1 /* mpz_invert (inv, x, n). Find multiplicative inverse of X in Z(N).
2 If X has an inverse, return non-zero and store inverse in INVERSE,
3 otherwise, return 0 and put garbage in X.
5 Copyright (C) 1996 Free Software Foundation, Inc.
7 This file is part of the GNU MP Library.
9 The GNU MP Library is free software; you can redistribute it and/or modify
10 it under the terms of the GNU Library General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or (at your
12 option) any later version.
14 The GNU MP Library is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
17 License for more details.
19 You should have received a copy of the GNU Library General Public License
20 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
21 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
22 MA 02111-1307, USA. */
28 mpz_invert (mpz_ptr inverse, mpz_srcptr x, mpz_srcptr n)
30 mpz_invert (inverse, x, n)
39 mpz_gcdext (gcd, inverse, (mpz_ptr) 0, x, n);
40 rv = gcd->_mp_size == 1 && (gcd->_mp_d)[0] == 1;