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+.\" ======================================================================
+.\"
+.IX Title "RAND_SET_RAND_METHOD 1"
+.TH RAND_SET_RAND_METHOD 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay \- select \s-1RAND\s0 method
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/rand.h>
+.Ve
+.Vb 1
+\& void RAND_set_rand_method(RAND_METHOD *meth);
+.Ve
+.Vb 1
+\& RAND_METHOD *RAND_get_rand_method(void);
+.Ve
+.Vb 1
+\& RAND_METHOD *RAND_SSLeay(void);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random
+number generation. By modifying the method, alternative
+implementations such as hardware RNGs may be used.  Initially, the
+default is to use the OpenSSL internal implementation. \fIRAND_SSLeay()\fR
+returns a pointer to that method.
+.PP
+\&\fIRAND_set_rand_method()\fR sets the \s-1RAND\s0 method to \fBmeth\fR.
+\&\fIRAND_get_rand_method()\fR returns a pointer to the current method.
+.SH "THE RAND_METHOD STRUCTURE"
+.IX Header "THE RAND_METHOD STRUCTURE"
+.Vb 9
+\& typedef struct rand_meth_st
+\& {
+\&        void (*seed)(const void *buf, int num);
+\&        int (*bytes)(unsigned char *buf, int num);
+\&        void (*cleanup)(void);
+\&        void (*add)(const void *buf, int num, int entropy);
+\&        int (*pseudorand)(unsigned char *buf, int num);
+\&        int (*status)(void);
+\& } RAND_METHOD;
+.Ve
+The components point to the implementation of \fIRAND_seed()\fR,
+\&\fIRAND_bytes()\fR, \fIRAND_cleanup()\fR, \fIRAND_add()\fR, \fIRAND_pseudo_rand()\fR
+and \fIRAND_status()\fR.
+Each component may be \s-1NULL\s0 if the function is not implemented.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIRAND_set_rand_method()\fR returns no value. \fIRAND_get_rand_method()\fR and
+\&\fIRAND_SSLeay()\fR return pointers to the respective methods.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+rand(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIRAND_set_rand_method()\fR, \fIRAND_get_rand_method()\fR and \fIRAND_SSLeay()\fR are
+available in all versions of OpenSSL.