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Author SHA1 Message Date
3eb81a5127 166 2023-08-25 00:24:12 +02:00
6d3720b0f9 156 2023-08-25 00:20:15 +02:00
5 changed files with 71 additions and 1 deletions

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@ -8,3 +8,11 @@ The folder name is the challenge id, as found in the URL (<https://play.picoctf.
Inside the folder there is an `inputs` subfolder which just includes all the files from the challenge description. Inside the folder there is an `inputs` subfolder which just includes all the files from the challenge description.
Executing `nix run .#CHALLENGE_ID` runs the challenge. Executing `nix run .#CHALLENGE_ID` runs the challenge.
## 156 - "Nice netcat..."
```txt
nc mercury.picoctf.net 49039
```
Output is in ASCII. Convert to text.

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@ -0,0 +1 @@
gAAAAABgUAIV8D5MJdzgLLTkkMlbU84ARVwfX4brMt2rJQCjkpLItytfWVZe1L2dp4K8VrKgRU3axStKJEAqcM0iDaxiYE54Boh8UfAAo1RNifKnlDrFz0gLaznVSFVj2xAUa4V35180

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@ -0,0 +1 @@
68f88f9368f88f9368f88f9368f88f93

60
exercises/166/main.py Normal file
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@ -0,0 +1,60 @@
import sys
import base64
from cryptography.fernet import Fernet
usage_msg = "Usage: "+ sys.argv[0] +" (-e/-d) [file]"
help_msg = usage_msg + "\n" +\
"Examples:\n" +\
" To decrypt a file named 'pole.txt', do: " +\
"'$ python "+ sys.argv[0] +" -d pole.txt'\n"
if len(sys.argv) < 2 or len(sys.argv) > 4:
print(usage_msg)
sys.exit(1)
if sys.argv[1] == "-e":
if len(sys.argv) < 4:
sim_sala_bim = input("Please enter the password:")
else:
sim_sala_bim = sys.argv[3]
ssb_b64 = base64.b64encode(sim_sala_bim.encode())
c = Fernet(ssb_b64)
with open(sys.argv[2], "rb") as f:
data = f.read()
data_c = c.encrypt(data)
sys.stdout.write(data_c.decode())
elif sys.argv[1] == "-d":
if len(sys.argv) < 4:
sim_sala_bim = input("Please enter the password:")
else:
sim_sala_bim = sys.argv[3]
ssb_b64 = base64.b64encode(sim_sala_bim.encode())
c = Fernet(ssb_b64)
with open(sys.argv[2], "r") as f:
data = f.read()
data_c = c.decrypt(data.encode())
sys.stdout.buffer.write(data_c)
elif sys.argv[1] == "-h" or sys.argv[1] == "--help":
print(help_msg)
sys.exit(1)
else:
print("Unrecognized first argument: "+ sys.argv[1])
print("Please use '-e', '-d', or '-h'.")

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@ -20,7 +20,7 @@
packages.${system} = forAllExercises ( packages.${system} = forAllExercises (
exercise: exercise:
pkgs.writers.writePython3Bin "picoCTF_${exercise}" { pkgs.writers.writePython3Bin "picoCTF_${exercise}" {
#libraries = with pkgs.python3.pkgs; [requests]; libraries = with pkgs.python3.pkgs; [cryptography];
} "${builtins.readFile ./exercises/${exercise}/main.py}" } "${builtins.readFile ./exercises/${exercise}/main.py}"
); );