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Command: BN_mod_inverse | Section: 3 | Source: OpenBSD | File: BN_mod_inverse.3
BN_MOD_INVERSE(3) FreeBSD Library Functions Manual BN_MOD_INVERSE(3)
NAME
BN_mod_inverse - compute inverse modulo m
SYNOPSIS
#include <openssl/bn.h>
BIGNUM *
BN_mod_inverse(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx);
DESCRIPTION
BN_mod_inverse() computes the inverse of a modulo m and places the result
in r, so that r satisfies a * r == 1 (mod m). If r is NULL, a new BIGNUM
is allocated.
If the flag BN_FLG_CONSTTIME is set on a or m, it operates in constant
time.
ctx is a previously allocated BN_CTX used for temporary variables. r may
be the same BIGNUM as a or m.
RETURN VALUES
BN_mod_inverse() returns the BIGNUM containing the inverse, or NULL on
error. The error codes can be obtained by ERR_get_error(3).
SEE ALSO
BN_add(3), BN_new(3), BN_set_flags(3)
HISTORY
BN_mod_inverse() first appeared in SSLeay 0.5.1 and has been available
since OpenBSD 2.4.
The r argument was added in SSLeay 0.9.1 and OpenBSD 2.6.
FreeBSD 14.1-RELEASE-p8 October 21, 2023 FreeBSD 14.1-RELEASE-p8