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BN_mod_inverse(3)					     BN_mod_inverse(3)

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
       The  BN_mod_inverse()  function	computes the inverse of a modulo n and
       places the result in r ((a*r)%n==1). If r is NULL, a new BIGNUM is cre‐
       ated.

       The  ctx is a previously allocated BN_CTX used for temporary variables.
       The r value may be the same BIGNUM as a or n.

RETURN VALUES
       The  BN_mod_inverse()  function	returns	 the  BIGNUM  containing   the
       inverse,	 and  NULL  on error. The error codes can be obtained by using
       ERR_get_error().

HISTORY
       The BN_mod_inverse() function is available in all  versions  of	SSLeay
       and OpenSSL.

SEE ALSO
       Functions: bn(3), err(3), BN_add(3)

							     BN_mod_inverse(3)

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