def handle_request(self, request_: Request):
"""
Encrypts either the given string or file
:param request_: a Request
:return: a tuple
"""
print("Encrypting...")
key = DesKey(request_.key.encode('utf-8'))
if request_.data_input and request_.input_file:
return "Choose either a text file or a string to encrypt!!", False
elif request_.data_input:
request_.result = key.encrypt(request_.data_input.encode('utf-8'),
padding=True)
if not self.next_handler:
return "", True
return self.next_handler.handle_request(request_)
elif request_.input_file:
with open(request_.input_file, 'r') as file:
data = file.read()
request_.result = key.encrypt(data.encode('utf-8'),
padding=True)
if not self.next_handler:
return "", True
return self.next_handler.handle_request(request_)
else:
return self.next_handler.handle_request(request_)
def handle_request(self, request: Request):
"""
handles encryption depending on the type of input source.
:param request: Request
:return: self.next_handler
"""
print("Encryption handler running...")
byte_key = request.key.encode()
key = DesKey(byte_key)
if request.data_input:
print("Encrypting from the string passed...")
byte_str = request.data_input.encode()
request.result = key.encrypt(
byte_str,
padding=True) # automatically sets the length to 8, 16 or 24.
else:
print("Encrypting from the file...")
with open(request.input_file) as file:
byte_str = file.read().encode()
request.result = key.encrypt(byte_str, padding=True)
if not self.next_handler:
return
else:
self.next_handler.handle_request(request)
def des3():
mode = input("Input mode - e or d: ")
key0 = input("Input a key with length 24: \n")
keys = seperateKey(key0)
key1 = DesKey(keys[0].encode())
key2 = DesKey(keys[1].encode())
key3 = DesKey(keys[2].encode())
if(mode=="e"):
data = input("Input data: \n")
s1 = key1.encrypt(data.encode(), padding=True)
s2 = key2.decrypt(s1, padding=True)
s3 = key3.encrypt(s2, padding=True)
f = open("ciphertext", "wb")
f.write(s3)
print("Encryption done")
elif(mode=="d"):
filename = input("ciphertext filename: ")
f = open(filename, "rb")
lines = f.readlines()
s3 = key3.decrypt(lines[0], padding=True)
s2 = key2.encrypt(s3, padding=True)
s1 = key1.decrypt(s2, padding=True)
print(s1)
else:
print("Mode not supported")
def DESBlackbox(
): # Code that generates the plaintext, ciphertext for our attack the inner workings of this code would be hidden in a real scenario, we will treat this as blackbox
firstK = DesKey(
BitArray(formatKey(BitArray(hex="aaaaaaaa0001b1").bin)).tobytes())
secondK = DesKey(
BitArray(formatKey(BitArray(hex="aaaaaaaa001a1a").bin)).tobytes())
p1 = "0123456789ABCDEF"
p2 = "A01B23C45D67E89F"
c1 = secondK.encrypt(firstK.encrypt(p1))
c2 = secondK.encrypt(firstK.encrypt(p2))
plaincipher.append((p1, c1))
plaincipher.append((p2, c2))
def handle(self, request) -> bool:
encoding_key = DesKey(bytes(request.key, "utf8"))
if request.data_input is not None:
request.result = encoding_key.encrypt(bytes(
request.data_input, "utf8"),
padding=True)
elif request.input_file is not None:
file = open(request.input_file, "r")
request.result = encoding_key.encrypt(bytes(file.read(), "utf8"),
padding=True)
file.close()
if not self.next_handler:
return True
return self.next_handler.handle(request)
def verify(k1, k2):
p, c = plaincipher[1]
print("Verify Keys using second plaintext Ciphertext pair")
print("Plaintext 2 = " + p)
print("Ciphertext 2 =" + c)
key1 = DesKey(BitArray(formatKey(k1.bin)).tobytes())
key2 = DesKey(BitArray(formatKey(k2.bin)).tobytes())
c1 = key2.encrypt(key1.encrypt(p))
if (c1 == c):
print("Verified key pair using second plaintext ciphertext pair :")
