pqc/external/flint-2.4.3/fq_nmod/pth_root.c
2014-05-24 23:16:06 +02:00

46 lines
1.5 KiB
C

/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2013 Mike Hansen
******************************************************************************/
#include "fq_nmod.h"
void
fq_nmod_pth_root(fq_nmod_t rop, const fq_nmod_t op1, const fq_nmod_ctx_t ctx)
{
slong i, d;
if (fq_nmod_is_zero(op1, ctx) || fq_nmod_is_one(op1, ctx))
{
fq_nmod_set(rop, op1, ctx);
return;
}
/* TODO: Use modular composition */
d = fq_nmod_ctx_degree(ctx) - 1;
fq_nmod_set(rop, op1, ctx);
for (i = 0; i < d; i++)
{
fq_nmod_pow(rop, rop, fq_nmod_ctx_prime(ctx), ctx);
}
}