def generate_probable_safe_prime(**kwargs):
"""Generate a random, probable safe prime.
Note this operation is much slower than generating a simple prime.
:Keywords:
exact_bits : integer
The desired size in bits of the probable safe prime.
randfunc : callable
An RNG function where candidate primes are taken from.
:Return:
A probable safe prime in the range
2^exact_bits > p > 2^(exact_bits-1).
"""
exact_bits = kwargs.pop("exact_bits", None)
randfunc = kwargs.pop("randfunc", None)
if kwargs:
raise ValueError("Unknown parameters: " + kwargs.keys())
if randfunc is None:
randfunc = Random.new().read
result = COMPOSITE
while result == COMPOSITE:
q = generate_probable_prime(exact_bits=exact_bits - 1,
randfunc=randfunc)
candidate = q * 2 + 1
if candidate.size_in_bits() != exact_bits:
continue
result = test_probable_prime(candidate, randfunc=randfunc)
return candidate
def __init__(self):
self.socket = socket.socket()
self.key = Random.new().read(int(16))
self.crypto = Crypto()
self.Aesob = AESC(self.key)
self.systemc = System.system()
self.monitorc = Monitor.monitor()
def _test_random_key(self, bits):
elgObj = ElGamal.generate(bits, Random.new().read)
self._check_private_key(elgObj)
self._exercise_primitive(elgObj)
pub = elgObj.publickey()
self._check_public_key(pub)
self._exercise_public_primitive(elgObj)
def getrandbits(self, k):
"""Return an integer with k random bits."""
if self._randfunc is None:
self._randfunc = Random.new().read
mask = (1 << k) - 1
return mask & bytes_to_long(self._randfunc(ceil_div(k, 8)))
def test_generate_3args(self):
rsaObj = self.rsa.generate(1024, Random.new().read,e=65537)
self._check_private_key(rsaObj)
self._exercise_primitive(rsaObj)
pub = rsaObj.publickey()
self._check_public_key(pub)
self._exercise_public_primitive(rsaObj)
self.assertEqual(65537,rsaObj.e)
def test_generate_2arg(self):
"""RSA (default implementation) generated key (2 arguments)"""
rsaObj = self.rsa.generate(1024, Random.new().read)
self._check_private_key(rsaObj)
self._exercise_primitive(rsaObj)
pub = rsaObj.publickey()
self._check_public_key(pub)
self._exercise_public_primitive(rsaObj)
def generate_probable_prime(**kwargs):
"""Generate a random probable prime.
The prime will not have any specific properties
(e.g. it will not be a *strong* prime).
Random numbers are evaluated for primality until one
passes all tests, consisting of a certain number of
Miller-Rabin tests with random bases followed by
a single Lucas test.
The number of Miller-Rabin iterations is chosen such that
the probability that the output number is a non-prime is
less than 1E-30 (roughly 2^{-100}).
This approach is compliant to `FIPS PUB 186-4`__.
:Keywords:
exact_bits : integer
The desired size in bits of the probable prime.
It must be at least 160.
randfunc : callable
An RNG function where candidate primes are taken from.
prime_filter : callable
A function that takes an Integer as parameter and returns
True if the number can be passed to further primality tests,
False if it should be immediately discarded.
:Return:
A probable prime in the range 2^exact_bits > p > 2^(exact_bits-1).
.. __: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf
"""
exact_bits = kwargs.pop("exact_bits", None)
randfunc = kwargs.pop("randfunc", None)
prime_filter = kwargs.pop("prime_filter", lambda x: True)
if kwargs:
raise ValueError("Unknown parameters: " + kwargs.keys())
if exact_bits is None:
raise ValueError("Missing exact_bits parameter")
if exact_bits < 160:
raise ValueError("Prime number is not big enough.")
if randfunc is None:
randfunc = Random.new().read
result = COMPOSITE
while result == COMPOSITE:
candidate = Integer.random(exact_bits=exact_bits,
randfunc=randfunc) | 1
if not prime_filter(candidate):
continue
result = test_probable_prime(candidate, randfunc)
return candidate
def test_probable_prime(candidate, randfunc=None):
"""Test if a number is prime.
A number is qualified as prime if it passes a certain
number of Miller-Rabin tests (dependent on the size
of the number, but such that probability of a false
positive is less than 10^-30) and a single Lucas test.
For instance, a 1024-bit candidate will need to pass
4 Miller-Rabin tests.
:Parameters:
candidate : integer
The number to test for primality.
randfunc : callable
The routine to draw random bytes from to select Miller-Rabin bases.
:Returns:
``PROBABLE_PRIME`` if the number if prime with very high probability.
``COMPOSITE`` if the number is a composite.
For efficiency reasons, ``COMPOSITE`` is also returned for small primes.
"""
if randfunc is None:
randfunc = Random.new().read
if not isinstance(candidate, Integer):
candidate = Integer(candidate)
# First, check trial division by the smallest primes
if int(candidate) in _sieve_base:
return PROBABLY_PRIME
try:
map(candidate.fail_if_divisible_by, _sieve_base)
except ValueError:
return COMPOSITE
# These are the number of Miller-Rabin iterations s.t. p(k, t) < 1E-30,
# with p(k, t) being the probability that a randomly chosen k-bit number
# is composite but still survives t MR iterations.
mr_ranges = ((220, 30), (280, 20), (390, 15), (512, 10), (620, 7),
(740, 6), (890, 5), (1200, 4), (1700, 3), (3700, 2))
bit_size = candidate.size_in_bits()
try:
mr_iterations = list(filter(lambda x: bit_size < x[0],
mr_ranges))[0][1]
except IndexError:
mr_iterations = 1
if miller_rabin_test(candidate, mr_iterations,
randfunc=randfunc) == COMPOSITE:
return COMPOSITE
if lucas_test(candidate) == COMPOSITE:
return COMPOSITE
return PROBABLY_PRIME
def encrypt(plaintext):
iv = Random.new().read(AES.block_size)
#add padding
if (len(plaintext) % 16 != 0):
plaintext += b'_' * (16 - len(plaintext) % 16)
cipher = AES.new(shared_key, AES.MODE_CBC, iv)
ciphertext = cipher.encrypt(plaintext)
return hexlify(iv) + b"," + hexlify(ciphertext) + b"\n"
def setup_crypto(self, sn):
"""
Performs decryption of packets received. Stores decrypted packets in a Queue for use.
"""
if is_old_model(sn):
self.old_model = True
# print self.old_model
k = ['\0'] * 16
k[0] = sn[-1]
k[1] = '\0'
k[2] = sn[-2]
if self.is_research:
k[3] = 'H'
k[4] = sn[-1]
k[5] = '\0'
k[6] = sn[-2]
k[7] = 'T'
k[8] = sn[-3]
k[9] = '\x10'
k[10] = sn[-4]
k[11] = 'B'
else:
k[3] = 'T'
k[4] = sn[-3]
k[5] = '\x10'
k[6] = sn[-4]
k[7] = 'B'
k[8] = sn[-1]
k[9] = '\0'
k[10] = sn[-2]
k[11] = 'H'
k[12] = sn[-3]
k[13] = '\0'
k[14] = sn[-4]
k[15] = 'P'
key = ''.join(k)
iv = Random.new().read(AES.block_size)
cipher = AES.new(key, AES.MODE_ECB, iv)
# for i in k:
# print "0x%.02x " % (ord(i))
while self.running:
while not tasks.empty():
task = tasks.get()
try:
data = cipher.decrypt(task[:16]) + cipher.decrypt(task[16:])
self.packets.put_nowait(EmotivPacket(data, self.sensors, self.old_model))
self.packets_processed += 1
except:
pass
gevent.sleep(0)
gevent.sleep(0)
def __init__(self):
self.block_size = None
self.block_fill = None
self.current_len = None
self.original_len = None
self.startyet = False
self.current_block = None
self.current_byte = None
self.data = None
self.is_success = False
self.rstr = Random.new().read(random.choice(range(5,20)))
print(getbytestr("Original String is - ")+self.rstr)
#self.rstr = getbytestr("a")
self.plaintext = ""
def random(cls, **kwargs):
"""Generate a random natural integer of a certain size.
:Keywords:
exact_bits : positive integer
The length in bits of the resulting random Integer number.
The number is guaranteed to fulfil the relation:
2^bits > result >= 2^(bits - 1)
max_bits : positive integer
The maximum length in bits of the resulting random Integer number.
