NAME
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_get_error(3), BN_add(3)
HISTORY
BN_mod_inverse() is available in all versions of SSLeay and
OpenSSL.
