rev: add already solved challenges

This commit is contained in:
Oystein Kristoffer Tveit 2024-09-01 23:15:27 +02:00
parent 9f5d34fe87
commit b1c7b28af0
Signed by: oysteikt
GPG Key ID: 9F2F7D8250F35146
5 changed files with 342 additions and 0 deletions

58
rev/crackme_py/crackme.py Executable file
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#!/usr/bin/env nix-shell
#!nix-shell -i python3 -p python3
# Hiding this really important number in an obscure piece of code is brilliant!
# AND it's encrypted!
# We want our biggest client to know his information is safe with us.
bezos_cc_secret = "A:4@r%uL`M-^M0c0AbcM-MFE0g4dd`_cgN"
# Reference alphabet
alphabet = "!\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ"+ \
"[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"
def decode_secret(secret):
"""ROT47 decode
NOTE: encode and decode are the same operation in the ROT cipher family.
"""
# Encryption key
rotate_const = 47
# Storage for decoded secret
decoded = ""
# decode loop
for c in secret:
index = alphabet.find(c)
original_index = (index + rotate_const) % len(alphabet)
decoded = decoded + alphabet[original_index]
print(decoded)
def choose_greatest():
"""Echo the largest of the two numbers given by the user to the program
Warning: this function was written quickly and needs proper error handling
"""
user_value_1 = input("What's your first number? ")
user_value_2 = input("What's your second number? ")
greatest_value = user_value_1 # need a value to return if 1 & 2 are equal
if user_value_1 > user_value_2:
greatest_value = user_value_1
elif user_value_1 < user_value_2:
greatest_value = user_value_2
print( "The number with largest positive magnitude is "
+ str(greatest_value) )
# NOTE: replaced function
# choose_greatest()
decode_secret(bezos_cc_secret)

246
rev/keygenme_py/keygenme-trial.py Executable file
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#!/usr/bin/env nix-shell
#!nix-shell -i python3 -p python3 python3Packages.cryptography
#============================================================================#
#============================ARCANE CALCULATOR===============================#
#============================================================================#
import hashlib
from cryptography.fernet import Fernet
import base64
# GLOBALS --v
arcane_loop_trial = True
jump_into_full = False
full_version_code = ""
username_trial = "MORTON"
bUsername_trial = b"MORTON"
key_part_static1_trial = "picoCTF{1n_7h3_|<3y_of_"
key_part_dynamic1_trial = "xxxxxxxx"
key_part_static2_trial = "}"
key_full_template_trial = key_part_static1_trial + key_part_dynamic1_trial + key_part_static2_trial
star_db_trial = {
"Alpha Centauri": 4.38,
"Barnard's Star": 5.95,
"Luhman 16": 6.57,
"WISE 0855-0714": 7.17,
"Wolf 359": 7.78,
"Lalande 21185": 8.29,
"UV Ceti": 8.58,
"Sirius": 8.59,
"Ross 154": 9.69,
"Yin Sector CL-Y d127": 9.86,
"Duamta": 9.88,
"Ross 248": 10.37,
"WISE 1506+7027": 10.52,
"Epsilon Eridani": 10.52,
"Lacaille 9352": 10.69,
"Ross 128": 10.94,
"EZ Aquarii": 11.10,
"61 Cygni": 11.37,
"Procyon": 11.41,
"Struve 2398": 11.64,
"Groombridge 34": 11.73,
"Epsilon Indi": 11.80,
"SPF-LF 1": 11.82,
"Tau Ceti": 11.94,
"YZ Ceti": 12.07,
"WISE 0350-5658": 12.09,
"Luyten's Star": 12.39,
"Teegarden's Star": 12.43,
"Kapteyn's Star": 12.76,
"Talta": 12.83,
"Lacaille 8760": 12.88
}
def intro_trial():
print("\n===============================================\n\
Welcome to the Arcane Calculator, " + username_trial + "!\n")
print("This is the trial version of Arcane Calculator.")
print("The full version may be purchased in person near\n\
the galactic center of the Milky Way galaxy. \n\
Available while supplies last!\n\
=====================================================\n\n")
def menu_trial():
print("___Arcane Calculator___\n\n\
Menu:\n\
(a) Estimate Astral Projection Mana Burn\n\
(b) [LOCKED] Estimate Astral Slingshot Approach Vector\n\
(c) Enter License Key\n\
(d) Exit Arcane Calculator")
choice = input("What would you like to do, "+ username_trial +" (a/b/c/d)? ")
if not validate_choice(choice):
print("\n\nInvalid choice!\n\n")
return
if choice == "a":
estimate_burn()
elif choice == "b":
locked_estimate_vector()
elif choice == "c":
enter_license()
elif choice == "d":
global arcane_loop_trial
arcane_loop_trial = False
print("Bye!")
