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1 .\" $NetBSD: CRYPTO_set_ex_data.3,v 1.14 2015/06/12 17:01:13 christos Exp $
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135 .\" ========================================================================
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137 .IX Title "CRYPTO_set_ex_data 3"
138 .TH CRYPTO_set_ex_data 3 "2009-07-19" "1.0.1n" "OpenSSL"
139 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
140 .\" way too many mistakes in technical documents.
141 .if n .ad l
142 .nh
143 .SH "NAME"
144 CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
145 .SH "LIBRARY"
146 libcrypto, -lcrypto
147 .SH "SYNOPSIS"
148 .IX Header "SYNOPSIS"
149 .Vb 1
150 \& #include <openssl/crypto.h>
151 \&
152 \& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
153 \&
154 \& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
155 .Ve
156 .SH "DESCRIPTION"
157 .IX Header "DESCRIPTION"
158 Several OpenSSL structures can have application specific data attached to them.
159 These functions are used internally by OpenSSL to manipulate application
160 specific data attached to a specific structure.
161 .PP
162 These functions should only be used by applications to manipulate
163 \&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and
164 \&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example.
165 .PP
166 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is
167 supplied in the \fBarg\fR parameter and its precise meaning is up to the
168 application.
169 .PP
170 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data
171 is returned to the application, this will be the same value as supplied to
172 a previous \fB\f(BICRYPTO_set_ex_data()\fB\fR call.
173 .SH "RETURN VALUES"
174 .IX Header "RETURN VALUES"
175 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
176 .PP
177 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also
178 be valid application data but currently it can only fail if given an invalid \fBidx\fR
179 parameter.
180 .PP
181 On failure an error code can be obtained from \fIERR_get_error\fR\|(3).
182 .SH "SEE ALSO"
183 .IX Header "SEE ALSO"
184 \&\fIRSA_get_ex_new_index\fR\|(3),
185 \&\fIDSA_get_ex_new_index\fR\|(3),
186 \&\fIDH_get_ex_new_index\fR\|(3)
187 .SH "HISTORY"
188 .IX Header "HISTORY"
189 \&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.