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BN_rand_range.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_rand, BN_priv_rand, BN_pseudo_rand, BN_rand_range, BN_priv_rand_range, BN_pseudo_rand_range \&\- generate pseudo\-random number .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& int BN_rand(BIGNUM *rnd, int bits, int top, int bottom); \& \& int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom); \& \& int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom); \& \& int BN_rand_range(BIGNUM *rnd, BIGNUM *range); \& \& int BN_priv_rand_range(BIGNUM *rnd, BIGNUM *range); \& \& int BN_pseudo_rand_range(BIGNUM *rnd, BIGNUM *range); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_rand()\fR generates a cryptographically strong pseudo-random number of \&\fBbits\fR in length and stores it in \fBrnd\fR. If \fBbits\fR is less than zero, or too small to accommodate the requirements specified by the \fBtop\fR and \fBbottom\fR parameters, an error is returned. The \fBtop\fR parameters specifies requirements on the most significant bit of the generated number. If it is \fB\s-1BN_RAND_TOP_ANY\s0\fR, there is no constraint. If it is \fB\s-1BN_RAND_TOP_ONE\s0\fR, the top bit must be one. If it is \fB\s-1BN_RAND_TOP_TWO\s0\fR, the two most significant bits of the number will be set to 1, so that the product of two such random numbers will always have 2*\fBbits\fR length. If \fBbottom\fR is \fB\s-1BN_RAND_BOTTOM_ODD\s0\fR, the number will be odd; if it is \fB\s-1BN_RAND_BOTTOM_ANY\s0\fR it can be odd or even. If \fBbits\fR is 1 then \fBtop\fR cannot also be \fB\s-1BN_RAND_TOP_TWO\s0\fR. .PP \&\fBBN_rand_range()\fR generates a cryptographically strong pseudo-random number \fBrnd\fR in the range 0 <= \fBrnd\fR < \fBrange\fR. .PP \&\fBBN_priv_rand()\fR and \fBBN_priv_rand_range()\fR have the same semantics as \&\fBBN_rand()\fR and \fBBN_rand_range()\fR respectively. They are intended to be used for generating values that should remain private, and mirror the same difference between \fBRAND_bytes\fR\|(3) and \fBRAND_priv_bytes\fR\|(3). .SH "NOTES" .IX Header "NOTES" Always check the error return value of these functions and do not take randomness for granted: an error occurs if the \s-1CSPRNG\s0 has not been seeded with enough randomness to ensure an unpredictable byte sequence. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The functions return 1 on success, 0 on error. The error codes can be obtained by \fBERR_get_error\fR\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\|(3), \&\fBRAND_add\fR\|(3), \&\fBRAND_bytes\fR\|(3), \&\fBRAND_priv_bytes\fR\|(3), \&\s-1\fBRAND\s0\fR\|(7), \&\s-1\fBRAND_DRBG\s0\fR\|(7) .SH "HISTORY" .IX Header "HISTORY" .IP "\(bu" 2 Starting with OpenSSL release 1.1.0, \fBBN_pseudo_rand()\fR has been identical to \fBBN_rand()\fR and \fBBN_pseudo_rand_range()\fR has been identical to \&\fBBN_rand_range()\fR. The \*(L"pseudo\*(R" functions should not be used and may be deprecated in a future release. .IP "\(bu" 2 The \&\fBBN_priv_rand()\fR and \fBBN_priv_rand_range()\fR functions were added in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2021 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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