# python-validity
Validity fingerprint sensor driver.

## Setting up

On Ubuntu system:
```
$ sudo apt remove fprintd
$ sudo add-apt-repository ppa:uunicorn/open-fprintd
$ sudo apt-get update
$ sudo apt install open-fprintd fprintd-clients python3-validity
...wait a bit...
$ fprintd-enroll
```

## Playground

This package contains a set of scripts you can use to do a low-level debugging of the sensor protocol.
Here is a couple of examples of how you can use them.
Before using the scripts, make sure you've disabled the dbus service shipped with this package.
All examples assume that you are in `/usr/share/python-validity/playground/` directory and your device is already paired.

### Initialize a session
Before talking to a device you will need to open it and start a new TLS session
```
$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17) 
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from prototype import *
>>> open9x()
>>>
```

### Enroll a new user
Note: 0xf5 == WINBIO_FINGER_UNSPECIFIED_POS_01 (see [ms docs](https://docs.microsoft.com/en-us/windows/desktop/SecBioMet/winbio-ansi-381-pos-fingerprint-constants))
```
>>> db.dump_all()
 8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
     9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
>>> enroll(sid_from_string('S-1-5-21-394619333-3876782012-1672975908-3333'), 0xf5)
Waiting for a finger...
Progress: 14 % done
Progress: 28 % done
Progress: 42 % done
Progress: 57 % done
Progress: 71 % done
Progress: 85 % done
Progress: 100 % done
All done
11
>>> db.dump_all()
 8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
     9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 1 fingers:
    11: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
>>> 
```

### Delete database record (user/finger/whatever)
```
>>> db.dump_all()
 8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
     9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 1 fingers:
    11: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
>>> db.del_record(11)
>>> db.dump_all()
 8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
     9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 0 fingers:
>>> 
```

### Identify a finger (scan)
```
>>> identify()
Recognised finger f5 (WINBIO_FINGER_UNSPECIFIED_POS_01) from user S-1-5-21-111111111-1111111111-1111111111-1000
Template hash: 36bc1fe077e59a3090c816fcf2798c30a85d8a8fbe000ead5c6a946c3bacef7b
```

## DBus service

When started, DBus service will first try to initialize the device, then it will try to register itself with the
[open-fprintd](https://github.com/uunicorn/open-fprintd) service. If `open-fprintd` is not available it will wait for it
to come up.

To start DBus service from the sources (useful for debugging):
```
PYTHONPATH=. ./dbus_service/dbus-service
```


## Debugging
If you are curious you can enable tracing to see what flows in and out of device before and after encryption
```
>>> tls.trace_enabled=True
>>> usb.trace_enabled=True
>>> db.dump_all()
>tls> 17: 4b00000b0053746757696e64736f7200
>cmd> 1703030050c00a7ff1cf76e90f168141b4bc519ca9598eacb575ff01b7552a3707be8506b246d5272cb119e7b8b3eccd991cb7d8387245953ff1da62cebfb07fae7e47b9b536fb1a82185cc9399d30625ee3c1451f
<cmd< 1703030050b7a4a39e256bbe5a2589a6fbeec86057bead96f0b79ab6657dd9e851efaccddf9cd0108865aa98c510a1f8cd9b881b3166db553e5b4330c437f09daccbe261b259019774466ddb0d7f97fa67b6337329
<tls< 17: 0000030002000b00000008004c000a004c0053746757696e64736f7200
>tls> 17: 4a080000000000
>cmd> 1703030040ef982e5d6c403ff636c44cd53e7d0f98c21f67ff3b5b80f53555e4547028bd4d17cf5b0539ac0489238f1f066b8ba849120380cf979088d6c63249c873868c95
<cmd< 1703030090f16f4ed027f50103d5cf274a59323e5f25e084e21e4d42d4eab23abc867504ef80a700c775f03c0fafabee2e373fbf551d46e53ca957b86c53853a913e11c8cab98df41afc86af883b4e1b817024b212dbcdf1057a3bcdbc474381c5a5c37162167ff395e8102902c4e0d00b9b4931f0fa986ec3257c6bf2a5b55ea0b5349c035c20ed583522ac7ef9048e97a589a25e
<tls< 17: 00000800010000004c000900f5000300780b030000001c000000010500000000000515000000c76b9f06c7353a42c7353a42e803000000000000000000000000000000000000000000000000000000000000000000000000000000000000
>tls> 17: 4a0a0000000000
>cmd> 1703030040b522c55b73480e0d71a322abf8b65d97c9b55e9930206c463f998886cda4410d1b00ab41ec5b213d2ac18bf3bf61ce817446f27d643f99aba5a1d4cb80d18461
<cmd< 170303009061cef46670a21ca87043f1f4d55153eb46a19757de767d4ddbee736e2a775af63850a89ebe814b7e578979f1fb8a1c2133e0c6fa5b468cff9c731ef3f178b33334bdf64c03903dc2d95e9a16c656f1f8d06fa3431c3971607fec56f104ec7d4e73518705a289fac53fe54ddf33b30dad2b8c1fac67b7decf8c7f86dd843414e7f056a2ea8366611e5094c5491d5ade46
<tls< 17: 00000a00000000004c00030000001c000000010500000000000515000000c5698517bcff12e72496b763050d000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 8: User S-1-5-21-111111111-1111111111-1111111111-1000 with 1 fingers:
     9: f5 (WINBIO_FINGER_UNSPECIFIED_POS_01)
10: User S-1-5-21-394619333-3876782012-1672975908-3333 with 0 fingers:
>>> 
```