/usr/lib/python2.7/dist-packages/pyasn1/codec/cer/encoder.py is in python-pyasn1 0.1.7-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | # CER encoder
from pyasn1.type import univ
from pyasn1.codec.ber import encoder
from pyasn1.compat.octets import int2oct, null
class BooleanEncoder(encoder.IntegerEncoder):
def encodeValue(self, encodeFun, client, defMode, maxChunkSize):
if client == 0:
substrate = int2oct(0)
else:
substrate = int2oct(255)
return substrate, 0
class BitStringEncoder(encoder.BitStringEncoder):
def encodeValue(self, encodeFun, client, defMode, maxChunkSize):
return encoder.BitStringEncoder.encodeValue(
self, encodeFun, client, defMode, 1000
)
class OctetStringEncoder(encoder.OctetStringEncoder):
def encodeValue(self, encodeFun, client, defMode, maxChunkSize):
return encoder.OctetStringEncoder.encodeValue(
self, encodeFun, client, defMode, 1000
)
# specialized RealEncoder here
# specialized GeneralStringEncoder here
# specialized GeneralizedTimeEncoder here
# specialized UTCTimeEncoder here
class SetOfEncoder(encoder.SequenceOfEncoder):
def encodeValue(self, encodeFun, client, defMode, maxChunkSize):
if isinstance(client, univ.SequenceAndSetBase):
client.setDefaultComponents()
client.verifySizeSpec()
substrate = null; idx = len(client)
# This is certainly a hack but how else do I distinguish SetOf
# from Set if they have the same tags&constraints?
if isinstance(client, univ.SequenceAndSetBase):
# Set
comps = []
while idx > 0:
idx = idx - 1
if client[idx] is None: # Optional component
continue
if client.getDefaultComponentByPosition(idx) == client[idx]:
continue
comps.append(client[idx])
comps.sort(key=lambda x: isinstance(x, univ.Choice) and \
x.getMinTagSet() or x.getTagSet())
for c in comps:
substrate += encodeFun(c, defMode, maxChunkSize)
else:
# SetOf
compSubs = []
while idx > 0:
idx = idx - 1
compSubs.append(
encodeFun(client[idx], defMode, maxChunkSize)
)
compSubs.sort() # perhaps padding's not needed
substrate = null
for compSub in compSubs:
substrate += compSub
return substrate, 1
tagMap = encoder.tagMap.copy()
tagMap.update({
univ.Boolean.tagSet: BooleanEncoder(),
univ.BitString.tagSet: BitStringEncoder(),
univ.OctetString.tagSet: OctetStringEncoder(),
univ.SetOf().tagSet: SetOfEncoder() # conflcts with Set
})
typeMap = encoder.typeMap.copy()
typeMap.update({
univ.Set.typeId: SetOfEncoder(),
univ.SetOf.typeId: SetOfEncoder()
})
class Encoder(encoder.Encoder):
def __call__(self, client, defMode=0, maxChunkSize=0):
return encoder.Encoder.__call__(self, client, defMode, maxChunkSize)
encode = Encoder(tagMap, typeMap)
# EncoderFactory queries class instance and builds a map of tags -> encoders
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