def encrypter():
plaintext = crypty.convert_b64_to_hex(plaintexts[randint(
0, len(plaintexts))])
#print plaintext.decode("hex")
iv = crypty.generate_key()
ciphertext = aes_cbc.infra.encrypt_manual(plaintext, key, iv)
return (iv, ciphertext)
def encryption_oracle(plaintext):
global KEY
global prefix
if KEY is None:
KEY = crypty.generate_key()
if prefix is None:
# I am getting integer between 0 to 100
prefix = crypty.generate_key(key_size=randint(0, 100))
print "[*] Using Prefix of size : %d" % (len(prefix) / 2)
plaintext = crypty.pad_pkcs_7(prefix + plaintext +
crypty.convert_b64_to_hex(suffix))
return aes_ecb.infra.encrypt(plaintext, KEY)
def solve():
ciphertext = crypty.convert_b64_to_hex(get_ciphertext())
## Test to check hamming distance
assert crypty.hamming_distance(crypty.a2h("this is a test"),
crypty.a2h("wokka wokka!!!")) == 37
key_size = xor_cipher.attacks.keysize_estimator(ciphertext, 2, 40)[0][1]
print "Trying for key size: %d" % (key_size)
key = xor_cipher.attacks.brute_force(ciphertext, key_len=key_size)
print "Found Key : %d : %s" % (len(crypty.h2a(key)), crypty.h2a(key))
plaintext = xor_cipher.infra.decrypt(ciphertext, key)
print "Plaintext : %s" % (crypty.h2a(plaintext))
def solve():
ciphertexts = []
for plaintext in plaintexts:
plaintext = crypty.convert_b64_to_hex(plaintext)
ciphertexts.append(aes_ctr.infra.encrypt(plaintext, key, 0))
return ciphertexts
def solve():
ciphertext = crypty.convert_b64_to_hex(get_ciphertexts())
key = crypty.a2h("YELLOW SUBMARINE")
iv = crypty.a2h("\x00" * 16)
print crypty.h2a(aes_cbc.infra.decrypt_manual(ciphertext, key, iv))
def get_plaintext():
fp = open("25.txt", "r")
ciphertext = crypty.convert_b64_to_hex("".join(
[l.strip() for l in fp.readlines()]))
return aes_ecb.infra.decrypt(ciphertext, crypty.a2h("YELLOW SUBMARINE"))
def solve():
ciphertext = crypty.convert_b64_to_hex("L77na/nrFsKvynd6HzOoG7GHTLXsTVu9qvY/2syLXzhPweyyMTJULu/6/kXX0KSvoOLSFQ==")
KEY = crypty.a2h("YELLOW SUBMARINE")
nounce = 0
print aes_ctr.infra.decrypt(ciphertext, KEY, nounce).decode("hex")
def solve():
ciphertext = crypty.convert_b64_to_hex(get_ciphertext())
key = crypty.a2h("YELLOW SUBMARINE")
plaintext = crypty.h2a(aes_ecb.infra.decrypt(ciphertext, key))
print plaintext
def encryption_oracle(plaintext):
global KEY
if KEY is None:
KEY = crypty.generate_key()
plaintext = crypty.pad_pkcs_7(plaintext+crypty.convert_b64_to_hex(suffix))
return aes_ecb.infra.encrypt(plaintext, KEY)