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140 .IX Title "RAND_set_rand_method 3"
141 .TH RAND_set_rand_method 3 "0.9.6e" "2000-04-13" "OpenSSL"
144 RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay \- select \s-1RAND\s0 method
146 .IX Header "SYNOPSIS"
148 \& #include <openssl/rand.h>
151 \& void RAND_set_rand_method(RAND_METHOD *meth);
154 \& RAND_METHOD *RAND_get_rand_method(void);
157 \& RAND_METHOD *RAND_SSLeay(void);
160 .IX Header "DESCRIPTION"
161 A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random
162 number generation. By modifying the method, alternative
163 implementations such as hardware RNGs may be used. Initially, the
164 default is to use the OpenSSL internal implementation. \fIRAND_SSLeay()\fR
165 returns a pointer to that method.
167 \&\fIRAND_set_rand_method()\fR sets the \s-1RAND\s0 method to \fBmeth\fR.
168 \&\fIRAND_get_rand_method()\fR returns a pointer to the current method.
169 .SH "THE RAND_METHOD STRUCTURE"
170 .IX Header "THE RAND_METHOD STRUCTURE"
172 \& typedef struct rand_meth_st
174 \& void (*seed)(const void *buf, int num);
175 \& int (*bytes)(unsigned char *buf, int num);
176 \& void (*cleanup)(void);
177 \& void (*add)(const void *buf, int num, int entropy);
178 \& int (*pseudorand)(unsigned char *buf, int num);
179 \& int (*status)(void);
182 The components point to the implementation of \fIRAND_seed()\fR,
183 \&\fIRAND_bytes()\fR, \fIRAND_cleanup()\fR, \fIRAND_add()\fR, \fIRAND_pseudo_rand()\fR
184 and \fIRAND_status()\fR.
185 Each component may be \s-1NULL\s0 if the function is not implemented.
187 .IX Header "RETURN VALUES"
188 \&\fIRAND_set_rand_method()\fR returns no value. \fIRAND_get_rand_method()\fR and
189 \&\fIRAND_SSLeay()\fR return pointers to the respective methods.
191 .IX Header "SEE ALSO"
195 \&\fIRAND_set_rand_method()\fR, \fIRAND_get_rand_method()\fR and \fIRAND_SSLeay()\fR are
196 available in all versions of OpenSSL.