from Crypto.Cipher import AES
import base64
class PrpCrypt(object):
def __init__(self, key):
self.key = bytes.fromhex(key)
self.mode = AES.MODE_CBC # 这里使用的16个1作为iv,亦可动态生成可变iv self.iv = ‘1111111111111111‘.encode(‘utf-8‘)
def encrypt(self, text):
text = text.encode(‘utf-8‘)
cryptor = AES.new(self.key, self.mode, self.iv)
# 这里密钥key 长度必须为16(AES-128),
# 24(AES-192),或者32 (AES-256)Bytes 长度
# 目前AES-128 足够目前使用
length = 16
count = len(text)
if count < length:
add = (length - count)
# \0 backspace
# text = text + (‘\0‘ * add)
text = text + (‘\01‘ * add).encode(‘utf-8‘)
elif count > length:
add = (length - (count % length))
# text = text + (‘\0‘ * add)
text = text + (‘\01‘ * add).encode(‘utf-8‘)
a=cryptor.encrypt(text)
self.ciphertext = self.iv+a
# 因为AES加密时候得到的字符串不一定是ascii字符集的,输出到终端或者保存时候可能存在问题
# 所以这里统一把加密后的字符串转化为base64
return str(base64.b64encode(self.ciphertext),‘utf-8‘)
def decrypt(self, text):
iv = base64.b64decode(text)[0:16]
encry_text = base64.b64decode(text)[16:]
cryptor = AES.new(self.key, self.mode, iv)
plain_text = cryptor.decrypt(encry_text)
# return plain_text.rstrip(‘\0‘)
return str(plain_text, ‘utf-8‘).rstrip(‘\01‘)
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