# Emulator

A python emulator of a single card.

- CVC: 123456
- **TAPSIGNER<sup>&reg;</sup>** AES key: 41414141414141414141414141414141
- Precise error codes will differ from real product
- _Completely_ insecure
- Uses `wallycore` dependency for Bitcoin math (required dependencies are `automake` & `swig` you may also need `gsed` on MacOS)
- Code is stand-alone, independent of `cktap`

## Usage

```
Usage: ecard.py [OPTIONS] COMMAND [ARGS]...

Options:
  -q, --quiet             Less debugging
  -t, --testnet           Operate on testnet3 rather than mainnet
  -r, --rng-seed integer  Seed value for (not) RNG
  --help                  Show this message and exit.

Commands:
  emulate    Emulate a card which has just powered on after CAP loaded.
  satscard   Build a SATSCARD and do the basics with it.
  tapsigner  Build a TAPSIGNER card and do the basics with it.
```

Command usage:

```shell
# emulate a factory-fresh card
% ./ecard.py emulate -f
```

```shell
# emulate a SATSCARD with first slot populated, certificate chain installed
% ./ecard.py emulate
```

```shell
# emulate a TAPSIGNER with no key picked yet
% ./ecard.py emulate -t --no-init
```

```shell
# emulate a TAPSIGNER with key already picked
% ./ecard.py emulate -t
```

When emulating a card, commands can be sent to the Unix domain pipe
at `/tmp/ecard-pipe` as CBOR objects. Responses are CBOR to be decoded.