218 lines
7.4 KiB
Groff
Executable File
218 lines
7.4 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "RAND_DRBG_GET0_MASTER 3"
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.TH RAND_DRBG_GET0_MASTER 3 "2020-03-02" "3.0.0-dev" "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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OPENSSL_CTX_get0_master_drbg,
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OPENSSL_CTX_get0_public_drbg,
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OPENSSL_CTX_get0_private_drbg,
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RAND_DRBG_get0_master,
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RAND_DRBG_get0_public,
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RAND_DRBG_get0_private
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\&\- get access to the global RAND_DRBG instances
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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/rand_drbg.h>
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\&
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\& RAND_DRBG *OPENSSL_CTX_get0_master_drbg(OPENSSL_CTX *ctx);
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\& RAND_DRBG *OPENSSL_CTX_get0_public_drbg(OPENSSL_CTX *ctx);
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\& RAND_DRBG *OPENSSL_CTX_get0_private_drbg(OPENSSL_CTX *ctx);
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\& RAND_DRBG *RAND_DRBG_get0_master(void);
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\& RAND_DRBG *RAND_DRBG_get0_public(void);
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\& RAND_DRBG *RAND_DRBG_get0_private(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The default \s-1RAND\s0 \s-1API\s0 implementation (\fIRAND_OpenSSL()\fR) utilizes three
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shared \s-1DRBG\s0 instances which are accessed via the \s-1RAND\s0 \s-1API:\s0
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.PP
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The \fIpublic\fR and \fIprivate\fR \s-1DRBG\s0 are thread-local instances, which are used
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by \fIRAND_bytes()\fR and \fIRAND_priv_bytes()\fR, respectively.
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The \fImaster\fR \s-1DRBG\s0 is a global instance, which is not intended to be used
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directly, but is used internally to reseed the other two instances.
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.PP
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These functions here provide access to the shared \s-1DRBG\s0 instances.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIOPENSSL_CTX_get0_master_drbg()\fR returns a pointer to the \fImaster\fR \s-1DRBG\s0 instance
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for the given \s-1OPENSSL_CTX\s0 \fBctx\fR.
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.PP
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\&\fIOPENSSL_CTX_get0_public_drbg()\fR returns a pointer to the \fIpublic\fR \s-1DRBG\s0 instance
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for the given \s-1OPENSSL_CTX\s0 \fBctx\fR.
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.PP
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\&\fIOPENSSL_CTX_get0_private_drbg()\fR returns a pointer to the \fIprivate\fR \s-1DRBG\s0 instance
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for the given \s-1OPENSSL_CTX\s0 \fBctx\fR.
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.PP
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In all the above cases the \fBctx\fR parameter can
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be \s-1NULL\s0 in which case the default \s-1OPENSSL_CTX\s0 is used. \fIRAND_DRBG_get0_master()\fR,
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\&\fIRAND_DRBG_get0_public()\fR and \fIRAND_DRBG_get0_private()\fR are the same as
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\&\fIOPENSSL_CTX_get0_master_drbg()\fR, \fIOPENSSL_CTX_get0_public_drbg()\fR and
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\&\fIOPENSSL_CTX_get0_private_drbg()\fR respectively except that the default \s-1OPENSSL_CTX\s0
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is always used.
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.SH "NOTES"
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.IX Header "NOTES"
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It is not thread-safe to access the \fImaster\fR \s-1DRBG\s0 instance.
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The \fIpublic\fR and \fIprivate\fR \s-1DRBG\s0 instance can be accessed safely, because
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they are thread-local. Note however, that changes to these two instances
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apply only to the current thread.
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.PP
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For that reason it is recommended not to change the settings of these
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three instances directly.
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Instead, an application should change the default settings for new \s-1DRBG\s0 instances
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at initialization time, before creating additional threads.
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.PP
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During initialization, it is possible to change the reseed interval
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and reseed time interval.
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It is also possible to exchange the reseeding callbacks entirely.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIRAND_DRBG_set_callbacks\fR\|(3),
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\&\fIRAND_DRBG_set_reseed_defaults\fR\|(3),
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\&\fIRAND_DRBG_set_reseed_interval\fR\|(3),
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\&\fIRAND_DRBG_set_reseed_time_interval\fR\|(3),
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\&\fIRAND_DRBG_set_callbacks\fR\|(3),
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\&\fIRAND_DRBG_generate\fR\|(3),
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\&\s-1\fIRAND_DRBG\s0\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fIOPENSSL_CTX_get0_master_drbg()\fR, \fIOPENSSL_CTX_get0_public_drbg()\fR and
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\&\fIOPENSSL_CTX_get0_private_drbg()\fR functions were added in OpenSSL 3.0.
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.PP
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All other \s-1RAND_DRBG\s0 functions were added in OpenSSL 1.1.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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