The number is guaranteed to fulfil the relation:
2^bits > result >=0
randfunc : callable
A function that returns a random byte string. The length of the
byte string is passed as parameter. Optional.
If not provided (or ``None``), randomness is read from the system RNG.
:Return: a Integer object
"""
exact_bits = kwargs.pop("exact_bits", None)
max_bits = kwargs.pop("max_bits", None)
randfunc = kwargs.pop("randfunc", None)
if randfunc is None:
randfunc = Random.new().read
if exact_bits is None and max_bits is None:
raise ValueError(
"Either 'exact_bits' or 'max_bits' must be specified")
if exact_bits is not None and max_bits is not None:
raise ValueError(
"'exact_bits' and 'max_bits' are mutually exclusive")
bits = exact_bits or max_bits
bytes_needed = ((bits - 1) // 8) + 1
significant_bits_msb = 8 - (bytes_needed * 8 - bits)
msb = bord(randfunc(1)[0])
if exact_bits is not None:
msb |= 1 << (significant_bits_msb - 1)
msb &= (1 << significant_bits_msb) - 1
return cls.from_bytes(bchr(msb) + randfunc(bytes_needed - 1))
def random_range(cls, **kwargs):
"""Generate a random integer within a given internal.
:Keywords:
min_inclusive : integer
The lower end of the interval (inclusive).
max_inclusive : integer
The higher end of the interval (inclusive).
max_exclusive : integer
The higher end of the interval (exclusive).
randfunc : callable
A function that returns a random byte string. The length of the
byte string is passed as parameter. Optional.
If not provided (or ``None``), randomness is read from the system RNG.
:Returns:
An Integer randomly taken in the given interval.
"""
min_inclusive = kwargs.pop("min_inclusive", None)
max_inclusive = kwargs.pop("max_inclusive", None)
max_exclusive = kwargs.pop("max_exclusive", None)
randfunc = kwargs.pop("randfunc", None)
if kwargs:
raise ValueError("Unknown keywords: " + str(kwargs.keys))
if None not in (max_inclusive, max_exclusive):
raise ValueError("max_inclusive and max_exclusive cannot be both"
" specified")
if max_exclusive is not None:
max_inclusive = max_exclusive - 1
if None in (min_inclusive, max_inclusive):
raise ValueError("Missing keyword to identify the interval")
if randfunc is None:
randfunc = Random.new().read
norm_maximum = max_inclusive - min_inclusive
bits_needed = cls(norm_maximum).size_in_bits()
norm_candidate = -1
while not 0 <= norm_candidate <= norm_maximum:
norm_candidate = cls.random(max_bits=bits_needed,
randfunc=randfunc)
return norm_candidate + min_inclusive
def test_generate_2arg(self):
"""DSA (default implementation) generated key (2 arguments)"""
dsaObj = self.dsa.generate(1024, Random.new().read)
self._check_private_key(dsaObj)
pub = dsaObj.publickey()
self._check_public_key(pub)
def runTest(self):
"""Crypto.Random.new()"""
# Import the Random module and try to use it
from crypto import Random
randobj = Random.new()
x = randobj.read(16)
y = randobj.read(16)
self.assertNotEqual(x, y)
z = Random.get_random_bytes(16)
self.assertNotEqual(x, z)
self.assertNotEqual(y, z)
# Test the Random.random module, which
# implements a subset of Python's random API
# Not implemented:
# seed(), getstate(), setstate(), jumpahead()
# random(), uniform(), triangular(), betavariate()
# expovariate(), gammavariate(), gauss(),
# longnormvariate(), normalvariate(),
# vonmisesvariate(), paretovariate()
# weibullvariate()
# WichmannHill(), whseed(), SystemRandom()
from crypto.Random import random
x = random.getrandbits(16*8)
y = random.getrandbits(16*8)
self.assertNotEqual(x, y)
# Test randrange
if x>y:
start = y
stop = x
else:
start = x
stop = y
for step in range(1,10):
x = random.randrange(start,stop,step)
y = random.randrange(start,stop,step)
self.assertNotEqual(x, y)
self.assertEqual(start <= x < stop, True)
self.assertEqual(start <= y < stop, True)
