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Allow users to set the number of threads for bruteforcing offsets

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KnugiHK
2025-03-02 15:44:40 +08:00
parent 8f0a9c3cc5
commit 0074acca7a
2 changed files with 14 additions and 6 deletions
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10
Whatsapp_Chat_Exporter/android_crypt.py
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@@ -114,12 +114,13 @@ def _decrypt_database(db_ciphertext: bytes, main_key: bytes, iv: bytes) -> bytes
)
return db
def _decrypt_crypt14(database: bytes, main_key: bytes) -> bytes:
def _decrypt_crypt14(database: bytes, main_key: bytes, max_worker: int = 10) -> bytes:
"""Decrypt a crypt14 database using multithreading for brute-force offset detection.
Args:
database (bytes): The encrypted database.
main_key (bytes): The decryption key.
max_worker (int, optional): The maximum number of threads to use for brute force. Defaults to 10.
Returns:
bytes: The decrypted database.
@@ -164,7 +165,7 @@ def _decrypt_crypt14(database: bytes, main_key: bytes) -> bytes:
except (zlib.error, ValueError):
return None # Decryption failed, move to next
with concurrent.futures.ThreadPoolExecutor(10) as executor:
with concurrent.futures.ThreadPoolExecutor(max_worker) as executor:
future_to_offset = {executor.submit(attempt_decrypt, offset): offset for offset in offset_combinations}
try:
@@ -247,7 +248,8 @@ def decrypt_backup(
db_type: DbType = DbType.MESSAGE,
*,
dry_run: bool = False,
keyfile_stream: bool = False
keyfile_stream: bool = False,
max_worker: int = 10
) -> int:
"""
Decrypt the WhatsApp backup database.
@@ -308,7 +310,7 @@ def decrypt_backup(
try:
if crypt == Crypt.CRYPT14:
db = _decrypt_crypt14(database, main_key)
db = _decrypt_crypt14(database, main_key, max_worker)
elif crypt == Crypt.CRYPT12:
db = _decrypt_crypt12(database, main_key)
elif crypt == Crypt.CRYPT15: