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ref10: batch invert maybe

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cathugger 2019-01-19 13:52:13 +00:00
parent f89c2d778c
commit 5bb3d0f821
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3 changed files with 32 additions and 3 deletions
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26
ed25519/ref10/fe_batchinvert.c Normal file
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@ -0,0 +1,26 @@
#include "fe.h"
// tmp MUST != out
// in MAY == out
void fe_batchinvert(fe out[],fe tmp[],const fe in[], size_t num)
{
fe acc;
fe tmpacc;
size_t i;
fe_1(acc);
for (i = 0;i < num;++i) {
fe_copy(tmp[i],acc);
fe_mul(acc,acc,in[i]);
}
fe_invert(acc,acc);
i = num;
while (i--) {
fe_mul(tmpacc,acc,in[i]);
fe_mul(out[i],acc,tmp[i]);
fe_copy(acc,tmpacc);
}
}