191 lines
5.8 KiB
Groff
191 lines
5.8 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BN_rand 3"
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.TH BN_rand 3 "2006-07-29" "0.9.8b" "OpenSSL"
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.SH "NAME"
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BN_rand, BN_pseudo_rand \- generate pseudo\-random number
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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/bn.h>
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.Ve
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.PP
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.Vb 1
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\& int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
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.Ve
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.PP
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.Vb 1
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\& int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
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.Ve
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.PP
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.Vb 1
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\& int BN_rand_range(BIGNUM *rnd, BIGNUM *range);
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.Ve
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.PP
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.Vb 1
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\& int BN_pseudo_rand_range(BIGNUM *rnd, BIGNUM *range);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_rand()\fR generates a cryptographically strong pseudo-random number of
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\&\fBbits\fR bits in length and stores it in \fBrnd\fR. If \fBtop\fR is \-1, the
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most significant bit of the random number can be zero. If \fBtop\fR is 0,
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it is set to 1, and if \fBtop\fR is 1, the two most significant bits of
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the number will be set to 1, so that the product of two such random
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numbers will always have 2*\fBbits\fR length. If \fBbottom\fR is true, the
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number will be odd.
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.PP
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\&\fIBN_pseudo_rand()\fR does the same, but pseudo-random numbers generated by
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this function are not necessarily unpredictable. They can be used for
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non-cryptographic purposes and for certain purposes in cryptographic
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protocols, but usually not for key generation etc.
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.PP
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\&\fIBN_rand_range()\fR generates a cryptographically strong pseudo-random
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number \fBrnd\fR in the range 0 <lt>= \fBrnd\fR < \fBrange\fR.
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\&\fIBN_pseudo_rand_range()\fR does the same, but is based on \fIBN_pseudo_rand()\fR,
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and hence numbers generated by it are not necessarily unpredictable.
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.PP
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The \s-1PRNG\s0 must be seeded prior to calling \fIBN_rand()\fR or \fIBN_rand_range()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The functions return 1 on success, 0 on error.
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The error codes can be obtained by \fIERR_get_error\fR\|(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3),
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\&\fIRAND_add\fR\|(3), \fIRAND_bytes\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIBN_rand()\fR is available in all versions of SSLeay and OpenSSL.
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\&\fIBN_pseudo_rand()\fR was added in OpenSSL 0.9.5. The \fBtop\fR == \-1 case
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and the function \fIBN_rand_range()\fR were added in OpenSSL 0.9.6a.
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\&\fIBN_pseudo_rand_range()\fR was added in OpenSSL 0.9.6c.
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