=pod
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=head1 NAME
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CRYPTO_set_ex_data, CRYPTO_get_ex_data - internal application specific data functions
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=head1 SYNOPSIS
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#include <openssl/crypto.h>
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int CRYPTO_set_ex_data(CRYPTO_EX_DATA *r, int idx, void *arg);
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void *CRYPTO_get_ex_data(CRYPTO_EX_DATA *r, int idx);
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=head1 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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These functions should only be used by applications to manipulate
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B<CRYPTO_EX_DATA> structures passed to the B<new_func()>, B<free_func()> and
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B<dup_func()> callbacks: as passed to B<RSA_get_ex_new_index()> for example.
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B<CRYPTO_set_ex_data()> is used to set application specific data, the data is
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supplied in the B<arg> parameter and its precise meaning is up to the
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application.
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B<CRYPTO_get_ex_data()> 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 B<CRYPTO_set_ex_data()> call.
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=head1 RETURN VALUES
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B<CRYPTO_set_ex_data()> returns 1 on success or 0 on failure.
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B<CRYPTO_get_ex_data()> 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 B<idx>
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parameter.
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On failure an error code can be obtained from L<ERR_get_error(3)|ERR_get_error(3)>.
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=head1 SEE ALSO
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L<RSA_get_ex_new_index(3)|RSA_get_ex_new_index(3)>,
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L<DSA_get_ex_new_index(3)|DSA_get_ex_new_index(3)>,
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L<DH_get_ex_new_index(3)|DH_get_ex_new_index(3)>
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=head1 HISTORY
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CRYPTO_set_ex_data() and CRYPTO_get_ex_data() have been available since SSLeay 0.9.0.
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=cut
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