def test_failed_pin(self):
        # external_entropy = b'zlutoucky kun upel divoke ody' * 2
        strength = 128

        ret = self.client.call_raw(
            proto.ResetDevice(
                display_random=True,
                strength=strength,
                passphrase_protection=True,
                pin_protection=True,
                language="english",
                label="test",
            )
        )

        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())

        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())

        assert isinstance(ret, proto.PinMatrixRequest)

        # Enter PIN for first time
        pin_encoded = self.client.debug.encode_pin(self.pin4)
        ret = self.client.call_raw(proto.PinMatrixAck(pin=pin_encoded))
        assert isinstance(ret, proto.PinMatrixRequest)

        # Enter PIN for second time
        pin_encoded = self.client.debug.encode_pin(self.pin6)
        ret = self.client.call_raw(proto.PinMatrixAck(pin=pin_encoded))

        assert isinstance(ret, proto.Failure)
    def test_reset_device_skip_backup_break(self):

        external_entropy = b'zlutoucky kun upel divoke ody' * 2
        strength = 128

        ret = self.client.call_raw(
            proto.ResetDevice(display_random=False,
                              strength=strength,
                              passphrase_protection=False,
                              pin_protection=False,
                              language='english',
                              label='test',
                              skip_backup=True))

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        ret = self.client.call_raw(proto.EntropyAck(entropy=external_entropy))
        assert isinstance(ret, proto.Success)

        # Check if device is properly initialized
        resp = self.client.call_raw(proto.Initialize())
        assert resp.initialized is True
        assert resp.needs_backup is True

        # start Backup workflow
        ret = self.client.call_raw(proto.BackupDevice())

        # send Initialize -> break workflow
        ret = self.client.call_raw(proto.Initialize())
        assert isinstance(resp, proto.Features)

        # start backup again - should fail
        ret = self.client.call_raw(proto.BackupDevice())
        assert isinstance(ret, proto.Failure)
def test_reset_device(client: Client):
    assert client.features.pin_protection is False
    assert client.features.passphrase_protection is False
    os_urandom = mock.Mock(return_value=EXTERNAL_ENTROPY)
    with mock.patch("os.urandom", os_urandom), client:
        client.set_expected_responses(
            [messages.ButtonRequest]
            + [messages.EntropyRequest]
            + [messages.ButtonRequest] * 24
            + [messages.Success, messages.Features]
        )
        device.reset(client, False, 128, True, False, "label", "en-US")

    with pytest.raises(TrezorFailure):
        # This must fail, because device is already initialized
        # Using direct call because `device.reset` has its own check
        client.call(
            messages.ResetDevice(
                display_random=False,
                strength=128,
                passphrase_protection=True,
                pin_protection=False,
                label="label",
                language="en-US",
            )
        )
    def test_reset_device_no_backup(self):

        ret = self.client.call_raw(
            proto.ResetDevice(
                display_random=False,
                strength=self.strength,
                passphrase_protection=False,
                pin_protection=False,
                language="english",
                label="test",
                no_backup=True,
            ))

        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        ret = self.client.call_raw(
            proto.EntropyAck(entropy=self.external_entropy))
        assert isinstance(ret, proto.Success)

        # Check if device is properly initialized
        ret = self.client.call_raw(proto.Initialize())
        assert ret.initialized is True
        assert ret.needs_backup is False
        assert ret.unfinished_backup is False
        assert ret.no_backup is True

