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secp256k1
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Introduce SECP256K1_B macro for curve b coefficient

This commit is contained in:
Pieter Wuille 2023-01-10 16:23:32 -05:00
parent 4934aa7995
commit ce60785b26
2 changed files with 7 additions and 26 deletions
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7
sage/gen_exhaustive_groups.sage
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@ -96,10 +96,7 @@ def output_generator(g, name):
print(")")
def output_b(b):
print("static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(")
print(" 0x%08x, 0x%08x, 0x%08x, 0x%08x," % tuple((int(b) >> (32 * (7 - i))) & 0xffffffff for i in range(4)))
print(" 0x%08x, 0x%08x, 0x%08x, 0x%08x" % tuple((int(b) >> (32 * (7 - i))) & 0xffffffff for i in range(4, 8)))
print(");")
print(f"#define SECP256K1_B {int(b)}")
print()
print("To be put in src/group_impl.h:")
@ -128,7 +125,6 @@ for f in sorted(solutions.keys()):
first = False
print()
print(f"static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_G_ORDER_{f};")
print("")
output_b(b)
print()
print("# else")
@ -137,7 +133,6 @@ print("# endif")
print("#else")
print()
print("static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_G;")
print("")
output_b(7)
print()
print("#endif")

26
src/group_impl.h
View File

@ -49,29 +49,17 @@
# if EXHAUSTIVE_TEST_ORDER == 7
static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_G_ORDER_7;
static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000006
);
#define SECP256K1_B 6
# elif EXHAUSTIVE_TEST_ORDER == 13
static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_G_ORDER_13;
static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000002
);
#define SECP256K1_B 2
# elif EXHAUSTIVE_TEST_ORDER == 199
static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_G_ORDER_199;
static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000004
);
#define SECP256K1_B 4
# else
# error No known generator for the specified exhaustive test group order.
@ -79,15 +67,13 @@ static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(
#else
static const secp256k1_ge secp256k1_ge_const_g = SECP256K1_G;
static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(
0x00000000, 0x00000000, 0x00000000, 0x00000000,
0x00000000, 0x00000000, 0x00000000, 0x00000007
);
#define SECP256K1_B 7
#endif
/* End of section generated by sage/gen_exhaustive_groups.sage. */
static const secp256k1_fe secp256k1_fe_const_b = SECP256K1_FE_CONST(0, 0, 0, 0, 0, 0, 0, SECP256K1_B);
static void secp256k1_ge_set_gej_zinv(secp256k1_ge *r, const secp256k1_gej *a, const secp256k1_fe *zi) {
secp256k1_fe zi2;
secp256k1_fe zi3;