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34 lines
643 B
C
34 lines
643 B
C
#include "fe.h"
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// tmp MUST != out or in
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// in MAY == out
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void fe_batchinvert(fe *out,fe *in,fe *tmp,size_t num,size_t shift)
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{
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fe acc;
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fe tmpacc;
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size_t i;
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fe *inp;
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fe *outp;
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fe_1(acc);
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inp = in;
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for (i = 0;i < num;++i) {
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fe_copy(tmp[i],acc);
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fe_mul(acc,acc,*inp);
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inp = (fe *)((char *)inp + shift);
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}
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fe_invert(acc,acc);
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i = num;
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inp = (fe *)((char *)in + shift * num);
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outp = (fe *)((char *)out + shift * num);
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while (i--) {
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inp = (fe *)((char *)inp - shift);
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outp = (fe *)((char *)outp - shift);
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fe_mul(tmpacc,acc,*inp);
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fe_mul(*outp,acc,tmp[i]);
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fe_copy(acc,tmpacc);
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}
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}
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