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Implement dry-run for decrypting Android backup #130

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KnugiHK
2025-02-21 22:47:52 +08:00
parent 8c85656831
commit d6b1d944bf
1 changed files with 6 additions and 3 deletions
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9
Whatsapp_Chat_Exporter/android_handler.py
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@@ -53,9 +53,11 @@ def _extract_encrypted_key(keyfile):
return _generate_hmac_of_hmac(key_stream) return _generate_hmac_of_hmac(key_stream)
def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14, show_crypt15=False, db_type=DbType.MESSAGE): def decrypt_backup(database, key, output=None, crypt=Crypt.CRYPT14, show_crypt15=False, db_type=DbType.MESSAGE, dry_run=False):
if not support_backup: if not support_backup:
return 1 return 1
if not dry_run and output is None:
ValueError("The path to the decrypted database must be specified unless dry_run is true.")
if isinstance(key, io.IOBase): if isinstance(key, io.IOBase):
key = key.read() key = key.read()
if crypt is not Crypt.CRYPT15: if crypt is not Crypt.CRYPT15:
@@ -146,8 +148,9 @@ def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14, show_crypt15=Fals
else: else:
decompressed = True decompressed = True
if db[0:6].upper() == b"SQLITE": if db[0:6].upper() == b"SQLITE":
with open(output, "wb") as f: if not dry_run:
f.write(db) with open(output, "wb") as f:
f.write(db)
return 0 return 0
else: else:
raise ValueError("The plaintext is not a SQLite database. Did you use the key to encrypt something...") raise ValueError("The plaintext is not a SQLite database. Did you use the key to encrypt something...")