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trezor-firmware/storage/tests/c/storage.py

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import ctypes as c
import os
import sys
sys.path.append(
os.path.normpath(
os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "python", "src")
)
)
import consts
EXTERNAL_SALT_LEN = 32
sectrue = -1431655766 # 0xAAAAAAAAA
class Storage:
def __init__(self, lib_name) -> None:
lib_path = os.path.join(os.path.dirname(__file__), lib_name)
self.lib = c.cdll.LoadLibrary(lib_path)
self.flash_size = c.cast(self.lib.FLASH_SIZE, c.POINTER(c.c_uint32))[0]
self.flash_buffer = c.create_string_buffer(self.flash_size)
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c.cast(self.lib.FLASH_BUFFER, c.POINTER(c.c_void_p))[0] = c.addressof(
self.flash_buffer
)
def init(self, salt: bytes) -> None:
self.lib.storage_init(0, salt, c.c_uint16(len(salt)))
def wipe(self) -> None:
self.lib.storage_wipe()
def unlock(self, pin: str, ext_salt: bytes = None) -> bool:
if ext_salt is not None and len(ext_salt) != EXTERNAL_SALT_LEN:
raise ValueError
return sectrue == self.lib.storage_unlock(pin.encode(), len(pin), ext_salt)
def lock(self) -> None:
self.lib.storage_lock()
def has_pin(self) -> bool:
return sectrue == self.lib.storage_has_pin()
def get_pin_rem(self) -> int:
return self.lib.storage_get_pin_rem()
def change_pin(
self,
oldpin: str,
newpin: str,
old_ext_salt: bytes = None,
new_ext_salt: bytes = None,
) -> bool:
if old_ext_salt is not None and len(old_ext_salt) != EXTERNAL_SALT_LEN:
raise ValueError
if new_ext_salt is not None and len(new_ext_salt) != EXTERNAL_SALT_LEN:
raise ValueError
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return sectrue == self.lib.storage_change_pin(
oldpin.encode(),
len(oldpin),
newpin.encode(),
len(newpin),
old_ext_salt,
new_ext_salt,
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)
def get(self, key: int) -> bytes:
val_len = c.c_uint16()
if sectrue != self.lib.storage_get(c.c_uint16(key), None, 0, c.byref(val_len)):
raise RuntimeError("Failed to find key in storage.")
s = c.create_string_buffer(val_len.value)
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if sectrue != self.lib.storage_get(
c.c_uint16(key), s, val_len, c.byref(val_len)
):
raise RuntimeError("Failed to get value from storage.")
return s.raw
def set(self, key: int, val: bytes) -> None:
if sectrue != self.lib.storage_set(c.c_uint16(key), val, c.c_uint16(len(val))):
raise RuntimeError("Failed to set value in storage.")
def set_counter(self, key: int, count: int) -> None:
if count > 0xFFFF_FFFF or sectrue != self.lib.storage_set_counter(
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c.c_uint16(key), c.c_uint32(count)
):
raise RuntimeError("Failed to set value in storage.")
def next_counter(self, key: int) -> int:
count = c.c_uint32()
if sectrue != self.lib.storage_next_counter(c.c_uint16(key), c.byref(count)):
raise RuntimeError("Failed to set value in storage.")
return count.value
def delete(self, key: int) -> bool:
return sectrue == self.lib.storage_delete(c.c_uint16(key))
def _dump(self) -> bytes:
# return just sectors 4 and 16 of the whole flash
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return [
self.flash_buffer[0x010000 : 0x010000 + 0x10000],
self.flash_buffer[0x110000 : 0x110000 + 0x10000],
]
def _get_flash_buffer(self) -> bytes:
return bytes(self.flash_buffer)
def _set_flash_buffer(self, buf: bytes) -> None:
if len(buf) != self.flash_size:
raise RuntimeError("Failed to set flash buffer due to length mismatch.")
self.flash_buffer.value = buf
def _get_active_sector(self) -> int:
if self._dump()[0][:8].hex() == consts.NORCOW_MAGIC_AND_VERSION.hex():
return 0
elif self._dump()[1][:8].hex() == consts.NORCOW_MAGIC_AND_VERSION.hex():
return 1
raise RuntimeError("Failed to get active sector.")