def encryptionOracle(data):
randomKey = Binary.random(8 * 16)
addBefore = Binary.random(random.randrange(5, 11) * 8)
addAfter = Binary.random(random.randrange(5, 11) * 8)
data = addBefore + data + addAfter
IV = Binary.random(8 * 16)
c = Crypto(data)
if random.randrange(2):
c.encAES_ECB(randomKey)
mode = 'ECB'
else:
c.encAES_CBC(randomKey, IV)
mode = 'CBC'
return (mode, c.data)
from Tools import Binary, Crypto
import random
# constant random key
randomKey = Binary.random(8 * 16)
def encryptionOracle(data):
extraData = Binary(
'Um9sbGluJyBpbiBteSA1LjAKV2l0aCBteSByYWctdG9wIGRvd24gc28gbXkgaGFpciBjYW4gYmxvdwpUaGUgZ2lybGllcyBvbiBzdGFuZGJ5IHdhdmluZyBqdXN0IHRvIHNheSBoaQpEaWQgeW91IHN0b3A/IE5vLCBJIGp1c3QgZHJvdmUgYnkK',
64)
data = data + extraData
c = Crypto(data)
c.encAES_ECB(randomKey)
return c.data
def __main__():
print(Crypto.decECB(encryptionOracle))
if __name__ == "__main__":
__main__()