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Edit File: SSL_get_ex_data_X509_STORE_CTX_idx.3

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.IX Title "SSL_get_ex_data_X509_STORE_CTX_idx 3"
.TH SSL_get_ex_data_X509_STORE_CTX_idx 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
SSL_get_ex_data_X509_STORE_CTX_idx \- get ex_data index to access SSL structure
from X509_STORE_CTX
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_get_ex_data_X509_STORE_CTX_idx(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_get_ex_data_X509_STORE_CTX_idx()\fR returns the index number under which
the pointer to the \s-1SSL\s0 object is stored into the X509_STORE_CTX object.
.SH "NOTES"
.IX Header "NOTES"
Whenever a X509_STORE_CTX object is created for the verification of the
peers certificate during a handshake, a pointer to the \s-1SSL\s0 object is
stored into the X509_STORE_CTX object to identify the connection affected.
To retrieve this pointer the \fBX509_STORE_CTX_get_ex_data()\fR 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
\&\fBSSL_get_ex_data_X509_STORE_CTX_idx()\fR. The index value is set when
\&\fBSSL_get_ex_data_X509_STORE_CTX_idx()\fR is first called either by the application
program directly or indirectly during other \s-1SSL\s0 setup functions or during
the handshake.
.PP
The value depends on other index values defined for X509_STORE_CTX objects
before the \s-1SSL\s0 index is created.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
.IP ">=0" 4
.IX Item ">=0"
The index value to access the pointer.
.IP "<0" 4
.IX Item "<0"
An error occurred, check the error stack for a detailed error message.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
The index returned from \fBSSL_get_ex_data_X509_STORE_CTX_idx()\fR allows to
access the \s-1SSL\s0 object for the connection to be accessed during the
\&\fBverify_callback()\fR when checking the peers certificate. Please check
the example in \fBSSL_CTX_set_verify\fR\|(3),
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBssl\fR\|(3), \fBSSL_CTX_set_verify\fR\|(3),
\&\fBCRYPTO_set_ex_data\fR\|(3)