_archive/analysis/analyze_decrypt.py

"""
OneOCR .onemodel file analysis and decryption attempt.

Known facts:
- AES-256-CFB via Windows BCrypt CNG API
- SHA256 used somewhere in the process
- Key: kj)TGtrK>f]b[Piow.gU+nC@s""""""4  (32 ASCII bytes = 256 bits)
- After decryption → decompression (zlib/lz4/etc.)
- Error on wrong key: meta->magic_number == MAGIC_NUMBER (0 vs. 1)
"""

import struct
import hashlib
import zlib
import os
from collections import Counter
from typing import Optional

# ── Try to import crypto libraries ──
try:
    from Crypto.Cipher import AES as PyCryptoAES
    HAS_PYCRYPTODOME = True
except ImportError:
    HAS_PYCRYPTODOME = False
    print("[WARN] PyCryptodome not available, install with: pip install pycryptodome")

try:
    from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
    from cryptography.hazmat.backends import default_backend
    HAS_CRYPTOGRAPHY = True
except ImportError:
    HAS_CRYPTOGRAPHY = False
    print("[WARN] cryptography not available, install with: pip install cryptography")


# ═══════════════════════════════════════════════════════════════
# CONFIGURATION
# ═══════════════════════════════════════════════════════════════

MODEL_PATH = r"c:\Users\MattyMroz\Desktop\PROJECTS\ONEOCR\ocr_data\oneocr.onemodel"

# The key as raw bytes (32 bytes = 256 bits for AES-256)
KEY_RAW = b'kj)TGtrK>f]b[Piow.gU+nC@s""""""4'
assert len(KEY_RAW) == 32, f"Key must be 32 bytes, got {len(KEY_RAW)}"

# SHA256 of the key (another possible key derivation)
KEY_SHA256 = hashlib.sha256(KEY_RAW).digest()


# ═══════════════════════════════════════════════════════════════
# HELPER FUNCTIONS
# ═══════════════════════════════════════════════════════════════

def hex_dump(data: bytes, offset: int = 0, max_lines: int = 32) -> str:
    """Format bytes as hex dump with ASCII column."""
    lines = []
    for i in range(0, min(len(data), max_lines * 16), 16):
        hex_part = " ".join(f"{b:02x}" for b in data[i:i+16])
        ascii_part = "".join(chr(b) if 32 <= b < 127 else "." for b in data[i:i+16])
        lines.append(f"  {offset+i:08x}: {hex_part:<48s}  {ascii_part}")
    return "\n".join(lines)


def entropy(data: bytes) -> float:
    """Calculate Shannon entropy (0-8 bits per byte)."""
    if not data:
        return 0.0
    import math
    freq = Counter(data)
    total = len(data)
    return -sum((c / total) * math.log2(c / total) for c in freq.values())


def unique_byte_ratio(data: bytes) -> str:
    """Return unique bytes count."""
    return f"{len(set(data))}/256"


def check_known_headers(data: bytes) -> list[str]:
    """Check if data starts with known file/compression magic numbers."""
    findings = []
    if len(data) < 4:
        return findings

    # Magic number checks
    magics = {
        b"\x08": "Protobuf varint field tag (field 1, wire type 0)",
        b"\x0a": "Protobuf length-delimited field tag (field 1, wire type 2)",
        b"\x78\x01": "Zlib (low compression)",
        b"\x78\x5e": "Zlib (default compression)",
        b"\x78\x9c": "Zlib (best speed/default)",
        b"\x78\xda": "Zlib (best compression)",
        b"\x1f\x8b": "Gzip",
        b"\x04\x22\x4d\x18": "LZ4 frame",
        b"\x28\xb5\x2f\xfd": "Zstandard",
        b"\xfd\x37\x7a\x58\x5a\x00": "XZ",
        b"\x42\x5a\x68": "Bzip2",
        b"PK": "ZIP archive",
        b"\x89PNG": "PNG image",
        b"ONNX": "ONNX text",
        b"\x08\x00": "Protobuf: field 1, varint, value will follow",
        b"\x08\x01": "Protobuf: field 1, varint = 1 (could be magic_number=1!)",
        b"\x08\x02": "Protobuf: field 1, varint = 2",
        b"\x08\x03": "Protobuf: field 1, varint = 3",
        b"\x08\x04": "Protobuf: field 1, varint = 4",
        b"\x50\x42": "Possible PB (protobuf) marker",
        b"\x01\x00\x00\x00": "uint32 LE = 1 (possible magic_number=1)",
        b"\x00\x00\x00\x01": "uint32 BE = 1 (possible magic_number=1)",
    }

    for magic, desc in magics.items():
        if data[:len(magic)] == magic:
            findings.append(f"  ★ MATCH: {desc} ({magic.hex()})")

