Merge branch 'vendor/OPENSSL'
[dragonfly.git] / secure / lib / libcrypto / man / CRYPTO_set_ex_data.3
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132.\" ========================================================================
133.\"
134.IX Title "CRYPTO_set_ex_data 3"
fc468453 135.TH CRYPTO_set_ex_data 3 "2010-02-27" "0.9.8m" "OpenSSL"
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136.\" For nroff, turn off justification. Always turn off hyphenation; it makes
137.\" way too many mistakes in technical documents.
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140.SH "NAME"
141CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions
142.SH "SYNOPSIS"
8b0cefbb 143.IX Header "SYNOPSIS"
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144.Vb 1
145\& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
e257b235 146\&
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147\& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
148.Ve
149.SH "DESCRIPTION"
8b0cefbb 150.IX Header "DESCRIPTION"
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151Several OpenSSL structures can have application specific data attached to them.
152These functions are used internally by OpenSSL to manipulate application
153specific data attached to a specific structure.
154.PP
155These functions should only be used by applications to manipulate
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156\&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and
157\&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example.
984263bc 158.PP
8b0cefbb 159\&\fB\f(BICRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is
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160supplied in the \fBarg\fR parameter and its precise meaning is up to the
161application.
162.PP
8b0cefbb 163\&\fB\f(BICRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data
984263bc 164is returned to the application, this will be the same value as supplied to
8b0cefbb 165a previous \fB\f(BICRYPTO_set_ex_data()\fB\fR call.
984263bc 166.SH "RETURN VALUES"
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167.IX Header "RETURN VALUES"
168\&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure.
984263bc 169.PP
8b0cefbb 170\&\fB\f(BICRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also
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171be valid application data but currently it can only fail if given an invalid \fBidx\fR
172parameter.
173.PP
8b0cefbb 174On failure an error code can be obtained from \fIERR_get_error\fR\|(3).
984263bc 175.SH "SEE ALSO"
74dab6c2 176.IX Header "SEE ALSO"
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177\&\fIRSA_get_ex_new_index\fR\|(3),
178\&\fIDSA_get_ex_new_index\fR\|(3),
179\&\fIDH_get_ex_new_index\fR\|(3)
180.SH "HISTORY"
984263bc 181.IX Header "HISTORY"
8b0cefbb 182\&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.