def main():
if len(sys.argv) < 3:
key = SAMPLE_KEY
filename = SAMPLE_FILENAME
else:
key = sys.argv[1]
filename = sys.argv[2]
f = open(filename, "r")
ciphertext = ""
for line in f:
ciphertext += common.b64decode(line.rstrip())
print common.aes_cbc_decrypt(ciphertext, key, "\x00" * 16)
if False:
for _ in range(1000):
key = common.randbytes(16)
pt = common.randbytes(random.randint(1, 64))
iv = common.randbytes(16)
AFTER = binascii.hexlify(common.aes_cbc_decrypt(common.aes_cbc_encrypt(pt, key, iv), key, iv))
PT = binascii.hexlify(common.pkcs7_pad(pt, len(pt) + (16 - (len(pt) % 16))))
print PT == AFTER
def decryption_oracle(ct, IV):
global key
try:
pt = common.aes_cbc_decrypt(ct, key, IV)
unpadpt = common.unpad(common.aes_cbc_decrypt(ct, key, IV), 16)
except common.InvalidPaddingError as e:
return False
# print hex(ord(pt[-1]))
return True
def decryption_oracle(ct, IV):
global key
try:
pt = common.aes_cbc_decrypt(ct, key, IV)
unpadpt = common.unpad(common.aes_cbc_decrypt(ct, key, IV), 16)
except common.InvalidPaddingError as e:
return False
# print hex(ord(pt[-1]))
return True
def decryption_oracle(ct):
global key
global IV
try:
t = common.aes_cbc_decrypt(ct, key, IV).index(";admin=true;")
except:
return False
return True
def decryption_oracle(ct):
global key
global IV
try:
t = common.aes_cbc_decrypt(ct, key, IV).index(";admin=true;")
except:
return False
return True