        # start backup - should fail
        ret = self.client.call_raw(proto.BackupDevice())
        assert isinstance(ret, proto.Failure)
 def test_reset_device_skip_backup_show_entropy_fail(self, client):
     ret = client.call_raw(
         proto.ResetDevice(
             display_random=True,
             strength=self.strength,
             passphrase_protection=False,
             pin_protection=False,
             language="english",
             label="test",
             skip_backup=True,
         ))
     assert isinstance(ret, proto.Failure)
Пример #6
0
def test_reset_device_skip_backup_show_entropy_fail(client: Client):
    ret = client.call_raw(
        messages.ResetDevice(
            display_random=True,
            strength=STRENGTH,
            passphrase_protection=False,
            pin_protection=False,
            language="en-US",
            label="test",
            skip_backup=True,
        ))
    assert isinstance(ret, messages.Failure)
Пример #7
0
def test_reset_device_skip_backup_break(client):
    ret = client.call_raw(
        messages.ResetDevice(
            display_random=False,
            strength=STRENGTH,
            passphrase_protection=False,
            pin_protection=False,
            language="en-US",
            label="test",
            skip_backup=True,
        )
    )

    assert isinstance(ret, messages.ButtonRequest)
    client.debug.press_yes()
    ret = client.call_raw(messages.ButtonAck())

    # Provide entropy
    assert isinstance(ret, messages.EntropyRequest)
    ret = client.call_raw(messages.EntropyAck(entropy=EXTERNAL_ENTROPY))
    assert isinstance(ret, messages.Success)

    # Check if device is properly initialized
    ret = client.call_raw(messages.Initialize())
    assert ret.initialized is True
    assert ret.needs_backup is True
    assert ret.unfinished_backup is False
    assert ret.no_backup is False

    # start Backup workflow
    ret = client.call_raw(messages.BackupDevice())

    # send Initialize -> break workflow
    ret = client.call_raw(messages.Initialize())
    assert isinstance(ret, messages.Features)
    assert ret.initialized is True
    assert ret.needs_backup is False
    assert ret.unfinished_backup is True
    assert ret.no_backup is False

    # start backup again - should fail
    ret = client.call_raw(messages.BackupDevice())
    assert isinstance(ret, messages.Failure)

    # read Features again
    ret = client.call_raw(messages.Initialize())
    assert isinstance(ret, messages.Features)
    assert ret.initialized is True
    assert ret.needs_backup is False
    assert ret.unfinished_backup is True
    assert ret.no_backup is False
Пример #8
0
    def test_reset_device_skip_backup_break(self):

        ret = self.client.call_raw(
            proto.ResetDevice(
                display_random=False,
                strength=self.strength,
                passphrase_protection=False,
                pin_protection=False,
                language="english",
                label="test",
                skip_backup=True,
            )
        )

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        ret = self.client.call_raw(proto.EntropyAck(entropy=self.external_entropy))
        assert isinstance(ret, proto.Success)

        # Check if device is properly initialized
        ret = self.client.call_raw(proto.Initialize())
        assert ret.initialized is True
        assert ret.needs_backup is True
        assert ret.unfinished_backup is False
        assert ret.no_backup is False

        # start Backup workflow
        ret = self.client.call_raw(proto.BackupDevice())

        # send Initialize -> break workflow
        ret = self.client.call_raw(proto.Initialize())
        assert isinstance(ret, proto.Features)
        assert ret.initialized is True
        assert ret.needs_backup is False
        assert ret.unfinished_backup is True
        assert ret.no_backup is False

        # start backup again - should fail
        ret = self.client.call_raw(proto.BackupDevice())
        assert isinstance(ret, proto.Failure)

        # read Features again
        ret = self.client.call_raw(proto.Initialize())
        assert isinstance(ret, proto.Features)
        assert ret.initialized is True
        assert ret.needs_backup is False
        assert ret.unfinished_backup is True
        assert ret.no_backup is False
Пример #9
0
    def test_failed_pin(self):
        # external_entropy = b'zlutoucky kun upel divoke ody' * 2
        strength = 128
        ret = self.client.call_raw(
            proto.ResetDevice(strength=strength, pin_protection=True, label="test")
        )

        # Enter PIN for first time
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.input("654")
        ret = self.client.call_raw(proto.ButtonAck())

