python之微信小程序密码解密

尹冠宇
2023-12-01

1、在子应用内创建utils.py并添加以下内容

from Crypto.Cipher import AES
from binascii import b2a_hex, a2b_hex

class Prpcrypt():
	def __init__(self, key, iv):
    	self.key = key
    	self.iv = iv
    	self.mode = AES.MODE_CBC

    	# 加密函数,如果text不是16的倍数【加密文本text必须为16的倍数!】,那就补足为16的倍数

	def encrypt(self, text):
    	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32(AES-256)Bytes 长度.目前AES-128足够用
    	length = 16
    	count = len(text)
    	if (count % length != 0):
        	add = length - (count % length)
    	else:
        	add = 0
    	text = text + ('\0' * add)
    	text = text.encode()
    	self.ciphertext = cryptor.encrypt(text)
    	# 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16进制字符串 ,当然也可以转换为base64加密的内容,可以使用b2a_base64(self.ciphertext)
    	return b2a_hex(self.ciphertext)
    	
	# 解密后,去掉补足的空格用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'.encode())

2、views.py

from .utils import Prpcrypt
class UserView(APIView):
	"""解密密码"""

	def get(self, request):
    	# 加密的密码
    	aes_password = request.GET.get('aes_password')

    	# openid
    	openid = request.GET.get('openid')

    	# 向量
    	iv = request.GET.get('vinum')
    	
    	# key
    	key = sha1(iv.encode()).hexdigest()
    	
    	# 截取并编码向量
    	iv = iv[0:16]
    	iv = iv.encode()

    	# 截取并编码key
    	key = key[0:16]
    	key = key.encode()
    	
    	# 初始化密钥
    	pc = Prpcrypt(key, iv)  # 初始化密钥
    	password = pc.decrypt(aes_password)
    	password = password.decode()
	
		data = {
    		‘password':password
    	}

    	return Response(data=data, status=status.HTTP_200_OK)
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