mirror of
https://github.com/vale981/arb
synced 2025-03-06 01:41:39 -05:00
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/*=============================================================================
|
|
|
|
This file is part of ARB.
|
|
|
|
ARB 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.
|
|
|
|
ARB 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 ARB; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2016 Pascal Molin
|
|
|
|
******************************************************************************/
|
|
|
|
#include "dlog.h"
|
|
|
|
void
|
|
dlog_1modpe_init(dlog_1modpe_t t, ulong a1, ulong p, ulong e, nmod_t pe)
|
|
{
|
|
if (e == 1)
|
|
{
|
|
t->inv1p = 1;
|
|
t->invloga1 = 0;
|
|
}
|
|
else
|
|
{
|
|
ulong loga1;
|
|
if (a1 == 1)
|
|
abort();
|
|
t->inv1p = nmod_inv(1 + p, pe); /* 1 - p + p^2 - ... */
|
|
loga1 = dlog_1modpe_mod1p(a1, p, e, t->inv1p, pe);
|
|
/* only need inverse mod p^(e-1) but does not hurt */
|
|
t->invloga1 = nmod_inv(loga1, pe);
|
|
}
|
|
}
|