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| 1 | +#!/usr/bin/env python3 |
| 2 | + |
| 3 | +import os |
| 4 | +import random |
| 5 | +import argparse |
| 6 | +from pathlib import Path |
| 7 | + |
| 8 | + |
| 9 | +def ensure_dir(directory): |
| 10 | + """Create directory if it doesn't exist""" |
| 11 | + Path(directory).mkdir(parents=True, exist_ok=True) |
| 12 | + |
| 13 | + |
| 14 | +def generate_random_bytes(min_size, max_size): |
| 15 | + """Generate random bytes of size between min_size and max_size""" |
| 16 | + size = random.randint(min_size, max_size) |
| 17 | + return bytes(random.randint(0, 255) for _ in range(size)) |
| 18 | + |
| 19 | + |
| 20 | +def generate_tc_frame(): |
| 21 | + """Generate a TC frame with valid-looking header""" |
| 22 | + frame_size = random.randint(6, 1024) |
| 23 | + frame = bytearray(generate_random_bytes(frame_size, frame_size)) |
| 24 | + |
| 25 | + # Set basic TC frame header fields |
| 26 | + frame[0] = 0x20 # Version 1, Type TC |
| 27 | + frame[1] = 0x03 # SCID |
| 28 | + frame[2] = 0x00 | ((frame_size - 1) >> 8); # VCID |
| 29 | + frame[3] = (frame_size - 1) & 0xFF; # Frame length |
| 30 | + frame[4] = 0x00; # Frame Sequence Number |
| 31 | + |
| 32 | + return frame |
| 33 | + |
| 34 | + |
| 35 | +def generate_tm_frame(): |
| 36 | + """Generate a TM frame with valid-looking header""" |
| 37 | + frame_size = 1786 |
| 38 | + frame = bytearray(generate_random_bytes(frame_size, frame_size)) |
| 39 | + |
| 40 | + # Set basic TM frame header fields |
| 41 | + frame[0] = 0x02 # Version 1, TM |
| 42 | + frame[1] = 0xC0 # SCID |
| 43 | + frame[2] = 0x00 # VCID |
| 44 | + |
| 45 | + return frame |
| 46 | + |
| 47 | + |
| 48 | +def generate_aos_frame(): |
| 49 | + """Generate an AOS frame with valid-looking header""" |
| 50 | + frame_size = 1786 |
| 51 | + frame = bytearray(generate_random_bytes(frame_size, frame_size)) |
| 52 | + |
| 53 | + # Set basic AOS frame header fields |
| 54 | + frame[0] = 0x40 # Version 1, AOS |
| 55 | + frame[1] = 0xC0 # SCID |
| 56 | + frame[2] = 0x00 # VCID |
| 57 | + |
| 58 | + return frame |
| 59 | + |
| 60 | + |
| 61 | +def generate_corpus(output_dir, num_samples_per_selector=5): |
| 62 | + """Generate corpus files for each selector value""" |
| 63 | + ensure_dir(output_dir) |
| 64 | + |
| 65 | + # Generate samples for each selector (0-6) |
| 66 | + for selector in range(7): |
| 67 | + for i in range(num_samples_per_selector): |
| 68 | + # File naming: selector_type_variant.bin |
| 69 | + if selector in [0, 1]: # TC frame operations |
| 70 | + frame = generate_tc_frame() |
| 71 | + file_name = f"{selector:02d}_tc_{i:02d}.bin" |
| 72 | + elif selector in [2, 5]: # TM frame operations |
| 73 | + frame = generate_tm_frame() |
| 74 | + file_name = f"{selector:02d}_tm_{i:02d}.bin" |
| 75 | + elif selector in [3, 4]: # AOS frame operations |
| 76 | + frame = generate_aos_frame() |
| 77 | + file_name = f"{selector:02d}_aos_{i:02d}.bin" |
| 78 | + else: # selector == 6, TC frame for FECF check |
| 79 | + frame = generate_tc_frame() |
| 80 | + file_name = f"{selector:02d}_tc_fecf_{i:02d}.bin" |
| 81 | + |
| 82 | + # Add the selector byte at the beginning |
| 83 | + output = bytearray([selector]) + frame |
| 84 | + |
| 85 | + # Write to file |
| 86 | + with open(os.path.join(output_dir, file_name), "wb") as f: |
| 87 | + f.write(output) |
| 88 | + |
| 89 | + # Generate some edge cases |
| 90 | + edge_cases = [ |
| 91 | + # Minimal valid input (just selector) |
| 92 | + (0, bytearray([0])), |
| 93 | + (1, bytearray([1])), |
| 94 | + (2, bytearray([2])), |
| 95 | + (3, bytearray([3])), |
| 96 | + (4, bytearray([4])), |
| 97 | + (5, bytearray([5])), |
| 98 | + (6, bytearray([6])), |
| 99 | + |
| 100 | + # Very large inputs |
| 101 | + (0, bytearray([0]) + generate_random_bytes(2000, 2000)), |
| 102 | + (3, bytearray([3]) + generate_random_bytes(2000, 2000)), |
| 103 | + |
| 104 | + # Interesting byte patterns |
| 105 | + (0, bytearray([0]) + bytes([0xFF] * 50)), |
| 106 | + (1, bytearray([1]) + bytes([0x00] * 50)), |
| 107 | + (2, bytearray([2]) + bytes([i % 256 for i in range(100)])), |
| 108 | + (5, bytearray([5]) + bytes([0xAA, 0x55] * 25)) # Alternating bits |
| 109 | + ] |
| 110 | + |
| 111 | + for idx, (selector, data) in enumerate(edge_cases): |
| 112 | + file_name = f"edge_{idx:02d}_sel{selector}.bin" |
| 113 | + with open(os.path.join(output_dir, file_name), "wb") as f: |
| 114 | + f.write(data) |
| 115 | + |
| 116 | + |
| 117 | +def main(): |
| 118 | + parser = argparse.ArgumentParser( |
| 119 | + description='Generate corpus for CryptoLib fuzzer') |
| 120 | + parser.add_argument('--output', '-o', default='corpus', |
| 121 | + help='Output directory for corpus files') |
| 122 | + parser.add_argument('--samples', '-n', type=int, default=5, |
| 123 | + help='Number of samples per selector') |
| 124 | + args = parser.parse_args() |
| 125 | + |
| 126 | + print(f"Generating corpus in directory: {args.output}") |
| 127 | + generate_corpus(args.output, args.samples) |
| 128 | + print(f"Generated {7 * args.samples + 11} corpus files") |
| 129 | + |
| 130 | + |
| 131 | +if __name__ == "__main__": |
| 132 | + main() |
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