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RAND_set_rand_method.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL \- select RAND method .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/rand.h> \& \& RAND_METHOD *RAND_OpenSSL(void); \& \& int RAND_set_rand_method(const RAND_METHOD *meth); \& \& const RAND_METHOD *RAND_get_rand_method(void); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number generation. .PP \&\fBRAND_OpenSSL()\fR returns the default \fB\s-1RAND_METHOD\s0\fR implementation by OpenSSL. This implementation ensures that the \s-1PRNG\s0 state is unique for each thread. .PP If an \fB\s-1ENGINE\s0\fR is loaded that provides the \s-1RAND API,\s0 however, it will be used instead of the method returned by \fBRAND_OpenSSL()\fR. .PP \&\fBRAND_set_rand_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use. If an \&\s-1ENGINE\s0 was providing the method, it will be released first. .PP \&\fBRAND_get_rand_method()\fR returns a pointer to the current \fB\s-1RAND_METHOD\s0\fR. .SH "THE RAND_METHOD STRUCTURE" .IX Header "THE RAND_METHOD STRUCTURE" .Vb 8 \& typedef struct rand_meth_st { \& int (*seed)(const void *buf, int num); \& int (*bytes)(unsigned char *buf, int num); \& void (*cleanup)(void); \& int (*add)(const void *buf, int num, double entropy); \& int (*pseudorand)(unsigned char *buf, int num); \& int (*status)(void); \& } RAND_METHOD; .Ve .PP The fields point to functions that are used by, in order, \&\fBRAND_seed()\fR, \fBRAND_bytes()\fR, internal \s-1RAND\s0 cleanup, \fBRAND_add()\fR, \fBRAND_pseudo_rand()\fR and \fBRAND_status()\fR. Each pointer may be \s-1NULL\s0 if the function is not implemented. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRAND_set_rand_method()\fR returns 1 on success and 0 on failure. \&\fBRAND_get_rand_method()\fR and \fBRAND_OpenSSL()\fR return pointers to the respective methods. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBRAND_bytes\fR\|(3), \&\fBENGINE_by_id\fR\|(3), \&\s-1\fBRAND\s0\fR\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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