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https://github.com/vale981/arb
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41 lines
1.5 KiB
C
41 lines
1.5 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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/* vector of log(k,a)*loga % order in Z/modZ */
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void
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dlog_vec_loop_add(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, xp, vx;
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vx = 0;
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for (x = a; x != 1; x = nmod_mul(x, a, mod))
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{
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vx = nmod_add(vx, va, order);
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for(xp = x; xp < nv; xp+=mod.n)
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if (v[xp] != DLOG_NONE)
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v[xp] = nmod_add(v[xp], vx, order);
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}
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}
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