def extract_strings(data, keys):
fd = BytesIO(keys)
keys = [fd.read(16) for i in range(U8.read(fd))]
if not keys:
return
fd = BytesIO(data)
for i in range(U32LE.read(fd)):
msg = fd.read(U32LE.read(fd))
key = keys[i % len(keys)]
return Decryptor(key).decrypt(msg)
def read_tag(fd):
header = U16LE.read(fd)
tag_type = header >> 6
tag_length = header & 0x3f
if tag_length == 0x3f:
tag_length = U32LE.read(fd)
tag_data = fd.read(tag_length)
return Tag(tag_type, tag_data)
