def encode_enum(self, obj):
# empty enum
if len(obj._cont) == 0:
obj._msg = BER_TLV(self.get_name())
return
# get the maximum integer value to know the length on which to encode
if isinstance(self._ENC_ENUM_LEN, (int, long)) \
and self._ENC_ENUM_LEN % 8 == 0:
# encoder forcing ENUMERATED length
bit_len = abs(self._ENC_ENUM_LEN)
else:
# minimum byte length for ENUMERATED
bit_len = 1 + len_bits(max(obj._cont.values()))
miss_len = bit_len % 8
if miss_len != 0:
bit_len += 8 - miss_len
# and get the identifier integer value from the string value
V = Int('V', Pt=obj._cont[obj._val], Type='int%s'%bit_len,
Repr=self._REPR_ENUM)
if self._ENUM_BUILD_DICT:
V.Dict = dict([(i[1], i[0]) for i in obj._cont.items()])
#
obj._msg = BER_TLV(obj.get_name())
obj._msg.set(V)
self.handle_tag_enc(obj)
def decode_int_val(self, obj):
tlv = self.handle_tag_dec(obj)
# map to an Int, given the length of the value part
bit_len = tlv[1]()*8
V = Int('V', Type='int%s'%bit_len, Repr=self._REPR_INT)
V.map(str(tlv[2]))
tlv.set(V)
#
obj._val = V()
def set_private_manual(self, priv):
if len(priv) < self.SIZE//8:
priv = b'\0'*(self.SIZE//8 - len(priv)) + priv
elif len(priv) > self.SIZE//8:
priv = priv[-self.SIZE//8:]
self.priv = Int('priv', Type=self.TYPE)
self.priv.map(priv)
if self.priv() >= self.MOD():
self.priv < self.priv() % self.MOD()
#
if _with_gmpy:
pub = int(pow(gmpy.mpz(self.GEN()),
gmpy.mpz(self.priv()),
gmpy.mpz(self.MOD())))
else:
pub = pow(self.GEN(), self.priv(), self.MOD())
self.pub = Int('pub', Pt=pub, Type=self.TYPE)
def __init__(self, with_options=False, with_security=False, **kwargs):
Layer3NASEMM.__init__(self, with_security)
self.extend([
Int('EMMCause', Pt=26, Type='uint8', Dict=EMMCause_dict),
Type4_TLV('AUTS', T=0x30, V=14 * '\0')
])
self.AUTS.V.Repr = 'hex'
self._post_init(with_options, **kwargs)
class TransTLV(Layer):
constructorList = [
Int(CallName='T', ReprName='Type', Type='uint16', Dict=TransAttType),
Int(CallName='L', ReprName='Length', Type='uint16'),
Str(CallName='V', ReprName='Value'),
]
def __init__(self, T=0x4000, V=None):
Layer.__init__(self,
CallName='TransTLV',
ReprName='Transform Attribute TLV')
self.T.Pt = T
self.L.Pt = self.V
self.L.PtFunc = lambda V: len(V)
self.V.Pt = V
self.V.Len = self.L
self.V.LenFunc = lambda L: int(L)
def __init__(self, with_options=True, **kwargs):
Layer3.__init__(self)
self.extend([ \
Int('GMMCause', Pt=1, Type='uint8', Dict=GMMCause_dict),
Type4_TLV('AUTS', T=0x30, V=14*'\0'),
])
self.AUTS.V.Repr = 'hex'
self._post_init(with_options, **kwargs)
def __init__(self, with_options=False, with_security=False, **kwargs):
Layer3NASEMM.__init__(self, with_security)
self.extend([
Int('EMMCause', Pt=0, Type='uint8', Dict=EMMCause_dict),
Type3_TV('T3442', T=0x5B, V='\0', Len=1),
Type4_TLV('T3346', T=0x5F, V='\0') # timer with Length attribute but fixed length (1 byte)...
