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| import math
import pyaudio
from struct import unpack
from random import shuffle, sample
opzioni = {
"format": pyaudio.paFloat32,
"channels": 2,
"rate": 96000,
"input": True,
"frames_per_buffer": 1024
}
class generator:
def _nums(l, n):
for i in range(0, len(l), n):
chunk = l[i:i+n]
if any(chunk):
yield unpack('>L', chunk)[0]
def random(a, b, n):
audio = pyaudio.PyAudio()
raw_data = audio.open(**opzioni).read(opzioni["rate"] // opzioni["frames_per_buffer"] * int(10*math.log(n)))
audio.terminate()
sequence = generator._nums(raw_data, 4)
sequence = sample(list(sequence), n)
m = max(sequence)
return map(lambda x: a + (b-a) * (x/m), sequence)
def onetimepad(l):
return tuple(map(int, generator.random(0, 2*16, l)))
class VernamCipher:
def __init__(self):
self.max = 2 ** 16
def encryption(self, plaintext):
'''
加密函数
'''
encrypted = []
key = ()
if key is ():
key = generator.onetimepad(len(plaintext))
for i, character in enumerate(plaintext):
encrypted.append(
chr((ord(character) + key[i]) % self.max))
return "".join(encrypted), key
def decryption(self, cyphertext, key):
'''
解密函数
'''
encrypted = []
for i, character in enumerate(cyphertext):
encrypted.append(chr((ord(character) - key[i]) % self.max))
return "".join(encrypted)
t_plain = '12.25 HappyBirthday!'
t = VernamCipher()
print('明文是：', t_plain)
t_cypher, t_key = t.encryption(t_plain)
print('密文是：', t_cypher)
t_result = t.decryption(t_cypher, t_key)
print('解密结果是：', t_result)
|