else:
print("That choice is not valid. Please enter a single, valid \
lowercase letter choice (a/b/c/d).")
def validate_choice(menu_choice):
if menu_choice == "a" or \
menu_choice == "b" or \
menu_choice == "c" or \
menu_choice == "d":
return True
else:
return False
def estimate_burn():
print("\n\nSOL is detected as your nearest star.")
target_system = input("To which system do you want to travel? ")
if target_system in star_db_trial:
ly = star_db_trial[target_system]
mana_cost_low = ly**2
mana_cost_high = ly**3
print("\n"+ target_system +" will cost between "+ str(mana_cost_low) \
+" and "+ str(mana_cost_high) +" stone(s) to project to\n\n")
else:
# TODO : could add option to list known stars
print("\nStar not found.\n\n")
def locked_estimate_vector():
print("\n\nYou must buy the full version of this software to use this \
feature!\n\n")
def enter_license():
user_key = input("\nEnter your license key: ")
user_key = user_key.strip()
global bUsername_trial
if check_key(user_key, bUsername_trial):
decrypt_full_version(user_key)
else:
print("\nKey is NOT VALID. Check your data entry.\n\n")
def check_key(key, username_trial):
global key_full_template_trial
if len(key) != len(key_full_template_trial):
return False
else:
# Check static base key part --v
i = 0
for c in key_part_static1_trial:
if key[i] != c:
return False
i += 1
# TODO : test performance on toolbox container
# Check dynamic part --v
if key[i] != hashlib.sha256(username_trial).hexdigest()[4]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[5]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[3]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[6]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[2]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[7]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[1]:
return False
else:
i += 1
if key[i] != hashlib.sha256(username_trial).hexdigest()[8]:
return False
return True
def decrypt_full_version(key_str):
key_base64 = base64.b64encode(key_str.encode())
f = Fernet(key_base64)
try:
with open("keygenme.py", "w") as fout:
global full_version
global full_version_code
full_version_code = f.decrypt(full_version)
fout.write(full_version_code.decode())
global arcane_loop_trial
arcane_loop_trial = False
global jump_into_full
jump_into_full = True
print("\nFull version written to 'keygenme.py'.\n\n"+ \
"Exiting trial version...")
except FileExistsError:
sys.stderr.write("Full version of keygenme NOT written to disk, "+ \
"ERROR: 'keygenme.py' file already exists.\n\n"+ \
"ADVICE: If this existing file is not valid, "+ \
"you may try deleting it and entering the "+ \
"license key again. Good luck")
def ui_flow():
intro_trial()
while arcane_loop_trial:
menu_trial()
# Encrypted blob of full version
full_version = \
b"""
gAAAAABgT_nv3JrW2AMPOanzoOatT8tWrZSH9V2-H_-sY8RFTh1Vr9guvCw3iIUq7eVs4IhR2u6bI_HkJm6u5VK99vYIKXfthUYjQRMNmo6uMwqdK8ZYm3wH3Z2BlFNmGxMSXKmFhDQujSexuuMg5ZFIb5VhyZeUY4R9KubbghdUIlZ2hBeCpxef_ioNjM7VUKJEyJgxiAtPdMKSgT8y-FJsikUsw9Scbe8nH-bC856u_mqk6AKQnORLmxfsJykFMFm-wOh-unFnUvg9HiT6lYXCrFnXNEFEnq5djwM9H4iRXYwyO4XdHEqVcodEyE3HoPFOh24R9ATElafkxty16jECSabI7k608v6sk2Pxd-EAI0XEtjlVE5Qz-qdnoTIXEXXbwK8Bpw33JwRGJs-WduRmF2G5qVVAGONjaAc9CPXhawUkf2_sNMlnq6lqn7sBb2K7BiqW2Efc88pzfsOYvGQC94CBBhIUQTePRcZ_bUbsDLR8PrWlNQ28Vt6P45URpPDtxkUGQtixiQi9QlPThCFJs28XmApvRQQfJHdje45t2ELeVgn5YMi_FHQ98qgMudwXHXprigHAMmcB2rFPWWhAQn4sIrdL2In424RWO0qOhd9IJrU7DldcrmOMyvpHV87HzVgsRnI97Hn-jiVi_FemDWAsDGFwjaGbrxWUfr01ienDjlrXc-NC2x1Tt6jTHiFb2LbUqzGyjJ-m-5eCuqr1zh8_oCypnBB79XuKMGlngql0NQVEReZ9pDZd3Iax0TJVM55luvuCpjolarAJXz28Ynt5et1DHfnAQ1gQ4laW3ZtRL6TTp1vRpfllOURLpAxNrY03a7cMS5iIS7nXMgllh-uV9S1O3Ww4z_nPSh3q-1yKUilHfuXwdazGjBvfvwDSD3ZgvzgDmvQ-eCNV4I-oEHlAjqAiuwMvClU3Pr-mmBg257A8LHQlJJ7Rl6oYpW-B43esP6sQ2G66ofHbx4ZyUhqH5WC6jjoSuxyRFs6Z6wiNDztgkSdqbSc7iTxtF8oHBqPI_boBwr7YskpWmgwNFhWPzxGwyhMI2H38WGx1klLhNKsa4Ep9vcTuj_ltCL_QZkIgfgklf3QYGWBNLjIPBPkv1c0GqYMPkhnc4Libqdr8LXZJug2ry1s-H16d2U7_cjo9d8usNG2nNhUQvJ8d5I58r3IlioEUWjkUfWy4t3Aw8UN43iZ62MyzE7yzNIYMIwIxgB9qXmrFkh3pFnoZKlPHh7rjVBlbsIgPl64Ewi70P2AdkuDe7BXQ6kX4rdWm3i18ePWIX8n0WYz4eyGz41eRXU2hjyJeIz4Wi0rcjx39LS9BXWq4qHYnT3WNGzONy1ArEiNNiXYk61CyJiaCmFX2BZ5NL85O0ePD-bf7cn7KIWvTGqUoXIP-j1FAYvJy47myTITkurZ7YwEHIAk2sejWMltN-JeI6Jqu8nFKTl1h1sbNpCvAnJmSFczKN9fTJONndpK_PpPbUIilA1UHeqtsQfhNpyx1KK6xeFYyCa0V2sLDnHIHWREXMgcB99TUYSV0_DpbIvwQIaINt7cTDQWWvD7tyFXWltw7VqGAUCgtWYAOIoXj9ZxyOCwuIBHXGD8h8r_kBWx8GlN2Mn70ALuVpPWfR_Y55SHGy3KEUtgig92ms5758hdTQjbvb9wk9byAXvAwpltWQG86XlCIIZSM2vpDqpQ6l-8j_BBir_oXjjuaHQKEw3A3ISpLTP9ZKqcRuDAyeiNNNO_HuPK8hxNFzy7Zvu46tH3waLaPW_v_OivUOx7rP8YxocSv6ON_lwR4sRj3mvAk_WPbXpGQaRaNL813pp5aPzOkUAuod25H6esLw0Io7nCirZ3ZhPKfhtY0bakpTl2o5JJGe_2eEm_D6afBnhnkpEaJOsJhkPj7BXBZH9VJJlBWsHOV8WM3sgy1dBQjCP4C0ThSBhEUwq1mPIFKsvffKJgianCnk0fdmpFOLDJci9i5LDAB-sra6RM4y-HhV2gt3PSvyB_H0WDcdQhSZHVz6U_yNMucIW8-4YwdRwec6HGrNneiyIlacHlKO15PCwWBogndUApfLYrxKHHbxIU1sDybMlIEgBBu9_3gOStqXZu4zBDR93P-qYGz-0jrEHq3YVN9olBLx9yoOVI2AZ9m0PJwpKHYc2uZsciFy__dckefZ79zycUzeSKuKbhaZozQOvdLKwmtcB8y5n3_nwwN6-FQu9APoLqsZoaq3wT5QM6ax-_FS9XwzhqEunognjINxAXu660db73L710noV3CBT76aDY3hiV7fnYhQTfysI4SHQtnAzHXMbxYmNfbMnOALTAkQt7Yaiy_NGAr7jmNOAQwhHIW8eaOsCfhRPl7XjdM7pX2N4EM5cFAEphKWQ62f_3RhnyvaTDNmDXkde-_2FjfBMGirouVJL2rSA-icdD1pfkCKO7U0An5V7AUKuYDTZXTXE4DFWUIq4K36jFmHJ9fwllHoe1_A22RuP4DHm4o7TYEJIeo5UvaVc9Lfd6edWIn8KqDzhTz6TZLWlSbK_RnZlpCv3rdibpHzE-epOv1y5pDv08R8jWnVzHv0c3DgfJzWknRd-S5hIIOd5FEyCAx4NpOqYJjpD109ijZLzDMxuvml8QJmX2tplAp-5xGGiVAFPLse1Vo95f5Wsh8KXwnbNjFQSYf8AgskPp_2spP7rBpVvDrn6HJp7TvQY6mNZMXgLOWy8WHynKESedYkD7iQSHwZ5iMvJTVLDHjYbll0PZyI-Tsy7Q9ZP4ysdzkL5TwGwHa53UhUsiLQmhpkht4dKg3kqq-pA-f5PwKOWKCsKwtUyGFvz9gL7yDNNQwNpSaN2vBy5U8ulVA8SooM9SwmelNHOKvF2rmy6nOQ8mzt-vnnKqCTnc_4VgNakpw86IQVsw7VGQEGTNLD8ULL8bFkSlfICvDQKSLOPONExox17G4YuXFRpDCGoK3KLbM4oKQCi9QWPOL0jhovl0zu1j-XIY7IA2SX4C_Ie9MV27amQi7mwFHYpj3081isJOZd_cUxszijjqOFI71IBeHwSHj5wOnWRUHVLk-aOCT_rKKpae6mPyL0uJsIS1s0B62scEcn0wFa90pjuARSPhc35VCA9TFDcq6W0tAi4aNNzT-vgv4NkqfR6hh_jqs0irQZj7jtUh4OGbkaZljMovt7UYBKd9L4m5gmh1w672_Oif5pDU3YXMdc4FSp39f1wWDvHz0Uw7grUTlvLL3ge6f-Elxe2c0n56nWxs4qo4rqGY9c5BuIFxly_6iymzec33Yo8r0_L5VIRIoWl6lcZq-uIRdTl8mzbVDEoU7r1P6mvg3xUfKfF-Q-XnlfV23XNLSuIF3JF78DkjkNxdOP9dM4dCHbexa5yKeNqAan6Rq7LCnlxTGqP_lxpJO4GvU6npINZ1qjp9ydUveK-Ya7o6rfJqN1GbITvUdaMOFq00OfOsKdZXn7gB_I6el_O-YKJcx3W2X_im81FwT_8P-zW_jEdO-lmztiEyVEvUOFJJfAm-K_G4-HEYzROMPrgof708fnnxDaWGiUi0AtJeEk4sHvf2PTiE0517FcKadlELd_4R-eLKk9Wwu24faJ_R0Ej8NinIbeqCUTb0LkIKa5ChJbL4nXs9f019rUFewPDJhpVLy4nJywzVou9_7-DCMxUT3ld1PjfumXvAbYejzN4Ubue-yfBwPFe_U2YoLM-CyCPNXCbP8WKzCzzNwCcLf8OcQ6gbsyhi0Ul9urHnqWK93qVmPZLEVG9QBEmKPtN6FNWtNIomFiLnl6C9dwbSCWxUJWU_dP7tmVzundLgQhiZhgQz2T7ffSf1aNGSR5hklFayb-MyfOJm46EPx1hVVgqIcdxg7Ko4gt6rpjwAYRQ==
"""
# Enter main loop
ui_flow()
if jump_into_full:
exec(full_version_code)

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rev/keygenme_py/solve.py Executable file
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#!/usr/bin/env nix-shell
#!nix-shell -i python3 -p python3
import hashlib
print("picoCTF{1n_7h3_|<3y_of_", end="")
username_trial = b'MORTON'
print(hashlib.sha256(username_trial).hexdigest()[4], end="")
print(hashlib.sha256(username_trial).hexdigest()[5], end="")
print(hashlib.sha256(username_trial).hexdigest()[3], end="")
print(hashlib.sha256(username_trial).hexdigest()[6], end="")
print(hashlib.sha256(username_trial).hexdigest()[2], end="")
print(hashlib.sha256(username_trial).hexdigest()[7], end="")
print(hashlib.sha256(username_trial).hexdigest()[1], end="")
print(hashlib.sha256(username_trial).hexdigest()[8], end="")
print("}")

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rev/transformation/enc Normal file
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灩捯䍔䙻ㄶ形楴獟楮獴㌴摟潦弸弰摤捤㤷慽

19
rev/transformation/solve.py Executable file
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#!/usr/bin/env nix-shell
#!nix-shell -i python3 -p python3
# enc = ''.join([chr((ord(flag[i]) << 8) + ord(flag[i + 1])) for i in range(0, len(flag), 2)])
def decrypt(enc):
result = []
for x in enc:
n = ord(x)
result.append(chr((n & 0xFF00) >> 8))
result.append(chr(n & 0xFF))
return "".join(result)
if __name__ == "__main__":
with open('enc') as file:
enc = file.read()
print(decrypt(enc))