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# CER encoder |
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from pyasn1.type import univ |
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from pyasn1.codec.ber import encoder |
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from pyasn1.compat.octets import int2oct, null |
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class BooleanEncoder(encoder.IntegerEncoder): |
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def encodeValue(self, encodeFun, client, defMode, maxChunkSize): |
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if client == 0: |
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substrate = int2oct(0) |
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else: |
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substrate = int2oct(255) |
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return substrate, 0 |
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class BitStringEncoder(encoder.BitStringEncoder): |
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def encodeValue(self, encodeFun, client, defMode, maxChunkSize): |
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return encoder.BitStringEncoder.encodeValue( |
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self, encodeFun, client, defMode, 1000 |
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) |
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class OctetStringEncoder(encoder.OctetStringEncoder): |
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def encodeValue(self, encodeFun, client, defMode, maxChunkSize): |
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return encoder.OctetStringEncoder.encodeValue( |
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self, encodeFun, client, defMode, 1000 |
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) |
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# specialized RealEncoder here |
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# specialized GeneralStringEncoder here |
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# specialized GeneralizedTimeEncoder here |
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# specialized UTCTimeEncoder here |
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class SetOfEncoder(encoder.SequenceOfEncoder): |
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def encodeValue(self, encodeFun, client, defMode, maxChunkSize): |
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if isinstance(client, univ.SequenceAndSetBase): |
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client.setDefaultComponents() |
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client.verifySizeSpec() |
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substrate = null; idx = len(client) |
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# This is certainly a hack but how else do I distinguish SetOf |
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# from Set if they have the same tags&constraints? |
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if isinstance(client, univ.SequenceAndSetBase): |
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# Set |
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comps = [] |
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while idx > 0: |
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idx = idx - 1 |
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if client[idx] is None: # Optional component |
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continue |
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if client.getDefaultComponentByPosition(idx) == client[idx]: |
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continue |
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comps.append(client[idx]) |
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comps.sort(key=lambda x: isinstance(x, univ.Choice) and \ |
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x.getMinTagSet() or x.getTagSet()) |
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for c in comps: |
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substrate += encodeFun(c, defMode, maxChunkSize) |
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else: |
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# SetOf |
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compSubs = [] |
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while idx > 0: |
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idx = idx - 1 |
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compSubs.append( |
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encodeFun(client[idx], defMode, maxChunkSize) |
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) |
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compSubs.sort() # perhaps padding's not needed |
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substrate = null |
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for compSub in compSubs: |
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substrate += compSub |
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return substrate, 1 |
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tagMap = encoder.tagMap.copy() |
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tagMap.update({ |
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univ.Boolean.tagSet: BooleanEncoder(), |
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univ.BitString.tagSet: BitStringEncoder(), |
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univ.OctetString.tagSet: OctetStringEncoder(), |
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univ.SetOf().tagSet: SetOfEncoder() # conflcts with Set |
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}) |
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typeMap = encoder.typeMap.copy() |
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typeMap.update({ |
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univ.Set.typeId: SetOfEncoder(), |
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univ.SetOf.typeId: SetOfEncoder() |
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}) |
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class Encoder(encoder.Encoder): |
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def __call__(self, client, defMode=0, maxChunkSize=0): |
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return encoder.Encoder.__call__(self, client, defMode, maxChunkSize) |
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encode = Encoder(tagMap, typeMap) |
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# EncoderFactory queries class instance and builds a map of tags -> encoders |
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ospaceteam /
outerspace
