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https://github.com/vale981/arb
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56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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ARB is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with ARB; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2016 Pascal Molin
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******************************************************************************/
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#include "dlog.h"
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#include "padic.h"
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ulong
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dlog_modpe_init(dlog_modpe_t t, ulong a, ulong p, ulong e, ulong pe, ulong num)
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{
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t->p = p;
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t->e = e;
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t->pe = pe;
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dlog_precomp_n_init(t->modp, a, p, p-1, num);
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dlog_1modpe_init(t->modpe, n_powmod(a, p - 1, pe), p, e);
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return t->modp->cost + e;
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}
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void
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dlog_modpe_clear(dlog_modpe_t t)
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{
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dlog_precomp_clear(t->modp);
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dlog_1modpe_clear(t->modpe);
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}
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ulong
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dlog_modpe(const dlog_modpe_t t, ulong b)
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{
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ulong x;
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x = dlog_precomp(t->modp, b % t->p);
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/*b = b * n_powmod(t->a, -x, t->pe);*/
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b = n_powmod(b, t->p - 1, t->pe);
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x = x + (t->p-1) * dlog_1modpe(t->modpe, b);
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return x;
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}
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