Make the curve B constant a secp256k1_fe
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@ -14,7 +14,7 @@
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/* These points can be generated in sage as follows:
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*
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* 0. Setup a worksheet with the following parameters.
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* b = 4 # whatever CURVE_B will be set to
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* b = 4 # whatever secp256k1_fe_const_b will be set to
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* F = FiniteField (0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F)
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* C = EllipticCurve ([F (0), F (b)])
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*
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@ -45,7 +45,8 @@ static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_GE_CONST(
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0x48DF246C, 0x808DAE72, 0xCFE52572, 0x7F0501ED
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);
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static const int CURVE_B = 4;
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static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(0, 0, 0, 0, 0, 0, 0, 4);
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# elif EXHAUSTIVE_TEST_ORDER == 13
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static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_GE_CONST(
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0xedc60018, 0xa51a786b, 0x2ea91f4d, 0x4c9416c0,
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@ -53,7 +54,9 @@ static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_GE_CONST(
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0x54cb1b6b, 0xdc8c1273, 0x087844ea, 0x43f4603e,
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0x0eaf9a43, 0xf6effe55, 0x939f806d, 0x37adf8ac
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);
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static const int CURVE_B = 2;
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static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(0, 0, 0, 0, 0, 0, 0, 2);
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# else
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# error No known generator for the specified exhaustive test group order.
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# endif
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@ -68,7 +71,7 @@ static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_GE_CONST(
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0xFD17B448UL, 0xA6855419UL, 0x9C47D08FUL, 0xFB10D4B8UL
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);
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static const int CURVE_B = 7;
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static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(0, 0, 0, 0, 0, 0, 0, 7);
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#endif
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static void secp256k1_ge_set_gej_zinv(secp256k1_ge *r, const secp256k1_gej *a, const secp256k1_fe *zi) {
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@ -219,14 +222,13 @@ static void secp256k1_ge_clear(secp256k1_ge *r) {
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}
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static int secp256k1_ge_set_xquad(secp256k1_ge *r, const secp256k1_fe *x) {
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secp256k1_fe x2, x3, c;
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secp256k1_fe x2, x3;
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r->x = *x;
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secp256k1_fe_sqr(&x2, x);
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secp256k1_fe_mul(&x3, x, &x2);
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r->infinity = 0;
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secp256k1_fe_set_int(&c, CURVE_B);
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secp256k1_fe_add(&c, &x3);
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return secp256k1_fe_sqrt(&r->y, &c);
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secp256k1_fe_add(&x3, &secp256k1_fe_const_b);
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return secp256k1_fe_sqrt(&r->y, &x3);
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}
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static int secp256k1_ge_set_xo_var(secp256k1_ge *r, const secp256k1_fe *x, int odd) {
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@ -270,15 +272,14 @@ static int secp256k1_gej_is_infinity(const secp256k1_gej *a) {
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}
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static int secp256k1_ge_is_valid_var(const secp256k1_ge *a) {
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secp256k1_fe y2, x3, c;
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secp256k1_fe y2, x3;
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if (a->infinity) {
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return 0;
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}
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/* y^2 = x^3 + 7 */
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secp256k1_fe_sqr(&y2, &a->y);
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secp256k1_fe_sqr(&x3, &a->x); secp256k1_fe_mul(&x3, &x3, &a->x);
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secp256k1_fe_set_int(&c, CURVE_B);
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secp256k1_fe_add(&x3, &c);
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secp256k1_fe_add(&x3, &secp256k1_fe_const_b);
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secp256k1_fe_normalize_weak(&x3);
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return secp256k1_fe_equal_var(&y2, &x3);
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}
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