BN_SET_BIT - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBN_set_bit, BN_clear_bit, BN_is_bit_set, BN_mask_bits, BN_lshift, BN_lshift1, BN_rshift, BN_rshift1 − bit operations on BIGNUMs
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);
DESCRIPTION​BN_set_bit() sets bit n in a to 1 (a|=(1<<n)). The number is expanded if necessary. ​BN_clear_bit() sets bit n in a to 0 (a&=~(1<<n)). An error occurs if a is shorter than n bits. ​BN_is_bit_set() tests if bit n in a is set. ​BN_mask_bits() truncates a to an n bit number (a&=~((~0)<<n)). An error occurs if a already is shorter than n bits. ​BN_lshift() shifts a left by n bits and places the result in ​r (r=a*2^n). Note that n must be nonnegative. BN_lshift1() shifts ​a left by one and places the result in r (r=2*a). ​BN_rshift() shifts a right by n bits and places the result in ​r (r=a/2^n). Note that n must be nonnegative. BN_rshift1() shifts ​a right by one and places the result in r (r=a/2). For the shift functions, r and a may be the same variable.
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 ERR_get_error (3).
SEE ALSO​BN_num_bytes (3), BN_add (3)
COPYRIGHTCopyright 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 <https://www.openssl.org/source/license.html>. 0
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