Python Point.from_bytes示例

示例#1

文件： sapling_signatures.py 项目： uwuforever/zcash-test-vectors

 def verify(self, vk, M, sig):
     mid = cldiv(self.l_G, 8)
     (Rbar, Sbar) = (sig[:mid], sig[mid:])  # TODO: bitlength(r_j)
     R = Point.from_bytes(Rbar)
     S = leos2ip(Sbar)
     c = h_star(Rbar + M)
     return R and S < r_j and self.P_g * Fr(S) == R + vk * c

示例#2

文件： sapling_generators.py 项目： str4d/zcash-test-vectors

def group_hash(D, M):
    digest = blake2s(person=D)
    digest.update(CRS)
    digest.update(M)
    p = Point.from_bytes(digest.digest())
    if not p:
        return None
    q = p * JUBJUB_COFACTOR
    if q == Point.ZERO:
        return None
    return q