self.assertEqual((x - start) % step, 0)
self.assertEqual((y - start) % step, 0)
for i in range(10):
self.assertEqual(random.randrange(1,2), 1)
self.assertRaises(ValueError, random.randrange, start, start)
self.assertRaises(ValueError, random.randrange, stop, start, step)
self.assertRaises(TypeError, random.randrange, start, stop, step, step)
self.assertRaises(TypeError, random.randrange, start, stop, "1")
self.assertRaises(TypeError, random.randrange, "1", stop, step)
self.assertRaises(TypeError, random.randrange, 1, "2", step)
self.assertRaises(ValueError, random.randrange, start, stop, 0)
# Test randint
x = random.randint(start,stop)
y = random.randint(start,stop)
self.assertNotEqual(x, y)
self.assertEqual(start <= x <= stop, True)
self.assertEqual(start <= y <= stop, True)
for i in range(10):
self.assertEqual(random.randint(1,1), 1)
self.assertRaises(ValueError, random.randint, stop, start)
self.assertRaises(TypeError, random.randint, start, stop, step)
self.assertRaises(TypeError, random.randint, "1", stop)
self.assertRaises(TypeError, random.randint, 1, "2")
# Test choice
seq = list(range(10000))
x = random.choice(seq)
y = random.choice(seq)
self.assertNotEqual(x, y)
self.assertEqual(x in seq, True)
self.assertEqual(y in seq, True)
for i in range(10):
self.assertEqual(random.choice((1,2,3)) in (1,2,3), True)
self.assertEqual(random.choice([1,2,3]) in [1,2,3], True)
if sys.version_info[0] is 3:
self.assertEqual(random.choice(bytearray(b('123'))) in bytearray(b('123')), True)
self.assertEqual(1, random.choice([1]))
self.assertRaises(IndexError, random.choice, [])
self.assertRaises(TypeError, random.choice, 1)
# Test shuffle. Lacks random parameter to specify function.
# Make copies of seq
seq = list(range(500))
x = list(seq)
y = list(seq)
random.shuffle(x)
random.shuffle(y)
self.assertNotEqual(x, y)
self.assertEqual(len(seq), len(x))
self.assertEqual(len(seq), len(y))
for i in range(len(seq)):
self.assertEqual(x[i] in seq, True)
self.assertEqual(y[i] in seq, True)
self.assertEqual(seq[i] in x, True)
self.assertEqual(seq[i] in y, True)
z = [1]
random.shuffle(z)
self.assertEqual(z, [1])
if sys.version_info[0] == 3:
z = bytearray(b('12'))
random.shuffle(z)
self.assertEqual(b('1') in z, True)
self.assertRaises(TypeError, random.shuffle, b('12'))
self.assertRaises(TypeError, random.shuffle, 1)
self.assertRaises(TypeError, random.shuffle, "11")
self.assertRaises(TypeError, random.shuffle, (1,2))
# 2to3 wraps a list() around it, alas - but I want to shoot
# myself in the foot here! :D
# if sys.version_info[0] == 3:
# self.assertRaises(TypeError, random.shuffle, range(3))
# Test sample
x = random.sample(seq, 20)
y = random.sample(seq, 20)
self.assertNotEqual(x, y)
for i in range(20):
self.assertEqual(x[i] in seq, True)
self.assertEqual(y[i] in seq, True)
z = random.sample([1], 1)
self.assertEqual(z, [1])
z = random.sample((1,2,3), 1)
self.assertEqual(z[0] in (1,2,3), True)
z = random.sample("123", 1)
self.assertEqual(z[0] in "123", True)
z = random.sample(list(range(3)), 1)
self.assertEqual(z[0] in range(3), True)
if sys.version_info[0] == 3:
z = random.sample(b("123"), 1)
self.assertEqual(z[0] in b("123"), True)
z = random.sample(bytearray(b("123")), 1)
self.assertEqual(z[0] in bytearray(b("123")), True)
self.assertRaises(TypeError, random.sample, 1)
def encrypt(data, passphrase, protection, prot_params=None, randfunc=None):
"""Encrypt a piece of data using a passphrase and *PBES2*.
:Parameters:
data : byte string
The piece of data to encrypt.
passphrase : byte string
The passphrase to use for encrypting the data.
protection : string
The identifier of the encryption algorithm to use.
The default value is '``PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC``'.
prot_params : dictionary
Parameters of the protection algorithm.