        # Enter PIN for second time
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.input("456")
        ret = self.client.call_raw(proto.ButtonAck())

        assert isinstance(ret, proto.ButtonRequest)
    def test_reset_device(self, client):
        with client:
            client.set_expected_responses(
                [proto.ButtonRequest()] + [proto.EntropyRequest()] +
                [proto.ButtonRequest()] * 24 +
                [proto.Success(), proto.Features()])
            device.reset(client, False, 128, True, False, "label", "en-US")

        with pytest.raises(TrezorFailure):
            # This must fail, because device is already initialized
            # Using direct call because `device.reset` has its own check
            client.call(
                proto.ResetDevice(
                    display_random=False,
                    strength=128,
                    passphrase_protection=True,
                    pin_protection=False,
                    label="label",
                    language="en-US",
                ))
Пример #11
0
    def test_failed_pin(self, client):
        # external_entropy = b'zlutoucky kun upel divoke ody' * 2
        strength = 128

        ret = client.call_raw(
            proto.ResetDevice(
                display_random=True,
                strength=strength,
                passphrase_protection=True,
                pin_protection=True,
                language="en-US",
                label="test",
            ))

        # Do you want ... ?
        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        # Entropy screen #1
        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        # Entropy screen #2
        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        assert isinstance(ret, proto.PinMatrixRequest)

        # Enter PIN for first time
        pin_encoded = client.debug.encode_pin("1234")
        ret = client.call_raw(proto.PinMatrixAck(pin=pin_encoded))
        assert isinstance(ret, proto.PinMatrixRequest)

        # Enter PIN for second time
        pin_encoded = client.debug.encode_pin("6789")
        ret = client.call_raw(proto.PinMatrixAck(pin=pin_encoded))

        assert isinstance(ret, proto.Failure)
Пример #12
0
def test_failed_pin(client: Client):
    # external_entropy = b'zlutoucky kun upel divoke ody' * 2
    strength = 128
    ret = client.call_raw(
        messages.ResetDevice(strength=strength,
                             pin_protection=True,
                             label="test"))

    # Confirm Reset
    assert isinstance(ret, messages.ButtonRequest)
    client.debug.press_yes()
    ret = client.call_raw(messages.ButtonAck())

    # Enter PIN for first time
    assert isinstance(ret, messages.ButtonRequest)
    client.debug.input("654")
    ret = client.call_raw(messages.ButtonAck())

    # Enter PIN for second time
    assert isinstance(ret, messages.ButtonRequest)
    client.debug.input("456")
    ret = client.call_raw(messages.ButtonAck())

    assert isinstance(ret, messages.ButtonRequest)
    def test_reset_device_pin(self, client):
        external_entropy = b"zlutoucky kun upel divoke ody" * 2
        strength = 128

        ret = client.call_raw(
            proto.ResetDevice(
                display_random=True,
                strength=strength,
                passphrase_protection=True,
                pin_protection=True,
                language="english",
                label="test",
            ))

        # Do you want ... ?
        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        # Entropy screen #1
        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        # Entropy screen #2
        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        assert isinstance(ret, proto.PinMatrixRequest)

        # Enter PIN for first time
        pin_encoded = client.debug.encode_pin("654")
        ret = client.call_raw(proto.PinMatrixAck(pin=pin_encoded))
        assert isinstance(ret, proto.PinMatrixRequest)

        # Enter PIN for second time
        pin_encoded = client.debug.encode_pin("654")
        ret = client.call_raw(proto.PinMatrixAck(pin=pin_encoded))

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        internal_entropy = client.debug.read_reset_entropy()
        ret = client.call_raw(proto.EntropyAck(entropy=external_entropy))

        # Generate mnemonic locally
        entropy = generate_entropy(strength, internal_entropy,
                                   external_entropy)
        expected_mnemonic = Mnemonic("english").to_mnemonic(entropy)

        mnemonic = []
        for _ in range(strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(client.debug.read_reset_word())
            client.debug.press_yes()
            client.call_raw(proto.ButtonAck())

        mnemonic = " ".join(mnemonic)

