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Title "BN_add 3"
way too many mistakes in technical documents.
.nh
\fBBN_sub() subtracts b from a and places the result in r (\*(C`r=a-b\*(C'). \fIr may be the same \s-1BIGNUM\s0 as a or b.
\fBBN_mul() multiplies a and b and places the result in r (\*(C`r=a*b\*(C'). \fIr may be the same \s-1BIGNUM\s0 as a or b. For multiplication by powers of 2, use BN_lshift\|(3).
\fBBN_sqr() takes the square of a and places the result in r (\*(C`r=a^2\*(C'). r and a may be the same \s-1BIGNUM\s0. This function is faster than BN_mul(r,a,a).
\fBBN_div() divides a by d and places the result in dv and the remainder in rem (\*(C`dv=a/d, rem=a%d\*(C'). Either of dv and rem may be \s-1NULL\s0, 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).
\fBBN_mod() corresponds to BN_div() with dv set to \s-1NULL\s0.
\fBBN_nnmod() reduces a modulo m and places the nonnegative remainder in r.
\fBBN_mod_add() adds a to b modulo m and places the nonnegative result in r.
\fBBN_mod_sub() subtracts b from a modulo m and places the nonnegative result in r.
\fBBN_mod_mul() multiplies a by b and finds the nonnegative remainder respective to modulus m (\*(C`r=(a*b) mod m\*(C'). r may be the same \s-1BIGNUM\s0 as a or b. For more efficient algorithms for repeated computations using the same modulus, see \fBBN_mod_mul_montgomery\|(3) and \fBBN_mod_mul_reciprocal\|(3).
\fBBN_mod_sqr() takes the square of a modulo m and places the result in r.
\fBBN_exp() raises a to the p-th power and places the result in r (\*(C`r=a^p\*(C'). This function is faster than repeated applications of \fBBN_mul().
\fBBN_mod_exp() computes a to the p-th power modulo m (\*(C`r=a^p % m\*(C'). 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 \fB\s-1BN_FLG_CONSTTIME\s0 flag set.
\fBBN_gcd() computes the greatest common divisor of a and b and places the result in r. r may be the same \s-1BIGNUM\s0 as a or \fIb.
For all functions, ctx is a previously allocated \s-1BN_CTX\s0 used for temporary variables; see BN_CTX_new\|(3).
Unless noted otherwise, the result \s-1BIGNUM\s0 must be different from the arguments.
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
Indexes created Sun Apr 26 00:22:38 UTC 2026