diff options
Diffstat (limited to 'bip-0340/test-vectors.py')
| -rw-r--r-- | bip-0340/test-vectors.py | 55 |
1 files changed, 35 insertions, 20 deletions
diff --git a/bip-0340/test-vectors.py b/bip-0340/test-vectors.py index 195b61b..d4674e9 100644 --- a/bip-0340/test-vectors.py +++ b/bip-0340/test-vectors.py @@ -2,14 +2,24 @@ import sys from reference import * def vector0(): - seckey = bytes_from_int(1) + seckey = bytes_from_int(3) msg = bytes_from_int(0) sig = schnorr_sign(msg, seckey) pubkey = pubkey_gen(seckey) - # The point reconstructed from the public key has an even Y coordinate. - pubkey_point = point_from_bytes(pubkey) - assert(pubkey_point[1] & 1 == 0) + # We should have at least one test vector where the seckey needs to be + # negated and one where it doesn't. In this one the seckey doesn't need to + # be negated. + x = int_from_bytes(seckey) + P = point_mul(G, x) + assert(y(P) % 2 == 0) + + # For historic reasons (pubkey tiebreaker was squareness and not evenness) + # we should have at least one test vector where the the point reconstructed + # from the public key has a square and one where it has a non-square Y + # coordinate. In this one Y is non-square. + pubkey_point = lift_x_even_y(pubkey) + assert(not has_square_y(pubkey_point)) return (seckey, pubkey, msg, sig, "TRUE", None) @@ -17,28 +27,33 @@ def vector1(): seckey = bytes_from_int(0xB7E151628AED2A6ABF7158809CF4F3C762E7160F38B4DA56A784D9045190CFEF) msg = bytes_from_int(0x243F6A8885A308D313198A2E03707344A4093822299F31D0082EFA98EC4E6C89) sig = schnorr_sign(msg, seckey) - pubkey = pubkey_gen(seckey) - - # The point reconstructed from the public key has an odd Y coordinate. - pubkey_point = point_from_bytes(pubkey) - assert(pubkey_point[1] & 1 == 1) - - return (seckey, pubkey, msg, sig, "TRUE", None) + return (seckey, pubkey_gen(seckey), msg, sig, "TRUE", None) def vector2(): seckey = bytes_from_int(0xC90FDAA22168C234C4C6628B80DC1CD129024E088A67CC74020BBEA63B14E5C9) - msg = bytes_from_int(0x5E2D58D8B3BCDF1ABADEC7829054F90DDA9805AAB56C77333024B9D0A508B75C) + msg = bytes_from_int(0x7E2D58D8B3BCDF1ABADEC7829054F90DDA9805AAB56C77333024B9D0A508B75C) sig = schnorr_sign(msg, seckey) + # The point reconstructed from the public key has a square Y coordinate. + pubkey = pubkey_gen(seckey) + pubkey_point = lift_x_even_y(pubkey) + assert(has_square_y(pubkey_point)) + # This signature vector would not verify if the implementer checked the # squareness of the X coordinate of R instead of the Y coordinate. - R = point_from_bytes(sig[0:32]) + R = lift_x_square_y(sig[0:32]) assert(not is_square(R[0])) - return (seckey, pubkey_gen(seckey), msg, sig, "TRUE", None) + return (seckey, pubkey, msg, sig, "TRUE", None) def vector3(): seckey = bytes_from_int(0x0B432B2677937381AEF05BB02A66ECD012773062CF3FA2549E44F58ED2401710) + + # Need to negate this seckey before signing + x = int_from_bytes(seckey) + P = point_mul(G, x) + assert(y(P) % 2 != 0) + msg = bytes_from_int(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) sig = schnorr_sign(msg, seckey) return (seckey, pubkey_gen(seckey), msg, sig, "TRUE", "test fails if msg is reduced modulo p or n") @@ -53,9 +68,9 @@ def insecure_schnorr_sign_fixed_nonce(msg, seckey0, k): if not (1 <= seckey0 <= n - 1): raise ValueError('The secret key must be an integer in the range 1..n-1.') P = point_mul(G, seckey0) - seckey = seckey0 if has_square_y(P) else n - seckey0 + seckey = seckey0 if has_even_y(P) else n - seckey0 R = point_mul(G, k) - e = int_from_bytes(tagged_hash("BIPSchnorr", bytes_from_point(R) + bytes_from_point(P) + msg)) % n + e = int_from_bytes(tagged_hash("BIP340/challenge", bytes_from_point(R) + bytes_from_point(P) + msg)) % n return bytes_from_point(R) + bytes_from_int((k + e * seckey) % n) # Creates a singature with a small x(R) by using k = 1/2 @@ -78,7 +93,7 @@ def vector5(): sig = schnorr_sign(msg, seckey) pubkey = bytes_from_int(0xEEFDEA4CDB677750A420FEE807EACF21EB9898AE79B9768766E4FAA04A2D4A34) - assert(point_from_bytes(pubkey) is None) + assert(lift_x_even_y(pubkey) is None) return (None, pubkey, msg, sig, "FALSE", "public key not on the curve") @@ -156,7 +171,7 @@ def vector11(): # Replace R's X coordinate with an X coordinate that's not on the curve x_not_on_curve = bytes_from_int(0x4A298DACAE57395A15D0795DDBFD1DCB564DA82B0F269BC70A74F8220429BA1D) - assert(point_from_bytes(x_not_on_curve) is None) + assert(lift_x_square_y(x_not_on_curve) is None) sig = x_not_on_curve + sig[32:64] return (None, pubkey_gen(seckey), msg, sig, "FALSE", "sig[0:32] is not an X coordinate on the curve") @@ -201,10 +216,10 @@ def vector14(): pubkey_int = p + 1 pubkey = bytes_from_int(pubkey_int) - assert(point_from_bytes(pubkey) is None) + assert(lift_x_even_y(pubkey) is None) # If an implementation would reduce a given public key modulo p then the # pubkey would be valid - assert(point_from_bytes(bytes_from_int(pubkey_int % p)) is not None) + assert(lift_x_even_y(bytes_from_int(pubkey_int % p)) is not None) return (None, pubkey, msg, sig, "FALSE", "public key is not a valid X coordinate because it exceeds the field size") |