def compute_challenge_poly(transcript, p):
"""
Compute challenge given transcript
"""
transcript = flatten(transcript)
m = hashlib.sha512()
for element in transcript:
try:
m.update(element.commitment.export())
except AttributeError:
try:
m.update(hex(element.commitment).encode())
except:
m.update(element.commitment.hex().encode())
hashed = m.hexdigest()
return (Bn.from_hex(hashed)).mod(Bn.from_num(p))
def compute_challenge(transcript, p):
"""Compute challenge given transcript
TODO: return something of the right size, l_c bits in the paper.
TODO: use proper unique encoding of elements
"""
m = hashlib.sha512()
for element in transcript:
try:
m.update(element.export())
except AttributeError:
try:
m.update(hex(element).encode())
except:
m.update(hex(element.vid).encode())
m.update(hex(element.index).encode())
m.update(hex(element.tag).encode())
m.update(hex(element.vote).encode())
hashed = m.hexdigest()
return (Bn.from_hex(hashed)).mod(Bn.from_num(p))