BN_mod_inverse (3)

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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 a new is created.

ctx is a previously allocated

used for temporary variables. r may be the same as a or n.

RETURN VALUES

BN_mod_inverse() returns the containing the inverse, and 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.