    # Check first uint32 LE/BE
    u32_le = struct.unpack_from("<I", data, 0)[0]
    u32_be = struct.unpack_from(">I", data, 0)[0]
    if u32_le == 1:
        findings.append(f"  ★ uint32_LE at offset 0 = 1 (MAGIC_NUMBER match!)")
    if u32_be == 1:
        findings.append(f"  ★ uint32_BE at offset 0 = 1 (MAGIC_NUMBER match!)")

    return findings


def try_decompress(data: bytes, label: str = "") -> Optional[bytes]:
    """Try various decompression methods."""
    results = []

    # Zlib (with and without header)
    for wbits in [15, -15, 31]:  # standard, raw deflate, gzip
        try:
            dec = zlib.decompress(data, wbits)
            results.append(("zlib" + (f" wbits={wbits}" if wbits != 15 else ""), dec))
        except:
            pass

    # LZ4
    try:
        import lz4.frame
        dec = lz4.frame.decompress(data)
        results.append(("lz4.frame", dec))
    except:
        pass

    try:
        import lz4.block
        for size in [1 << 20, 1 << 22, 1 << 24]:
            try:
                dec = lz4.block.decompress(data, uncompressed_size=size)
                results.append((f"lz4.block (uncompressed_size={size})", dec))
                break
            except:
                pass
    except:
        pass

    # Zstandard
    try:
        import zstandard as zstd
        dctx = zstd.ZstdDecompressor()
        dec = dctx.decompress(data, max_output_size=len(data) * 10)
        results.append(("zstandard", dec))
    except:
        pass

    if results:
        for method, dec in results:
            print(f"    ✓ {label} Decompression SUCCESS with {method}: {len(dec)} bytes")
            print(f"      First 64 bytes: {dec[:64].hex()}")
            print(f"      Entropy: {entropy(dec[:4096]):.3f}, unique: {unique_byte_ratio(dec[:4096])}")
            headers = check_known_headers(dec)
            for h in headers:
                print(f"      {h}")
        return results[0][1]
    return None


def decrypt_aes_cfb(data: bytes, key: bytes, iv: bytes, segment_size: int = 8) -> Optional[bytes]:
    """Decrypt using AES-CFB with given parameters."""
    if HAS_PYCRYPTODOME:
        try:
            cipher = PyCryptoAES.new(key, PyCryptoAES.MODE_CFB, iv=iv, segment_size=segment_size)
            return cipher.decrypt(data)
        except Exception as e:
            return None

    if HAS_CRYPTOGRAPHY:
        try:
            if segment_size == 128:
                cipher = Cipher(algorithms.AES(key), modes.CFB(iv), backend=default_backend())
            elif segment_size == 8:
                cipher = Cipher(algorithms.AES(key), modes.CFB8(iv), backend=default_backend())
            else:
                return None
            decryptor = cipher.decryptor()
            return decryptor.update(data) + decryptor.finalize()
        except Exception as e:
            return None

    return None


def analyze_decrypted(data: bytes, label: str) -> bool:
    """Analyze decrypted data and return True if it looks promising."""
    if data is None:
        return False

    ent = entropy(data[:4096])
    unique = unique_byte_ratio(data[:4096])
    headers = check_known_headers(data)

    is_promising = (
        ent < 7.5 or  # reduced entropy
        len(headers) > 0 or  # known header match
        data[:4] == b"\x01\x00\x00\x00" or  # magic_number = 1 LE
        data[:4] == b"\x00\x00\x00\x01" or  # magic_number = 1 BE
        data[:2] == b"\x08\x01"  # protobuf magic_number = 1
    )

    if is_promising:
        print(f"  ★★★ PROMISING: {label}")
        print(f"    Entropy: {ent:.3f}, Unique bytes: {unique}")
        print(f"    First 128 bytes:")
        print(hex_dump(data[:128]))
        for h in headers:
            print(f"    {h}")

