Vesselin Bontchev
03fb314acf
Add support for playing Audible AAXC (.aaxc) files [PATCH v4] ...
The AAXC container format is the same as the (already supported) Audible
AAX format but it uses a different encryption scheme.
Note: audible_key and audible_iv values are variable (per file) and are
externally fed.
It is possible to extend https://github.com/mkb79/Audible to derive the
audible_key and audible_key values.
Relevant code:
def decrypt_voucher(deviceSerialNumber, customerId, deviceType, asin, voucher):
buf = (deviceType + deviceSerialNumber + customerId + asin).encode("ascii")
digest = hashlib.sha256(buf).digest()
key = digest[0:16]
iv = digest[16:]
# decrypt "voucher" using AES in CBC mode with no padding
cipher = AES.new(key, AES.MODE_CBC, iv)
plaintext = cipher.decrypt(voucher).rstrip(b"\x00") # improve this!
return json.loads(plaintext)
The decrypted "voucher" has the required audible_key and audible_iv
values.
Update (Nov-2020): This patch has now been tested by multiple folks -
details at the following URL:
https://github.com/mkb79/Audible/issues/3
Signed-off-by: Vesselin Bontchev <vesselin.bontchev@yandex.com>
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