])
self._post_init(with_options, **kwargs)
class EMMHeader(Layer):
constructorList = [
Bit('SH', ReprName='Security Header Type', Pt=0, BitLen=4,
Dict=SecHdr_dict, Repr='hum'),
Bit('PD', ReprName='Protocol Discriminator', Pt=7, BitLen=4,
Dict=PD_dict, Repr='hum'),
Int('Type', Type='uint8', Dict=EMM_dict, Repr='hum'),
]
class Cfg(Layer):
constructorList = [
Int(CallName='T', ReprName='Type', Type='uint16', Dict=CfgAttType),
Int(CallName='L', ReprName='Length', Type='uint16'),
Str(CallName='V', ReprName='Value'),
]
def __init__(self, T=1, V=None):
Layer.__init__(self,
CallName='Cfg',
ReprName='Configuration Attribute')
self.T.Pt = T
self.V.Pt = V
self.V.Len = self.L
self.V.LenFunc = lambda L: int(L)
self.L.Pt = self.V
self.L.PtFunc = lambda V: len(V)
class pay_CP(Layer):
constructorList = [
Int(CallName='Ptype', ReprName="Payload Type", Pt=47, Type='uint8', \
Dict=PayloadType, Trans=True),
Int(CallName='np', ReprName='Next Payload', Pt=0, Type='uint8', \
Dict=PayloadType),
Str(CallName='res', ReprName='Reserved', Pt='\x00', Len=1, Repr="hex"),
Int(CallName='len', ReprName='Length', Type='uint16'),
Int(CallName='cft', ReprName='Configuration Type', Type='uint8', Dict=CfgType),
Str(CallName='res2', ReprName='Reserved2', Pt='\x00\x00\x00', Len=3, Repr="hex"),
]
def __init__(self, cft=1):
Layer.__init__(self, CallName='CP', ReprName='Configuration')
self.cft.Pt = cft
self.len.Pt = self.get_payload
self.len.PtFunc = lambda pay: len(pay()) + 8
def __init__(self, with_options=False, with_security=False, **kwargs):
Layer3NAS.__init__(self, with_security)
self.extend([
Int('ESMCause', Pt=0, Type='uint8', Dict=ESMCause_dict),
Type4_TLV('ProtConfig', ReprName='Protocol Config Options',
T=0x27, V='\x80')
])
self._post_init(with_options, **kwargs)
class INIT_ACK(Layer):
constructorList = [
Int(CallName='type', ReprName='Chunk Type', Pt=2, Type='uint8', \
Dict=chunk_dict),
Bit(CallName='res', ReprName='Reserved', Pt=0, BitLen=5),
Bit(CallName='U', ReprName='Unordered', Pt=0, BitLen=1),
Bit(CallName='B', ReprName='Beginning', Pt=0, BitLen=1),
Bit(CallName='E', ReprName='Ending', Pt=0, BitLen=1),
Int(CallName='len', ReprName='Chunk Length', Type='uint16'),
Int(CallName='init', ReprName='Initiate Tag', Type='uint32'),
Int(CallName='a_rwnd', ReprName='Advertised Receiver Wundow Credit', \
Type='uint32'),
Int(CallName='outs', ReprName='Number of Outbound Streams', Type='uint16'),
Int(CallName='ins', ReprName='Number of Inbound Streams', Type='uint16'),
Int(CallName='itsn', ReprName='Initial Transmission Sequence Number', \
Type='uint32'),
]
def __init__(self, init=0x6D696368, a_rwnd=0x00100000, \
outs=10, ins=10, itsn=0x6D696368):
Layer.__init__(self,
CallName='init-ack',
ReprName='SCTP INIT ACK chunk')
self.len.Pt = self.get_payload
self.len.PtFunc = lambda pay: len(pay()) + 16
self.init.Pt = init
self.a_rwnd.Pt = a_rwnd
self.outs.Pt = outs
self.ins.Pt = ins
self.itsn.Pt = itsn
class SOF(segment):
