If you load it into cryptography you can serialize to DER using the public_bytes method using the appropriate encoding. You can see the docs for this method here: https://cryptography.io/en/latest/x509/reference/#cryptography.x509.Certificate.public_bytes
-Paul (reaperhulk) > On Apr 8, 2020, at 7:00 AM, Sawyer Liu <sawyer....@nxp.com> wrote: > > > Hello, > I want to know how I can convert PEM file of X509 to DER file. Thanks. > > Best Regards > Sawyer Liu(刘维峰) > > Microcontrollers, NXP Semiconductors > 23/F, Exchange Building, No.118 Jianguo Road, Chaoyang District, Beijing, > P.R.C 100022 > 中国北京市朝阳区建国路乙118号京汇大厦23层 邮编：100022 > Tel: 86-10-58798328, Fax: 86-10-58798010, Mobile: 86-1800 112 6984 > E-mail: sawyer....@nxp.com > > _______________________________________________ > Cryptography-dev mailing list > Cryptography-dev@python.org > https://mail.python.org/mailman/listinfo/cryptography-dev
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