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.\" ========================================================================
.\"
.IX Title "CRYPTO_set_ex_data 3"
.TH CRYPTO_set_ex_data 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"
CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/crypto.h>
\&
\& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
\&
\& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Several OpenSSL structures can have application specific data attached to them.
These functions are used internally by OpenSSL to manipulate application
specific data attached to a specific structure.
.PP
These functions should only be used by applications to manipulate
\&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\fBnew_func()\fB\fR, \fB\fBfree_func()\fB\fR and
\&\fB\fBdup_func()\fB\fR callbacks: as passed to \fB\fBRSA_get_ex_new_index()\fB\fR for example.
.PP
\&\fB\fBCRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is
supplied in the \fBarg\fR parameter and its precise meaning is up to the
application.
.PP
\&\fB\fBCRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data
is returned to the application, this will be the same value as supplied to
a previous \fB\fBCRYPTO_set_ex_data()\fB\fR call.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fB\fBCRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
.PP
\&\fB\fBCRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also
be valid application data but currently it can only fail if given an invalid \fBidx\fR
parameter.
.PP
On failure an error code can be obtained from \fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBRSA_get_ex_new_index\fR\|(3),
\&\fBDSA_get_ex_new_index\fR\|(3),
\&\fBDH_get_ex_new_index\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBCRYPTO_set_ex_data()\fR and \fBCRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.