如何获取PEM编码的X509证书作为C ++字符串使用openssl？ [英] How to get PEM encoded X509 certificate as C++ string using openssl?

问题描述

我有一个带有自签名证书的openssl X509结构。我需要从这个结构获得一个PEM格式化的C ++字符串。我需要使用什么openssl API来实现这一点？

I have a openssl X509 structure with a self signed certificate. I need to get a PEM formatted C++ string from this structure. What are the openssl APIs that I need to use to achieve this?

我试着在 https://www.codeblog.org/gonzui/markup/openssl-0.9.8a/demos/x509/mkcert .c 。此程序显示将PEM格式的证书写入文件的方法。如果没有其他方法，我可以将这个文件的内容读入C ++字符串。

I tried following the example program at https://www.codeblog.org/gonzui/markup/openssl-0.9.8a/demos/x509/mkcert.c. This program shows a way to write the certificate in PEM format to a file. I can read the contents of this file into a C++ string if there is no other way to do it.

推荐答案

openssl x509命令的源代码，看看它如何执行读取DER编码文件并写入PEM的操作：

look at the source of the openssl x509 command and see how it does the operation to read a DER encoded file and writes a PEM one - ie:

openssl x509 -in mycert.der -inform DER -out mycert.pem

cli的代码utils很容易遵循

The code of the cli utils is pretty easy to follow

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