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• Add support for playing Audible AAXC (.aaxc) files [PATCH v4]

  1er janvier 2000, par Vesselin Bontchev

  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>
  

  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c