259 lines
6.0 KiB
Groff
259 lines
6.0 KiB
Groff
.rn '' }`
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' Bell System Logo is used as a dummy character.
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\}
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.TH RAND_set_rand_method 3 "0.9.5a" "22/Jul/2000" "OpenSSL"
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.UC
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.if n .hy 0
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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\{\
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay \- select RAND method
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/rand.h>
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.Ve
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.Vb 1
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\& void RAND_set_rand_method(RAND_METHOD *meth);
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.Ve
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.Vb 1
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\& RAND_METHOD *RAND_get_rand_method(void);
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.Ve
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.Vb 1
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\& RAND_METHOD *RAND_SSLeay(void);
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.Ve
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.SH "DESCRIPTION"
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A \fBRAND_METHOD\fR specifies the functions that OpenSSL uses for random
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number generation. By modifying the method, alternative
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implementations such as hardware RNGs may be used. Initially, the
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default is to use the OpenSSL internal implementation. \fIRAND_SSLeay()\fR
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returns a pointer to that method.
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.PP
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\fIRAND_set_rand_method()\fR sets the RAND method to \fBmeth\fR.
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\fIRAND_get_rand_method()\fR returns a pointer to the current method.
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.SH "THE RAND_METHOD STRUCTURE"
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.PP
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.Vb 9
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\& typedef struct rand_meth_st
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\& {
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\& void (*seed)(const void *buf, int num);
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\& int (*bytes)(unsigned char *buf, int num);
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\& void (*cleanup)(void);
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\& void (*add)(const void *buf, int num, int entropy);
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\& int (*pseudorand)(unsigned char *buf, int num);
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\& int (*status)(void);
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\& } RAND_METHOD;
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.Ve
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The components point to the implementation of \fIRAND_seed()\fR,
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\fIRAND_bytes()\fR, \fIRAND_cleanup()\fR, \fIRAND_add()\fR, \fIRAND_pseudo_rand()\fR
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and \fIRAND_status()\fR.
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Each component may be NULL if the function is not implemented.
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.SH "RETURN VALUES"
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\fIRAND_set_rand_method()\fR returns no value. \fIRAND_get_rand_method()\fR and
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\fIRAND_SSLeay()\fR return pointers to the respective methods.
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.SH "SEE ALSO"
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the \fIrand(3)|rand(3)\fR manpage
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.SH "HISTORY"
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\fIRAND_set_rand_method()\fR, \fIRAND_get_rand_method()\fR and \fIRAND_SSLeay()\fR are
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available in all versions of OpenSSL.
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.rn }` ''
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.IX Title "RAND_set_rand_method 3"
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.IX Name "RAND_set_rand_method, RAND_get_rand_method, RAND_SSLeay - select RAND method"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "THE RAND_METHOD STRUCTURE"
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.IX Header "RETURN VALUES"
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.IX Header "SEE ALSO"
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.IX Header "HISTORY"
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