calvin.erfmann/WhatsApp-Chat-Exporter
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Implement exporting 64-digit crypt15 encryption key

Browse Source 
https://github.com/KnugiHK/Whatsapp-Chat-Exporter/issues/20
This commit is contained in:
KnugiHK
2022-09-05 12:16:07 +08:00
parent 422ab2f784
commit 48f667d02b
2 changed files with 15 additions and 5 deletions
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11
Whatsapp_Chat_Exporter/extract.py
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@@ -71,7 +71,7 @@ def _generate_hmac_of_hmac(key_stream):
b"backup encryption\x01",
sha256
)
return key.digest()
return key.digest(), key_stream
def _extract_encrypted_key(keyfile):
@@ -82,7 +82,7 @@ def _extract_encrypted_key(keyfile):
return _generate_hmac_of_hmac(key_stream)
def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14):
def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14, show_crypt15=False):
if not support_backup:
return 1
if isinstance(key, io.IOBase):
@@ -119,9 +119,12 @@ def decrypt_backup(database, key, output, crypt=Crypt.CRYPT14):
if crypt == Crypt.CRYPT15:
if len(key) == 32:
main_key = _generate_hmac_of_hmac(key)
main_key, hex_key = _generate_hmac_of_hmac(key)
else:
main_key = _extract_encrypted_key(key)
main_key, hex_key = _extract_encrypted_key(key)
if show_crypt15:
hex_key = [hex_key.hex()[c:c+4] for c in range(0, len(hex_key.hex()), 4)]
print("The HEX key of the crypt15 backup is: " + ' '.join(hex_key))
else:
main_key = key[126:]
decompressed = False