Python如何實現AES加密與解密

import base64
from Crypto.Cipher import AES


# 密鑰（key）, 密斯偏移量（iv） CBC模式加密

def AES_Encrypt(key, data):
  vi = '0102030405060708'
  pad = lambda s: s + (16 - len(s) % 16) * chr(16 - len(s) % 16)
  data = pad(data)
  # 字符串補位
  cipher = AES.new(key.encode('utf8'), AES.MODE_CBC, vi.encode('utf8'))
  encryptedbytes = cipher.encrypt(data.encode('utf8'))
  # 加密后得到的是bytes類型的數據
  encodestrs = base64.b64encode(encryptedbytes)
  # 使用Base64進行編碼,返回byte字符串
  enctext = encodestrs.decode('utf8')
  # 對byte字符串按utf-8進行解碼
  return enctext


def AES_Decrypt(key, data):
  vi = '0102030405060708'
  data = data.encode('utf8')
  encodebytes = base64.decodebytes(data)
  # 將加密數據轉換位bytes類型數據
  cipher = AES.new(key.encode('utf8'), AES.MODE_CBC, vi.encode('utf8'))
  text_decrypted = cipher.decrypt(encodebytes)
  unpad = lambda s: s[0:-s[-1]]
  text_decrypted = unpad(text_decrypted)
  # 去補位
  text_decrypted = text_decrypted.decode('utf8')
  return text_decrypted


key = '0CoJUm6Qyw8W8jud' #自己密鑰
data = 'sdadsdsdsfd' #需要加密的內容
AES_Encrypt(key, data)
enctext = AES_Encrypt(key, data)
print(enctext)
text_decrypted = AES_Decrypt(key, enctext)
print(text_decrypted)

#!/usr/bin/env python
#encoding=‘utf-8'
from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex
from Crypto import Random

class PrpCrypt(object):

  def __init__(self, key):
    self.key = key.encode('utf-8')
    self.mode = AES.MODE_CBC
    self.iv = Random.new().read(AES.block_size)

  # 加密函數，如果text不足16位就用空格補足為16位，
  # 如果大于16當時不是16的倍數，那就補足為16的倍數。
  def encrypt(self, text):
    text = text.encode('utf-8')

    cryptor = AES.new(self.key, self.mode,self.iv)
    # 這里密鑰key 長度必須為16（AES-128）,
    # 24（AES-192）,或者32 （AES-256）Bytes 長度
    # 目前AES-128 足夠目前使用
    length = 16
    count = len(text)
    if count < length:
      add = (length - count)
      # \0 backspace
      # text = text + ('\0' * add)
      text = text + ('\0' * add).encode('utf-8')
    elif count > length:
      add = (length - (count % length))
      # text = text + ('\0' * add)
      text = text + ('\0' * add).encode('utf-8')
    self.ciphertext = cryptor.encrypt(text)
    # 因為AES加密時候得到的字符串不一定是ascii字符集的，輸出到終端或者保存時候可能存在問題
    # 所以這里統一把加密后的字符串轉化為16進制字符串
    return b2a_hex(self.ciphertext)

  # 解密后，去掉補足的空格用strip() 去掉
  def decrypt(self, text):
    cryptor = AES.new(self.key, self.mode, self.iv)
    plain_text = cryptor.decrypt(a2b_hex(text))
    # return plain_text.rstrip('\0')
    return bytes.decode(plain_text).rstrip('\0')


if __name__ == '__main__':
  pc = PrpCrypt('0CoJUm6Qyw8W8jud') # 初始化密鑰
  data = input("請輸入待加密數據：")#
  e = pc.encrypt(data) # 加密
  d = pc.decrypt(e).encode() # 解密
  print("加密:", e)
  print("解密:", d)