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BN_set_bit.pod
=pod =head1 NAME BN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits, BN_lshift, BN_lshift1, BN_rshift, BN_rshift1 - bit operations on BIGNUMs =head1 SYNOPSIS #include <openssl/bn.h> int BN_set_bit(BIGNUM *a, int n); int BN_clear_bit(BIGNUM *a, int n); int BN_is_bit_set(const BIGNUM *a, int n); int BN_mask_bits(BIGNUM *a, int n); int BN_lshift(BIGNUM *r, const BIGNUM *a, int n); int BN_lshift1(BIGNUM *r, BIGNUM *a); int BN_rshift(BIGNUM *r, BIGNUM *a, int n); int BN_rshift1(BIGNUM *r, BIGNUM *a); =head1 DESCRIPTION BN_set_bit() sets bit B<n> in B<a> to 1 (C<a|=(1E<lt>E<lt>n)>). The number is expanded if necessary. BN_clear_bit() sets bit B<n> in B<a> to 0 (C<a&=~(1E<lt>E<lt>n)>). An error occurs if B<a> is shorter than B<n> bits. BN_is_bit_set() tests if bit B<n> in B<a> is set. BN_mask_bits() truncates B<a> to an B<n> bit number (C<a&=~((~0)E<lt>E<lt>n)>). An error occurs if B<a> already is shorter than B<n> bits. BN_lshift() shifts B<a> left by B<n> bits and places the result in B<r> (C<r=a*2^n>). Note that B<n> must be nonnegative. BN_lshift1() shifts B<a> left by one and places the result in B<r> (C<r=2*a>). BN_rshift() shifts B<a> right by B<n> bits and places the result in B<r> (C<r=a/2^n>). Note that B<n> must be nonnegative. BN_rshift1() shifts B<a> right by one and places the result in B<r> (C<r=a/2>). For the shift functions, B<r> and B<a> may be the same variable. =head1 RETURN VALUES BN_is_bit_set() returns 1 if the bit is set, 0 otherwise. All other functions return 1 for success, 0 on error. The error codes can be obtained by L<ERR_get_error(3)>. =head1 SEE ALSO L<BN_num_bytes(3)>, L<BN_add(3)> =head1 COPYRIGHT Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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