+------------------+-----------------------------------------------+
| Key | Description |
+==================+===============================================+
| iteration_count | The KDF algorithm is repeated several times to|
| | slow down brute force attacks on passwords |
| | (called *N* or CPU/memory cost in scrypt). |
| | |
| | The default value for PBKDF2 is 1 000. |
| | The default value for scrypt is 16 384. |
+------------------+-----------------------------------------------+
| salt_size | Salt is used to thwart dictionary and rainbow |
| | attacks on passwords. The default value is 8 |
| | bytes. |
+------------------+-----------------------------------------------+
| block_size | *(scrypt only)* Memory-cost (r). The default |
| | value is 8. |
+------------------+-----------------------------------------------+
| parallelization | *(scrypt only)* CPU-cost (p). The default |
| | value is 1. |
+------------------+-----------------------------------------------+
randfunc : callable
Random number generation function; it should accept
a single integer N and return a string of random data,
N bytes long. If not specified, a new RNG will be
instantiated from ``Crypto.Random``.
:Returns:
The encrypted data, as a binary string.
"""
if prot_params is None:
prot_params = {}
if randfunc is None:
randfunc = Random.new().read
if protection == 'PBKDF2WithHMAC-SHA1AndDES-EDE3-CBC':
key_size = 24
module = DES3
cipher_mode = DES3.MODE_CBC
enc_oid = "1.2.840.113549.3.7"
elif protection in ('PBKDF2WithHMAC-SHA1AndAES128-CBC',
'scryptAndAES128-CBC'):
key_size = 16
module = AES
cipher_mode = AES.MODE_CBC
enc_oid = "2.16.840.1.101.3.4.1.2"
elif protection in ('PBKDF2WithHMAC-SHA1AndAES192-CBC',
'scryptAndAES192-CBC'):
key_size = 24
module = AES
cipher_mode = AES.MODE_CBC
enc_oid = "2.16.840.1.101.3.4.1.22"
elif protection in ('PBKDF2WithHMAC-SHA1AndAES256-CBC',
'scryptAndAES256-CBC'):
key_size = 32
module = AES
cipher_mode = AES.MODE_CBC
enc_oid = "2.16.840.1.101.3.4.1.42"
else:
raise ValueError("Unknown PBES2 mode")
# Get random data
iv = randfunc(module.block_size)
salt = randfunc(prot_params.get("salt_size", 8))
# Derive key from password
if protection.startswith('PBKDF2'):
count = prot_params.get("iteration_count", 1000)
key = PBKDF2(passphrase, salt, key_size, count)
kdf_info = DerSequence([
DerObjectId("1.2.840.113549.1.5.12"), # PBKDF2
DerSequence([DerOctetString(salt),
DerInteger(count)])
])
else:
# It must be scrypt
count = prot_params.get("iteration_count", 16384)
scrypt_r = prot_params.get('block_size', 8)
scrypt_p = prot_params.get('parallelization', 1)
key = scrypt(passphrase, salt, key_size, count, scrypt_r, scrypt_p)
kdf_info = DerSequence([
DerObjectId("1.3.6.1.4.1.11591.4.11"), # scrypt
DerSequence([
DerOctetString(salt),
DerInteger(count),
DerInteger(scrypt_r),
DerInteger(scrypt_p)
])
])
# Create cipher and use it
cipher = module.new(key, cipher_mode, iv)
encrypted_data = cipher.encrypt(pad(data, cipher.block_size))
enc_info = DerSequence([DerObjectId(enc_oid), DerOctetString(iv)])
# Result
enc_private_key_info = DerSequence([
# encryptionAlgorithm
DerSequence([
DerObjectId("1.2.840.113549.1.5.13"), # PBES2
DerSequence([kdf_info, enc_info]),
]),
DerOctetString(encrypted_data)
])
return enc_private_key_info.encode()
def setUp(self):
self.rng = Random.new().read
self.key1024 = RSA.generate(1024, self.rng)
def encrypt(self, raw):
raw = self._pad(raw)
iv = Random.new().read(AES.block_size)
cipher = AES.new(self.key, AES.MODE_CBC, iv)
return base64.b64encode(iv + cipher.encrypt(raw))
def encrypt(self, text, key, key_size=256):
text = self.padding(text)
iv = Random.new().read(AES.block_size)
cipher = AES.new(key, AES.MODE_CBC, iv)
return iv + cipher.encrypt(text)
#is socket server file use for response to client
from socket import *
import time
import pyaes
import hashlib
import base64
# import os
# from sys import path
import urllib3
import ctypes
from crypto import Random
arr = [1, 2, 3, 4, 5, 6, 7, 78, 8]
res = Random.new(arr)
print(res)
