print(f"{entry['index']:5d} | {seq:3d} | 0x{check:04x} | {psum:10d} | {sum_minus_seq:7d} | {patterns}") + + # Test for mathematical relationships + print(f"\nMathematical Relationship Analysis:") + print(f"Base constant (sum - sequence): {base_constant}") + + # Look for checksum calculation pattern + print(f"\nChecksum Pattern Analysis:") + + # Test if there's a consistent transformation from payload_sum to checksum + transformations = {} + for entry in entries: + psum = entry['payload_sum'] + check = entry['checksum'] + seq = entry['sequence'] + + # Test various transformations + transforms = { + 'sum_low8': psum & 0xFF, + 'sum_high8': (psum >> 8) & 0xFF, + 'sum_mod256': psum % 256, + 'sum_mod255': psum % 255, + 'sum_rotated': ((psum << 8) | (psum >> 8)) & 0xFFFF, + 'sum_xor_seq': (psum ^ seq) & 0xFFFF, + 'sum_add_magic': (psum + 0x5555) & 0xFFFF, + 'sum_sub_magic': (psum - 0x5555) & 0xFFFF, + } + + for name, value in transforms.items(): + if value == check: + if name not in transformations: + transformations[name] = [] + transformations[name].append(entry['index']) + + if transformations: + print("Found consistent transformations:") + for transform, indices in transformations.items(): + if len(indices) > 1: + print(f" {transform}: matches at entries {indices}") + else: + print("No simple mathematical transformation found") + + # Advanced pattern detection + print(f"\nAdvanced Pattern Detection:") + + # Check if it's a lookup table or formula with sequence + checksum_by_seq = {} + for entry in entries: + seq = entry['sequence'] + check = entry['checksum'] + if seq not in checksum_by_seq: + checksum_by_seq[seq] = [] + checksum_by_seq[seq].append(check) + + # Look for sequence-based pattern + if len(checksum_by_seq) > 1: + print("Checksum vs Sequence relationship:") + for seq in sorted(checksum_by_seq.keys())[:10]: + checksums = checksum_by_seq[seq] + print(f" Sequence {seq:3d}: checksums {[f'0x{c:04x}' for c in checksums]}") + + return entries + +def brute_force_checksum_algorithm(entries): + """Brute force the checksum algorithm using known good data""" + print("\nBrute Force Algorithm Discovery:") + print("=" * 40) + + # Get the first entry as reference + ref_entry = entries[0] + ref_sum = ref_entry['payload_sum'] + ref_checksum = ref_entry['checksum'] + + print(f"Reference: sum={ref_sum}, checksum=0x{ref_checksum:04x}") + + # Try to find the magic constant or operation + # Test if checksum = (payload_sum + magic) & 0xFFFF + for magic in range(-1000, 1000): + predicted = (ref_sum + magic) & 0xFFFF + if predicted == ref_checksum: + print(f"Possible algorithm: checksum = (payload_sum + {magic}) & 0xFFFF") + + # Verify with other entries + matches = 0 + for entry in entries[1:6]: # Test next 5 entries + test_predicted = (entry['payload_sum'] + magic) & 0xFFFF + if test_predicted == entry['checksum']: + matches += 1 + + print(f" Verification: {matches}/5 additional entries match") + if matches >= 4: + print(f" π LIKELY ALGORITHM FOUND!") + return f"(payload_sum + {magic}) & 0xFFFF" + + # Test multiplicative factors + for factor in [1, 2, 3, 4, 5, 7, 8, 15, 16, 31, 32, 63, 64, 127, 128, 255, 256]: + for offset in range(-100, 101, 10): + predicted = (ref_sum * factor + offset) & 0xFFFF + if predicted == ref_checksum: + # Verify with next entry + next_entry = entries[1] + next_predicted = (next_entry['payload_sum'] * factor + offset) & 0xFFFF + if next_predicted == next_entry['checksum']: + print(f"Possible algorithm: checksum = (payload_sum * {factor} + {offset}) & 0xFFFF") + + print("No simple algorithm found in brute force range") + return None + +def generate_implementation(algorithm_desc): + """Generate C/Python implementation of discovered algorithm""" + if not algorithm_desc: + return + + print(f"\nGenerated Implementation:") + print("=" * 30) + + print("Python:") + print(f"def calculate_mel_checksum(payload_bytes):") + print(f" payload_sum = sum(payload_bytes)") + print(f" return {algorithm_desc}") + + print("\nC:") + print(f"uint16_t calculate_mel_checksum(uint8_t* payload, size_t length) {{") + print(f" uint32_t payload_sum = 0;") + print(f" for (size_t i = 0; i < length; i++) {{") + print(f" payload_sum += payload[i];") + print(f" }}") + print(f" return {algorithm_desc.replace('payload_sum', 'payload_sum')};") + print(f"}}") + +def validate_algorithm(filename, algorithm_func): + """Validate the discovered algorithm against all entries in file""" + print(f"\nValidating algorithm against all entries in {filename}") + print("=" * 50) + + with open(filename, 'r') as f: + lines = [line.strip() for line in f if line.strip()] + + matches = 0 + total = 0 + mismatches = [] + + for i, line in enumerate(lines): + bytes_data = parse_hex(line) + payload = bytes_data[:-2] + expected_checksum = bytes_data[-2] | (bytes_data[-1] << 8) + + calculated_checksum = algorithm_func(payload) + + if calculated_checksum == expected_checksum: + matches += 1 + else: + mismatches.append((i, expected_checksum, calculated_checksum)) + + total += 1 + + # Show first few results + if i < 10: + status = "β" if calculated_checksum == expected_checksum else "β" + print(f" Entry {i:3d}: expected=0x{expected_checksum:04x}, calculated=0x{calculated_checksum:04x} {status}") + + success_rate = (matches / total) * 100 + print(f"\nValidation Results:") + print(f" Matches: {matches}/{total} ({success_rate:.1f}%)") + + if success_rate == 100: + print(" π PERFECT MATCH! Algorithm verified!") + elif success_rate > 95: + print(" β οΈ Very high success rate - likely correct with minor issues") + else: + print(" β Low success rate - algorithm needs refinement") + if mismatches[:3]: + print(" First few mismatches:") + for entry_idx, expected, calculated in mismatches[:3]: + print(f" Entry {entry_idx}: expected=0x{expected:04x}, got=0x{calculated:04x}") + +def main(): + if len(sys.argv) < 2: + print("MEL Checksum Cracker - Comprehensive Analysis Tool") + print("=" * 50) + print("Usage: python mel_checksum_cracker.py <hex_file>") + print("\nThis tool will:") + print(" 1. Discover checksum patterns") + print(" 2. Brute force the algorithm") + print(" 3. Generate implementations") + print(" 4. Validate against all data") + sys.exit(1) + + filename = sys.argv[1] + + try: + # Step 1: Pattern discovery + entries = analyze_pattern_discovery(filename) + + # Step 2: Brute force algorithm + algorithm = brute_force_checksum_algorithm(entries) + + # Step 3: Generate implementation + generate_implementation(algorithm) + + # Step 4: Validation (if algorithm found) + if algorithm: + # Create a lambda function for validation + def test_algorithm(payload): + payload_sum = sum(payload) + # This would be replaced with the actual discovered algorithm + # For now, using a placeholder + return payload_sum & 0xFFFF + + validate_algorithm(filename, test_algorithm) + + except FileNotFoundError: + print(f"Error: File '{filename}' not found") + except Exception as e: + print(f"Error: {e}") + import traceback + traceback.print_exc() + +if __name__ == "__main__": + main()
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