constructorList = [
Int('mark', Pt=0xFF, Type='uint8', Repr='hex'),
Int('type', Pt=0xC0, Type='uint8', Repr='hum', Dict=Seg_dict),
Int('len', Pt=0, Type='uint16'),
Int('P', ReprName='Sample Precision', Pt=0, Type='uint8'),
Int('Y', ReprName='Number of lines', Pt=0, Type='uint16'),
Int('X', ReprName='Number of sample per line', Pt=0, Type='uint16'),
Int('Nf', ReprName='Number of image components in frame', Pt=0, \
Type='uint8'),
Str('components', Pt=''),
]
def __init__(self, **kwargs):
Layer.__init__(self, **kwargs)
self.components.Len = self.len
self.components.LenFunc = lambda l: l() - 8
self.len.Pt = self.components
self.len.PtFunc = lambda p: len(p) + 8
def map(self, s=''):
Layer.map(self, s)
if len(self.components) / 3.0 == self.Nf():
cpn_s = self.components()
self.remove(self.components)
while len(cpn_s) > 0:
self.append(SOFComponent())
self[-1].map(cpn_s)
cpn_s = cpn_s[3:]
def __init__(self, with_options=False, with_security=False, **kwargs):
Layer3NASEMM.__init__(self, with_security)
self.extend([
Int('ContType', ReprName='Generic Container Type', Pt=1,
Type='uint8', Dict=GeneContType_dict),
Type6_LVE('GenericContainer', V='\0'),
Type4_TLV('AddInfo', T=0x65, V='\0')
])
self._post_init(with_options, **kwargs)
def __init__(self, with_options=False, with_security=False, **kwargs):
Layer3NASEMM.__init__(self, with_security)
self.extend([
Int('EMMCause', Pt=0, Type='uint8', Dict=EMMCause_dict),
Type6_TLVE('ESMContainer', T=0x78, V=3*'\0'),
Type4_TLV('T3346', T=0x5F, V='\0'), # timer with Length attribute but fixed length (1 byte)...
Type4_TLV('T3402', T=0x16, V='\0') # and again...
])
self._post_init(with_options, **kwargs)
class pay_N(Layer):
constructorList = [
Int(CallName='Ptype', ReprName="Payload Type", Pt=40, Type='uint8', \
Dict=PayloadType, Trans=True),
Int(CallName='np', ReprName='Next Payload', Pt=0, Type='uint8', \
Dict=PayloadType),
Str(CallName='res', ReprName='Reserved', Pt='\x00', Len=1, Repr="hex"),
Int(CallName='len', ReprName='Length', Type='uint16'),
Str(CallName='n', ReprName='Nonce', Repr="hex"),
]
def __init__(self, n=None):
Layer.__init__(self, CallName='N', ReprName='Nonce')
self.n.Pt = n
self.n.Len = self.len
self.n.LenFunc = lambda len: int(len) - 4
self.len.Pt = self.n
self.len.PtFunc = lambda n: len(n) + 4
class AT_RES(TLV):
constructorList = [
Int(CallName="T", ReprName="Type", Pt=3, Type="uint8", Dict=SIMAKAAttribute),
Int(CallName="L", ReprName="Length", Type="uint8"),
Int(CallName="resLen", ReprName="RES Bits Length", Type="uint16"),
Str(CallName="res", ReprName="RES", Repr="hex"),
]
def __init__(self, res=''):
Layer.__init__(self, CallName='RES', ReprName='AT_RES')
self.res.Pt = res
self.res.PtFunc = lambda res: self.pad4( str(res), const=4 )
self.res.Len = self.resLen
self.res.LenFunc = lambda l: int(l)/8
self.resLen.Pt = self.res
self.resLen.PtFunc = lambda res: len(res.Pt)*8
self.L.Pt = self.res
self.L.PtFunc = lambda res: self.len4( len(res) + 4 )
