195 lines
6.1 KiB
Groff
Executable File
195 lines
6.1 KiB
Groff
Executable File
.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16)
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.rm #[ #] #H #V #F C
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.\" ========================================================================
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.\"
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.IX Title "RAND_SET_RAND_METHOD 3"
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.TH RAND_SET_RAND_METHOD 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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RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL \- select RAND method
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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.h>
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\&
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\& RAND_METHOD *RAND_OpenSSL(void);
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\&
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\& int RAND_set_rand_method(const RAND_METHOD *meth);
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\&
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\& const RAND_METHOD *RAND_get_rand_method(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number
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generation.
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.PP
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\&\fIRAND_OpenSSL()\fR returns the default \fB\s-1RAND_METHOD\s0\fR implementation by OpenSSL.
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This implementation ensures that the \s-1PRNG\s0 state is unique for each thread.
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.PP
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If an \fB\s-1ENGINE\s0\fR is loaded that provides the \s-1RAND\s0 \s-1API\s0, however, it will
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be used instead of the method returned by \fIRAND_OpenSSL()\fR.
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.PP
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\&\fIRAND_set_rand_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use. If an
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\&\s-1ENGINE\s0 was providing the method, it will be released first.
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.PP
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\&\fIRAND_get_rand_method()\fR returns a pointer to the current \fB\s-1RAND_METHOD\s0\fR.
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.SH "THE RAND_METHOD STRUCTURE"
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.IX Header "THE RAND_METHOD STRUCTURE"
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.Vb 8
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\& typedef struct rand_meth_st {
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\& void (*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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\& void (*add)(const void *buf, int num, int randomness);
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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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.Ve
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.PP
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The fields point to functions that are used by, in order,
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\&\fIRAND_seed()\fR, \fIRAND_bytes()\fR, internal \s-1RAND\s0 cleanup, \fIRAND_add()\fR, \fIRAND_pseudo_rand()\fR
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and \fIRAND_status()\fR.
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Each pointer may be \s-1NULL\s0 if the function is not implemented.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRAND_set_rand_method()\fR returns 1 on success and 0 on failure.
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\&\fIRAND_get_rand_method()\fR and \fIRAND_OpenSSL()\fR return pointers to the respective
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methods.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIRAND_bytes\fR\|(3),
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\&\fIENGINE_by_id\fR\|(3),
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\&\s-1\fIRAND\s0\fR\|(7)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 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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