def loop(self):
while True:
try:
choice = get_choice(hint='1. encrypt\n2. decrypt\nchoice: ',
options=['1', '2'])
if choice == '1':
plaintext = input('plaintext: ')
encrypted_text = self.encrypt(plaintext.encode('utf8'))
msg = binascii.hexlify(encrypted_text).decode('utf8')
print('encrypted:{}'.format(msg))
continue
if choice == '2':
ciphertext = input('ciphertext: ')
if ciphertext.startswith('encrypted:') and is_hex_str(
ciphertext[10:]):
try:
plaintext = self.decrypt(
bytes.fromhex(ciphertext[10:]))
print('decrypted:{}'.format(
plaintext.decode('utf8')))
except Exception as e:
print('[!] decrypt failed: {}'.format(e.message))
else:
print('[!] unrecognized ciphertext format')
continue
except (KeyboardInterrupt, EOFError):
print('loop exit')
break
def loop(self):
while True:
try:
choice = get_choice(hint='1. encrypt\n2. decrypt\nchoice: ',
options=['1', '2'])
if choice == '1':
secret_key = os.urandom(32)
self.fernet = Fernet(base64.urlsafe_b64encode(secret_key))
encrypted_secret_key = self.my_friend_public_key.encrypt(
secret_key,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
encrypted_secret_key_msg = binascii.hexlify(
encrypted_secret_key).decode('utf8')
plaintext = input('plaintext: ')
encrypted_text = self.encrypt(plaintext.encode('utf8'))
msg = binascii.hexlify(encrypted_text).decode('utf8')
print('offline_encrypted:{}:{}'.format(
encrypted_secret_key_msg, msg))
continue
if choice == '2':
ciphertext = input('ciphertext: ')
if ciphertext.startswith('offline_encrypted:'):
encrypted_secret_key_msg, msg = ciphertext[18:].split(
':')
if is_hex_str(encrypted_secret_key_msg) and is_hex_str(
msg):
encrypted_secret_key = bytes.fromhex(
encrypted_secret_key_msg)
secret_key = self.my_private_key.decrypt(
encrypted_secret_key,
padding.OAEP(mgf=padding.MGF1(
algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
self.fernet = Fernet(
base64.urlsafe_b64encode(secret_key))
try:
plaintext = self.decrypt(bytes.fromhex(msg))
print('decrypted:{}'.format(
plaintext.decode('utf8')))
except Exception as e:
print('[!] decrypt failed: {}'.format(
e.message))
else:
print('[!] incorrect hex_str')
else:
print('[!] unrecognized ciphertext format')
except (KeyboardInterrupt, EOFError):
print('loop exit')
break
def main():
choice = get_choice(hint='1. online\n2. offline\nchoice: ',
options=['1', '2'])
if choice == '1':
choice = get_choice(
hint=
'1. blink_qq\n2. pure_talk_ec_share_key\n3. pure_talk_rsa_share_key\nchoice: ',
options=['1', '2', '3'])
if choice == '1':
blink_qq.main()
if choice == '2':
pure_talk_ec_share_key.main()
if choice == '3':
pure_talk_rsa_share_key.main()
if choice == '2':
choice = get_choice(hint='1. pure_talk\n2. pure_file\nchoice: ',
options=['1', '2'])
if choice == '1':
pure_talk.main()
if choice == '2':
pure_file.main()
pass
def prepare(self):
my_key_dir = os.path.join(base_dir, 'private')
my_private_key_file_path = os.path.join(my_key_dir, 'my_pri_key')
my_public_key_file_path = os.path.join(my_key_dir, 'my_pub_key')
friend_keys_dir_path = os.path.join(base_dir, 'friends')
if not os.path.exists(my_key_dir):
os.makedirs(my_key_dir)
if not os.path.exists(friend_keys_dir_path):
os.makedirs(friend_keys_dir_path)
if not os.path.exists(my_private_key_file_path) or not os.path.exists(
my_public_key_file_path):
print('private or public key does not exist!')
choice = get_choice(hint='1. generate key pair\n2. exit\nchoice: ',
options=['1', '2'])
if choice == '1':
my_private_key = rsa.generate_private_key(
public_exponent=65537, key_size=2048, backend=self.backend)
private_key_password = getpass.getpass(
'input a password for private_key, default is empty: ')
if private_key_password:
my_private_key_bytes = my_private_key.private_bytes(
serialization.Encoding.DER,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.
