Python pyasn1.error.PyAsn1Error() Examples

def prettyIn(self, value):
        if not isinstance(value, str):
            try:
                return int(value)
            except:
                raise error.PyAsn1Error(
                    'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
                    )
        r = self.__namedValues.getValue(value)
        if r is not None:
            return r
        try:
            return int(value)
        except:
            raise error.PyAsn1Error(
                'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
                ) 

def prettyIn(self, value):
        if not octets.isStringType(value):
            try:
                return int(value)
            except:
                raise error.PyAsn1Error(
                    'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
                )
        r = self.__namedValues.getValue(value)
        if r is not None:
            return r
        try:
            return int(value)
        except:
            raise error.PyAsn1Error(
                'Can\'t coerce %r into integer: %s' % (value, sys.exc_info()[1])
            ) 

def _cloneComponentValues(self, myClone, cloneValueFlag):
        try:
            c = self.getComponent()
        except error.PyAsn1Error:
            pass
        else:
            if isinstance(c, Choice):
                tagSet = c.getEffectiveTagSet()
            else:
                tagSet = c.getTagSet()
            if isinstance(c, base.AbstractConstructedAsn1Item):
                myClone.setComponentByType(
                    tagSet, c.clone(cloneValueFlag=cloneValueFlag)
                    )
            else:
                myClone.setComponentByType(tagSet, c.clone()) 

def clone(self, parentType, tagMap, uniq=False):
        if self.__defType is not None and tagMap.getDef() is not None:
            raise error.PyAsn1Error('Duplicate default value at %s' % (self,))
        if tagMap.getDef() is not None:
            defType = tagMap.getDef()
        else:
            defType = self.__defType
            
        posMap = self.__posMap.copy()
        for k in tagMap.getPosMap():
            if uniq and k in posMap:
                raise error.PyAsn1Error('Duplicate positive key %s' % (k,))
            posMap[k] = parentType

        negMap = self.__negMap.copy()
        negMap.update(tagMap.getNegMap())
        
        return self.__class__(
            posMap, negMap, defType,
            ) 

def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                             length, state, decodeFun, substrateFun):
        r = self._createComponent(asn1Spec, tagSet)
        if substrateFun:
            return substrateFun(r, substrate, length)
        if r.getTagSet() == tagSet:  # explicitly tagged Choice
            component, substrate = decodeFun(substrate, r.getComponentTagMap())
            # eat up EOO marker
            eooMarker, substrate = decodeFun(substrate, allowEoo=True)
            if not eoo.endOfOctets.isSameTypeWith(eooMarker) or \
                    eooMarker != eoo.endOfOctets:
                raise error.PyAsn1Error('No EOO seen before substrate ends')
        else:
            component, substrate = decodeFun(
                substrate, r.getComponentTagMap(), tagSet, length, state
            )
        if isinstance(component, univ.Choice):
            effectiveTagSet = component.getEffectiveTagSet()
        else:
            effectiveTagSet = component.getTagSet()
        r.setComponentByType(effectiveTagSet, component, 0, asn1Spec is None)
        return r, substrate 

def prettyIn(self, value):
            if isinstance(value, str):
                return value
            elif isinstance(value, unicode):
                try:
                    return value.encode(self._encoding)
                except (LookupError, UnicodeEncodeError):
                    raise error.PyAsn1Error(
                        'Can\'t encode string \'%s\' with \'%s\' codec' % (value, self._encoding)
                    )
            elif isinstance(value, (tuple, list)):
                try:
                    return ''.join([ chr(x) for x in value ])
                except ValueError:
                    raise error.PyAsn1Error(
                        'Bad OctetString initializer \'%s\'' % (value,)
                    )                
            else:
                return str(value) 

def fromBinaryString(self, value):
        bitNo = 8; byte = 0; r = ()
        for v in value:
            if bitNo:
                bitNo = bitNo - 1
            else:
                bitNo = 7
                r = r + (byte,)
                byte = 0
            if v == '0':
                v = 0
            elif v == '1':
                v = 1
            else:
                raise error.PyAsn1Error(
                    'Non-binary OCTET STRING initializer %s' % (v,)
                    )
            byte = byte | (v << bitNo)
        return octets.ints2octs(r + (byte,)) 

