Signxml验证失败

Question

我遇到的情况是必须签名一些数据并通过TCP套接字将其发送到客户端。

所以在服务器上，我使用xmlsign对其进行签名并将其作为字符串发送

#in server
signed_xml_obj = XMLSigner().sign(root, key=PRIVATEKEY)
xml_str = ElementTree.tostring(signed_xml_obj)
#sendtoclient(xml_str)

在客户端中比从字符串创建ElementTree.Element并尝试验证它，但是失败

#somewhere in client
signed_xml_obj = ElementTree.fromstring(signiautreString)
XMLVerifier().verify(signed_xml_obj, x509_cert=cer)

追溯

    Traceback (most recent call last):
  File "/eltioni/.local/lib/python3.7/site-packages/signxml/__init__.py", line 729, in verify
    verify(signing_cert, raw_signature, signed_info_c14n, signature_digest_method)
  File "/usr/lib/python3/dist-packages/OpenSSL/crypto.py", line 2928, in verify
    _raise_current_error()
  File "/usr/lib/python3/dist-packages/OpenSSL/_util.py", line 54, in exception_from_error_queue
    raise exception_type(errors)
OpenSSL.crypto.Error: [('rsa routines', 'int_rsa_verify', 'bad signature')]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "sig.py", line 15, in <module>
    XMLVerifier().verify(xml2, x509_cert=cert)
  File "/eltioni/.local/lib/python3.7/site-packages/signxml/__init__.py", line 735, in verify
    raise InvalidSignature("Signature verification failed: {}".format(reason))
signxml.exceptions.InvalidSignature: Signature verification failed: bad signature

我还注意到的是，当我在服务器上打印signed_xml_obj时，我得到了

print(signed_xml_obj)
#<Element Student at 0x7ff94085f188>

当我在客户端中打印signed_xml_obj时，我得到“学生”（带引号）

print(signed_xml_obj)
#<Element 'Student' at 0x7ff94085f188>