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135 .IX Title "RAND_SET_RAND_METHOD 3"
136 .TH RAND_SET_RAND_METHOD 3 "2020-03-31" "1.1.1f" "OpenSSL"
137 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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142 RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL \- select RAND method
144 .IX Header "SYNOPSIS"
146 \& #include <openssl/rand.h>
148 \& RAND_METHOD *RAND_OpenSSL(void);
150 \& int RAND_set_rand_method(const RAND_METHOD *meth);
152 \& const RAND_METHOD *RAND_get_rand_method(void);
155 .IX Header "DESCRIPTION"
156 A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number
159 \&\fBRAND_OpenSSL()\fR returns the default \fB\s-1RAND_METHOD\s0\fR implementation by OpenSSL.
160 This implementation ensures that the \s-1PRNG\s0 state is unique for each thread.
162 If an \fB\s-1ENGINE\s0\fR is loaded that provides the \s-1RAND API,\s0 however, it will
163 be used instead of the method returned by \fBRAND_OpenSSL()\fR.
165 \&\fBRAND_set_rand_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use. If an
166 \&\s-1ENGINE\s0 was providing the method, it will be released first.
168 \&\fBRAND_get_rand_method()\fR returns a pointer to the current \fB\s-1RAND_METHOD\s0\fR.
169 .SH "THE RAND_METHOD STRUCTURE"
170 .IX Header "THE RAND_METHOD STRUCTURE"
172 \& typedef struct rand_meth_st {
173 \& void (*seed)(const void *buf, int num);
174 \& int (*bytes)(unsigned char *buf, int num);
175 \& void (*cleanup)(void);
176 \& void (*add)(const void *buf, int num, int randomness);
177 \& int (*pseudorand)(unsigned char *buf, int num);
178 \& int (*status)(void);
182 The fields point to functions that are used by, in order,
183 \&\fBRAND_seed()\fR, \fBRAND_bytes()\fR, internal \s-1RAND\s0 cleanup, \fBRAND_add()\fR, \fBRAND_pseudo_rand()\fR
184 and \fBRAND_status()\fR.
185 Each pointer may be \s-1NULL\s0 if the function is not implemented.
187 .IX Header "RETURN VALUES"
188 \&\fBRAND_set_rand_method()\fR returns 1 on success and 0 on failure.
189 \&\fBRAND_get_rand_method()\fR and \fBRAND_OpenSSL()\fR return pointers to the respective
192 .IX Header "SEE ALSO"
193 \&\fBRAND_bytes\fR\|(3),
194 \&\fBENGINE_by_id\fR\|(3),
195 \&\s-1\fBRAND\s0\fR\|(7)
197 .IX Header "COPYRIGHT"
198 Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
200 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
201 this file except in compliance with the License. You can obtain a copy
202 in the file \s-1LICENSE\s0 in the source distribution or at
203 <https://www.openssl.org/source/license.html>.