def op_checksig(stack, z):
if len(stack) < 2:
return False
sec_pubkey = stack.pop()
der_signature = stack.pop()[:-1]
point = S256Point.parse(sec_pubkey)
sig = Signature.parse(der_signature)
if point.verify(z, sig):
stack.append(encode_num(1))
else:
stack.append(encode_num(0))
return True
def op_checksig(stack, z):
if len(stack) < 2:
return False
sec_pubkey = stack.pop()
der_signature = stack.pop()[:-1]
try:
point = S256Point.parse(sec_pubkey)
sig = Signature.parse(der_signature)
except (ValueError, SyntaxError) as e:
return False
if point.verify(z, sig):
stack.append(encode_num(1))
else:
stack.append(encode_num(0))
return True
def op_checkmultisig(stack, z):
if len(stack) < 1:
return False
n = decode_num(stack.pop())
if len(stack) < n + 1:
return False
sec_pubkeys = []
for _ in range(n):
sec_pubkeys.append(stack.pop())
m = decode_num(stack.pop())
if len(stack) < m + 1:
return False
der_signatures = []
for _ in range(m):
der_signatures.append(stack.pop()[:-1])
stack.pop()
try:
points = [S256Point.parse(sec) for sec in sec_pubkeys]
sigs = [Signature.parse(der) for der in der_signatures]
for sig in sigs:
if len(points) == 0:
print("signatures no good or not in right order")
return False
while points:
point = points.pop(0)
if point.verify(z, sig):
break
stack.append(encode_num(1))
except (ValueError, SyntaxError):
return False
return True
import op n = 65 e = op.encode_num(n) print(e) d = op.decode_num(e) print(d)
