185 lines
5.9 KiB
Groff
Executable File
185 lines
5.9 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "RAND_EGD 3"
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.TH RAND_EGD 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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RAND_egd, RAND_egd_bytes, RAND_query_egd_bytes \- query entropy gathering daemon
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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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\&
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\& int RAND_egd_bytes(const char *path, int num);
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\& int RAND_egd(const char *path);
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\&
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\& int RAND_query_egd_bytes(const char *path, unsigned char *buf, int num);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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On older platforms without a good source of randomness such as \f(CW\*(C`/dev/urandom\*(C'\fR,
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it is possible to query an Entropy Gathering Daemon (\s-1EGD\s0) over a local
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socket to obtain randomness and seed the OpenSSL \s-1RNG\s0.
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The protocol used is defined by the EGDs available at
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<http://egd.sourceforge.net/> or <http://prngd.sourceforge.net>.
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.PP
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\&\fIRAND_egd_bytes()\fR requests \fBnum\fR bytes of randomness from an \s-1EGD\s0 at the
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specified socket \fBpath\fR, and passes the data it receives into \fIRAND_add()\fR.
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\&\fIRAND_egd()\fR is equivalent to \fIRAND_egd_bytes()\fR with \fBnum\fR set to 255.
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.PP
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\&\fIRAND_query_egd_bytes()\fR requests \fBnum\fR bytes of randomness from an \s-1EGD\s0 at
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the specified socket \fBpath\fR, where \fBnum\fR must be less than 256.
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If \fBbuf\fR is \fB\s-1NULL\s0\fR, it is equivalent to \fIRAND_egd_bytes()\fR.
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If \fBbuf\fR is not \fB\s-1NULL\s0\fR, then the data is copied to the buffer and
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\&\fIRAND_add()\fR is not called.
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.PP
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OpenSSL can be configured at build time to try to use the \s-1EGD\s0 for seeding
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automatically.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIRAND_egd()\fR and \fIRAND_egd_bytes()\fR return the number of bytes read from the
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daemon on success, or \-1 if the connection failed or the daemon did not
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return enough data to fully seed the \s-1PRNG\s0.
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.PP
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\&\fIRAND_query_egd_bytes()\fR returns the number of bytes read from the daemon on
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success, or \-1 if the connection failed.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIRAND_add\fR\|(3),
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\&\fIRAND_bytes\fR\|(3),
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\&\s-1\fIRAND\s0\fR\|(7)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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