Python-rsa.pkcs1.DecryptionError: Decryption failed

问题描述：

前端使用 JSEncrypt 对数据进行 RSA 加密后经 axios 传回Python后端，当后端进行解密时发生以下错误：

...
  File "C:\Users\wei\Desktop\MiniPlayer-Server\.\utils\security.py", line 57, in rsa_decrypt    
    return rsa.decrypt(data,key).decode('utf-8')
  File "C:\Python310\lib\site-packages\rsa\pkcs1.py", line 265, in decrypt
    raise DecryptionError("Decryption failed")
rsa.pkcs1.DecryptionError: Decryption failed

解密函数如下代码块：

def rsa_decrypt(data:bytes):
    if RSA_PRI_KEY is None:
        with open('private.pem','rb') as privateFile:
            key = rsa.PrivateKey.load_pkcs1(privateFile.read())
    return rsa.decrypt(data,key).decode('utf-8')

很明显，如果需要解密数据，传入解密函数的数据必须为bytes类型，于是很多人就使用str.encode('utf-8')进行编码。

可是！由前端 JSEncrypt 进行加密后的数据还会进行一次base64编码，因此只要像以下方法操作即可：

import base64

passwd = rsa_decrypt(base64.b64decode(data))

def rsa_decrypt(data:bytes):
    if RSA_PRI_KEY is None:
        with open('private.pem','rb') as privateFile:
            key = rsa.PrivateKey.load_pkcs1(privateFile.read())
    return rsa.decrypt(data,key).decode('utf-8')