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ed25519-donna: batchpack maybe

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cathugger 2019-01-27 20:05:26 +02:00
parent f48239bbd7
commit 3406354480
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GPG key ID: 9BADDA2DAF6F01A8
3 changed files with 51 additions and 0 deletions
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25
ed25519/ed25519-donna/ed25519-donna-impl-base.h
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@ -188,6 +188,31 @@ ge25519_pack(unsigned char r[32], const ge25519 *p) {
r[31] ^= ((parity[0] & 1) << 7);
}
// assumes inz[] points to things in in[]
// NOTE: leaves in unfinished state
static void
ge25519_batchpack_destructive_1(bytes32 out[], ge25519 in[], bignum25519 *inz[], bignum25519 tmp[], size_t num) {
bignum25519 ty;
curve25519_batchrecip(inz, tmp, inz, num);
for (size_t i = 0; i < num; ++i) {
curve25519_mul(ty, in[i].y, in[i].z);
curve25519_contract(out[i], ty);
}
}
static void
ge25519_batchpack_destructive_finish(bytes32 out, ge25519 *unf) {
bignum25519 tx;
unsigned char parity[32];
// z of unfinished is inverted
curve25519_mul(tx, unf->x, unf->z);
curve25519_contract(parity, tx);
out[31] ^= ((parity[0] & 1) << 7);
}
static int
ge25519_unpack_negative_vartime(ge25519 *r, const unsigned char p[32]) {
static const unsigned char zero[32] = {0};

24
ed25519/ed25519-donna/ed25519-donna-impl-sse2.h
View file

@ -217,6 +217,30 @@ ge25519_pack(unsigned char r[32], const ge25519 *p) {
r[31] ^= ((parity[0] & 1) << 7);
}
// assumes inz[] points to things in in[]
// NOTE: leaves in unfinished state
static void
ge25519_batchpack_destructive_1(bytes32 out[], ge25519 in[], bignum25519 *inz[], bignum25519 tmp[], size_t num) {
bignum25519 ALIGN(16) ty;
curve25519_batchrecip(inz, tmp, inz, num);
for (size_t i = 0; i < num; ++i) {
curve25519_mul(ty, in[i].y, in[i].z);
curve25519_contract(out[i], ty);
}
}
static void
ge25519_batchpack_destructive_finish(bytes32 out, ge25519 *unf) {
bignum25519 ALIGN(16) tx;
unsigned char parity[32];
// z of unfinished is inverted
curve25519_mul(tx, unf->x, unf->z);
curve25519_contract(parity, tx);
out[31] ^= ((parity[0] & 1) << 7);
}
static int
ge25519_unpack_negative_vartime(ge25519 *r, const unsigned char p[32]) {

2
ed25519/ed25519-donna/ed25519-donna.h
View file

@ -94,6 +94,8 @@ typedef struct ge25519_pniels_t {
bignum25519 ysubx, xaddy, z, t2d;
} ge25519_pniels;
typedef unsigned char bytes32[32];
#include "ed25519-donna-basepoint-table.h"
#if defined(ED25519_64BIT)