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Clarify that R=infinity is invalid in BIP340

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Also rename is_infinity to is_infinite is reference implementation,
to match the wording in BIP340.
This commit is contained in:
Pieter Wuille
2020-09-02 14:20:42 -07:00
parent d8531483f5
commit 3b1fb9600b
3 changed files with 9 additions and 4 deletions
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5
bip-0340/reference.py
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@@ -26,13 +26,15 @@ def tagged_hash(tag: str, msg: bytes) -> bytes:
tag_hash = hashlib.sha256(tag.encode()).digest()
return hashlib.sha256(tag_hash + tag_hash + msg).digest()
def is_infinity(P: Optional[Point]) -> bool:
def is_infinite(P: Optional[Point]) -> bool:
return P is None
def x(P: Point) -> int:
assert not is_infinite(P)
return P[0]
def y(P: Point) -> int:
assert not is_infinite(P)
return P[1]
def point_add(P1: Optional[Point], P2: Optional[Point]) -> Optional[Point]:
@@ -83,6 +85,7 @@ def hash_sha256(b: bytes) -> bytes:
return hashlib.sha256(b).digest()
def has_even_y(P: Point) -> bool:
assert not is_infinite(P)
return y(P) % 2 == 0
def pubkey_gen(seckey: bytes) -> bytes: