mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-25 08:58:14 +00:00
97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
import ctypes as c
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import os
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EXTERNAL_SALT_LEN = 32
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sectrue = -1431655766 # 0xAAAAAAAAA
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fname = os.path.join(os.path.dirname(__file__), "libtrezor-storage.so")
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class Storage:
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def __init__(self) -> None:
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self.lib = c.cdll.LoadLibrary(fname)
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self.flash_size = c.cast(self.lib.FLASH_SIZE, c.POINTER(c.c_uint32))[0]
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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(
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self.flash_buffer
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)
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def init(self, salt: bytes) -> None:
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self.lib.storage_init(0, salt, c.c_uint16(len(salt)))
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def wipe(self) -> None:
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self.lib.storage_wipe()
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def unlock(self, pin: int, ext_salt: bytes = None) -> bool:
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if ext_salt is not None and len(ext_salt) != EXTERNAL_SALT_LEN:
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raise ValueError
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return sectrue == self.lib.storage_unlock(c.c_uint32(pin), ext_salt)
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def lock(self) -> None:
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self.lib.storage_lock()
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def has_pin(self) -> bool:
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return sectrue == self.lib.storage_has_pin()
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def get_pin_rem(self) -> int:
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return self.lib.storage_get_pin_rem()
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def change_pin(
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self,
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oldpin: int,
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newpin: int,
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old_ext_salt: bytes = None,
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new_ext_salt: bytes = None,
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) -> bool:
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if old_ext_salt is not None and len(old_ext_salt) != EXTERNAL_SALT_LEN:
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raise ValueError
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if new_ext_salt is not None and len(new_ext_salt) != EXTERNAL_SALT_LEN:
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raise ValueError
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return sectrue == self.lib.storage_change_pin(
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c.c_uint32(oldpin), c.c_uint32(newpin), old_ext_salt, new_ext_salt
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)
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def get(self, key: int) -> bytes:
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val_len = c.c_uint16()
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if sectrue != self.lib.storage_get(c.c_uint16(key), None, 0, c.byref(val_len)):
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raise RuntimeError("Failed to find key in storage.")
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s = c.create_string_buffer(val_len.value)
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if sectrue != self.lib.storage_get(
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c.c_uint16(key), s, val_len, c.byref(val_len)
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):
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raise RuntimeError("Failed to get value from storage.")
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return s.raw
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def set(self, key: int, val: bytes) -> None:
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if sectrue != self.lib.storage_set(c.c_uint16(key), val, c.c_uint16(len(val))):
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raise RuntimeError("Failed to set value in storage.")
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def set_counter(self, key: int, count: int) -> bool:
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return sectrue == self.lib.storage_set_counter(
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c.c_uint16(key), c.c_uint32(count)
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)
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def next_counter(self, key: int) -> int:
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count = c.c_uint32()
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if sectrue == self.lib.storage_next_counter(c.c_uint16(key), c.byref(count)):
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return count.value
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else:
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return None
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def delete(self, key: int) -> bool:
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return sectrue == self.lib.storage_delete(c.c_uint16(key))
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def _dump(self) -> bytes:
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# return just sectors 4 and 16 of the whole flash
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return [
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self.flash_buffer[0x010000 : 0x010000 + 0x10000],
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self.flash_buffer[0x110000 : 0x110000 + 0x10000],
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]
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def _get_flash_buffer(self) -> bytes:
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return bytes(self.flash_buffer)
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def _set_flash_buffer(self, buf: bytes) -> None:
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if len(buf) != self.flash_size:
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raise RuntimeError("Failed to set flash buffer due to length mismatch.")
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self.flash_buffer.value = buf
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