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2 stage batching

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cathugger 2019-01-20 01:04:48 +02:00
parent 8f248cbd14
commit 596ebfc71a
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GPG key ID: 9BADDA2DAF6F01A8
3 changed files with 19 additions and 8 deletions
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6
ed25519/ref10/ge.h
View file

@ -55,7 +55,8 @@ typedef unsigned char bytes32[32];
#define ge_frombytes_negate_vartime crypto_sign_ed25519_ref10_ge_frombytes_negate_vartime
#define ge_tobytes crypto_sign_ed25519_ref10_ge_tobytes
#define ge_p3_tobytes crypto_sign_ed25519_ref10_ge_p3_tobytes
#define ge_p3_batchtobytes_destructive crypto_sign_ed25519_ref10_ge_p3_batchtobytes_destructive
#define ge_p3_batchtobytes_destructive_1 crypto_sign_ed25519_ref10_ge_p3_batchtobytes_destructive_1
#define ge_p3_batchtobytes_destructive_finish crypto_sign_ed25519_ref10_ge_p3_batchtobytes_destructive_finish
#define ge_p2_0 crypto_sign_ed25519_ref10_ge_p2_0
#define ge_p3_0 crypto_sign_ed25519_ref10_ge_p3_0
@ -76,7 +77,8 @@ typedef unsigned char bytes32[32];
extern void ge_tobytes(unsigned char *,const ge_p2 *);
extern void ge_p3_tobytes(unsigned char *,const ge_p3 *);
extern void ge_p3_batchtobytes_destructive(bytes32 out[],const ge_p3 in[],fe *inz[],fe tmp[],size_t num);
extern void ge_p3_batchtobytes_destructive_1(bytes32 out[],ge_p3 in[],fe *inz[],fe tmp[],size_t num);
extern void ge_p3_batchtobytes_destructive_finish(bytes32 out,ge_p3 *unf);
extern int ge_frombytes_negate_vartime(ge_p3 *,const unsigned char *);
extern void ge_p2_0(ge_p2 *);

16
ed25519/ref10/ge_p3_batchtobytes.c
View file

@ -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;
}