        # Compare that device generated proper mnemonic for given entropies
        assert mnemonic == expected_mnemonic

        mnemonic = []
        for _ in range(strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(client.debug.read_reset_word())
            client.debug.press_yes()
            resp = client.call_raw(proto.ButtonAck())

        assert isinstance(resp, proto.Success)

        mnemonic = " ".join(mnemonic)

        # Compare that second pass printed out the same mnemonic once again
        assert mnemonic == expected_mnemonic

        # Check if device is properly initialized
        resp = client.call_raw(proto.Initialize())
        assert resp.initialized is True
        assert resp.needs_backup is False
        assert resp.pin_protection is True
        assert resp.passphrase_protection is True

        # Do passphrase-protected action, PassphraseRequest should be raised
        resp = client.call_raw(proto.Ping(passphrase_protection=True))
        assert isinstance(resp, proto.PassphraseRequest)
        client.call_raw(proto.Cancel())
    def test_reset_device_skip_backup(self, client):
        ret = client.call_raw(
            proto.ResetDevice(
                display_random=False,
                strength=self.strength,
                passphrase_protection=False,
                pin_protection=False,
                language="english",
                label="test",
                skip_backup=True,
            ))

        assert isinstance(ret, proto.ButtonRequest)
        client.debug.press_yes()
        ret = client.call_raw(proto.ButtonAck())

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        internal_entropy = client.debug.read_reset_entropy()
        ret = client.call_raw(proto.EntropyAck(entropy=self.external_entropy))
        assert isinstance(ret, proto.Success)

        # Check if device is properly initialized
        ret = client.call_raw(proto.Initialize())
        assert ret.initialized is True
        assert ret.needs_backup is True
        assert ret.unfinished_backup is False
        assert ret.no_backup is False

        # Generate mnemonic locally
        entropy = generate_entropy(self.strength, internal_entropy,
                                   self.external_entropy)
        expected_mnemonic = Mnemonic("english").to_mnemonic(entropy)

        # start Backup workflow
        ret = client.call_raw(proto.BackupDevice())

        mnemonic = []
        for _ in range(self.strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(client.debug.read_reset_word())
            client.debug.press_yes()
            client.call_raw(proto.ButtonAck())

        mnemonic = " ".join(mnemonic)

        # Compare that device generated proper mnemonic for given entropies
        assert mnemonic == expected_mnemonic

        mnemonic = []
        for _ in range(self.strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(client.debug.read_reset_word())
            client.debug.press_yes()
            ret = client.call_raw(proto.ButtonAck())

        assert isinstance(ret, proto.Success)

        mnemonic = " ".join(mnemonic)

        # Compare that second pass printed out the same mnemonic once again
        assert mnemonic == expected_mnemonic

        # start backup again - should fail
        ret = client.call_raw(proto.BackupDevice())
        assert isinstance(ret, proto.Failure)
    def test_reset_device(self):

        # No PIN, no passphrase
        external_entropy = b"zlutoucky kun upel divoke ody" * 2
        strength = 128

        ret = self.client.call_raw(
            proto.ResetDevice(
                display_random=False,
                strength=strength,
                passphrase_protection=False,
                pin_protection=False,
                language="english",
                label="test",
            )
        )

        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        internal_entropy = self.client.debug.read_reset_entropy()
        ret = self.client.call_raw(proto.EntropyAck(entropy=external_entropy))

        # Generate mnemonic locally
        entropy = generate_entropy(strength, internal_entropy, external_entropy)
        expected_mnemonic = Mnemonic("english").to_mnemonic(entropy)

        mnemonic = []
        for _ in range(strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(self.client.debug.read_reset_word())
            self.client.debug.press_yes()
            self.client.call_raw(proto.ButtonAck())

        mnemonic = " ".join(mnemonic)

