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43 lines
884 B
Groff
43 lines
884 B
Groff
.TH GENRANDOM 3
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.SH NAME
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genrandom, prng \- random number generation
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.SH SYNOPSIS
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.B #include <u.h>
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.br
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.B #include <libc.h>
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.br
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.B #include <mp.h>
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.br
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.B #include <libsec.h>
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.PP
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.B
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void genrandom(uchar *buf, int nbytes)
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.PP
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.B
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void prng(uchar *buf, int nbytes)
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.SH DESCRIPTION
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Most security software requires a source of random or, at the
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very least, unguessable numbers.
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.PP
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.I Genrandom
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fills a buffer with bytes from the X9.17 pseudo-random
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number generator. The X9.17 generator is seeded by 24
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truly random bytes read from
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.BR /dev/random .
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.PP
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.I Prng
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uses the native
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.IR rand (3)
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pseudo-random number generator to fill the buffer. Used with
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.IR srand ,
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this function can produce a reproducible stream of pseudo random
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numbers useful in testing.
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.PP
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Both functions may be passed to
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.I mprand
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(see
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.IR mp (3)).
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.SH SOURCE
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.B /usr/local/plan9/src/libsec
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.SH SEE ALSO
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.IR mp (3)
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