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Introduce secp256k1_scalar_t for future constant-time mod order operations

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This commit is contained in:
Pieter Wuille
2014-10-28 04:08:15 -07:00
parent b2bfdabdeb
commit a9f5c8b875
14 changed files with 319 additions and 149 deletions
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11
src/ecmult_gen_impl.h
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@@ -6,7 +6,7 @@
#define _SECP256K1_ECMULT_GEN_IMPL_H_
#include <assert.h>
#include "num.h"
#include "scalar.h"
#include "group.h"
#include "ecmult_gen.h"
@@ -100,24 +100,19 @@ static void secp256k1_ecmult_gen_stop(void) {
free(c);
}
void static secp256k1_ecmult_gen(secp256k1_gej_t *r, const secp256k1_num_t *gn) {
secp256k1_num_t n;
secp256k1_num_init(&n);
secp256k1_num_copy(&n, gn);
void static secp256k1_ecmult_gen(secp256k1_gej_t *r, const secp256k1_scalar_t *gn) {
const secp256k1_ecmult_gen_consts_t *c = secp256k1_ecmult_gen_consts;
secp256k1_gej_set_infinity(r);
secp256k1_ge_t add;
int bits;
for (int j=0; j<64; j++) {
bits = secp256k1_num_shift(&n, 4);
bits = secp256k1_scalar_get_bits(gn, j * 4, 4);
for (int k=0; k<sizeof(secp256k1_ge_t); k++)
((unsigned char*)(&add))[k] = c->prec[j][k][bits];
secp256k1_gej_add_ge(r, r, &add);
}
bits = 0;
secp256k1_ge_clear(&add);
secp256k1_num_clear(&n);
secp256k1_num_free(&n);
}
#endif