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52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/* expn.c: x^a mod n
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Copyright 2003 Bjoern Butscher, Hendrik Weimer
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This file is part of libquantum
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libquantum 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
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by the Free Software Foundation; either version 3 of the License,
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or (at your option) any later version.
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libquantum is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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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 libquantum; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <math.h>
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#include "defs.h"
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#include "gates.h"
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#include "omuln.h"
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#include "qureg.h"
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void
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quantum_exp_mod_n(int N, int x, int width_input, int width, quantum_reg *reg)
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{
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int i, j, f;
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quantum_sigma_x(2*width+2, reg);
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for (i=1; i<=width_input;i++){
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f=x%N; //compute
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for (j=1;j<i;j++)
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{
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f*=f; //x^2^(i-1)
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f= f%N;
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}
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mul_mod_n(N,f,3*width+1+i, width, reg);
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}
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}
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