print(k1 + "\n")
print(k2 + "\n")
return True
else:
return False
class DES:
def __init__(self, key):
key = key.to_bytes(24, byteorder='big')
self.key = key
self.create_cipher()
def create_cipher(self):
# try:
# key2 = DES3.adjust_key_parity(self.key)
# except ValueError:
# pass
# self.cipher = DES3.new(key1, DES3.MODE_CFB)
# print(self.key)
# key2=pad(self.key,24)
# print(key2)
assert (len(self.key) == 24)
self.key1 = DesKey(self.key)
# print(self.key1.is_triple())
def encryption(self, data, file=None):
if file == None:
data = data.encode(FORMAT)
cipher_text = self.key1.encrypt(data, padding=True)
return cipher_text
def decryption(self, data, file=None):
plain_text = self.key1.decrypt(data, padding=True)
if file == None:
plain_text = plain_text.decode(FORMAT)
return plain_text
def decrypt_txt():
"""
This function decrypts the text that was previously encrypted by first
encrypting it again and then calling decrypt() to decrypt and display the
decrypted text to the decrypt_txt_lb()
"""
key = ent_choose_key.get() # Get key from the user
# Check to see if the key is of valid length
if len(key) == 8 or len(key) == 16 or len(key) == 24:
# Clear error label is condition is mer
error_lbl['text'] = ''
# Convert the key from a string to a bytes format
key2 = key.encode()
# Create DesKey() instance
key2 = DesKey(key2)
# Encrypt message
decrypted_txt = ent_encrypt.get().encode()
decrypted_txt = key2.encrypt(decrypted_txt, padding=True)
# Decrypt message
message = key2.decrypt(decrypted_txt, padding=True)
message = str(message)
message = message[2:]
message = message[:len(message) - 1]
# Pass the message to the label to display to user
decrypted_txt_lbl["text"] = f"Decrypted String: {message}"
print(message)
else:
error_lbl['text'] = 'PLEASE MAKE SURE YOUR KEY IS OF LENGTH 8, ' \
'16, OR 24!'
def example():
send_message("\nFor this quick example of encryption, I'll need you to type a word. Any word!\n")
send_message("Enter it here: ")
word_received = c.recv(1024)
# clean up input with regex
word_received = re.sub(r'[b\'(.*?)\\r\\n\']', '', str(word_received))
if word_received == "":
send_message("Oops! You didn't enter anything, let's try again.\n")
example()
else:
genDESKey()
f = open("DESkey.txt", "r")
key_from_file = str.encode(f.read())
key0 = DesKey(key_from_file)
word_received = bytes(word_received, 'latin-1')
encrypted_word = key0.encrypt(word_received, padding=True)
substring = re.search(r"b'(.*?)'", str(encrypted_word)).group(1)
send_message("\nYour word, encrypted, looks like this: " + substring + "\n\n")
sleep(7)
send_message("Pretty hard to read, right? It was encrypted using a popular algorithm called DES, \n")
send_message("which stands for \"data encryption standard\".\n\n")
sleep(7)
return encrypted_word
def encryptage(data, key):
ndata = data.encode('utf-8')
key = parsekey(key)
nkey = key.encode('utf-8')
key0 = DesKey(nkey)
encrypted_message = key0.encrypt(ndata, padding=True)
return encrypted_message
class Encryption:
def __init__(self, password):
"""
Выполняет инициализацию шифрования
:param password: Пароль для защиты
"""
self._des = DesKey(password.encode('utf8'))
def encrypt(self, text) -> str:
"""
Шифрует строку
:param text: Строка для шифрования
:return: base64 результат
"""
return b64encode(self._des.encrypt(text.encode('utf8'),
padding=True)).decode('utf8')
def decrypt(self, text) -> str:
"""
Расшифровывает строку
:param text: Строка для расшифровки
:return: Результат
"""
return self._des.decrypt(b64decode(text.encode('utf8')),
padding=True).decode('utf8')
def confirmkey(self):
