def test_challenge13():
block_size = 16
marker = b'email='
lm = len(marker)
userInput1 = (block_size - lm) * b'A'
userInput2 = pad(b'admin', 16)
userInput3 = pad(b'user', 16)
enc_admin_block = getProfile(userInput1 + userInput2)[16:32]
test1 = profile_for(userInput1 + userInput2)
finder = getProfile(userInput1 + userInput3)[16:32]
res = b''
for i in range(16):
inp = i * b'A'
test = profile_for(inp)
encrypted = getProfile(inp)
if finder in encrypted:
mod_enc = encrypted[:-16] + enc_admin_block
res = checkProfile(mod_enc)
print("DONE")
break
print(res)
ass(b'role=admin' in res, 'Challenge 13')
def test_encr_decr_round():
padded = pad(text, 16)
ciphert = cbc_encrypt(iv, key, padded)
#print("ciphertext:", ciphert)
plaint = cbc_decrypt(iv, key, ciphert)
#print("plaintext:", plaint)
plaint = unpad(plaint)
assert_equals(plaint, text, "encrypt/decrypt round test")
def test_encr_decr_round_rnd_iv():
iv2 = bytearray(16)
iv2[0] = 1
padded = pad(text, 16)
ciphert = cbc_encrypt(iv2, key, padded)
#print("ciphertext:", ciphert)
plaint = cbc_decrypt(iv2, key, ciphert)
#print("plaintext:", plaint)
plaint = unpad(plaint)
assert_equals(plaint, text, "encrypt/decrypt round test - second IV")
def encrypt(binInput):
global key
if key == None:
key = getRandom(16)
binInput = binInput.replace(b';', b'').replace(b'=', b'')
inp = prep + binInput + app
inp = pad(inp, 16)
iv = getRandom(16)
return iv + cbc_encrypt(iv, key, inp)
def getProfile(email):
global key
profile = profile_for(email)
if type(profile) is not bytes:
try:
profile = profile.encode()
except:
profile = bytes(profile)
padded = pad(profile, 16)
return ecb_encrypt(key, padded)
def encryption_oracle(bin_input): global key global randomPad if key == None: key = getRandom(16) if randomPad == None: randomPad = getRandom(randint(1,16)) bin_input += appText padded = pad(randomPad + bin_input, 16) return ecb_encrypt(key, padded)
def encryption_oracle(bin_input): if type(bin_input) is not bytes: try: bin_input = bin_input.encode() except: pass key = getRandom(16) padded = randomPad(bin_input) algo = "ECB" if randint(0,1): padded = pad(padded, 16) out = ecb_encrypt(key, padded) else: algo = "CBC" iv = getRandom(16) padded = pad(padded, 16) out = cbc_encrypt(iv, key, padded) #print(algo, "encrypt") return out, algo
def encryption_oracle(bin_input): global key bin_input += appText padded = pad(bin_input, 16) return ecb_encrypt(key, padded)
def cbcEncryptIv(key, binInput): padded = pad(binInput, 16) iv = getRandom(16) cipher = cbc_encrypt(iv, key, padded) return iv + cipher