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ref10: p3_batchtobytes

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cathugger 2019-01-19 15:45:25 +00:00
parent ffb8498905
commit b7a027f633
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4 changed files with 21 additions and 2 deletions
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2
ed25519/ref10/fe.h
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@ -53,7 +53,7 @@ extern void fe_sq(fe,const fe);
extern void fe_sq2(fe,const fe);
extern void fe_mul121666(fe,const fe);
extern void fe_invert(fe,const fe);
extern void fe_batchinvert(fe *out[],fe tmp[],const fe *in[], size_t num);
extern void fe_batchinvert(fe *out[],fe tmp[],fe * const in[], size_t num);
extern void fe_pow22523(fe,const fe);
#endif

2
ed25519/ref10/fe_batchinvert.c
View file

@ -2,7 +2,7 @@
// tmp MUST != out
// in MAY == out
void fe_batchinvert(fe *out[],fe tmp[],const fe *in[], size_t num)
void fe_batchinvert(fe *out[],fe tmp[],fe * const in[], size_t num)
{
fe acc;
fe tmpacc;

2
ed25519/ref10/ge.h
View file

@ -55,6 +55,7 @@ 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_p2_0 crypto_sign_ed25519_ref10_ge_p2_0
#define ge_p3_0 crypto_sign_ed25519_ref10_ge_p3_0
@ -75,6 +76,7 @@ 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 int ge_frombytes_negate_vartime(ge_p3 *,const unsigned char *);
extern void ge_p2_0(ge_p2 *);

17
ed25519/ref10/ge_p3_batchtobytes.c Normal file
View file

@ -0,0 +1,17 @@
#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)
{
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_tobytes(out[i],y);
out[i][31] ^= fe_isnegative(x) << 7;
}
}