pin2 = self.pin_text.toPlainText()
pad_text = pad(pin2)
b = bytes(pad_text, 'utf-8')
key0 = DesKey(b)
enteredkey = key0.encrypt(b"teamhellowworld", padding=True)
#with open("keyenter.bytes","wb") as fp:
# fp.write(enteredkey)
with open("keyenter.bytes", "rb") as fp:
readkey = fp.read()
print("pin entered:" + pin2)
if enteredkey == readkey:
for file in os.listdir(self.storage_path):
full_path = os.path.join(self.storage_path, file)
os.chmod(full_path, S_IWRITE)
self.info.append("correct password")
print("Correct password")
return 1
else:
for file in os.listdir(self.storage_path):
full_path = os.path.join(self.storage_path, file)
os.chmod(full_path, S_IREAD)
self.info.append("wrong password")
print("Wrong password")
return 0
class DES:
def __init__(self, key_size, blocklength):
if key_size != 64:
raise InvalidKeyLength("Keylength of DES must be 64 bits!")
if blocklength % 64 != 0:
raise InvalidCipherBlockLength(
"Blocklength of DES should be multiplier of 64")
self._key = None
self._blocklength = blocklength
def set_key(self, key):
string_key = bits_to_bytes(key)
self._key = DesKey(string_key)
if not self._key.is_single():
raise WrongConfiguration("3DES has been configured")
def encrypt(self, message):
byte_message = bits_to_bytes(message)
encrypted_bytes = None
for _ in range(round(self._blocklength / 64)):
encrypted_bytes = self._key.encrypt(byte_message)
return bytes_to_bits(encrypted_bytes)
def decrypt(self, message):
byte_message = bits_to_bytes(message)
decrypted_bytes = None
for _ in range(round(self._blocklength / 64)):
decrypted_bytes = self._key.decrypt(byte_message)
return bytes_to_bits(decrypted_bytes)
def encode( Blocks, Keys ): max_len = len( Blocks ) if len( Blocks ) > len( Keys ) else len( Keys ) enc_blocks = [] for i in range( 0, max_len ): key = DesKey( Keys[ i % len( Keys ) ].decode( 'hex' ) ) enc_block = key.encrypt( pad( Blocks[ i % len( Blocks ) ] ) ) if int( SECRET[ i % len( SECRET ) ] ) == 1: enc_block = key.encrypt( enc_block ) enc_blocks.append( enc_block.encode( 'hex' ) ) return enc_blocks
def des_timer(test_vectors):
"""Encrypts (DES) each element of test_vector with a padding (64 bits)
and returns a list of tuples with (encryption time, decryption time)"""
timelist = []
for vector in test_vectors: #test_vector elements are of byte type
#key creation for DES
iv = secrets.token_bytes(8)
des_instance = DesKey(secrets.token_bytes(8))
#print(des_instance.is_single())
#creating padding instance
padder = padding.PKCS7(64).padder()
#encrypting begins (using CBC mode)
start_e = timer()
padded_m = padder.update(vector) + padder.finalize(
) #padding is included in the process as instructed
cyphertext = des_instance.encrypt(padded_m, initial=iv)
end_e = timer()
#encrypting ends, timing this section
#print(str(cyphertext))
#creating unpadding instance
unpadder = padding.PKCS7(64).unpadder()
#decrypting begins
start_d = timer()
plaintext_d = des_instance.decrypt(cyphertext, initial=iv)
plaintext = unpadder.update(plaintext_d) + unpadder.finalize()
end_d = timer()
#decryption ends
#print(plaintext)
timelist.append((end_e - start_e, end_d - start_d))
return timelist
def server_program():
# get the hostname
host = socket.gethostname()
port = 12345
s = socket.socket()
s.bind((host, port))
desFile = open("deskey.txt", "r")
hmacFile = open("hmackey.txt", "r")
desKeystr = desFile.read()
desKey = DesKey(desKeystr.encode('utf-8'))
hmacKey = hmacFile.read()
hmacKeystr = hmacFile.read()
byteHmacKey = bytes(hmacKeystr, encoding='utf8')
digest_maker = hmac.new(byteHmacKey, msg=None, digestmod=hashlib.sha1)
print("Connecting to client...")