        # Try decompression on promising results
        try_decompress(data, label)

        # If starts with protobuf-like data or magic=1, also try decompressing after skipping some bytes
        for skip in [4, 8, 12, 16, 20]:
            if len(data) > skip + 10:
                try_decompress(data[skip:], f"{label} [skip {skip} bytes]")

        return True
    return False


# ═══════════════════════════════════════════════════════════════
# MAIN ANALYSIS
# ═══════════════════════════════════════════════════════════════

def main():
    print("=" * 80)
    print("OneOCR .onemodel File Analysis & Decryption Attempt")
    print("=" * 80)

    # ── Step 1: Read file ──
    with open(MODEL_PATH, "rb") as f:
        full_data = f.read()

    filesize = len(full_data)
    print(f"\nFile size: {filesize:,} bytes ({filesize/1024/1024:.2f} MB)")

    # ── Step 2: Parse top-level structure ──
    print("\n" + "═" * 80)
    print("SECTION 1: FILE STRUCTURE ANALYSIS")
    print("═" * 80)

    header_offset = struct.unpack_from("<I", full_data, 0)[0]
    field_at_4 = struct.unpack_from("<I", full_data, 4)[0]
    print(f"\n  [0-3]   uint32_LE (header_offset/size): {header_offset} (0x{header_offset:08x})")
    print(f"  [4-7]   uint32_LE: {field_at_4} (0x{field_at_4:08x})")

    # Check if it's a uint64
    u64_at_0 = struct.unpack_from("<Q", full_data, 0)[0]
    print(f"  [0-7]   uint64_LE: {u64_at_0} (0x{u64_at_0:016x})")

    # Analyze the metadata at offset 22636
    print(f"\n  At offset {header_offset} (0x{header_offset:04x}):")
    meta_magic_8 = full_data[header_offset:header_offset+8]
    meta_size = struct.unpack_from("<Q", full_data, header_offset + 8)[0]
    print(f"    [+0..+7]  8 bytes: {meta_magic_8.hex()}")
    print(f"    [+8..+15] uint64_LE: {meta_size:,} (0x{meta_size:016x})")
    encrypted_start = header_offset + 16
    encrypted_size = meta_size
    print(f"    Encrypted payload: offset {encrypted_start} ({encrypted_start:#x}), size {encrypted_size:,}")
    print(f"    Check: {encrypted_start} + {encrypted_size} = {encrypted_start + encrypted_size} "
          f"vs filesize {filesize} → {'MATCH ✓' if encrypted_start + encrypted_size == filesize else 'MISMATCH ✗'}")

    # ── Step 3: Analyze header region ──
    print(f"\n  Header region [8 .. {header_offset-1}]: {header_offset - 8} bytes")
    header_data = full_data[8:header_offset]
    print(f"    Entropy: {entropy(header_data[:4096]):.3f}")
    print(f"    Unique bytes (first 4KB): {unique_byte_ratio(header_data[:4096])}")
    print(f"    Null bytes: {header_data.count(0)}/{len(header_data)}")

    # ── Step 4: Analyze encrypted payload region ──
    print(f"\n  Encrypted payload [{encrypted_start} .. {filesize-1}]: {encrypted_size:,} bytes")
    payload_sample = full_data[encrypted_start:encrypted_start+4096]
    print(f"    Entropy (first 4KB): {entropy(payload_sample):.3f}")
    print(f"    Unique bytes (first 4KB): {unique_byte_ratio(payload_sample)}")

    # ── Step 5: Look for structure in metadata ──
    print(f"\n  Detailed metadata dump at offset {header_offset}:")
    print(hex_dump(full_data[header_offset:header_offset+128], offset=header_offset))

    # Parse more fields from the metadata region
    print(f"\n  Parsing fields after metadata header:")
    meta_region = full_data[header_offset:header_offset + 256]
    for i in range(0, 128, 4):
        u32 = struct.unpack_from("<I", meta_region, i)[0]
        if u32 > 0 and u32 < filesize:
            print(f"    +{i:3d}: u32={u32:12,d} (0x{u32:08x})"
                  f"  {'← could be offset/size' if 100 < u32 < filesize else ''}")

    # ── Step 6: Hash analysis of key ──
    print("\n" + "═" * 80)
    print("SECTION 2: KEY ANALYSIS")
    print("═" * 80)
    print(f"\n  Raw key ({len(KEY_RAW)} bytes): {KEY_RAW}")
    print(f"  Raw key hex: {KEY_RAW.hex()}")
    print(f"  SHA256 of key: {KEY_SHA256.hex()}")

