54 lines
1.6 KiB
C
54 lines
1.6 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_zech.h"
|
||
|
|
|
||
|
|
void
|
||
|
|
fq_zech_frobenius(fq_zech_t rop, const fq_zech_t op, slong e,
|
||
|
|
const fq_zech_ctx_t ctx)
|
||
|
|
{
|
||
|
|
double qm1_inv;
|
||
|
|
slong d = fq_zech_ctx_degree(ctx);
|
||
|
|
|
||
|
|
e = e % d;
|
||
|
|
if (e < 0)
|
||
|
|
e += d;
|
||
|
|
|
||
|
|
if (fq_zech_is_zero(op, ctx))
|
||
|
|
{
|
||
|
|
fq_zech_zero(rop, ctx);
|
||
|
|
}
|
||
|
|
else if (e == 0)
|
||
|
|
{
|
||
|
|
fq_zech_set(rop, op, ctx);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
qm1_inv = n_precompute_inverse(ctx->qm1);
|
||
|
|
e = n_powmod(ctx->p, e, ctx->qm1);
|
||
|
|
rop->value = n_mulmod_precomp(op->value, e, ctx->qm1, qm1_inv);
|
||
|
|
}
|
||
|
|
}
|