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131 .IX Title "RAND_SET_RAND_METHOD 3"
132 .TH RAND_SET_RAND_METHOD 3 "2018-09-11" "1.1.1" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 RAND_set_rand_method, RAND_get_rand_method, RAND_OpenSSL \- select RAND method
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/rand.h>
144 \& RAND_METHOD *RAND_OpenSSL(void);
146 \& void RAND_set_rand_method(const RAND_METHOD *meth);
148 \& const RAND_METHOD *RAND_get_rand_method(void);
151 .IX Header "DESCRIPTION"
152 A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number
155 \&\fIRAND_OpenSSL()\fR returns the default \fB\s-1RAND_METHOD\s0\fR implementation by OpenSSL.
156 This implementation ensures that the \s-1PRNG\s0 state is unique for each thread.
158 If an \fB\s-1ENGINE\s0\fR is loaded that provides the \s-1RAND API,\s0 however, it will
159 be used instead of the method returned by \fIRAND_OpenSSL()\fR.
161 \&\fIRAND_set_rand_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use. If an
162 \&\s-1ENGINE\s0 was providing the method, it will be released first.
164 \&\fIRAND_get_rand_method()\fR returns a pointer to the current \fB\s-1RAND_METHOD\s0\fR.
165 .SH "THE RAND_METHOD STRUCTURE"
166 .IX Header "THE RAND_METHOD STRUCTURE"
168 \& typedef struct rand_meth_st {
169 \& void (*seed)(const void *buf, int num);
170 \& int (*bytes)(unsigned char *buf, int num);
171 \& void (*cleanup)(void);
172 \& void (*add)(const void *buf, int num, int randomness);
173 \& int (*pseudorand)(unsigned char *buf, int num);
174 \& int (*status)(void);
178 The fields point to functions that are used by, in order,
179 \&\fIRAND_seed()\fR, \fIRAND_bytes()\fR, internal \s-1RAND\s0 cleanup, \fIRAND_add()\fR, \fIRAND_pseudo_rand()\fR
180 and \fIRAND_status()\fR.
181 Each pointer may be \s-1NULL\s0 if the function is not implemented.
183 .IX Header "RETURN VALUES"
184 \&\fIRAND_set_rand_method()\fR returns no value. \fIRAND_get_rand_method()\fR and
185 \&\fIRAND_OpenSSL()\fR return pointers to the respective methods.
187 .IX Header "SEE ALSO"
188 \&\fIRAND_bytes\fR\|(3),
189 \&\fIENGINE_by_id\fR\|(3),
190 \&\s-1\fIRAND\s0\fR\|(7)
192 .IX Header "COPYRIGHT"
193 Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
195 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
196 this file except in compliance with the License. You can obtain a copy
197 in the file \s-1LICENSE\s0 in the source distribution or at
198 <https://www.openssl.org/source/license.html>.