    # Check if SHA256 of key appears in the file header
    if KEY_SHA256 in full_data[:header_offset + 256]:
        idx = full_data.index(KEY_SHA256)
        print(f"  ★ SHA256 of key FOUND in file at offset {idx}!")
    else:
        print(f"  SHA256 of key not found in first {header_offset + 256} bytes")

    # Check if the 8-byte magic at offset 22636 could be related to key hash
    key_sha256_first8 = KEY_SHA256[:8]
    print(f"  First 8 bytes of SHA256(key): {key_sha256_first8.hex()}")
    print(f"  8 bytes at offset {header_offset}: {meta_magic_8.hex()}")
    print(f"  Match: {'YES ★' if key_sha256_first8 == meta_magic_8 else 'NO'}")

    # ── Step 7: Decryption attempts ──
    print("\n" + "═" * 80)
    print("SECTION 3: DECRYPTION ATTEMPTS")
    print("═" * 80)

    # Prepare IV candidates
    iv_zero = b"\x00" * 16
    iv_from_8 = full_data[8:24]
    iv_from_4 = full_data[4:20]
    iv_from_file_start = full_data[0:16]
    iv_from_meta = full_data[header_offset:header_offset + 16]
    iv_from_meta_8 = meta_magic_8 + b"\x00" * 8  # pad the 8-byte magic to 16

    # SHA256 of key, take first 16 bytes as IV
    iv_sha256_key_first16 = KEY_SHA256[:16]

    iv_candidates = {
        "all-zeros": iv_zero,
        "file[8:24]": iv_from_8,
        "file[4:20]": iv_from_4,
        "file[0:16]": iv_from_file_start,
        f"file[{header_offset}:{header_offset+16}]": iv_from_meta,
        "meta_magic+padding": iv_from_meta_8,
        "SHA256(key)[:16]": iv_sha256_key_first16,
    }

    # Key candidates
    key_candidates = {
        "RAW key (32 bytes)": KEY_RAW,
        "SHA256(RAW key)": KEY_SHA256,
    }

    # Data regions to try decrypting
    # We try both the header data and the start of the encrypted payload
    regions = {
        "header[8:22636]": full_data[8:min(8 + 4096, header_offset)],
        f"payload[{encrypted_start}:]": full_data[encrypted_start:encrypted_start + 4096],
    }

    # Also try: what if the entire region from byte 8 to end is one encrypted blob?
    regions["all_encrypted[8:]"] = full_data[8:8 + 4096]

    # Segment sizes: Windows BCrypt CFB defaults to 8-bit (CFB8), also try 128-bit (CFB128)
    segment_sizes = [8, 128]

    total_attempts = 0
    promising_results = []

    for key_name, key in key_candidates.items():
        for iv_name, iv in iv_candidates.items():
            for seg_size in segment_sizes:
                for region_name, region_data in regions.items():
                    total_attempts += 1
                    label = f"key={key_name}, iv={iv_name}, CFB{seg_size}, region={region_name}"

                    decrypted = decrypt_aes_cfb(region_data, key, iv, seg_size)
                    if decrypted and analyze_decrypted(decrypted, label):
                        promising_results.append(label)

    print(f"\n  Total attempts: {total_attempts}")
    print(f"  Promising results: {len(promising_results)}")

    # ── Step 8: Additional IV strategies ──
    print("\n" + "═" * 80)
    print("SECTION 4: ADVANCED IV STRATEGIES")
    print("═" * 80)

    # Strategy: IV might be derived from the file content
    # Try every 16-byte aligned position in the first 256 bytes as IV
    print("\n  Trying every 16-byte aligned offset in first 256 bytes as IV...")

    for iv_offset in range(0, 256, 4):  # try every 4-byte step
        iv_cand = full_data[iv_offset:iv_offset + 16]
        if len(iv_cand) < 16:
            continue

        for key in [KEY_RAW, KEY_SHA256]:
            for seg in [8, 128]:
                # Try decrypting the payload
                payload_start = encrypted_start
                test_data = full_data[payload_start:payload_start + 4096]
                decrypted = decrypt_aes_cfb(test_data, key, iv_cand, seg)
                if decrypted:
                    is_good = analyze_decrypted(decrypted,
                        f"iv_offset={iv_offset}, key={'raw' if key == KEY_RAW else 'sha256'}, CFB{seg}, payload")
                    if is_good:
                        promising_results.append(f"Advanced: iv_offset={iv_offset}")

