Welcome to lance1!
-----
We have implemented a rudimentary class system in C, but somehow
our internal logic is missing. So there is this binary which has
several functions (and none of them are called anywhere). You have
to figure out, what the functions are doing and insert function
calls to execute the actions described below. To patch the binary,
simply put the address of the function to call and it's arguments
in the patches.yaml file in the following format:
```
- - <func-addr>
- - <arg 1>
- <arg 2>
- <arg 3>
...
```
Arguments can be addresses or numbers. Afterwards, run patch.py
which will generate a new binary called `patched` with the new
calls in it.
```
$ ./patch.py
$ ./patched
```
To get the flag, call the right functions with the correct
arguments in the described order and provide the execution hash
to `get_token`.
You should "implement" the following actions:
John prints the information about his account. After he
recognizes that he has not enough money on it, he deposits
another 25€.
Felicity transfers some money to Laurel, so that their accounts
have the exact same balance.
John, Felicity and Laurel all check (in this order) their
new balances.
The flag is also the password for lance2.
Hints
-----
You don't need to reverse the functions updateExecutionHash, printExcHash, argHashToSign, appendArgToSign.
Just skip calls to them, since they are only needed to check which functions you've called.