BestAvailableEncryption(
private_key_password.encode('utf8')))
else:
my_private_key_bytes = my_private_key.private_bytes(
serialization.Encoding.DER,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption())
open(my_private_key_file_path,
'wb').write(my_private_key_bytes)
my_public_key = my_private_key.public_key()
my_public_key_bytes = my_public_key.public_bytes(
serialization.Encoding.DER,
serialization.PublicFormat.SubjectPublicKeyInfo)
open(my_public_key_file_path, 'wb').write(my_public_key_bytes)
if choice == '2':
exit(0)
friend_key_names = os.listdir(friend_keys_dir_path)
if not friend_key_names:
print('there is no one friend\'s public key, exit')
exit(0)
hint = 'friend_key_names:\n {}\ninput a key name you want: '.format(
' \n'.join(friend_key_names))
selected_friend_key_name = get_choice(hint=hint,
options=friend_key_names)
my_friend_public_key_file_path = os.path.join(
friend_keys_dir_path, selected_friend_key_name)
my_friend_public_key_content = open(my_friend_public_key_file_path,
'rb').read()
self.my_friend_public_key = serialization.load_der_public_key(
my_friend_public_key_content, self.backend)
my_private_key_content = open(my_private_key_file_path, 'rb').read()
private_key_password = getpass.getpass(
'input the password of private_key, default is empty: ')
if private_key_password:
self.my_private_key = serialization.load_der_private_key(
my_private_key_content, private_key_password.encode('utf8'),
self.backend)
else:
self.my_private_key = serialization.load_der_private_key(
my_private_key_content, None, self.backend)
def loop(self):
while True:
try:
choice = get_choice(hint='1. encrypt\n2. decrypt\nchoice: ',
options=['1', '2'])
if choice == '1':
secret_key = os.urandom(32)
self.fernet = Fernet(base64.urlsafe_b64encode(secret_key))
encrypted_secret_key = self.my_friend_public_key.encrypt(
secret_key,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
encrypted_secret_key_hex = binascii.hexlify(
encrypted_secret_key)
raw_file_path = input('raw_file_path: ')
raw_file = open(raw_file_path, 'rb')
raw_content = raw_file.read()
raw_file.close()
encrypted_content = self.encrypt(raw_content)
encrypted_file_path = raw_file_path + '.encrypted'
encrypted_file = open(encrypted_file_path, 'wb')
encrypted_file.write(encrypted_secret_key_hex)
encrypted_file.write(b':')
encrypted_file.write(encrypted_content)
encrypted_file.close()
print('encrypted_file_path:{}'.format(encrypted_file_path))
continue
if choice == '2':
encrypted_file_path = input('encrypted_file_path: ')
if encrypted_file_path.endswith('.encrypted'):
encrypted_file = open(encrypted_file_path, 'rb')
encrypted_secret_key_hex, encrypted_content = encrypted_file.read(
).split(b':', maxsplit=1)
encrypted_file.close()
encrypted_secret_key = binascii.unhexlify(
encrypted_secret_key_hex)
secret_key = self.my_private_key.decrypt(
encrypted_secret_key,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
self.fernet = Fernet(
base64.urlsafe_b64encode(secret_key))
raw_content = self.decrypt(encrypted_content)
decrypted_file_path = encrypted_file_path[:-10]
decrypted_file = open(decrypted_file_path, 'wb')
decrypted_file.write(raw_content)
decrypted_file.close()
print('decrypted_file_path:{}'.format(
decrypted_file_path))
else:
print(
'[!] unrecognized encrypted_file_path format. It need to be endswith ".encrypted"'
)
continue
except (KeyboardInterrupt, EOFError):
print('loop exit')
break
def prepare(self):
my_key_dir = os.path.join(base_dir, 'private')
my_private_key_file_path = os.path.join(my_key_dir, 'my_pri_key')
my_public_key_file_path = os.path.join(my_key_dir, 'my_pub_key')
friend_keys_dir_path = os.path.join(base_dir, 'friends')
if not os.path.exists(my_key_dir):
os.makedirs(my_key_dir)
if not os.path.exists(friend_keys_dir_path):
os.makedirs(friend_keys_dir_path)
if not os.path.exists(my_private_key_file_path) or not os.path.exists(
my_public_key_file_path):
print('private or public key does not exist!')
