# vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai ''' Obtain the user's ccHash from the Barnes & Noble Nook Windows Store app. https://www.microsoft.com/en-us/p/nook-books-magazines-newspapers-comics/9wzdncrfj33h (Requires a recent Windows version in a supported region (US).) This procedure has been tested with Nook app version 1.11.0.4 under Windows 11. Based on experimental standalone python script created by fesiwi at https://github.com/noDRM/DeDRM_tools/discussions/9 ''' import sys, os import apsw import base64 try: from Cryptodome.Cipher import AES except: from Crypto.Cipher import AES import hashlib from lxml import etree NOOK_DATA_FOLDER = "%LOCALAPPDATA%\\Packages\\BarnesNoble.Nook_ahnzqzva31enc\\LocalState" PASS_HASH_SECRET = "9ca588496a1bc4394553d9e018d70b9e" def unpad(data): if sys.version_info[0] == 2: pad_len = ord(data[-1]) else: pad_len = data[-1] return data[:-pad_len] def dump_keys(print_result=False): db_filename = os.path.expandvars(NOOK_DATA_FOLDER + "\\NookDB.db3") if not os.path.isfile(db_filename): print("Database file not found. Is the Nook Windows Store app installed?") return [] # Python2 has no fetchone() so we have to use fetchall() and discard everything but the first result. # There should only be one result anyways. serial_number = apsw.Connection(db_filename).cursor().execute( "SELECT value FROM bn_internal_key_value_table WHERE key = 'serialNumber';").fetchall()[0][0] hash_key = hashlib.sha1(bytearray.fromhex(serial_number + PASS_HASH_SECRET)).digest()[:16] activation_file_name = os.path.expandvars(NOOK_DATA_FOLDER + "\\settings\\activation.xml") if not os.path.isfile(activation_file_name): print("Activation file not found. Are you logged in to your Nook account?") return [] activation_xml = etree.parse(activation_file_name) decrypted_hashes = [] for pass_hash in activation_xml.findall(".//{http://ns.adobe.com/adept}passHash"): encrypted_cc_hash = base64.b64decode(pass_hash.text) cc_hash = unpad(AES.new(hash_key, AES.MODE_CBC, encrypted_cc_hash[:16]).decrypt(encrypted_cc_hash[16:])) decrypted_hashes.append((base64.b64encode(cc_hash).decode("ascii"))) if print_result: print("Nook ccHash is %s" % (base64.b64encode(cc_hash).decode("ascii"))) return decrypted_hashes if __name__ == "__main__": dump_keys(True)