def decryptData(key, encryptedData):
"""Decrypts the apk data using the specified AES key"""
aes = AES.new(key, AES.MODE_ECB)
return ''.join(
util.unpad(aes.decrypt(c))
for c in util.chunk(encryptedData, constants.blockSize +
constants.paddingSize))
def decrypt(self, c: bytes):
blocks = []
for i in progressbar.progressbar(range(0, len(c), self.rsa.oblock_size)):
ciphertext_block = c[i:i + self.rsa.oblock_size]
block = self._decrypt_block(ciphertext_block)
blocks.append(block)
return unpad(b"".join(blocks))
def decrypt_filename(self, cipher, key):
""" Decrypts filename using AES in ECB mode """
AES_cipher = AES.new(key, AES.MODE_ECB)
name = AES_cipher.decrypt(
bytes.fromhex(util.remove_cipher_extension(cipher)))
return util.unpad(name).decode()
def bitmap_to_mtn_pixels(self):
# 1. Rotate it to the left, because the pixels need to be structured as height slices
# 2. Bitmaps are bottom to top, and mountains are top to bottom, so reverse/mirror the array
# 3. Remove the sky pixels from the maxtrix rows.
positioned_matrix = mirror_array(
rotate_matrix_90_degrees_left(self.bitmap_struct.pixels))
return unpad(positioned_matrix, self.sky_palette_value)
def parse_decrypt_do87(self,rapdu):
"""
decrypt a do87 object if contained in the (encrypted) response apdu
:param rapdu: the encrypted response apdu
:return: the decrypted data
"""
if(not rapdu[0] == 0x87):
if(self.debug):
self.__trace_response(None)
return None
else:
head, enc_data = dec_ber_tlv_len(rapdu[1:])
data = unpad(self.des3dec(enc_data[1:]))
if(self.debug):
self.__trace_response(data)
return data
def decrypt_file(self, path, key, res_path, force):
""" Decrypts the file located in <path> and stores it as res_path/<encrypted file name>
File names are encrypted using the same <name_iv> stored is the <CREDENTIALS> folder """
cipher = util.get_file_bytes(path)
# encrypted file == 16B IV | xB encrypted file content
iv = cipher[:backup_client.IV_SIZE]
cipher = cipher[backup_client.IV_SIZE:]
AES_cip = AES.new(key, AES.MODE_CBC, iv)
plain = bytes(AES_cip.decrypt(cipher))
plain = util.unpad(plain)
res_name = self.decrypt_filename(
util.remove_cipher_extension(util.get_file_name(path)), key)
util.write_file_bytes(plain, res_path, res_name, force)
return res_name
def decryptData(key, encryptedData): """Decrypts the apk data using the specified AES key""" aes = AES.new(key, AES.MODE_ECB) return ''.join(util.unpad(aes.decrypt(c)) for c in util.chunk(encryptedData, constants.blockSize + constants.paddingSize))
