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140 .IX Title "CRYPTO_set_ex_data 3"
141 .TH CRYPTO_set_ex_data 3 "0.9.6e" "2000-04-13" "OpenSSL"
144 CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
146 .IX Header "SYNOPSIS"
148 \& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
151 \& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
154 .IX Header "DESCRIPTION"
155 Several OpenSSL structures can have application specific data attached to them.
156 These functions are used internally by OpenSSL to manipulate application
157 specific data attached to a specific structure.
159 These functions should only be used by applications to manipulate
160 \&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and
161 \&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example.
163 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is
164 supplied in the \fBarg\fR parameter and its precise meaning is up to the
167 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data
168 is returned to the application, this will be the same value as supplied to
169 a previous \fB\f(BICRYPTO_set_ex_data()\fB\fR call.
171 .IX Header "RETURN VALUES"
172 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
174 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also
175 be valid application data but currently it can only fail if given an invalid \fBidx\fR
178 On failure an error code can be obtained from ERR_get_error(3).
180 .IX Header "SEE ALSO"
181 RSA_get_ex_new_index(3),
182 DSA_get_ex_new_index(3),
183 DH_get_ex_new_index(3)
186 \&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.