def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                     length, state, decodeFun, substrateFun):
        r = self._createComponent(asn1Spec, tagSet)
        if substrateFun:
            return substrateFun(r, substrate, length)
        if r.getTagSet() == tagSet: # explicitly tagged Choice
            component, substrate = decodeFun(substrate, r.getComponentTagMap())
            # eat up EOO marker
            eooMarker, substrate = decodeFun(substrate, allowEoo=True)
            if not eoo.endOfOctets.isSameTypeWith(eooMarker) or \
                    eooMarker != eoo.endOfOctets:
                raise error.PyAsn1Error('No EOO seen before substrate ends')
        else:
            component, substrate= decodeFun(
                substrate, r.getComponentTagMap(), tagSet, length, state
            )
        if isinstance(component, univ.Choice):
            effectiveTagSet = component.getEffectiveTagSet()
        else:
            effectiveTagSet = component.getTagSet()
        r.setComponentByType(effectiveTagSet, component, 0, asn1Spec is None)
        return r, substrate 

def __new__(cls):
        if cls._instance is None:
            def getPlug(name):
                def plug(self, *args, **kw):
                    raise error.PyAsn1Error('Uninitialized ASN.1 value ("%s" attribute looked up)' % name)
                return plug

            op_names = [name
                        for typ in (str, int, list, dict)
                        for name in dir(typ)
                        if name not in cls.skipMethods and name.startswith('__') and name.endswith('__') and callable(getattr(typ, name))]

            for name in set(op_names):
                setattr(cls, name, getPlug(name))

            cls._instance = object.__new__(cls)

        return cls._instance 

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length,
                     state, decodeFun, substrateFun):
        head, tail = substrate[:length], substrate[length:]
        if not head or length != 1:
            raise error.PyAsn1Error('Not single-octet Boolean payload')
        byte = oct2int(head[0])
        # CER/DER specifies encoding of TRUE as 0xFF and FALSE as 0x0, while
        # BER allows any non-zero value as TRUE; cf. sections 8.2.2. and 11.1 
        # in http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
        if byte == 0xff:
            value = 1
        elif byte == 0x00:
            value = 0
        else:
            raise error.PyAsn1Error('Unexpected Boolean payload: %s' % byte)
        return self._createComponent(asn1Spec, tagSet, value), tail

# TODO: prohibit non-canonical encoding 

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length,
                     state, decodeFun, substrateFun):
        head, tail = substrate[:length], substrate[length:]
        if not head or length != 1:
            raise error.PyAsn1Error('Not single-octet Boolean payload')
        byte = oct2int(head[0])
        # CER/DER specifies encoding of TRUE as 0xFF and FALSE as 0x0, while
        # BER allows any non-zero value as TRUE; cf. sections 8.2.2. and 11.1 
        # in http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
        if byte == 0xff:
            value = 1
        elif byte == 0x00:
            value = 0
        else:
            raise error.PyAsn1Error('Unexpected Boolean payload: %s' % byte)
        return self._createComponent(asn1Spec, tagSet, value), tail 

def __init__(self, *namedValues):
        self.nameToValIdx = {}
        self.valToNameIdx = {}
        self.namedValues = ()
        automaticVal = 1
        for namedValue in namedValues:
            if isinstance(namedValue, tuple):
                name, val = namedValue
            else:
                name = namedValue
                val = automaticVal
            if name in self.nameToValIdx:
                raise error.PyAsn1Error('Duplicate name %s' % (name,))
            self.nameToValIdx[name] = val
            if val in self.valToNameIdx:
                raise error.PyAsn1Error('Duplicate value %s=%s' % (name, val))
            self.valToNameIdx[val] = name
            self.namedValues = self.namedValues + ((name, val),)
            automaticVal += 1 

def getPositionNearType(self, tagSet, idx):
        if not self.__ambigiousTypes:
            self.__buildAmbigiousTagMap()
        try:
            return idx + self.__ambigiousTypes[idx].getPositionByType(tagSet)
        except KeyError:
            raise error.PyAsn1Error('Type position out of range') 

def encodeValue(self, encodeFun, value, defMode, maxChunkSize):
        raise error.PyAsn1Error('Not implemented') 

def setComponentByPosition(self, idx, value, verifyConstraints=True):
        raise error.PyAsn1Error('Method not implemented') 

