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CRYPTO_set_ex_data.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/crypto.h> \& \& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg); \& \& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" Several OpenSSL structures can have application specific data attached to them. These functions are used internally by OpenSSL to manipulate application specific data attached to a specific structure. .PP These functions should only be used by applications to manipulate \&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\fBnew_func()\fB\fR, \fB\fBfree_func()\fB\fR and \&\fB\fBdup_func()\fB\fR callbacks: as passed to \fB\fBRSA_get_ex_new_index()\fB\fR for example. .PP \&\fB\fBCRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is supplied in the \fBarg\fR parameter and its precise meaning is up to the application. .PP \&\fB\fBCRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data is returned to the application, this will be the same value as supplied to a previous \fB\fBCRYPTO_set_ex_data()\fB\fR call. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fB\fBCRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure. .PP \&\fB\fBCRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also be valid application data but currently it can only fail if given an invalid \fBidx\fR parameter. .PP On failure an error code can be obtained from \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBRSA_get_ex_new_index\fR\|(3), \&\fBDSA_get_ex_new_index\fR\|(3), \&\fBDH_get_ex_new_index\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBCRYPTO_set_ex_data()\fR and \fBCRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0.
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