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usim/opc: Derive OPC from KI and OP

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This commit is contained in:
Holger Hans Peter Freyther
2012-03-22 15:23:14 +01:00
parent 93b38cd0f5
commit cca41795a7
1 changed files with 18 additions and 1 deletions
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19
pySim-prog.py
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@@ -102,6 +102,9 @@ def parse_options():
parser.add_option("-o", "--opc", dest="opc", parser.add_option("-o", "--opc", dest="opc",
help="OPC (default is to randomize)", help="OPC (default is to randomize)",
) )
parser.add_option("--op", dest="op",
help="Set OP to derive OPC from OP and KI",
)
parser.add_option("-z", "--secret", dest="secret", metavar="STR", parser.add_option("-z", "--secret", dest="secret", metavar="STR",
@@ -204,6 +207,19 @@ def calculate_luhn(cc):
check_digit = 10 - sum(num[-2::-2] + [sum(divmod(d * 2, 10)) for d in num[::-2]]) % 10 check_digit = 10 - sum(num[-2::-2] + [sum(divmod(d * 2, 10)) for d in num[::-2]]) % 10
return 0 if check_digit == 10 else check_digit return 0 if check_digit == 10 else check_digit
def derive_milenage_opc(ki_hex, op_hex):
"""
Run the milenage algorithm.
"""
from Crypto.Cipher import AES
from Crypto.Util.strxor import strxor
from pySim.utils import b2h
# We pass in hex string and now need to work on bytes
aes = AES.new(h2b(ki_hex))
opc_bytes = aes.encrypt(h2b(op_hex))
return b2h(strxor(opc_bytes, h2b(op_hex)))
def gen_parameters(opts): def gen_parameters(opts):
"""Generates Name, ICCID, MCC, MNC, IMSI, SMSP, Ki from the """Generates Name, ICCID, MCC, MNC, IMSI, SMSP, Ki from the
options given by the user""" options given by the user"""
@@ -305,7 +321,6 @@ def gen_parameters(opts):
ki = opts.ki ki = opts.ki
if not re.match('^[0-9a-fA-F]{32}$', ki): if not re.match('^[0-9a-fA-F]{32}$', ki):
raise ValueError('Ki needs to be 128 bits, in hex format') raise ValueError('Ki needs to be 128 bits, in hex format')
else: else:
ki = ''.join(['%02x' % random.randrange(0,256) for i in range(16)]) ki = ''.join(['%02x' % random.randrange(0,256) for i in range(16)])
@@ -315,6 +330,8 @@ def gen_parameters(opts):
if not re.match('^[0-9a-fA-F]{32}$', opc): if not re.match('^[0-9a-fA-F]{32}$', opc):
raise ValueError('OPC needs to be 128 bits, in hex format') raise ValueError('OPC needs to be 128 bits, in hex format')
elif opts.op is not None:
opc = derive_milenage_opc(ki, opts.op)
else: else:
opc = ''.join(['%02x' % random.randrange(0,256) for i in range(16)]) opc = ''.join(['%02x' % random.randrange(0,256) for i in range(16)])