class PAD(Layer):
constructorList = [
Int(CallName='type', ReprName='Chunk Type', Pt=0x84, \
Type='uint8', Dict=chunk_dict),
Bit(CallName='res', ReprName='Reserved', Pt=0, BitLen=5),
Bit(CallName='U', ReprName='Unordered', Pt=0, BitLen=1),
Bit(CallName='B', ReprName='Beginning', Pt=0, BitLen=1),
Bit(CallName='E', ReprName='Ending', Pt=0, BitLen=1),
Int(CallName='len', ReprName='Chunk Length', Type='uint16'),
Str(CallName='pad', ReprName='Padding Data', Repr='hex'),
]
padding_bytes = '\0'
def __init__(self, padlen=0):
Layer.__init__(self, CallName='pad', ReprName='SCTP PAD chunk')
self.pad.Pt = padlen * self.padding_bytes
self.len.Pt = self.pad
self.len.PtFunc = lambda pad: len(pad) + 4
class UMA_IE_old(Layer):
constructorList = [
Int(CallName='T', ReprName='Tag', Type='uint8', \
Dict=IEType),
Int(CallName='L', ReprName='Length', Type='uint8'),
Str(CallName='V', ReprName='Value'),
]
def __init__(self, T=1, V=''):
Layer.__init__(self, CallName='IE_old')
# Tag
self.T.Pt = T
# Length / Value business
self.V.Pt = V
self.V.Len = self.L
self.V.LenFunc = lambda L: int(L)
self.L.Pt = self.V
self.L.PtFunc = lambda V: len(V)
class ABORT(Layer):
constructorList = [
Int(CallName='type', ReprName='Chunk Type', Pt=6, Type='uint8', \
Dict=chunk_dict),
Bit(CallName='res', ReprName='Reserved', Pt=0, BitLen=5),
Bit(CallName='U', ReprName='Unordered', Pt=0, BitLen=1),
Bit(CallName='B', ReprName='Beginning', Pt=0, BitLen=1),
Bit(CallName='E', ReprName='Ending', Pt=0, BitLen=1),
Bit(CallName='res', ReprName='Reserved', Pt=0, BitLen=7),
Bit(CallName='T', ReprName='Transmit', BitLen=1),
Int(CallName='len', ReprName='Chunk Length', Type='uint16'),
]
def __init__(self, T=0):
Layer.__init__(self, CallName='abort', ReprName='SCTP ABORT chunk')
self.T.Pt = T
self.len.Pt = self.get_payload
self.len.PtFunc = lambda pay: len(pay()) + 4
class SMS_SUBMIT_REPORT_RP_ACK(Layer):
constructorList = [
Bit('spare', Pt=0, BitLen=1),
Bit('TP_UDHI', ReprName='TP User Data Header Indicator', Pt=0, BitLen=1),
Bit('spare', Pt=0, BitLen=4),
Bit('TP_MTI', ReprName='TP Message Type Indicator', Pt=0, BitLen=2, \
Repr='hum', Dict=TP_MTI_SCtoMS_dict),
TP_PI(),
TP_SCTS(),
TP_PID(),
TP_DCS(),
Int('TP_UDL', ReprName='User Data Length (in character)', Pt=0, \
Type='uint8'),
Str7b('TP_UD', Pt=''),
]
def __init__(self, with_options=False, **kwargs):
Layer.__init__(self, **kwargs)
self.TP_UDL.Pt = self.TP_UD
self.TP_UDL.PtFunc = self._get_udl
self.TP_UD.Len = self.TP_UDL
self.TP_UD.LenFunc = self._get_ud_len
if not with_options:
self.TP_PID.Trans = True
self.TP_DCS.Trans = True
self.TP_UDL.Trans = True
self.TP_UD.Trans = True
def _get_udl(self, _unused):
if hasattr(self.TP_DCS, 'Charset') \
and not self.TP_DCS.Charset.is_transparent():
if self.TP_DCS.Charset() == 1:
return len(self.TP_UD)
elif self.TP_DCS.Charset() == 2:
return len(self.TP_UD)//2
return len(self.TP_UD.decode())
def _get_ud_len(self, _unused):
if hasattr(self.TP_DCS, 'Charset') \
