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https://github.com/vale981/arb
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31 lines
838 B
C
31 lines
838 B
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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/* vector of log(k,a)*loga % order in Z/modZ */
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void
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dlog_vec_loop(ulong * v, ulong nv, ulong a, ulong va, nmod_t mod, ulong na, nmod_t order)
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{
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ulong x, vx;
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dlog_vec_fill(v, nv, DLOG_NOT_FOUND);
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x = 1; vx = 0;
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do
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{
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if (x < nv)
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v[x] = vx;
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x = nmod_mul(x, a, mod);
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vx = nmod_add(vx, va, order);
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}
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while (x != 1);
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for (x = mod.n + 1; x < nv; x++)
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v[x] = v[x - mod.n];
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}
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