1CRYPTO_set_ex_data(3)               OpenSSL              CRYPTO_set_ex_data(3)
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NAME

6       CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific
7       data functions
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SYNOPSIS

10        #include <openssl/crypto.h>
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12        int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
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14        void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
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DESCRIPTION

17       Several OpenSSL structures can have application specific data attached
18       to them.  These functions are used internally by OpenSSL to manipulate
19       application specific data attached to a specific structure.
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21       These functions should only be used by applications to manipulate
22       CRYPTO_EX_DATA structures passed to the new_func(), free_func() and
23       dup_func() callbacks: as passed to RSA_get_ex_new_index() for example.
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25       CRYPTO_set_ex_data() is used to set application specific data, the data
26       is supplied in the arg parameter and its precise meaning is up to the
27       application.
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29       CRYPTO_get_ex_data() is used to retrieve application specific data. The
30       data is returned to the application, this will be the same value as
31       supplied to a previous CRYPTO_set_ex_data() call.
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RETURN VALUES

34       CRYPTO_set_ex_data() returns 1 on success or 0 on failure.
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36       CRYPTO_get_ex_data() returns the application data or 0 on failure. 0
37       may also be valid application data but currently it can only fail if
38       given an invalid idx parameter.
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40       On failure an error code can be obtained from ERR_get_error(3).
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SEE ALSO

43       RSA_get_ex_new_index(3), DSA_get_ex_new_index(3),
44       DH_get_ex_new_index(3)
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HISTORY

47       CRYPTO_set_ex_data() and CRYPTO_get_ex_data() have been available since
48       SSLeay 0.9.0.
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521.0.2o                            2018-03-27             CRYPTO_set_ex_data(3)
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