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Fix decryption flags for created WC24 tasks #6

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Merged
ColinGamez merged 1 commit into from
Jul 24, 2026
Merged

Fix decryption flags for created WC24 tasks #6

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20 changes: 18 additions & 2 deletions jwc24/dl_list.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,9 @@
FILE_SIZE = ENTRY_BASE + ENTRY_SIZE * ENTRY_COUNT
CHANNEL_CONTENT = 3
UNSIGNED_FLAG = 0x00000004
# Native encrypted channel-content tasks use bit 1 plus the WC24 decrypt bit.
# Without these, IOS writes the AES ciphertext into the VFF unchanged.
ENCRYPTED_CHANNEL_FLAGS = 0x0000000A


@dataclass(frozen=True)
Expand Down Expand Up @@ -102,12 +105,20 @@ def entries(data: bytes | bytearray) -> list[EntrySummary]:
return [value for slot in range(ENTRY_COUNT) if (value := entry(data, slot)) is not None]


def _created_task_flags(task: Task) -> int:
if task.unsigned:
return UNSIGNED_FLAG
if task.envelope == "wc24-aes-ofb":
return ENCRYPTED_CHANNEL_FLAGS
return 0


def _write_task(data: bytearray, manifest: ChannelManifest, task: Task) -> None:
offset = _entry_offset(task.slot)
data[offset : offset + ENTRY_SIZE] = b"\0" * ENTRY_SIZE
_put_u16(data, offset, task.slot)
data[offset + 2] = CHANNEL_CONTENT
_put_u32(data, offset + 4, UNSIGNED_FLAG if task.unsigned else 0)
_put_u32(data, offset + 4, _created_task_flags(task))
_put_u32(data, offset + 8, manifest.title_code)
_put_u32(data, offset + 12, manifest.title_type)
_put_u16(data, offset + 24, 1)
Expand Down Expand Up @@ -179,10 +190,15 @@ def provision(path: Path, manifest: ChannelManifest, apply: bool) -> tuple[list[
f"slot {task.slot} is occupied by {current.title_id:016x} {current.filename!r}"
)
expected_url = manifest.base_url + task.route
expected_flags = _created_task_flags(task)
if (
current
and current.url == expected_url
and bool(current.flags & UNSIGNED_FLAG) == task.unsigned
and (
current.flags == expected_flags
if task.mode == "create"
else bool(current.flags & UNSIGNED_FLAG) == task.unsigned
)
and current.entry_type == CHANNEL_CONTENT
):
if task.mode == "adopt":
Expand Down
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