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131 .IX Title "CRYPTO_set_ex_data 3"
132 .TH CRYPTO_set_ex_data 3 "2009-07-23" "0.9.8k" "OpenSSL"
133 .SH "NAME"
134 CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
135 .SH "SYNOPSIS"
136 .IX Header "SYNOPSIS"
137 .Vb 1
138 \& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
139 .Ve
140 .PP
141 .Vb 1
142 \& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
143 .Ve
144 .SH "DESCRIPTION"
145 .IX Header "DESCRIPTION"
146 Several OpenSSL structures can have application specific data attached to them.
147 These functions are used internally by OpenSSL to manipulate application
148 specific data attached to a specific structure.
149 .PP
150 These functions should only be used by applications to manipulate
151 \&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and
152 \&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example.
153 .PP
154 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is
155 supplied in the \fBarg\fR parameter and its precise meaning is up to the
156 application.
157 .PP
158 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data
159 is returned to the application, this will be the same value as supplied to
160 a previous \fB\f(BICRYPTO_set_ex_data()\fB\fR call.
161 .SH "RETURN VALUES"
162 .IX Header "RETURN VALUES"
163 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
164 .PP
165 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also
166 be valid application data but currently it can only fail if given an invalid \fBidx\fR
167 parameter.
168 .PP
169 On failure an error code can be obtained from \fIERR_get_error\fR\|(3).
170 .SH "SEE ALSO"
171 .IX Header "SEE ALSO"
172 \&\fIRSA_get_ex_new_index\fR\|(3),
173 \&\fIDSA_get_ex_new_index\fR\|(3),
174 \&\fIDH_get_ex_new_index\fR\|(3)
175 .SH "HISTORY"
176 .IX Header "HISTORY"
177 \&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.