文件操作 - RAND_DRBG_set_ex_data.pod
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文件: /usr/local/src/openssl-1.1.1w/doc/man3/RAND_DRBG_set_ex_data.pod
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=pod =head1 NAME RAND_DRBG_set_ex_data, RAND_DRBG_get_ex_data, RAND_DRBG_get_ex_new_index - store and retrieve extra data from the DRBG instance =head1 SYNOPSIS #include <openssl/rand_drbg.h> int RAND_DRBG_set_ex_data(RAND_DRBG *drbg, int idx, void *data); void *RAND_DRBG_get_ex_data(const RAND_DRBG *drbg, int idx); int RAND_DRBG_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func); =head1 DESCRIPTION RAND_DRBG_set_ex_data() enables an application to store arbitrary application specific data B<data> in a RAND_DRBG instance B<drbg>. The index B<idx> should be a value previously returned from a call to RAND_DRBG_get_ex_new_index(). RAND_DRBG_get_ex_data() retrieves application specific data previously stored in an RAND_DRBG instance B<drbg>. The B<idx> value should be the same as that used when originally storing the data. For more detailed information see L<CRYPTO_get_ex_data(3)> and L<CRYPTO_set_ex_data(3)> which implement these functions and L<CRYPTO_get_ex_new_index(3)> for generating a unique index. =head1 RETURN VALUES RAND_DRBG_set_ex_data() returns 1 for success or 0 for failure. RAND_DRBG_get_ex_data() returns the previously stored value or NULL on failure. NULL may also be a valid value. =head1 NOTES RAND_DRBG_get_ex_new_index(...) is implemented as a macro and equivalent to CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DRBG,...). =head1 SEE ALSO L<CRYPTO_get_ex_data(3)>, L<CRYPTO_set_ex_data(3)>, L<CRYPTO_get_ex_new_index(3)>, L<RAND_DRBG(7)> =head1 COPYRIGHT Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L<https://www.openssl.org/source/license.html>. =cut
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