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.\" ======================================================================== |
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.\" |
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.IX Title "CRYPTO_set_ex_data 3" |
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.TH CRYPTO_set_ex_data 3 "2016-09-22" "1.0.1u" "OpenSSL" |
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes |
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.\" way too many mistakes in technical documents. |
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.if n .ad l |
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.nh |
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.SH "NAME" |
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CRYPTO_set_ex_data, CRYPTO_get_ex_data \- internal application specific data functions |
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.SH "SYNOPSIS" |
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.IX Header "SYNOPSIS" |
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.Vb 1 |
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\& #include <openssl/crypto.h> |
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\& |
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\& int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg); |
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\& |
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\& void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx); |
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.Ve |
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.SH "DESCRIPTION" |
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.IX Header "DESCRIPTION" |
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Several OpenSSL structures can have application specific data attached to them. |
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These functions are used internally by OpenSSL to manipulate application |
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specific data attached to a specific structure. |
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.PP |
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These functions should only be used by applications to manipulate |
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\&\fB\s-1CRYPTO_EX_DATA\s0\fR structures passed to the \fB\f(BInew_func()\fB\fR, \fB\f(BIfree_func()\fB\fR and |
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\&\fB\f(BIdup_func()\fB\fR callbacks: as passed to \fB\f(BIRSA_get_ex_new_index()\fB\fR for example. |
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.PP |
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\&\fB\f(BICRYPTO_set_ex_data()\fB\fR is used to set application specific data, the data is |
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supplied in the \fBarg\fR parameter and its precise meaning is up to the |
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application. |
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.PP |
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\&\fB\f(BICRYPTO_get_ex_data()\fB\fR is used to retrieve application specific data. The data |
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is returned to the application, this will be the same value as supplied to |
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a previous \fB\f(BICRYPTO_set_ex_data()\fB\fR call. |
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.SH "RETURN VALUES" |
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.IX Header "RETURN VALUES" |
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\&\fB\f(BICRYPTO_set_ex_data()\fB\fR returns 1 on success or 0 on failure. |
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.PP |
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\&\fB\f(BICRYPTO_get_ex_data()\fB\fR returns the application data or 0 on failure. 0 may also |
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be valid application data but currently it can only fail if given an invalid \fBidx\fR |
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parameter. |
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.PP |
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On failure an error code can be obtained from \fIERR_get_error\fR\|(3). |
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.SH "SEE ALSO" |
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.IX Header "SEE ALSO" |
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\&\fIRSA_get_ex_new_index\fR\|(3), |
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\&\fIDSA_get_ex_new_index\fR\|(3), |
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\&\fIDH_get_ex_new_index\fR\|(3) |
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.SH "HISTORY" |
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.IX Header "HISTORY" |
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\&\fICRYPTO_set_ex_data()\fR and \fICRYPTO_get_ex_data()\fR have been available since SSLeay 0.9.0. |