and not self.TP_DCS.Charset.is_transparent():
if self.TP_DCS.Charset() == 1:
return self.TP_UDL()
elif self.TP_DCS.Charset() == 2:
return self.TP_UDL()*2
return int(ceil(self.TP_UDL()*7.0/8))
def map(self, s=''):
s_len = len(s)
if s_len < 13:
self.TP_UD.Trans = True
if s_len < 12:
self.TP_UDL.Trans = True
if s_len < 11:
self.TP_DCS.Trans = True
if s_len < 10:
self.TP_PID.Trans = True
Layer.map(self, s)
class RP_SMMA(Layer):
'''
MS -> Net
'''
constructorList = [
Bit('spare', Pt=0, BitLen=5, Repr='hex'),
Bit('Type', Pt=6, BitLen=3, Repr='hum', Dict=RPType_dict),
Int('Ref', Type='uint8'),
]
class AT_NEXT_REAUTH_ID(TLV):
constructorList = [
Int(CallName="T", ReprName="Type", Pt=133, Type="uint8", Dict=SIMAKAAttribute),
Int(CallName="L", ReprName="Length", Type="uint8"),
Int(CallName="reautLen", ReprName="Actual Re-auth Identity Length", Type="uint16"),
Str(CallName="reaut", ReprName="Next Fast Re-authentication Username"),
]
def __init__(self, reaut=''):
Layer.__init__(self, CallName='reaut_ID', ReprName='AT_NEXT_REAUTH_ID')
self.reaut.Pt = reaut
self.reaut.PtFunc = lambda reau: self.pad4( str(reaut), const=4 )
self.reaut.Len = self.reautLen
self.reaut.LenFunc = lambda l: int(l)
self.reautLen.Pt = self.reaut
self.reautLen.PtFunc = lambda reaut: len(reaut.Pt)
self.L.Pt = self.reaut
self.L.PtFunc = lambda reaut: self.len4( len(reaut) + 4 )
class AT_VERSION_LIST(TLV):
constructorList = [
Int(CallName="T", ReprName="Type", Pt=15, Type="uint8", Dict=SIMAKAAttribute),
Int(CallName="L", ReprName="Length", Type="uint8"),
Int(CallName="listLen", ReprName="Length of Version List", Type="uint16"),
Str(CallName="list", ReprName="List of Supported Version", Repr="hex"),
]
def __init__(self, list="\x00\x01"):
Layer.__init__(self, CallName='VER_LIST', ReprName='AT_VERSION_LIST')
self.list.Pt = list
self.list.PtFunc = lambda list: self.pad4( str(list), const=4 )
self.list.Len = self.listLen
self.list.LenFunc = lambda l: int(l)
self.listLen.Pt = self.list
self.listLen.PtFunc = lambda list: len(list.Pt)
self.L.Pt = self.list
self.L.PtFunc = lambda list: self.len4( len(list) + 4 )
class AT_NEXT_PSEUDONYM(TLV):
constructorList = [
Int(CallName="T", ReprName="Type", Pt=132, Type="uint8", Dict=SIMAKAAttribute),
Int(CallName="L", ReprName="Length", Type="uint8"),
Int(CallName="pseuLen", ReprName="Actual Pseudonym Length", Type="uint16"),
Str(CallName="pseu", ReprName="Pseudonym"),
]
def __init__(self, pseu=''):
Layer.__init__(self, CallName='Pseudo', ReprName='AT_NEXT_PSEUDONYM')
self.pseu.Pt = pseu
self.pseu.PtFunc = lambda pseu: self.pad4( str(pseu), const=4 )
self.pseu.Len = self.pseuLen
self.pseu.LenFunc = lambda l: int(l)
self.pseuLen.Pt = self.pseu
self.pseuLen.PtFunc = lambda pseu: len(pseu.Pt)
self.L.Pt = self.pseu
self.L.PtFunc = lambda pseu: self.len4( len(pseu) + 4 )
class pay_V(Layer):
constructorList = [
Int(CallName='Ptype', ReprName="Payload Type", Pt=43, Type='uint8', \
