def from_script(script):
if not ScriptMutlisig.match(script):
raise Exception("Not a TX_SCRIPT_HASH script")
m = get_pushed_smallint(script.instructions[0].opcode)
n = get_pushed_smallint(script.instructions[-2].opcode)
pubkeys = [script.instructions[i+1].data for i in range(n) ]
return ScriptMutlisig(m, pubkeys)
def from_script(script):
if not ScriptMutlisig.match(script):
raise Exception("Not a TX_SCRIPT_HASH script")
m = get_pushed_smallint(script.instructions[0].opcode)
n = get_pushed_smallint(script.instructions[-2].opcode)
pubkeys = [script.instructions[i + 1].data for i in range(n)]
return ScriptMutlisig(m, pubkeys)
def match(script):
if (len(script.instructions) <= 4 or # 4 is the minimum size (n=1)
script.instructions[-1].opcode != OP_CHECKMULTISIG or
not is_smallint_pushdata(script.instructions[-2].opcode)):
return False
n = get_pushed_smallint(script.instructions[-2].opcode)
if len(script.instructions) != n + 3: # n*pubkeys + (m,n,OP_CHECKMULTISIG)
return False
if not is_smallint_pushdata(script.instructions[0].opcode):
return False
m = get_pushed_smallint(script.instructions[0].opcode)
if m > n:
return False
for i in range(n):
if (not script.instructions[1+i].is_pushdata() or
not (33 <= len(script.instructions[1+i].data) <= 120)):
return False
return (True)
def match(script):
if (len(script.instructions) <= 4 or # 4 is the minimum size (n=1)
script.instructions[-1].opcode != OP_CHECKMULTISIG or
not is_smallint_pushdata(script.instructions[-2].opcode)):
return False
n = get_pushed_smallint(script.instructions[-2].opcode)
if len(script.instructions
) != n + 3: # n*pubkeys + (m,n,OP_CHECKMULTISIG)
return False
if not is_smallint_pushdata(script.instructions[0].opcode):
return False
m = get_pushed_smallint(script.instructions[0].opcode)
if m > n:
return False
for i in range(n):
if (not script.instructions[1 + i].is_pushdata() or
not (33 <= len(script.instructions[1 + i].data) <= 120)):
return False
return (True)