# ctypes.
s = socket(2, 1)
s.bind(('192.168.1.100', 1234))
s.listen(5)
s.settimeout(10000)
print("runing ...\n")
# data = 'hello world alireza'.encode()
# hashcode = hashlib.shake_128(data)
aes = pyaes.AESModeOfOperationCTR('hello123P{/e3sc}'.encode())
en = aes.encrypt(
'hello world that is your chance for live better than another people for live better'
AES Encryption Demo
This Program illustrates working of AES encryption . HMAC is also used.
This program is written from windows point of view in Python 3.5
Author: Vishvajeet Patil
'''
import Crypto #Same as Crypto package on linux systems.
import sys
sys.modules[
'crypto'] = Crypto #Makes crypto module workable on windows systems
from crypto import Random #Imports cryptographically Secure Random module
from crypto.Cipher import AES #Imports AES cipher
import hmac
import hashlib
#Key and IV(Initialization Vector) generation
key = Random.new().read(AES.block_size)
iv = Random.new().read(AES.block_size)
#Function to pad messages
def pad(s):
'''This function returns the padded message for given parameter string s according to PKCS7 standard
which is used with AES ciphers'''
n = AES.block_size
return s + ((n - len(s) % n) * chr(n - len(s) % n)).encode('UTF-8')
#Function to unpad messages
def unpad(s):
'''This function returns the unpadded version of given parameter string s according to PKCS7 standard
which is used with AES ciphers'''
def generate(): global key key = Random.new().read(AES.block_size) global iv iv = Random.new().read(AES.block_size)
def miller_rabin_test(candidate, iterations, randfunc=None):
"""Perform a Miller-Rabin primality test on an integer.
The test is specified in Section C.3.1 of `FIPS PUB 186-4`__.
:Parameters:
candidate : integer
The number to test for primality.
iterations : integer
The maximum number of iterations to perform before
declaring a candidate a probable prime.
randfunc : callable
An RNG function where bases are taken from.
:Returns:
``Primality.COMPOSITE`` or ``Primality.PROBABLY_PRIME``.
.. __: http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf
"""
if not isinstance(candidate, Integer):
candidate = Integer(candidate)
if candidate in (1, 2, 3, 5):
return PROBABLY_PRIME
if candidate.is_even():
return COMPOSITE
one = Integer(1)
minus_one = Integer(candidate - 1)
if randfunc is None:
randfunc = Random.new().read
# Step 1 and 2
m = Integer(minus_one)
a = 0
while m.is_even():
m >>= 1
a += 1
# Skip step 3
# Step 4
for i in iter_range(iterations):
# Step 4.1-2
base = 1
while base in (one, minus_one):
base = Integer.random_range(min_inclusive=2,
max_inclusive=candidate - 2)
assert (2 <= base <= candidate - 2)
# Step 4.3-4.4
z = pow(base, m, candidate)
if z in (one, minus_one):
continue
# Step 4.5
for j in iter_range(1, a):
z = pow(z, 2, candidate)
if z == minus_one:
break
if z == one:
return COMPOSITE
else:
return COMPOSITE
# Step 5
return PROBABLY_PRIME
import ast
import time
from crypto import Random
from crypto.PublicKey import RSA
from crypto.Cipher import PKCS1_OAEP
start_time = time.time()
random_generator = Random.new().read
# Generates public and private key
key = RSA.generate(1024, random_generator)
# Exporting public key to global
public_key = key.publickey()
encryptor = PKCS1_OAEP.new(public_key)
pause1 = time.time()
# Choosing file to read
message_file = input('Input filename for reading: ')
with open(message_file, 'r') as message:
data1 = message.read()
data1 = str(data1)
data1 = bytes(data1, 'utf-8')
# Encryption data from read file
continue1 = time.time()
encrypted = encryptor.encrypt(data1)
def __init__(self, randfunc=None):
if randfunc is None:
randfunc = Random.new().read
self._randfunc = randfunc