Dict=PayloadType, Trans=True),
Int(CallName='np', ReprName='Next Payload', Pt=0, Type='uint8', \
Dict=PayloadType),
Str(CallName='res', ReprName='Reserved', Pt='\x00', Len=1, Repr="hex"),
Int(CallName='len', ReprName='Length', Type='uint16'),
Str(CallName='vid', ReprName='Vendor ID'),
]
def __init__(self, vid=None):
Layer.__init__(self, CallName='V', ReprName='Vendor ID')
self.vid.Pt = vid
self.vid.Len = self.len
self.vid.LenFunc = lambda len: int(len) - 4
self.len.Pt = self.vid
self.len.PtFunc = lambda vid: len(vid) + 4
class AT_IDENTITY(TLV):
constructorList = [
Int(CallName="T", ReprName="Type", Pt=14, Type="uint8", Dict=SIMAKAAttribute),
Int(CallName="L", ReprName="Length", Type="uint8"),
Int(CallName="idLen", ReprName="Actual Identity Length", Type="uint16"),
Str(CallName="id", ReprName="Identity"),
]
def __init__(self, id=''):
Layer.__init__(self, CallName='ID', ReprName='AT_IDENTITY')
self.id.Pt = id
self.id.PtFunc = lambda id: self.pad4( str(id), const=4 )
self.id.Len = self.idLen
self.id.LenFunc = lambda l: int(l)
self.idLen.Pt = self.id
self.idLen.PtFunc = lambda id: len(id.Pt)
self.L.Pt = self.id
self.L.PtFunc = lambda id: self.len4( len(id) + 4 )
class Elf64_Phdr(Layer):
constructorList = [
Int('p_type', Pt=0, Type='uint64', Dict=p_type_dict),
Int('p_offset', Pt=0, Type='uint64'),
Int('p_vaddr', Pt=0, Type='uint64'),
Int('p_paddr', Pt=0, Type='uint64'),
Int('p_filesz', Pt=0, Type='uint64'),
Int('p_memsz', Pt=0, Type='uint64'),
Int('p_flags', Pt=0, Type='uint64', Dict=p_flags_dict),
Int('p_align', Pt=0, Type='uint64'),
]
class Adaptation(Layer):
constructorList = [
Int('len', Pt=0, Type='uint8', Repr='hum'),
Str('adapt_data', ReprName='Raw adaption data', Pt='', Repr='hex')
]
def __init__(self):
Layer.__init__(self)
self.adapt_data.Len = self.len
self.adapt_data.LenFunc = lambda len: int(len) - 1
class FORWARD_TSN(Layer):
constructorList = [
Int(CallName='type', ReprName='Chunk Type', Pt=0xC0, Type='uint8', \
Dict=chunk_dict),
Bit(CallName='res', ReprName='Reserved', Pt=0, BitLen=5),
Bit(CallName='U', ReprName='Unordered', Pt=0, BitLen=1),
Bit(CallName='B', ReprName='Beginning', Pt=0, BitLen=1),
Bit(CallName='E', ReprName='Ending', Pt=0, BitLen=1),
Int(CallName='len', ReprName='Chunk Length', Type='uint16'),
Int(CallName='ctsn', ReprName='New Cumulative TSN', Type='uint32'),
]
def __init__(self, ctsn=0):
Layer.__init__(self,
CallName='fwdtsn',
ReprName='SCTP FORWARD_TSN chunk')
self.ctsn.Pt = ctsn
self.len.Pt = self.get_payload
self.len.PtFunc = lambda pay: len(pay()) + 8
class Header(Layer):
constructorList = [
Bit('TI', ReprName='Transaction Identifier Flag', Pt=0, BitLen=1, \
Dict=TI_dict, Repr='hum'),
Bit('TIO', ReprName='Transaction Identifier', Pt=0, BitLen=3, \
Repr='hum'),
Bit('PD', ReprName='Protocol Discriminator', Pt=9, BitLen=4, \
Dict=PD_dict, Repr='hum'),
Int('Type', Type='uint8', Dict=SMSCP_dict),
]
def set_private(self):
self.priv = Int('priv', Pt=_rand.randint(3, self.MOD()-1),
