mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-02 13:03:28 +01:00
130 lines
4.5 KiB
Plaintext
130 lines
4.5 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
BN_rand_ex, BN_rand, BN_priv_rand_ex, BN_priv_rand, BN_pseudo_rand,
|
|
BN_rand_range_ex, BN_rand_range, BN_priv_rand_range_ex, BN_priv_rand_range,
|
|
BN_pseudo_rand_range
|
|
- generate pseudo-random number
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/bn.h>
|
|
|
|
int BN_rand_ex(BIGNUM *rnd, int bits, int top, int bottom,
|
|
unsigned int strength, BN_CTX *ctx);
|
|
int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
|
|
|
|
int BN_priv_rand_ex(BIGNUM *rnd, int bits, int top, int bottom,
|
|
unsigned int strength, BN_CTX *ctx);
|
|
int BN_priv_rand(BIGNUM *rnd, int bits, int top, int bottom);
|
|
|
|
int BN_rand_range_ex(BIGNUM *rnd, const BIGNUM *range, unsigned int strength,
|
|
BN_CTX *ctx);
|
|
int BN_rand_range(BIGNUM *rnd, const BIGNUM *range);
|
|
|
|
int BN_priv_rand_range_ex(BIGNUM *rnd, const BIGNUM *range, unsigned int strength,
|
|
BN_CTX *ctx);
|
|
int BN_priv_rand_range(BIGNUM *rnd, const BIGNUM *range);
|
|
|
|
The following functions have been deprecated since OpenSSL 3.0, and can be
|
|
hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
|
|
see L<openssl_user_macros(7)>:
|
|
|
|
int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
|
|
int BN_pseudo_rand_range(BIGNUM *rnd, const BIGNUM *range);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
BN_rand_ex() generates a cryptographically strong pseudo-random
|
|
number of I<bits> in length and security strength at least I<strength> bits
|
|
using the random number generator for the library context associated with
|
|
I<ctx>. The function stores the generated data in I<rnd>. The parameter I<ctx>
|
|
may be NULL in which case the default library context is used.
|
|
If I<bits> is less than zero, or too small to
|
|
accommodate the requirements specified by the I<top> and I<bottom>
|
|
parameters, an error is returned.
|
|
The I<top> parameters specifies
|
|
requirements on the most significant bit of the generated number.
|
|
If it is B<BN_RAND_TOP_ANY>, there is no constraint.
|
|
If it is B<BN_RAND_TOP_ONE>, the top bit must be one.
|
|
If it is B<BN_RAND_TOP_TWO>, 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*I<bits> length.
|
|
If I<bottom> is B<BN_RAND_BOTTOM_ODD>, the number will be odd; if it
|
|
is B<BN_RAND_BOTTOM_ANY> it can be odd or even.
|
|
If I<bits> is 1 then I<top> cannot also be B<BN_RAND_TOP_TWO>.
|
|
|
|
BN_rand() is the same as BN_rand_ex() except that the default library context
|
|
is always used.
|
|
|
|
BN_rand_range_ex() generates a cryptographically strong pseudo-random
|
|
number I<rnd>, of security stength at least I<strength> bits,
|
|
in the range 0 E<lt>= I<rnd> E<lt> I<range> using the random number
|
|
generator for the library context associated with I<ctx>. The parameter I<ctx>
|
|
may be NULL in which case the default library context is used.
|
|
|
|
BN_rand_range() is the same as BN_rand_range_ex() except that the default
|
|
library context is always used.
|
|
|
|
BN_priv_rand_ex(), BN_priv_rand(), BN_priv_rand_rand_ex() and
|
|
BN_priv_rand_range() have the same semantics as BN_rand_ex(), BN_rand(),
|
|
BN_rand_range_ex() and BN_rand_range() respectively. They are intended to be
|
|
used for generating values that should remain private, and mirror the
|
|
same difference between L<RAND_bytes(3)> and L<RAND_priv_bytes(3)>.
|
|
|
|
=head1 NOTES
|
|
|
|
Always check the error return value of these functions and do not take
|
|
randomness for granted: an error occurs if the CSPRNG has not been
|
|
seeded with enough randomness to ensure an unpredictable byte sequence.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
The functions return 1 on success, 0 on error.
|
|
The error codes can be obtained by L<ERR_get_error(3)>.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ERR_get_error(3)>,
|
|
L<RAND_add(3)>,
|
|
L<RAND_bytes(3)>,
|
|
L<RAND_priv_bytes(3)>,
|
|
L<RAND(7)>,
|
|
L<EVP_RAND(7)>
|
|
|
|
=head1 HISTORY
|
|
|
|
=over 2
|
|
|
|
=item *
|
|
|
|
Starting with OpenSSL release 1.1.0, BN_pseudo_rand() has been identical
|
|
to BN_rand() and BN_pseudo_rand_range() has been identical to
|
|
BN_rand_range().
|
|
The BN_pseudo_rand() and BN_pseudo_rand_range() functions were
|
|
deprecated in OpenSSL 3.0.
|
|
|
|
=item *
|
|
|
|
The BN_priv_rand() and BN_priv_rand_range() functions were added in
|
|
OpenSSL 1.1.1.
|
|
|
|
=item *
|
|
|
|
The BN_rand_ex(), BN_priv_rand_ex(), BN_rand_range_ex() and
|
|
BN_priv_rand_range_ex() functions were added in OpenSSL 3.0.
|
|
|
|
=back
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|