mirror of
https://github.com/9fans/plan9port.git
synced 2025-01-12 11:10:07 +00:00
45 lines
876 B
Groff
45 lines
876 B
Groff
|
.TH GENRANDOM 3
|
||
|
|
.SH NAME
|
||
|
|
genrandom, prng \- random number generation
|
||
|
|
.SH SYNOPSIS
|
||
|
|
.B #include <u.h>
|
||
|
|
.br
|
||
|
|
.B #include <libc.h>
|
||
|
|
.br
|
||
|
|
.B #include <mp.h>
|
||
|
|
.br
|
||
|
|
.B #include <libsec.h>
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
void genrandom(uchar *buf, int nbytes)
|
||
|
|
.PP
|
||
|
|
.B
|
||
|
|
void prng(uchar *buf, int nbytes)
|
||
|
|
.SH DESCRIPTION
|
||
|
|
.PP
|
||
|
|
Most security software requires a source of random or, at the
|
||
|
|
very least, unguessable numbers.
|
||
|
|
.PP
|
||
|
|
.I Genrandom
|
||
|
|
fills a buffer with bytes from the X9.17 pseudo-random
|
||
|
|
number generator. The X9.17 generator is seeded by 24
|
||
|
|
truly random bytes read from
|
||
|
|
.BR /dev/random .
|
||
|
|
.PP
|
||
|
|
.I Prng
|
||
|
|
uses the native
|
||
|
|
.IR rand (2)
|
||
|
|
pseudo-random number generator to fill the buffer. Used with
|
||
|
|
.IR srand ,
|
||
|
|
this function can produce a reproducible stream of pseudo random
|
||
|
|
numbers useful in testing.
|
||
|
|
.PP
|
||
|
|
Both functions may be passed to
|
||
|
|
.I mprand
|
||
|
|
(see
|
||
|
|
.IR mp (2)).
|
||
|
|
.SH SOURCE
|
||
|
|
.B /sys/src/libsec
|
||
|
|
.SH SEE ALSO
|
||
|
|
.IR mp (2)
|