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https://github.com/vale981/arb
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31 lines
890 B
C
31 lines
890 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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ulong
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dlog_power_init(dlog_power_t t, ulong a, ulong mod, ulong p, ulong e, ulong num)
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{
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int k;
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nmod_init(&t->mod, mod);
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t->p = p;
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t->e = e;
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t->apk = flint_malloc(e * sizeof(ulong));
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t->pre = flint_malloc(sizeof(dlog_precomp_struct));
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t->apk[0] = nmod_inv(a, t->mod);
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for (k = 1; k < e; k++)
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t->apk[k] = nmod_pow_ui(t->apk[k-1], p, t->mod);
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dlog_precomp_p_init(t->pre, nmod_inv(t->apk[e-1], t->mod), mod, p, e * num);
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return e * t->pre->cost;
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}
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