How to get optional certificate in openssl -

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i used openssl create smime.

i have valid certificate.i tried parse certificate using following function 

int pkcs12_parse(pkcs12 *p12, const char *pass, evp_pkey **pkey, x509 **cert, stack_of(x509) **ca);

the certificate parsed , able pkey , cert values.but ca comes out null.

how stack_of(x509) value certificate. want use stack_of(x509) value in pkcs7_sign function.

if ca comes out null, have no additional certificates in pkcs12 structure. not need additional certificates - if certificate signed directly ca certificate known recipient, can supply certs = null pkcs7_sign() , no additional certificates included in signed message.


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