                # Try decrypting from byte 8 (header encrypted area)
                test_data2 = full_data[8:8 + 4096]
                decrypted2 = decrypt_aes_cfb(test_data2, key, iv_cand, seg)
                if decrypted2:
                    is_good = analyze_decrypted(decrypted2,
                        f"iv_offset={iv_offset}, key={'raw' if key == KEY_RAW else 'sha256'}, CFB{seg}, header[8:]")
                    if is_good:
                        promising_results.append(f"Advanced: iv_offset={iv_offset} header")

    # ── Step 9: Try with IV = SHA256 of various things ──
    print("\n" + "═" * 80)
    print("SECTION 5: DERIVED IV STRATEGIES")
    print("═" * 80)

    derived_ivs = {
        "SHA256(key)[:16]": hashlib.sha256(KEY_RAW).digest()[:16],
        "SHA256(key)[16:]": hashlib.sha256(KEY_RAW).digest()[16:],
        "SHA256('')[:16]": hashlib.sha256(b"").digest()[:16],
        "MD5(key)": hashlib.md5(KEY_RAW).digest(),
        "SHA256(file[0:8])[:16]": hashlib.sha256(full_data[0:8]).digest()[:16],
        "SHA256(file[0:4])[:16]": hashlib.sha256(full_data[0:4]).digest()[:16],
        "SHA256('oneocr')[:16]": hashlib.sha256(b"oneocr").digest()[:16],
        "SHA256('oneocr.onemodel')[:16]": hashlib.sha256(b"oneocr.onemodel").digest()[:16],
    }

    for iv_name, iv in derived_ivs.items():
        for key_name, key in key_candidates.items():
            for seg in [8, 128]:
                for region_name, region_data in regions.items():
                    label = f"key={key_name}, iv={iv_name}, CFB{seg}, region={region_name}"
                    decrypted = decrypt_aes_cfb(region_data, key, iv, seg)
                    if decrypted and analyze_decrypted(decrypted, label):
                        promising_results.append(label)

    # ── Step 10: What if the structure is different? ──
    print("\n" + "═" * 80)
    print("SECTION 6: ALTERNATIVE STRUCTURE HYPOTHESES")
    print("═" * 80)

    # Hypothesis A: Bytes 0-3 = offset, 4-7 = 0, 8-23 = IV, 24+ = encrypted data
    print("\n  Hypothesis A: [0-3]=offset, [4-7]=flags, [8-23]=IV, [24+]=encrypted")
    iv_hyp_a = full_data[8:24]
    encrypted_hyp_a = full_data[24:24 + 4096]
    for key_name, key in key_candidates.items():
        for seg in [8, 128]:
            dec = decrypt_aes_cfb(encrypted_hyp_a, key, iv_hyp_a, seg)
            if dec:
                analyze_decrypted(dec, f"HypA: key={key_name}, CFB{seg}")

    # Hypothesis B: [0-7]=header, [8-23]=IV, [24-22635]=encrypted meta, then payload also encrypted
    print("\n  Hypothesis B: [0-7]=header, [22636-22651]=16-byte meta, payload starts at 22652")
    print(f"    If meta[22636:22652] contains IV for payload:")
    iv_hyp_b = full_data[header_offset:header_offset + 16]
    enc_payload = full_data[encrypted_start:encrypted_start + 4096]
    for key_name, key in key_candidates.items():
        for seg in [8, 128]:
            dec = decrypt_aes_cfb(enc_payload, key, iv_hyp_b, seg)
            if dec:
                analyze_decrypted(dec, f"HypB: key={key_name}, CFB{seg}, payload with meta-IV")

    # Hypothesis C: The entire file from byte 8 to end is one encrypted stream (IV = zeros)
    print("\n  Hypothesis C: Single encrypted stream from byte 8, IV=zeros")
    single_stream = full_data[8:8 + 4096]
    for key_name, key in key_candidates.items():
        for seg in [8, 128]:
            dec = decrypt_aes_cfb(single_stream, key, iv_zero, seg)
            if dec:
                analyze_decrypted(dec, f"HypC: key={key_name}, CFB{seg}")

    # Hypothesis D: Encrypted data starts right at byte 0 (the header_size field IS part of encrypted data)
    # This would mean the header_size value 22636 is coincidental
    print("\n  Hypothesis D: Encrypted from byte 0, IV=zeros")
    for key_name, key in key_candidates.items():
        for seg in [8, 128]:
            dec = decrypt_aes_cfb(full_data[:4096], key, iv_zero, seg)
            if dec:
                analyze_decrypted(dec, f"HypD: key={key_name}, CFB{seg}, from byte 0")

