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2 stage batching

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cathugger
2019-01-20 01:04:48 +02:00
parent 8f248cbd14
commit 596ebfc71a
3 changed files with 19 additions and 8 deletions
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16
ed25519/ref10/ge_p3_batchtobytes.c
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@@ -1,17 +1,23 @@
#include "ge.h"
// inz is ge_p3.Z pointer array. contents to .Zs will be overwritten
void ge_p3_batchtobytes_destructive(bytes32 out[],const ge_p3 in[],fe *inz[],fe tmp[],size_t num)
// NOTE: leaves in unfinished state
void ge_p3_batchtobytes_destructive_1(bytes32 out[],ge_p3 in[],fe *inz[],fe tmp[],size_t num)
{
fe x;
fe y;
fe_batchinvert(inz,tmp,inz,num);
for (size_t i = 0;i < num;++i) {
fe_mul(x,in[i].X,*inz[i]);
fe_mul(y,in[i].Y,*inz[i]);
fe_mul(y,in[i].Y,in[i].Z);
fe_tobytes(out[i],y);
out[i][31] ^= fe_isnegative(x) << 7;
}
}
void ge_p3_batchtobytes_destructive_finish(bytes32 out,ge_p3 *unf)
{
fe x;
// z of unfinished is inverted
fe_mul(x,unf->X,unf->Z);
out[31] ^= fe_isnegative(x) << 7;
}