How to use pkcs12 in SSL library

[Kin Jun]

Hello friends:
    How are you!  I am Kinj.
    I am a beginner in OpenSSL. I am trying to realize client authentication
    with SSL library in my application.

    I suceeded in sending to a server by using .PEM file as follows:
          SSL_CTX_use_certificate_file(ctx, MyClient.pem, SSL_FILETYPE_PEM);
          SSL_CTX_use_RSAPrivateKey_file(ctx, MyPrivateKey.pem,
SSL_FILETYPE_PEM);

   Now , I try to use  pkcs12 format certificate file to access to the
server.
   But in the OpenSSL document , there are a lot of information like this:
        "....The certificates must be in PEM format.... "

   What!  How about pkcs12 ?
   My question is : How to use pkcs12 format certificates in SSL functions
for client authentication?
        --Is OpenSSL library not supporting pkcs12 format for client
authentication?
        --Which function can be used for the above purpose? and How to do
it?

    I need your advice.

    Thank you for your help in advance.


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