        # Compare that device generated proper mnemonic for given entropies
        assert mnemonic == expected_mnemonic

        mnemonic = []
        for _ in range(strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(self.client.debug.read_reset_word())
            self.client.debug.press_yes()
            resp = self.client.call_raw(proto.ButtonAck())

        assert isinstance(resp, proto.Success)

        mnemonic = " ".join(mnemonic)

        # Compare that second pass printed out the same mnemonic once again
        assert mnemonic == expected_mnemonic

        # Check if device is properly initialized
        resp = self.client.call_raw(proto.Initialize())
        assert resp.initialized is True
        assert resp.needs_backup is False
        assert resp.pin_protection is False
        assert resp.passphrase_protection is False

        # Do passphrase-protected action, PassphraseRequest should NOT be raised
        resp = self.client.call_raw(proto.Ping(passphrase_protection=True))
        assert isinstance(resp, proto.Success)

        # Do PIN-protected action, PinRequest should NOT be raised
        resp = self.client.call_raw(proto.Ping(pin_protection=True))
        assert isinstance(resp, proto.Success)
Пример #16
0
def reset_device(client: Client, strength):
    # No PIN, no passphrase
    external_entropy = b"zlutoucky kun upel divoke ody" * 2

    ret = client.call_raw(
        messages.ResetDevice(
            display_random=False,
            strength=strength,
            passphrase_protection=False,
            pin_protection=False,
            language="en-US",
            label="test",
        ))

    assert isinstance(ret, messages.ButtonRequest)
    client.debug.press_yes()
    ret = client.call_raw(messages.ButtonAck())

    # Provide entropy
    assert isinstance(ret, messages.EntropyRequest)
    internal_entropy = client.debug.state().reset_entropy
    ret = client.call_raw(messages.EntropyAck(entropy=external_entropy))

    # Generate mnemonic locally
    entropy = generate_entropy(strength, internal_entropy, external_entropy)
    expected_mnemonic = Mnemonic("english").to_mnemonic(entropy)

    mnemonic = []
    for _ in range(strength // 32 * 3):
        assert isinstance(ret, messages.ButtonRequest)
        mnemonic.append(client.debug.read_reset_word())
        client.debug.press_yes()
        client.call_raw(messages.ButtonAck())

    mnemonic = " ".join(mnemonic)

    # Compare that device generated proper mnemonic for given entropies
    assert mnemonic == expected_mnemonic

    mnemonic = []
    for _ in range(strength // 32 * 3):
        assert isinstance(ret, messages.ButtonRequest)
        mnemonic.append(client.debug.read_reset_word())
        client.debug.press_yes()
        resp = client.call_raw(messages.ButtonAck())

    assert isinstance(resp, messages.Success)

    mnemonic = " ".join(mnemonic)

    # Compare that second pass printed out the same mnemonic once again
    assert mnemonic == expected_mnemonic

    # Check if device is properly initialized
    resp = client.call_raw(messages.Initialize())
    assert resp.initialized is True
    assert resp.needs_backup is False
    assert resp.pin_protection is False
    assert resp.passphrase_protection is False

    # Do pin & passphrase-protected action, PassphraseRequest should NOT be raised
    resp = client.call_raw(
        messages.GetAddress(address_n=parse_path("m/44'/0'/0'/0/0")))
    assert isinstance(resp, messages.Address)
    def test_reset_device_pin(self):

        # PIN, passphrase, display random
        external_entropy = b'zlutoucky kun upel divoke ody' * 2
        strength = 128
        ret = self.client.call_raw(
            proto.ResetDevice(display_random=True,
                              strength=strength,
                              passphrase_protection=True,
                              pin_protection=True,
                              label='test'))

        # Enter PIN for first time
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.input('654')
        ret = self.client.call_raw(proto.ButtonAck())

        # Enter PIN for second time
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.input('654')
        ret = self.client.call_raw(proto.ButtonAck())

