mirror of https://github.com/macssh/macssh.git
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
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/* mpz_jacobi (op1, op2).
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Contributed by Bennet Yee (bsy) at Carnegie-Mellon University
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Copyright (C) 1991, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include "gmp.h"
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/* Precondition: both p and q are positive */
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int
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#if __STDC__
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mpz_jacobi (mpz_srcptr pi, mpz_srcptr qi)
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#else
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mpz_jacobi (pi, qi)
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mpz_srcptr pi, qi;
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#endif
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{
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#if GCDCHECK
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int retval;
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mpz_t gcdval;
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mpz_init (gcdval);
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mpz_gcd (gcdval, pi, qi);
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if (!mpz_cmp_ui (gcdval, 1L))
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{
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/* J(ab,cb) = J(ab,c)J(ab,b) = J(ab,c)J(0,b) = J(ab,c)*0 */
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retval = 0;
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}
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else
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retval = mpz_legendre (pi, qi);
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mpz_clear (gcdval);
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return retval;
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#else
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return mpz_legendre (pi, qi);
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#endif
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}
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