# configure how many client the server can listen simultaneously
s.listen(10)
connection, address = s.accept() # accepts the new connection
print("Connection from: " + str(address))
while True:
# receive data stream. it won't accept data packet greater than 1024 bytes
data = connection.recv(1024)
if not data:
break
print("received cipher text: %s" % data.decode('utf-8', 'ignore'))
pt = desKey.decrypt(data, padding=True).decode()
print("received plaintext: %s" % pt)
digest_maker.update(data)
digest = digest_maker.hexdigest()
# rhmacKey = hashlib.sha256(str(data).encode('utf-8'))
print("received HMAC message: " + digest)
print("calculated HMAC: " + digest)
print("HMAC Verified")
print("===========================================================")
data = input(' -> ')
ct = desKey.encrypt(data.encode('utf-8'), padding=True)
digest_maker.update(data.encode())
print("shared DES key: ", desKeystr)
print("shared HMAC key: %s" % hmacKey)
print("sent plaintext: %s" % data)
print("sent HMAC message: " + digest_maker.hexdigest())
print("sent ciphertext: %s" % ct.decode('utf-8', 'ignore'))
print("===========================================================")
connection.send(ct)
connection.close()
desFile.close()
hmacFile.close()
def handle_request(self, request):
key = DesKey(request.key) # Create a DesKey object using the user provided key
if request.encryption_state == CryptoMode.EN:
request.result = key.encrypt(request.data_input, padding=True)
else:
request.result = key.decrypt(request.data_input, padding=True)
self.next_handler.handle_request(request) # pass the control to the next handler
def handle_request(self, request: Request) -> (str, bool):
if not request.data_input and request.input_file:
return self.next_handler.handle_request(request)
key = DesKey(request.key.encode('utf-8'))
request.result = key.encrypt(request.data_input.encode('utf-8'),
padding=True)
if self.next_handler is None:
return "", True
return self.next_handler.handle_request(request)
def encrypt(masterpass, userid, plain):
# masterpass = hashlib.shake_256(masterkey.encode())
userpass = hashlib.shake_256(userid.encode())
masterpass = masterpass.hexdigest(24)
userpass = userpass.hexdigest(24)
masterpass = bytearray.fromhex(masterpass)
userpass = bytearray.fromhex(userpass)
masterpass = DesKey(masterpass)
userpass = DesKey(userpass)
cipher = masterpass.encrypt(bytes(plain, 'utf-8'), padding=True)
cipher = userpass.encrypt(cipher, padding=True)
cipher = masterpass.encrypt(cipher, padding=True)
cipher1 = ''
for i in cipher:
cipher1 = cipher1 + format(i, '02x')
return cipher1
def handle_request(self, request) -> None:
print("Encryption handler running")
# Set up encryption key
bytes_key = request.key.encode()
key0 = DesKey(bytes_key)
# Encrypting from direct string
if request.data_input:
print("Encrypting request from direct string... ...")
bytes_str = request.data_input.encode()
request.result = key0.encrypt(bytes_str, padding=True)
else:
print("Encrypting from input file... ...")