        # Confirm entropy
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        internal_entropy = self.client.debug.read_reset_entropy()
        ret = self.client.call_raw(proto.EntropyAck(entropy=external_entropy))

        # Generate mnemonic locally
        entropy = generate_entropy(strength, internal_entropy,
                                   external_entropy)
        expected_mnemonic = Mnemonic('english').to_mnemonic(entropy)

        # Safety warning
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())

        # List through mnemonic pages
        assert isinstance(ret, proto.ButtonRequest)
        self.client.transport.write(proto.ButtonAck())
        self.client.debug.press_yes()
        words = []
        time.sleep(1)
        words.extend(self.client.debug.read_reset_word().split())
        self.client.debug.swipe_down()
        time.sleep(1)
        words.extend(self.client.debug.read_reset_word().split())
        self.client.debug.swipe_down()
        time.sleep(1)
        words.extend(self.client.debug.read_reset_word().split())

        # Compare that device generated proper mnemonic for given entropies
        assert ' '.join(words) == expected_mnemonic

        # Confirm the mnemonic
        self.client.debug.press_yes()

        # Check mnemonic words
        time.sleep(1)
        index = self.client.debug.read_reset_word_pos()
        self.client.debug.input(words[index])
        time.sleep(1)
        index = self.client.debug.read_reset_word_pos()
        self.client.debug.input(words[index])
        ret = self.client.transport.read()

        # Safety warning
        assert isinstance(ret, proto.ButtonRequest)
        self.client.debug.press_yes()
        ret = self.client.call_raw(proto.ButtonAck())
        assert isinstance(ret, proto.Success)

        # Check if device is properly initialized
        resp = self.client.call_raw(proto.Initialize())
        assert resp.initialized is True
        assert resp.needs_backup is False
        assert resp.pin_protection is True
        assert resp.passphrase_protection is True
    def test_reset_device_skip_backup(self):

        external_entropy = b'zlutoucky kun upel divoke ody' * 2
        strength = 128

        ret = self.client.call_raw(
            proto.ResetDevice(display_random=False,
                              strength=strength,
                              passphrase_protection=False,
                              pin_protection=False,
                              language='english',
                              label='test',
                              skip_backup=True))

        # Provide entropy
        assert isinstance(ret, proto.EntropyRequest)
        internal_entropy = self.client.debug.read_reset_entropy()
        ret = self.client.call_raw(proto.EntropyAck(entropy=external_entropy))
        assert isinstance(ret, proto.Success)

        # Check if device is properly initialized
        resp = self.client.call_raw(proto.Initialize())
        assert resp.initialized is True
        assert resp.needs_backup is True

        # Generate mnemonic locally
        entropy = generate_entropy(strength, internal_entropy,
                                   external_entropy)
        expected_mnemonic = Mnemonic('english').to_mnemonic(entropy)

        # start Backup workflow
        ret = self.client.call_raw(proto.BackupDevice())

        mnemonic = []
        for _ in range(strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(self.client.debug.read_reset_word())
            self.client.debug.press_yes()
            self.client.call_raw(proto.ButtonAck())

        mnemonic = ' '.join(mnemonic)

        # Compare that device generated proper mnemonic for given entropies
        assert mnemonic == expected_mnemonic

        mnemonic = []
        for _ in range(strength // 32 * 3):
            assert isinstance(ret, proto.ButtonRequest)
            mnemonic.append(self.client.debug.read_reset_word())
            self.client.debug.press_yes()
            resp = self.client.call_raw(proto.ButtonAck())

        assert isinstance(resp, proto.Success)

        mnemonic = ' '.join(mnemonic)

        # Compare that second pass printed out the same mnemonic once again
        assert mnemonic == expected_mnemonic

        # start backup again - should fail
        ret = self.client.call_raw(proto.BackupDevice())
        assert isinstance(ret, proto.Failure)