def find_block_size():
global key
if key is None:
key = crypto.generate_bytes(16)
# One block
len1 = len(crypto.encryption_oracle2(b'', key))
len2 = 0
i = 0
while len2 <= len1:
len2 = len(crypto.encryption_oracle2(bytearray([0] * i), key))
i += 1
len3 = len2 - len1
return len3
def find_block_size():
global key
if key is None:
key = crypto.generate_bytes(16)
# One block
len1 = len(crypto.encryption_oracle2(b'', key))
len2 = 0
i = 0
while len2 <= len1:
len2 = len(crypto.encryption_oracle2(bytearray([0] * i), key))
i += 1
len3 = len2 - len1
return len3
block_size = find_block_size()
print block_size
print 'Number of blocks: ' + str(len(crypto.encryption_oracle2(b'', key)) / block_size)
# Check for ECB
if crypto.score_ecb(crypto.encryption_oracle2(bytearray([0] * 47), key)) >= 1:
print "ECB"
discovered = ""
for n in range(1, len(crypto.encryption_oracle2(b'', key)) + 1):
discovered += crypto.brute_ecb_character2(crypto.encryption_oracle2, key, n, discovered)
print discovered
