mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
41 lines
1 KiB
C
41 lines
1 KiB
C
/*
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Copyright (C) 2016 Pascal Molin
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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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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