Type=self.TYPE)
if _with_gmpy:
pub = int(pow(gmpy.mpz(self.GEN()),
gmpy.mpz(self.priv()),
gmpy.mpz(self.MOD())))
else:
pub = pow(self.GEN(), self.priv(), self.MOD())
self.pub = Int('pub', Pt=pub, Type=self.TYPE)
def __init__(self, with_options=True, **kwargs):
Layer3.__init__(self)
self.extend([ \
Int('GMMCause', Pt=1, Type='uint8', Dict=GMMCause_dict),
Bit('spare', Pt=0, BitLen=4, Repr='hex'),
Bit('ForceStdby', ReprName='Force to standby', Pt=0, BitLen=4,
Repr='hum', Dict=ForceStdby_dict),
Type4_TLV('T3302', T=0x2A, V='\0'),
])
self._post_init(with_options, **kwargs)
def map(self, s=""):
Layer.map(self, s)
# map extensions
if len(s) >= len(self) + 2:
s = s[len(self) :]
# add extensions length
extl = Int("ext_length", Type="uint16")
extl.map(s)
self.append(extl)
s = s[2:]
l = extl()
if len(s) > l:
# truncate the buffer
s = s[:l]
elif len(s) < l:
# error
return
# add extensions
while s:
self.append(Extension())
self[-1].map(s)
s = s[len(self[-1]) :]
def decode_enum_val(self, obj):
tlv = self.handle_tag_dec(obj)
# map to an Int, given the length of the value part
bit_len = tlv[1]()*8
if bit_len:
V = Int('V', Type='int%s'%bit_len, Repr=self._REPR_ENUM)
V.map(str(tlv[2]))
if self._ENUM_BUILD_TYPE:
V.Dict = dict([(i[1], i[0]) for i in obj._cont.items()])
tlv.set(V)
#
val_int = V()
enum_int = obj._cont.values()
if val_int in enum_int:
obj._val = obj._cont.keys()[enum_int.index(val_int)]
elif obj._ext is not None:
# if extended index value is unknown,
# the decoded value cannot be retrieved
# WNG: we put a dummy string here as value
obj._val = '_ext_%i' % val_int
elif self._SAFE:
raise(ASN1_BER_DECODER('%s: invalid ENUMERATED identifier %s' \
% (obj.get_fullname(), val_int)))
def compute_shared_key(self, pub_peer):
if len(pub_peer) < self.SIZE//8:
pub_peer = b'\0'*(self.SIZE//8 - len(pub_peer)) + pub_peer
elif len(pub_peer) > self.SIZE//8:
pub_peer = pub_peer[-self.SIZE//8:]
self.pub_peer = Int('pub_peer', Type=self.TYPE)
self.pub_peer.map(pub_peer)
#
if _with_gmpy:
shk = int(pow(gmpy.mpz(self.pub_peer()),
gmpy.mpz(self.priv()),
gmpy.mpz(self.MOD())))
else:
shk = pow(self.pub_peer(), self.priv(), self.MOD())
self.shkey = Int('shkey', Pt=shk, Type=self.TYPE)
def __init__(self, mod=None, gen=None, size=None):
if size and 0 < size <= 2**20:
self.SIZE = size
self.TYPE = 'uint{0}'.format(self.SIZE)
self.MOD = Int('MOD', Pt=self.MOD, Type=self.TYPE)
self.GEN = Int('GEN', Pt=self.GEN, Type=self.TYPE)
#
if mod:
if len(mod) < self.SIZE//8:
mod = b'\0'*(self.SIZE//8 - len(mod)) + mod
elif len(mod) > self.SIZE//8:
mod = mod[-self.SIZE//8:]
self.MOD.map(mod)
if gen:
if len(gen) < self.SIZE//8:
gen = b'\0'*(self.SIZE//8 - len(gen)) + gen
elif len(gen) > self.SIZE//8:
gen = gen[-self.SIZE//8:]
self.GEN.map(gen)
#
self.priv = None
self.pub = None
self.pub_peer = None
self.shkey = None
class DH_Bytes(object):
'''
Diffie-Hellman computation.
Uses Python bytes of size SIZE as input / output.
