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3dbf824380
There was recently an instance where a user was confused by the deprecation warnings in the docs. They believed the warning applied to the immediately preceding function declarations, when it fact it applied to the following function declarations. https://mta.openssl.org/pipermail/openssl-users/2021-December/014665.html We clarify the wording to make it clear that the warning applies to the following functions. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17180)
87 lines
2.5 KiB
Plaintext
87 lines
2.5 KiB
Plaintext
=pod
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=head1 NAME
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RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL - select RAND method
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=head1 SYNOPSIS
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#include <openssl/rand.h>
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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RAND_METHOD *RAND_OpenSSL(void);
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int RAND_set_rand_method(const RAND_METHOD *meth);
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const RAND_METHOD *RAND_get_rand_method(void);
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=head1 DESCRIPTION
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All of the functions described on this page are deprecated.
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Applications should instead use L<RAND_set_DRBG_type(3)>,
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L<EVP_RAND(3)> and L<EVP_RAND(7)>.
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A B<RAND_METHOD> specifies the functions that OpenSSL uses for random number
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generation.
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RAND_OpenSSL() returns the default B<RAND_METHOD> implementation by OpenSSL.
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This implementation ensures that the PRNG state is unique for each thread.
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If an B<ENGINE> is loaded that provides the RAND API, however, it will
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be used instead of the method returned by RAND_OpenSSL(). This is deprecated
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in OpenSSL 3.0.
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RAND_set_rand_method() makes B<meth> the method for PRNG use. If an
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ENGINE was providing the method, it will be released first.
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RAND_get_rand_method() returns a pointer to the current B<RAND_METHOD>.
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=head1 THE RAND_METHOD STRUCTURE
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typedef struct rand_meth_st {
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int (*seed)(const void *buf, int num);
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int (*bytes)(unsigned char *buf, int num);
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void (*cleanup)(void);
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int (*add)(const void *buf, int num, double entropy);
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int (*pseudorand)(unsigned char *buf, int num);
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int (*status)(void);
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} RAND_METHOD;
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The fields point to functions that are used by, in order,
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RAND_seed(), RAND_bytes(), internal RAND cleanup, RAND_add(), RAND_pseudo_rand()
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and RAND_status().
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Each pointer may be NULL if the function is not implemented.
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=head1 RETURN VALUES
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RAND_set_rand_method() returns 1 on success and 0 on failure.
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RAND_get_rand_method() and RAND_OpenSSL() return pointers to the respective
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methods.
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=head1 SEE ALSO
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L<EVP_RAND(3)>,
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L<RAND_set_DRBG_type(3)>,
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L<RAND_bytes(3)>,
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L<ENGINE_by_id(3)>,
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L<EVP_RAND(7)>,
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L<RAND(7)>
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=head1 HISTORY
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All of these functions were deprecated in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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