Python Paramiko, Error: CryptographyDeprecationWarning: encode_point has been deprecated on EllipticCurvePublicNumbers and will be removed in a future version.

发表于： 2019年11月16日 2019年11月16日
分类： Python
标签： cryptography, CryptographyDeprecationWarning: encode_point has been deprecated on EllipticCurvePublicNumbers and will be removed in a future version., error, Linux, paramiko, Python, Remote, 远程, 远程控制, 远程访问, 错误

今天Python使用Paramiko连接远端服务器的时候遇到了如题所示的错误，具体如下所示：

C:\Python27\lib\site-packages\paramiko\kex_ecdh_nist.py:39: CryptographyDeprecationWarning: encode_point has been deprecated on EllipticCurvePublicNumbers and will be removed in a future version. Please use EllipticCurvePublicKey.public_bytes to obtain both compressed and uncompressed point encoding.
  m.add_string(self.Q_C.public_numbers().encode_point())
C:\Python27\lib\site-packages\paramiko\kex_ecdh_nist.py:96: CryptographyDeprecationWarning: Support for unsafe construction of public numbers from encoded data will be removed in a future version. Please use EllipticCurvePublicKey.from_encoded_point
  self.curve, Q_S_bytes
C:\Python27\lib\site-packages\paramiko\kex_ecdh_nist.py:111: CryptographyDeprecationWarning: encode_point has been deprecated on EllipticCurvePublicNumbers and will be removed in a future version. Please use EllipticCurvePublicKey.public_bytes to obtain both compressed and uncompressed point encoding.
  hm.add_string(self.Q_C.public_numbers().encode_point())

C:\Python27\lib\site-packages\paramiko\kex_ecdh_nist.py:39: CryptographyDeprecationWarning: encode_point has been deprecated on EllipticCurvePublicNumbers and will be removed in a future version. Please use EllipticCurvePublicKey.public_bytes to obtain both compressed and uncompressed point encoding.

m.add_string(self.Q_C.public_numbers().encode_point())

C:\Python27\lib\site-packages\paramiko\kex_ecdh_nist.py:96: CryptographyDeprecationWarning: Support for unsafe construction of public numbers from encoded data will be removed in a future version. Please use EllipticCurvePublicKey.from_encoded_point

self.curve, Q_S_bytes

C:\Python27\lib\site-packages\paramiko\kex_ecdh_nist.py:111: CryptographyDeprecationWarning: encode_point has been deprecated on EllipticCurvePublicNumbers and will be removed in a future version. Please use EllipticCurvePublicKey.public_bytes to obtain both compressed and uncompressed point encoding.

hm.add_string(self.Q_C.public_numbers().encode_point())

发生该问题的原因是因为：

Paramiko所依赖的模块包cryptography版本过高（大于2.4.2）
因为2.4.2以上的版本（不包含2.4.2）弃用了一些Paramiko需要用到的方法。

因此，解决该问题的方法是，将项目中的cryptography先卸载，然后再安装指定版本2.4.2的cryptography，即可解决。

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