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Diffstat (limited to 'mpz/jacobi.c')
-rw-r--r-- | mpz/jacobi.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/mpz/jacobi.c b/mpz/jacobi.c new file mode 100644 index 000000000..409f622fc --- /dev/null +++ b/mpz/jacobi.c @@ -0,0 +1,53 @@ +/* mpz_jacobi (op1, op2). + Contributed by Bennet Yee (bsy) at Carnegie-Mellon University + +Copyright (C) 1991, 1996 Free Software Foundation, Inc. + +This file is part of the GNU MP Library. + +The GNU MP Library is free software; you can redistribute it and/or modify +it under the terms of the GNU Library General Public License as published by +the Free Software Foundation; either version 2 of the License, or (at your +option) any later version. + +The GNU MP Library is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY +or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public +License for more details. + +You should have received a copy of the GNU Library General Public License +along with the GNU MP Library; see the file COPYING.LIB. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, +MA 02111-1307, USA. */ + +#include "gmp.h" + +/* Precondition: both p and q are positive */ + +int +#if __STDC__ +mpz_jacobi (mpz_srcptr pi, mpz_srcptr qi) +#else +mpz_jacobi (pi, qi) + mpz_srcptr pi, qi; +#endif +{ +#if GCDCHECK + int retval; + mpz_t gcdval; + + mpz_init (gcdval); + mpz_gcd (gcdval, pi, qi); + if (!mpz_cmp_ui (gcdval, 1L)) + { + /* J(ab,cb) = J(ab,c)J(ab,b) = J(ab,c)J(0,b) = J(ab,c)*0 */ + retval = 0; + } + else + retval = mpz_legendre (pi, qi); + mpz_clear (gcdval); + return retval; +#else + return mpz_legendre (pi, qi); +#endif +} |