NAME¶
SSL_get_ex_data_X509_STORE_CTX_idx - get ex_data index to access SSL structure
from X509_STORE_CTX
SYNOPSIS¶
#include <openssl/ssl.h>
int SSL_get_ex_data_X509_STORE_CTX_idx(void);
DESCRIPTION¶
SSL_get_ex_data_X509_STORE_CTX_idx() returns the index number under which
the pointer to the SSL object is stored into the X509_STORE_CTX object.
NOTES¶
Whenever a X509_STORE_CTX object is created for the verification of the peers
certificate during a handshake, a pointer to the SSL object is stored into the
X509_STORE_CTX object to identify the connection affected. To retrieve this
pointer the
X509_STORE_CTX_get_ex_data() function can be used with the
correct index. This index is globally the same for all X509_STORE_CTX objects
and can be retrieved using
SSL_get_ex_data_X509_STORE_CTX_idx(). The
index value is set when
SSL_get_ex_data_X509_STORE_CTX_idx() is first
called either by the application program directly or indirectly during other
SSL setup functions or during the handshake.
The value depends on other index values defined for X509_STORE_CTX objects
before the SSL index is created.
RETURN VALUES¶
- >=0
- The index value to access the pointer.
- <0
- An error occurred, check the error stack for a detailed error
message.
EXAMPLES¶
The index returned from
SSL_get_ex_data_X509_STORE_CTX_idx() allows to
access the SSL object for the connection to be accessed during the
verify_callback() when checking the peers certificate. Please check the
example in
SSL_CTX_set_verify(3),
SEE ALSO¶
ssl(3),
SSL_CTX_set_verify(3),
CRYPTO_set_ex_data(3)