with open(request.input_file) as file:
# bytes_str = request.input_file.encode()
bytes_str = file.read().encode()
request.result = key0.encrypt(bytes_str, padding=True)
if self.next_handler:
self.next_handler.handle_request(request)
else:
return
def genAndSendCipherText():
# open read, and encode key, set to key0
f = open("DESkey.txt", "r")
key_from_file = str.encode(f.read())
key0 = DesKey(key_from_file)
# encrypt plaintext and send to server
encrypted_message = key0.encrypt(combo_message, padding=True)
s.send(encrypted_message)
# print ciphertext to console
print("sent ciphertext:", end=' ')
print(encrypted_message)
print("************************************************")
def encrypt_file(self,
in_filename,
out_filename=None,
chunksize=64 * 1024):
if not out_filename:
out_filename = in_filename + '.des'
iv = Generate.generateByteString(self.block_size)
userkey, index = self.userKey.getEncryptionKey()
encryptionKey = XORKey(self.key, userkey)
cipher = DesKey(encryptionKey)
cipherFunc = lambda x: cipher.encrypt(x, initial=iv)
UIFunctions.log("DES Encryption Started")
FileCrypto.encrypt_CBC(index, cipherFunc, iv, self.block_size,
in_filename, out_filename, chunksize)
def handle_request(self, request: Request) -> (str, bool):
if request.data_input and not request.input_file:
return self.next_handler.handle_request(request)
key = DesKey(request.key.encode('utf-8'))
try:
with open(request.input_file, 'rb') as file_object:
request.result = key.encrypt(file_object.read(), padding=True)
if self.next_handler is None:
return "", True
return self.next_handler.handle_request(request)
except FileNotFoundError:
return f"{request.input_file} not exist!", False
def handle_request(self, command: Request) -> (bool, str):
"""
It converts the Key into DesKey and encrypt the data,
assigns it to a result attribute of the request.
:param command: a Request
:return: a tuple where the first element is a string stating the
outcome and the reason, and the second a bool indicating
successful handling of the form or not.
"""
print("Encrypting...")
key = DesKey(command.key.encode("utf-8"))
command.result = key.encrypt(command.data.encode("utf-8"),
padding=True)
return self.pass_handler(command)
def handle_request(self, request: Request) -> (str, bool):
"""
Encrypts the data with the key
:param request: Request from cmd line args
:return: (str, bool) str: a message, bool True if validation is passed
"""
data = request.data_input
if not data:
return "There is no data to be encrypted.", False
key = DesKey(request.key.encode('utf-8'))
request.result = key.encrypt(data, padding=True)
if self.next_handler:
return self.next_handler.handle_request(request)
else:
return "", True
def main():
DESBlackbox() #generate plaintext ciphertext pairs for some keys
knownk1 = "aaaaaaaa" #known 32 bits of keys
knownkBits = BitArray(hex=knownk1)
print(knownkBits)
p, c = plaincipher[0]
print("Plaintext 1 = " + p)
print("Ciphertext 1 =" + c)
for k in generateKeys(knownkBits):
k1 = formatKey(k.bin)
key = DesKey(BitArray(k1).tobytes())
firstDict[key.encrypt(p)] = k
secondDict[key.decrypt(c)] = k
mitm()
mitm()
def resetkey(self):
if self.confirmkey():
with open("keyenter.bytes", "wb") as fp:
new_pin = self.textEdit_2.toPlainText()
pad_text = pad(new_pin)
b = bytes(pad_text, 'utf-8')
key0 = DesKey(b)
enteredkey = key0.encrypt(b"teamhellowworld", padding=True)
print("new pin is:" + new_pin)
fp.write(enteredkey)
self.info.append("Reset pin success!")
else:
self.info.append("Reset pin fail!")
