218 lines
7.2 KiB
Groff
218 lines
7.2 KiB
Groff
.\" $NetBSD: RAND_set_rand_method.3,v 1.20 2007/11/27 22:19:28 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "RAND_set_rand_method 3"
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.TH RAND_set_rand_method 3 "2003-07-24" "0.9.8e" "OpenSSL"
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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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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/rand.h>
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.Ve
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.PP
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.Vb 1
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\& void RAND_set_rand_method(const RAND_METHOD *meth);
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.Ve
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.PP
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.Vb 1
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\& const RAND_METHOD *RAND_get_rand_method(void);
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.Ve
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.PP
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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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.IX Header "DESCRIPTION"
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A \fB\s-1RAND_METHOD\s0\fR specifies the functions that OpenSSL uses for random number
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generation. By modifying the method, alternative implementations such as
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hardware RNGs may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for important
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information about how these \s-1RAND\s0 \s-1API\s0 functions are affected by the use of
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\&\fB\s-1ENGINE\s0\fR \s-1API\s0 calls.
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.PP
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Initially, the default \s-1RAND_METHOD\s0 is the OpenSSL internal implementation, as
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returned by \fIRAND_SSLeay()\fR.
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.PP
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\&\fIRAND_set_default_method()\fR makes \fBmeth\fR the method for \s-1PRNG\s0 use. \fB\s-1NB\s0\fR: This is
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true only whilst no \s-1ENGINE\s0 has been set as a default for \s-1RAND\s0, so this function
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is no longer recommended.
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.PP
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\&\fIRAND_get_default_method()\fR returns a pointer to the current \s-1RAND_METHOD\s0.
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However, the meaningfulness of this result is dependant on whether the \s-1ENGINE\s0
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\&\s-1API\s0 is being used, so this function is no longer recommended.
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.SH "THE RAND_METHOD STRUCTURE"
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.IX Header "THE RAND_METHOD STRUCTURE"
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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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.PP
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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 \s-1NULL\s0 if the function is not implemented.
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.SH "RETURN VALUES"
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.IX Header "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 "NOTES"
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.IX Header "NOTES"
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As of version 0.9.7, \s-1RAND_METHOD\s0 implementations are grouped together with other
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algorithmic APIs (eg. \s-1RSA_METHOD\s0, \s-1EVP_CIPHER\s0, etc) in \fB\s-1ENGINE\s0\fR modules. If a
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default \s-1ENGINE\s0 is specified for \s-1RAND\s0 functionality using an \s-1ENGINE\s0 \s-1API\s0 function,
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that will override any \s-1RAND\s0 defaults set using the \s-1RAND\s0 \s-1API\s0 (ie.
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\&\fIRAND_set_rand_method()\fR). For this reason, the \s-1ENGINE\s0 \s-1API\s0 is the recommended way
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to control default implementations for use in \s-1RAND\s0 and other cryptographic
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algorithms.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIopenssl_rand\fR\|(3), \fIengine\fR\|(3)
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.SH "HISTORY"
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.IX Header "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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.PP
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In the engine version of version 0.9.6, \fIRAND_set_rand_method()\fR was altered to
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take an \s-1ENGINE\s0 pointer as its argument. As of version 0.9.7, that has been
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reverted as the \s-1ENGINE\s0 \s-1API\s0 transparently overrides \s-1RAND\s0 defaults if used,
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otherwise \s-1RAND\s0 \s-1API\s0 functions work as before. \fIRAND_set_rand_engine()\fR was also
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introduced in version 0.9.7.
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