BN_set_bit.3ssl - Man Page
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
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 <https://www.openssl.org/source/license.html>.
Referenced By
The man pages BN_clear_bit.3ssl(3), BN_is_bit_set.3ssl(3), BN_lshift1.3ssl(3), BN_lshift.3ssl(3), BN_mask_bits.3ssl(3), BN_rshift1.3ssl(3) and BN_rshift.3ssl(3) are aliases of BN_set_bit.3ssl(3).