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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 created.

  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)

Index for Section 3

Alphabetical listing for B

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