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While stereotyped repetitions are frowned upon in literature, they serve a useful purpose in manual pages, because it is easier for the user to find certain information if it is always presented in the same way. For that reason, this commit harmonizes the varying formulations in the HISTORY section about which functions, flags, etc. were added in which OpenSSL version. It also attempts to make the pod files more grep friendly by avoiding to insert line breaks between the symbol names and the corresponding version number in which they were introduced (wherever possible). Some punctuation and typographical errors were fixed on the way. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7854)
100 lines
2.9 KiB
Plaintext
100 lines
2.9 KiB
Plaintext
=pod
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=head1 NAME
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BN_rand, BN_priv_rand, BN_pseudo_rand,
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BN_rand_range, BN_priv_rand_range, BN_pseudo_rand_range
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- generate pseudo-random number
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
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int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom);
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int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
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int BN_rand_range(BIGNUM *rnd, BIGNUM *range);
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int BN_priv_rand_range(BIGNUM *rnd, BIGNUM *range);
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int BN_pseudo_rand_range(BIGNUM *rnd, BIGNUM *range);
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=head1 DESCRIPTION
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BN_rand() generates a cryptographically strong pseudo-random number of
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B<bits> in length and stores it in B<rnd>.
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If B<bits> is less than zero, or too small to
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accommodate the requirements specified by the B<top> and B<bottom>
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parameters, an error is returned.
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The B<top> parameters specifies
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requirements on the most significant bit of the generated number.
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If it is B<BN_RAND_TOP_ANY>, there is no constraint.
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If it is B<BN_RAND_TOP_ONE>, the top bit must be one.
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If it is B<BN_RAND_TOP_TWO>, 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*B<bits> length.
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If B<bottom> is B<BN_RAND_BOTTOM_ODD>, the number will be odd; if it
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is B<BN_RAND_BOTTOM_ANY> it can be odd or even.
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If B<bits> is 1 then B<top> cannot also be B<BN_RAND_FLG_TOPTWO>.
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BN_rand_range() generates a cryptographically strong pseudo-random
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number B<rnd> in the range 0 E<lt>= B<rnd> E<lt> B<range>.
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BN_priv_rand() and BN_priv_rand_range() have the same semantics as
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BN_rand() and BN_rand_range() respectively. They are intended to be
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used for generating values that should remain private, and mirror the
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same difference between L<RAND_bytes(3)> and L<RAND_priv_bytes(3)>.
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=head1 NOTES
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Always check the error return value of these functions and do not take
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randomness for granted: an error occurs if the CSPRNG has not been
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seeded with enough randomness to ensure an unpredictable byte sequence.
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=head1 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 L<ERR_get_error(3)>.
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=head1 HISTORY
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=over 2
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=item *
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Starting with OpenSSL release 1.1.0, BN_pseudo_rand() has been identical
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to BN_rand() and BN_pseudo_rand_range() has been identical to
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BN_rand_range().
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The "pseudo" functions should not be used and may be deprecated in
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a future release.
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=item *
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The
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BN_priv_rand() and BN_priv_rand_range() functions were added in OpenSSL 1.1.1.
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=back
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=head1 SEE ALSO
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L<ERR_get_error(3)>,
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L<RAND_add(3)>,
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L<RAND_bytes(3)>,
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L<RAND_priv_bytes(3)>,
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L<RAND(7)>,
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L<RAND_DRBG(7)>
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=head1 COPYRIGHT
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Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). 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 LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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