mirror of
https://github.com/vale981/arb
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52 lines
1.7 KiB
C
52 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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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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if (t->p == 2)
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return dlog_mod2e(t, b);
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x = dlog_precomp(t->modp, b % t->p);
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if (t->e > 1)
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{
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ulong b1, y;
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#if 0
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b1 = nmod_mul(b, nmod_pow_ui(t->inva, x, t->pe), t->pe);
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y = dlog_1modpe(t->modpe.rec, b1, t->p, t->e, t->pe);
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y = y % t->pe1;
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x = x + (t->p - 1) * y;
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#else
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b1 = nmod_pow_ui(b, t->p - 1, t->pe);
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y = dlog_1modpe(t->modpe, b1, t->p, t->e, t->pe);
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y = y % t->pe1;
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x = n_submod(x, y % (t->p - 1), t->p - 1);
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x = y + t->pe1 * x;
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#endif
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}
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return x;
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}
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