BN_ADD - Online Linux Manual PageSection : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMEBN_add, BN_sub, BN_mul, BN_sqr, BN_div, BN_mod, BN_nnmod, BN_mod_add, BN_mod_sub, BN_mod_mul, BN_mod_sqr, BN_exp, BN_mod_exp, BN_gcd − arithmetic operations on BIGNUMs
SYNOPSIS​ #include <openssl/bn.h> ​ ​ int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b); ​ ​ int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b); ​ ​ int BN_mul(BIGNUM *r, BIGNUM *a, BIGNUM *b, BN_CTX *ctx); ​ ​ int BN_sqr(BIGNUM *r, BIGNUM *a, BN_CTX *ctx); ​ ​ int BN_div(BIGNUM *dv, BIGNUM *rem, const BIGNUM *a, const BIGNUM *d, ​ BN_CTX *ctx); ​ ​ int BN_mod(BIGNUM *rem, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx); ​ ​ int BN_nnmod(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx); ​ ​ int BN_mod_add(BIGNUM *r, BIGNUM *a, BIGNUM *b, const BIGNUM *m, ​ BN_CTX *ctx); ​ ​ int BN_mod_sub(BIGNUM *r, BIGNUM *a, BIGNUM *b, const BIGNUM *m, ​ BN_CTX *ctx); ​ ​ int BN_mod_mul(BIGNUM *r, BIGNUM *a, BIGNUM *b, const BIGNUM *m, ​ BN_CTX *ctx); ​ ​ int BN_mod_sqr(BIGNUM *r, BIGNUM *a, const BIGNUM *m, BN_CTX *ctx); ​ ​ int BN_exp(BIGNUM *r, BIGNUM *a, BIGNUM *p, BN_CTX *ctx); ​ ​ int BN_mod_exp(BIGNUM *r, BIGNUM *a, const BIGNUM *p, ​ const BIGNUM *m, BN_CTX *ctx); ​ ​ int BN_gcd(BIGNUM *r, BIGNUM *a, BIGNUM *b, BN_CTX *ctx);
DESCRIPTION​BN_add() adds a and b and places the result in r (r=a+b). ​r may be the same BIGNUM as a or b. ​BN_sub() subtracts b from a and places the result in r (r=a−b). ​r may be the same BIGNUM as a or b. ​BN_mul() multiplies a and b and places the result in r (r=a*b). ​r may be the same BIGNUM as a or b. For multiplication by powers of 2, use BN_lshift (3). ​BN_sqr() takes the square of a and places the result in r (r=a^2). r and a may be the same BIGNUM. This function is faster than BN_mul(r,a,a). ​BN_div() divides a by d and places the result in dv and the remainder in rem (dv=a/d, rem=a%d). Either of dv and rem may be NULL, in which case the respective value is not returned. The result is rounded towards zero; thus if a is negative, the remainder will be zero or negative. For division by powers of 2, use BN_rshift (3). ​BN_mod() corresponds to BN_div() with dv set to NULL. ​BN_nnmod() reduces a modulo m and places the nonnegative remainder in r. ​BN_mod_add() adds a to b modulo m and places the nonnegative result in r. ​BN_mod_sub() subtracts b from a modulo m and places the nonnegative result in r. ​BN_mod_mul() multiplies a by b and finds the nonnegative remainder respective to modulus m (r=(a*b) mod m). r may be the same BIGNUM as a or b. For more efficient algorithms for repeated computations using the same modulus, see ​BN_mod_mul_montgomery (3) and ​BN_mod_mul_reciprocal (3). ​BN_mod_sqr() takes the square of a modulo m and places the result in r. ​BN_exp() raises a to the p−th power and places the result in r (r=a^p). This function is faster than repeated applications of ​BN_mul(). ​BN_mod_exp() computes a to the p−th power modulo m (r=a^p % m). This function uses less time and space than BN_exp(). Do not call this function when m is even and any of the parameters have the ​BN_FLG_CONSTTIME flag set. ​BN_gcd() computes the greatest common divisor of a and b and places the result in r. r may be the same BIGNUM as a or ​b. For all functions, ctx is a previously allocated BN_CTX used for temporary variables; see BN_CTX_new (3). Unless noted otherwise, the result BIGNUM must be different from the arguments.
RETURN VALUESFor all functions, 1 is returned for success, 0 on error. The return value should always be checked (e.g., if (!BN_add(r,a,b)) goto err;). The error codes can be obtained by ERR_get_error (3).
SEE ALSO​ERR_get_error (3), BN_CTX_new (3), ​BN_add_word (3), BN_set_bit (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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