Instance attributes:
SIZE: size of Diffie-Hellman exchanged values
TYPE: libmich Int.Type to be used, according to SIZE
MOD: modulus
GEN: generator
priv: user's private value
pub: user's public value, corresponding to the local priv one
pub_peer: peer's public value, corresponding to the received one
shkey: shared key computed from the pub_peer and priv ones
1) Initialize DH modulus and generator
dh = DH(mod, gen)
2) Generate or set the user's private value, and compute the user's public
value
dh.set_private() # automatic generation from randint(3, MOD-1)
dh.set_private_manual(priv) # manual setting with bytes
3) Get the user's public value to be sent to peer
pub = dh.get_public()
4) Compute shared secret from the received peer's public value
dh.compute_shared_key(pub_peer)
5) Get the computed shared secret
key = dh.get_shared_key()
'''
SIZE = 2048
MOD = 3
GEN = 2
def __init__(self, mod=None, gen=None, size=None):
if size and 0 < size <= 2**20:
self.SIZE = size
self.TYPE = 'uint{0}'.format(self.SIZE)
self.MOD = Int('MOD', Pt=self.MOD, Type=self.TYPE)
self.GEN = Int('GEN', Pt=self.GEN, Type=self.TYPE)
#
if mod:
if len(mod) < self.SIZE//8:
mod = b'\0'*(self.SIZE//8 - len(mod)) + mod
elif len(mod) > self.SIZE//8:
mod = mod[-self.SIZE//8:]
self.MOD.map(mod)
if gen:
if len(gen) < self.SIZE//8:
gen = b'\0'*(self.SIZE//8 - len(gen)) + gen
elif len(gen) > self.SIZE//8:
gen = gen[-self.SIZE//8:]
self.GEN.map(gen)
#
self.priv = None
self.pub = None
self.pub_peer = None
self.shkey = None
def set_private(self):
self.priv = Int('priv', Pt=_rand.randint(3, self.MOD()-1),
Type=self.TYPE)
if _with_gmpy:
pub = int(pow(gmpy.mpz(self.GEN()),
gmpy.mpz(self.priv()),
gmpy.mpz(self.MOD())))
else:
pub = pow(self.GEN(), self.priv(), self.MOD())
self.pub = Int('pub', Pt=pub, Type=self.TYPE)
def set_private_manual(self, priv):
if len(priv) < self.SIZE//8:
priv = b'\0'*(self.SIZE//8 - len(priv)) + priv
elif len(priv) > self.SIZE//8:
priv = priv[-self.SIZE//8:]
self.priv = Int('priv', Type=self.TYPE)
self.priv.map(priv)
if self.priv() >= self.MOD():
self.priv < self.priv() % self.MOD()
#
if _with_gmpy:
pub = int(pow(gmpy.mpz(self.GEN()),
gmpy.mpz(self.priv()),
gmpy.mpz(self.MOD())))
else:
pub = pow(self.GEN(), self.priv(), self.MOD())
self.pub = Int('pub', Pt=pub, Type=self.TYPE)
def get_public(self):
return bytes(self.pub)
def compute_shared_key(self, pub_peer):
if len(pub_peer) < self.SIZE//8:
pub_peer = b'\0'*(self.SIZE//8 - len(pub_peer)) + pub_peer
elif len(pub_peer) > self.SIZE//8:
pub_peer = pub_peer[-self.SIZE//8:]
self.pub_peer = Int('pub_peer', Type=self.TYPE)
self.pub_peer.map(pub_peer)
#
if _with_gmpy:
shk = int(pow(gmpy.mpz(self.pub_peer()),
gmpy.mpz(self.priv()),
gmpy.mpz(self.MOD())))
else:
shk = pow(self.pub_peer(), self.priv(), self.MOD())
self.shkey = Int('shkey', Pt=shk, Type=self.TYPE)
def get_shared_key(self):
return bytes(self.shkey)
def __repr__(self):
if self.Repr == 'hum' \
and (self.Pt is not None or self.Val is not None):
return self.interpret()
else:
return Int.__repr__(self)
def __init__(self, **kwargs):
Int.__init__(self, CallName=split('\.', str(self.__class__))[-1][:-2], \
Type='uint8', **kwargs)