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Emoji Stack - CACI

Description

Welcome to Emoji Stack, the brand new stack based emoji language! Instead of other stack based turing machines that use difficult to read and challenging characters like + - and [], Emoji Stack uses our proprietary patent pending emoji system. The details of our implentation is below

  • 👉: Move the stack pointer one cell to the right
  • 👈: Move the stack pointer one cell to the left
  • 👍: Increment the current cell by one, bounded by 255
  • 👎: Decrement the current cell by one, bounded by 0
  • 💬: Print the ASCII value of the current cell
  • 🔁##: Repeat the previous instruction 0x## times

The Emoji Stack is 256 cells long, with each cell supporting a value between 0 - 255.

As an example, the program "👍🔁47💬👉👍🔁68💬👉👍🔁20💬" Would output "Hi!" with the following execution flow:

[0, 0, 0, 0]
👍🔁47
[0x48, 0, 0, 0]
💬👉: H
[0x48, 0, 0, 0]
👍🔁68
[0x48, 0x69, 0, 0]
💬👉: i
[0x48, 0x69, 0, 0]
👍🔁20
[0x48, 0x69, 0x21, 0]
💬: !

Difficulty

4/10

Flag

CACI{TUR!NG_!5_R011!NG_!N_H!5_GR@V3}

Author

Matthew Johnson (meatball5201)

Provide

input.txt

Tester

james

Writeup

Cross-compiled to brainfuck w/solve.py. Ran on https://copy.sh/brainfuck/