return
def client_program():
host = socket.gethostname()
port = 12345 # socket server port number
# create the socket in the client side
s = socket.socket()
s.connect((host, port)) # connect to the server
desFile = open("deskey.txt", "r")
hmacFile = open("hmackey.txt", "r")
desKeystr = desFile.read()
key = DesKey(desKeystr.encode('utf-8')) # create a key
hmacKey = hmacFile.read()
hmacKeystr = hmacFile.read()
byteHmacKey = bytes(hmacKeystr, encoding='utf8')
digest_maker = hmac.new(byteHmacKey, msg=None, digestmod=hashlib.sha1)
message = input(" -> ")
while message.lower().strip() != 'bye':
con = key.encrypt(message.encode('utf-8'), padding=True)
digest_maker.update(message.encode())
digest = digest_maker.hexdigest()
print("shared DES key: %s" % desKeystr)
print("shared HMAC key: %s" % hmacKey)
print("sent plaintext: %s" % message)
print("sent HMAC message: " + digest)
print("sent ciphertext: %s" % con.decode('utf-8', 'ignore'))
print("===========================================================")
s.send(con)
data = s.recv(1024) # receive response
print("received ciphertext: %s" % data.decode('utf-8', 'ignore'))
pt = key.decrypt(data, padding=True).decode()
print("received plaintext: %s" % pt)
digest_maker.update(data)
digest = digest_maker.hexdigest()
print("received HMAC message: " + digest)
print("calculated HMAC: " + digest)
print("HMAC Verified")
print("===========================================================")
message = input(" -> ") # again take input
s.close() # close the connection
desFile.close()
hmacFile.close()
def worker_func(i):
# Simply computes the sum of the i-th row of the input matrix X
# X_np = np.frombuffer(var_dict['X'], dtype=np.uint8).reshape(
# var_dict['X_shape'])
# time.sleep(1) # Some heavy computations
# return np.asscalar(np.sum(X_np[i, :]))
des = DesKey(bytes(var_dict['key'], encoding="utf-8"))
img_array = np.frombuffer(var_dict['X'],
dtype=np.uint8).reshape(var_dict['X_shape'])
if var_dict['mode'] == 'e':
enc_x = des.encrypt(img_array[i].tobytes(), padding=False)
else:
enc_x = des.decrypt(img_array[i].tobytes(), padding=False)
enc_x = np.frombuffer(enc_x, dtype=np.uint8).reshape(
(var_dict['X_shape'][1], var_dict['X_shape'][2]))
return enc_x
class MyUDPHandler(socketserver.BaseRequestHandler):
def handle(self):
data = self.request[0].strip()
socket = self.request[1]
print(f"{self.client_address[0]} wrote:\n{data}")
if data == b'AS_REQ':
user_login = socket.recv(1024).decode('utf-8')
t1 = socket.recv(1024)
print(user_login, t1)
if user_login not in USER_DB:
socket.sendto(b'Error: You are not in DB', self.client_address)
return
password = USER_DB[user_login].encode('utf-8')
m = hashlib.sha256()
m.update(password)
# create key
self.key_c = DesKey(m.digest()[:8])
t1_kc = self.key_c.decrypt(t1)
delta = dt.datetime.utcnow() - dt.datetime.fromtimestamp(
int.from_bytes(t1_kc, 'big'))
if delta.total_seconds() / 60 > 5:
socket.sendto(
b'Error: Timezones must be identical or check your password',
self.client_address)
return
# AS_REP
# key generation:
# https://stackoverflow.com/questions/2257441/random-string-generation-with-upper-case-letters-and-digits/23728630#23728630
key_c_tgs = ''.join(
secrets.choice(string.ascii_letters + string.digits)
for _ in range(8))
p1 = 8 # hours
t_kdc = int(dt.datetime.utcnow().timestamp())
data_kc = json.dumps([key_c_tgs, TGS_ADDRESS, p1]).encode('utf-8')
data_kc = self.key_c.encrypt(data_kc)
socket.sendto(data_kc, self.client_address)
tgt = json.dumps([user_login, key_c_tgs, p1,
t_kdc]).encode('utf-8')
tgt = K_TGS.encrypt(tgt)
socket.sendto(tgt, self.client_address)
