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Add group element storage type

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This commit is contained in:
Pieter Wuille 2015-01-25 00:31:56 -04:00
parent ff889f7d90
commit e68d7208ec
2 changed files with 28 additions and 0 deletions
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11
src/group.h
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@ -25,6 +25,11 @@ typedef struct {
int infinity; /* whether this represents the point at infinity */ int infinity; /* whether this represents the point at infinity */
} secp256k1_gej_t; } secp256k1_gej_t;
typedef struct {
secp256k1_fe_storage_t x;
secp256k1_fe_storage_t y;
} secp256k1_ge_storage_t;
/** Set a group element equal to the point at infinity */ /** Set a group element equal to the point at infinity */
static void secp256k1_ge_set_infinity(secp256k1_ge_t *r); static void secp256k1_ge_set_infinity(secp256k1_ge_t *r);
@ -99,4 +104,10 @@ static void secp256k1_gej_clear(secp256k1_gej_t *r);
/** Clear a secp256k1_ge_t to prevent leaking sensitive information. */ /** Clear a secp256k1_ge_t to prevent leaking sensitive information. */
static void secp256k1_ge_clear(secp256k1_ge_t *r); static void secp256k1_ge_clear(secp256k1_ge_t *r);
/** Convert a group element to the storage type. */
static void secp256k1_ge_to_storage(secp256k1_ge_storage_t *r, const secp256k1_ge_t*);
/** Convert a group element back from the storage type. */
static void secp256k1_ge_from_storage(secp256k1_ge_t *r, const secp256k1_ge_storage_t*);
#endif #endif

17
src/group_impl.h
View file

@ -392,6 +392,23 @@ static void secp256k1_gej_get_hex(char *r131, const secp256k1_gej_t *a) {
secp256k1_ge_get_hex(r131, &t); secp256k1_ge_get_hex(r131, &t);
} }
static void secp256k1_ge_to_storage(secp256k1_ge_storage_t *r, const secp256k1_ge_t *a) {
secp256k1_fe_t x, y;
VERIFY_CHECK(!a->infinity);
x = a->x;
secp256k1_fe_normalize(&x);
y = a->y;
secp256k1_fe_normalize(&y);
secp256k1_fe_to_storage(&r->x, &x);
secp256k1_fe_to_storage(&r->y, &y);
}
static void secp256k1_ge_from_storage(secp256k1_ge_t *r, const secp256k1_ge_storage_t *a) {
secp256k1_fe_from_storage(&r->x, &a->x);
secp256k1_fe_from_storage(&r->y, &a->y);
r->infinity = 0;
}
#ifdef USE_ENDOMORPHISM #ifdef USE_ENDOMORPHISM
static void secp256k1_gej_mul_lambda(secp256k1_gej_t *r, const secp256k1_gej_t *a) { static void secp256k1_gej_mul_lambda(secp256k1_gej_t *r, const secp256k1_gej_t *a) {
static const secp256k1_fe_t beta = SECP256K1_FE_CONST( static const secp256k1_fe_t beta = SECP256K1_FE_CONST(