BN_mod_inverse - compute inverse modulo n
SYNOPSIS
#include <openssl/bn.h>
BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
BN_CTX *ctx);
DESCRIPTION
BN_mod_inverse() computes the inverse of a modulo n places
the result in r ((a*r)%n==1). If r is NULL, a new BIGNUM
is created.
ctx is a previously allocated BN_CTX used for temporary
variables. r may be the same BIGNUM as a or n.
RETURN VALUES
BN_mod_inverse() returns the BIGNUM containing the
inverse, and NULL on error. The error codes can be
obtained by ERR_get_error(3).
SEE ALSO
bn(3), err(3), BN_add(3)
HISTORY
BN_mod_inverse() is available in all versions of SSLeay
and OpenSSL.
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