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126 .IX Title "CRYPTO_set_ex_data 3"
127 .TH CRYPTO_set_ex_data 3 "2012-05-10" "1.0.1c" "OpenSSL"
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133 CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/crypto.h>
139 \& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
141 \& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
144 .IX Header "DESCRIPTION"
145 Several OpenSSL structures can have application specific data attached to them.
146 These functions are used internally by OpenSSL to manipulate application
147 specific data attached to a specific structure.
149 These functions should only be used by applications to manipulate
150 \&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and
151 \&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example.
153 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is
154 supplied in the \fBarg\fR parameter and its precise meaning is up to the
157 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data
158 is returned to the application, this will be the same value as supplied to
159 a previous \fB\f(BICRYPTO_set_ex_data()\fB\fR call.
161 .IX Header "RETURN VALUES"
162 \&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
164 \&\fB\f(BICRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also
165 be valid application data but currently it can only fail if given an invalid \fBidx\fR
168 On failure an error code can be obtained from \fIERR_get_error\fR\|(3).
170 .IX Header "SEE ALSO"
171 \&\fIRSA_get_ex_new_index\fR\|(3),
172 \&\fIDSA_get_ex_new_index\fR\|(3),
173 \&\fIDH_get_ex_new_index\fR\|(3)
176 \&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.