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Edit File : RAND_egd_bytes.3 \| Size : 6.14 KB
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" RAND_egd, RAND_egd_bytes, RAND_query_egd_bytes \- query entropy gathering daemon .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/rand.h> \& \& int RAND_egd_bytes(const char path, int num); \& int RAND_egd(const char path); \& \& int RAND_query_egd_bytes(const char path, unsigned char buf, int num); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" On older platforms without a good source of randomness such as \f(CW\(C`/dev/urandom\(C'\fR, it is possible to query an Entropy Gathering Daemon (\s-1EGD\s0) over a local socket to obtain randomness and seed the OpenSSL \s-1RNG.\s0 The protocol used is defined by the EGDs available at <http://egd.sourceforge.net/> or <http://prngd.sourceforge.net>. .PP \&\fBRAND_egd_bytes()\fR requests \fBnum\fR bytes of randomness from an \s-1EGD\s0 at the specified socket \fBpath\fR, and passes the data it receives into \fBRAND_add()\fR. \&\fBRAND_egd()\fR is equivalent to \fBRAND_egd_bytes()\fR with \fBnum\fR set to 255. .PP \&\fBRAND_query_egd_bytes()\fR requests \fBnum\fR bytes of randomness from an \s-1EGD\s0 at the specified socket \fBpath\fR, where \fBnum\fR must be less than 256. If \fBbuf\fR is \fB\s-1NULL\s0\fR, it is equivalent to \fBRAND_egd_bytes()\fR. If \fBbuf\fR is not \fB\s-1NULL\s0\fR, then the data is copied to the buffer and \&\fBRAND_add()\fR is not called. .PP OpenSSL can be configured at build time to try to use the \s-1EGD\s0 for seeding automatically. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBRAND_egd()\fR and \fBRAND_egd_bytes()\fR return the number of bytes read from the daemon on success, or \-1 if the connection failed or the daemon did not return enough data to fully seed the \s-1PRNG.\s0 .PP \&\fBRAND_query_egd_bytes()\fR returns the number of bytes read from the daemon on success, or \-1 if the connection failed. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBRAND_add\fR\\|(3), \&\fBRAND_bytes\fR\\|(3), \&\s-1\fBRAND\s0\fR\\|(7) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

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.\" ========================================================================
.\"
.IX Title "RAND_EGD 3"
.TH RAND_EGD 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
RAND_egd, RAND_egd_bytes, RAND_query_egd_bytes \- query entropy gathering daemon
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/rand.h>
\&
\& int RAND_egd_bytes(const char *path, int num);
\& int RAND_egd(const char *path);
\&
\& int RAND_query_egd_bytes(const char *path, unsigned char *buf, int num);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
On older platforms without a good source of randomness such as \f(CW\*(C`/dev/urandom\*(C'\fR,
it is possible to query an Entropy Gathering Daemon (\s-1EGD\s0) over a local
socket to obtain randomness and seed the OpenSSL \s-1RNG.\s0
The protocol used is defined by the EGDs available at
<http://egd.sourceforge.net/> or <http://prngd.sourceforge.net>.
.PP
\&\fBRAND_egd_bytes()\fR requests \fBnum\fR bytes of randomness from an \s-1EGD\s0 at the
specified socket \fBpath\fR, and passes the data it receives into \fBRAND_add()\fR.
\&\fBRAND_egd()\fR is equivalent to \fBRAND_egd_bytes()\fR with \fBnum\fR set to 255.
.PP
\&\fBRAND_query_egd_bytes()\fR requests \fBnum\fR bytes of randomness from an \s-1EGD\s0 at
the specified socket \fBpath\fR, where \fBnum\fR must be less than 256.
If \fBbuf\fR is \fB\s-1NULL\s0\fR, it is equivalent to \fBRAND_egd_bytes()\fR.
If \fBbuf\fR is not \fB\s-1NULL\s0\fR, then the data is copied to the buffer and
\&\fBRAND_add()\fR is not called.
.PP
OpenSSL can be configured at build time to try to use the \s-1EGD\s0 for seeding
automatically.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBRAND_egd()\fR and \fBRAND_egd_bytes()\fR return the number of bytes read from the
daemon on success, or \-1 if the connection failed or the daemon did not
return enough data to fully seed the \s-1PRNG.\s0
.PP
\&\fBRAND_query_egd_bytes()\fR returns the number of bytes read from the daemon on
success, or \-1 if the connection failed.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBRAND_add\fR\|(3),
\&\fBRAND_bytes\fR\|(3),
\&\s-1\fBRAND\s0\fR\|(7)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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