def breakSingleByteXor(s):
l = [xor(s, chr(i) * len(s)) for i in range(256)]
scores = [score(l[i]) for i in range(256)]
return l[scores.index(max(scores))]
return chr(scores.index(max(scores)))
def AES_ECB_encrypt(key, data):
aes = AES.new(key, AES.MODE_ECB)
return aes.encrypt(data)
def Generate_Keystream(length, key, nonce):
keystream = ""
for i in range(length/16+1):
data = nonce + chr(i) + "\x00"*(8-len(chr(i)))
keystream += AES_ECB_encrypt(key, data)
return keystream
def AES_CTR(keystream, plaintext):
return xor(keystream, plaintext)
keystream = Generate_Keystream(max([len(i) for i in data]), key, nonce)
ciphertext = []
for plain in data:
ciphertext.append(AES_CTR(keystream, plain.decode("base64")))
keysize = min([len(i) for i in ciphertext])
ciphertext = [i[:keysize] for i in ciphertext]
blocks = []
for i in range(keysize):
blocks.append(''.join([j[i] for j in ciphertext]))
for j in ciphertext:
print xor((''.join([breakSingleByteXor(i) for i in blocks])),j)
def AES_CTR(keystream, plaintext): return xor(keystream, plaintext)
def AES_CTR(ciphertext, key, nonce): keystream = "" for i in range(len(ciphertext)/16+1): data = nonce + chr(i) + "\x00"*(8-len(chr(i))) keystream += AES_ECB_encrypt(key, data) return xor(keystream, ciphertext)