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+.\"
+.IX Title "CRYPTO_SET_EX_DATA 1"
+.TH CRYPTO_SET_EX_DATA 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
+.Ve
+.Vb 1
+\& 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\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and
+\&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example.
+.PP
+\&\fB\f(BICRYPTO_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\f(BICRYPTO_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\f(BICRYPTO_set_ex_data()\fB\fR call.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
+.PP
+\&\fB\f(BICRYPTO_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 ERR_get_error(3).
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+RSA_get_ex_new_index(3),
+DSA_get_ex_new_index(3),
+DH_get_ex_new_index(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.