    # Hypothesis E: Windows CNG might prepend IV to ciphertext
    # So bytes 0-3 = header_size, 4-7 = 0, 8-23 = IV (embedded in encrypted blob), 24+ = ciphertext
    print("\n  Hypothesis E: IV prepended to ciphertext at various offsets")
    for data_start in [0, 4, 8]:
        iv_e = full_data[data_start:data_start + 16]
        ct_e = full_data[data_start + 16:data_start + 16 + 4096]
        for key_name, key in key_candidates.items():
            for seg in [8, 128]:
                dec = decrypt_aes_cfb(ct_e, key, iv_e, seg)
                if dec:
                    analyze_decrypted(dec, f"HypE: data_start={data_start}, key={key_name}, CFB{seg}")

    # ── Step 11: Try OFB and CTR modes too (just in case CFB was misidentified) ──
    print("\n" + "═" * 80)
    print("SECTION 7: ALTERNATIVE CIPHER MODES (OFB, CBC)")
    print("═" * 80)

    if HAS_PYCRYPTODOME:
        for data_start in [8, 24, encrypted_start]:
            for iv_offset in [0, 4, 8]:
                iv_alt = full_data[iv_offset:iv_offset + 16]
                test_data = full_data[data_start:data_start + 4096]
                for key in [KEY_RAW, KEY_SHA256]:
                    key_label = "raw" if key == KEY_RAW else "sha256"

                    # OFB
                    try:
                        cipher = PyCryptoAES.new(key, PyCryptoAES.MODE_OFB, iv=iv_alt)
                        dec = cipher.decrypt(test_data)
                        analyze_decrypted(dec, f"OFB: data@{data_start}, iv@{iv_offset}, key={key_label}")
                    except:
                        pass

                    # CBC (needs padding but try anyway)
                    try:
                        cipher = PyCryptoAES.new(key, PyCryptoAES.MODE_CBC, iv=iv_alt)
                        dec = cipher.decrypt(test_data)
                        analyze_decrypted(dec, f"CBC: data@{data_start}, iv@{iv_offset}, key={key_label}")
                    except:
                        pass

                    # ECB (no IV)
                    try:
                        cipher = PyCryptoAES.new(key, PyCryptoAES.MODE_ECB)
                        # ECB needs data aligned to 16 bytes
                        aligned = test_data[:len(test_data) - (len(test_data) % 16)]
                        dec = cipher.decrypt(aligned)
                        analyze_decrypted(dec, f"ECB: data@{data_start}, key={key_label}")
                    except:
                        pass

    # ── Step 12: Summary ──
    print("\n" + "═" * 80)
    print("SUMMARY")
    print("═" * 80)

    print(f"\n  File structure (confirmed):")
    print(f"    [0x0000 - 0x0007]  8-byte header: offset = {header_offset}")
    print(f"    [0x0008 - 0x{header_offset-1:04x}]  Encrypted header data ({header_offset - 8} bytes)")
    print(f"    [0x{header_offset:04x} - 0x{header_offset+7:04x}]  8-byte magic/hash: {meta_magic_8.hex()}")
    print(f"    [0x{header_offset+8:04x} - 0x{header_offset+15:04x}]  uint64 payload size: {meta_size:,}")
    print(f"    [0x{encrypted_start:04x} - 0x{filesize-1:07x}]  Encrypted payload ({encrypted_size:,} bytes)")

    print(f"\n  Key info:")
    print(f"    Raw key: {KEY_RAW}")
    print(f"    Raw key hex: {KEY_RAW.hex()}")
    print(f"    SHA256(key): {KEY_SHA256.hex()}")

    print(f"\n  Total promising decryption results: {len(promising_results)}")
    for r in promising_results:
        print(f"    ★ {r}")

    if not promising_results:
        print("\n  No successful decryption found with standard approaches.")
        print("  Possible reasons:")
        print("    1. The key might be processed differently (PBKDF2, HKDF, etc.)")
        print("    2. The IV might be derived in a non-standard way")
        print("    3. The file structure might be more complex")
        print("    4. The CBC/CFB segment size might be non-standard")
        print("    5. There might be additional authentication (AEAD)")
        print("    6. The BCrypt CNG API might use specific key blob format")
        print("    7. Think about BCRYPT_KEY_DATA_BLOB_HEADER structure")


if __name__ == "__main__":
    main()