SSL_CTX_add_extra_chain_cert(3) add certificate to chain


#include <openssl/ssl.h>
long SSL_CTX_add_extra_chain_cert(SSL_CTX ctx, X509 *x509)


SSL_CTX_add_extra_chain_cert() adds the certificate x509 to the certificate chain presented together with the certificate. Several certificates can be added one after the other.


When constructing the certificate chain, the chain will be formed from these certificates explicitly specified. If no chain is specified, the library will try to complete the chain from the available CA certificates in the trusted CA storage, see SSL_CTX_load_verify_locations(3).

The x509 certificate provided to SSL_CTX_add_extra_chain_cert() will be freed by the library when the SSL_CTX is destroyed. An application should not free the x509 object.


Only one set of extra chain certificates can be specified per SSL_CTX structure. Different chains for different certificates (for example if both RSA and DSA certificates are specified by the same server) or different SSL structures with the same parent SSL_CTX cannot be specified using this function. For more flexibility functions such as SSL_add1_chain_cert() should be used instead.


SSL_CTX_add_extra_chain_cert() returns 1 on success. Check out the error stack to find out the reason for failure otherwise.