choice = get_choice(hint='1. generate key pair\n2. exit\nchoice: ',
options=['1', '2'])
if choice == '1':
my_private_key = rsa.generate_private_key(
public_exponent=65537, key_size=2048, backend=self.backend)
private_key_password = getpass.getpass(
'input a password for private_key, default is empty: ')
if private_key_password:
my_private_key_bytes = my_private_key.private_bytes(
serialization.Encoding.DER,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.
BestAvailableEncryption(
private_key_password.encode('utf8')))
else:
my_private_key_bytes = my_private_key.private_bytes(
serialization.Encoding.DER,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption())
open(my_private_key_file_path,
'wb').write(my_private_key_bytes)
my_public_key = my_private_key.public_key()
my_public_key_bytes = my_public_key.public_bytes(
serialization.Encoding.DER,
serialization.PublicFormat.SubjectPublicKeyInfo)
open(my_public_key_file_path, 'wb').write(my_public_key_bytes)
if choice == '2':
exit(0)
choice = get_choice(
hint=
'1. generate secret_key for talk\n2. decrypt encrypted secret_key from your friend\nchoice: ',
options=['1', '2'])
if choice == '1':
secret_key = os.urandom(32)
friend_key_names = os.listdir(friend_keys_dir_path)
if not friend_key_names:
print('there is no one friend\'s public key, exit')
exit(0)
hint = 'friend_key_names:\n {}\ninput a key name you want: '.format(
' \n'.join(friend_key_names))
selected_friend_key_name = get_choice(hint=hint,
options=friend_key_names)
my_friend_public_key_file_path = os.path.join(
friend_keys_dir_path, selected_friend_key_name)
my_friend_public_key_content = open(my_friend_public_key_file_path,
'rb').read()
my_friend_public_key = serialization.load_der_public_key(
my_friend_public_key_content, self.backend)
encrypted_secret_key = my_friend_public_key.encrypt(
secret_key,
padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
msg = 'encrypted_secret_key:{}'.format(
binascii.hexlify(encrypted_secret_key).decode('utf8'))
print(
'Please send the following encrypted_secret_key msg to your friend'
)
print(msg)
if choice == '2':
my_private_key_content = open(my_private_key_file_path,
'rb').read()
private_key_password = getpass.getpass(
'input the password of private_key, default is empty: ')
if private_key_password:
my_private_key = serialization.load_der_private_key(
my_private_key_content,
private_key_password.encode('utf8'), self.backend)
else:
my_private_key = serialization.load_der_private_key(
my_private_key_content, None, self.backend)
while True:
encrypted_secret_key_msg = input(
'Please input encrypted_secret_key msg from your friend: '
).strip()
if encrypted_secret_key_msg.startswith(
'encrypted_secret_key:') and is_hex_str(
encrypted_secret_key_msg[21:]):
break
else:
print(
'[!] encrypted_secret_key msg must start with "encrypted_secret_key:" and have correct hex_str'
)
continue
encrypted_secret_key_bytes = bytes.fromhex(
encrypted_secret_key_msg[21:])
secret_key = my_private_key.decrypt(
encrypted_secret_key_bytes,
padding.OAEP(mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=None))
self.fernet = Fernet(base64.urlsafe_b64encode(secret_key))