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31 lines
630 B
C
31 lines
630 B
C
#include "params.h"
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#include "rq.h"
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void rq_mult(modq *h,const modq *f,const small *g)
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{
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modq fg[p + p - 1];
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modq result;
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int i, j;
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for (i = 0;i < p;++i) {
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result = 0;
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for (j = 0;j <= i;++j)
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result = modq_plusproduct(result,f[j],g[i - j]);
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fg[i] = result;
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}
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for (i = p;i < p + p - 1;++i) {
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result = 0;
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for (j = i - p + 1;j < p;++j)
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result = modq_plusproduct(result,f[j],g[i - j]);
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fg[i] = result;
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}
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for (i = p + p - 2;i >= p;--i) {
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fg[i - p] = modq_sum(fg[i - p],fg[i]);
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fg[i - p + 1] = modq_sum(fg[i - p + 1],fg[i]);
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}
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for (i = 0;i < p;++i)
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h[i] = fg[i];
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}
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