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length,
                     state, decodeFun, substrateFun):
        head, tail = substrate[:length], substrate[length:]
        if tagSet[0][1] == tag.tagFormatSimple:  # XXX what tag to check?
            return self._createComponent(asn1Spec, tagSet, head), tail
        if not self.supportConstructedForm:
            raise error.PyAsn1Error('Constructed encoding form prohibited at %s' % self.__class__.__name__)
        r = self._createComponent(asn1Spec, tagSet, '')
        if substrateFun:
            return substrateFun(r, substrate, length)
        while head:
            component, head = decodeFun(head, self.protoComponent)
            r = r + component
        return r, tail 

def _verifySubtypeSpec(self, value, idx=None):
        try:
            self._subtypeSpec(value, idx)
        except error.PyAsn1Error:
            c, i, t = sys.exc_info()
            raise c('%s at %s' % (i, self.__class__.__name__)) 

def __getattr__(self, attr):
        if attr in self.skipMethods:
            raise AttributeError('attribute %s not present' % attr)
        raise error.PyAsn1Error('No value for "%s"' % attr) 

def getComponentByPosition(self, idx):
        raise error.PyAsn1Error('Method not implemented') 

def tagExplicitly(self, superTag):
        tagClass, tagFormat, tagId = superTag
        if tagClass == tagClassUniversal:
            raise error.PyAsn1Error(
                'Can\'t tag with UNIVERSAL-class tag'
            )
        if tagFormat != tagFormatConstructed:
            superTag = Tag(tagClass, tagFormatConstructed, tagId)
        return self + superTag 

def _getComponentTagMap(self, r, idx):
        try:
            return r.getComponentTagMapNearPosition(idx)
        except error.PyAsn1Error:
            return 

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                     length, state, decodeFun, substrateFun):
        head, tail = substrate[:length], substrate[length:]
        r = self._createComponent(asn1Spec, tagSet)
        if head:
            raise error.PyAsn1Error('Unexpected %d-octet substrate for Null' % length)
        return r, tail 

def __call__(self, client, defMode=False, maxChunkSize=0):
        return encoder.Encoder.__call__(self, client, defMode, maxChunkSize)


#: Turns ASN.1 object into CER octet stream.
#:
#: Takes any ASN.1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative)
#: walks all its components recursively and produces a CER octet stream.
#:
#: Parameters
#: ----------
#  value: any pyasn1 object (e.g. :py:class:`~pyasn1.type.base.PyAsn1Item` derivative)
#:     A pyasn1 object to encode
#:
#: defMode: :py:class:`bool`
#:     If `False`, produces indefinite length encoding
#:
#: maxChunkSize: :py:class:`int`
#:     Maximum chunk size in chunked encoding mode (0 denotes unlimited chunk size)
#:
#: Returns
#: -------
#: : :py:class:`bytes` (Python 3) or :py:class:`str` (Python 2)
#:     Given ASN.1 object encoded into BER octetstream
#:
#: Raises
#: ------
#: : :py:class:`pyasn1.error.PyAsn1Error`
#:     On encoding errors 

def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                             length, state, decodeFun, substrateFun):
        if substrateFun:
            return substrateFun(
                self._createComponent(asn1Spec, tagSet, ''),
                substrate, length
            )
        value, substrate = decodeFun(substrate, asn1Spec, tagSet, length)
        terminator, substrate = decodeFun(substrate, allowEoo=True)
        if eoo.endOfOctets.isSameTypeWith(terminator) and \
                terminator == eoo.endOfOctets:
            return value, substrate
        else:
            raise error.PyAsn1Error('Missing end-of-octets terminator') 

def _createComponent(self, asn1Spec, tagSet, value=None):
        if tagSet[0][1] not in self.tagFormats:
            raise error.PyAsn1Error('Invalid tag format %s for %s' % (tagSet[0], self.protoComponent.prettyPrintType()))
        if asn1Spec is None:
            return self.protoComponent.clone(tagSet)
        else:
            return asn1Spec.clone() 

def _createComponent(self, asn1Spec, tagSet, value=None):
        if tagSet[0][1] not in self.tagFormats:
            raise error.PyAsn1Error('Invalid tag format %s for %s' % (tagSet[0], self.protoComponent.prettyPrintType()))
        if asn1Spec is None:
            return self.protoComponent.clone(value, tagSet)
        elif value is None:
            return asn1Spec
        else:
            return asn1Spec.clone(value) 

def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                             length, state, decodeFun, substrateFun):
        raise error.PyAsn1Error('Indefinite length mode decoder not implemented for %s' % (tagSet,)) 

def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet,
                     length, state, decodeFun, substrateFun):
        raise error.PyAsn1Error('Decoder not implemented for %s' % (tagSet,)) 

def decode_dss_signature(signature):
    try:
        data, remaining = decoder.decode(signature, asn1Spec=_DSSSigValue())
    except PyAsn1Error:
        raise ValueError("Invalid signature data. Unable to decode ASN.1")

    if remaining:
        raise ValueError(
            "The signature contains bytes after the end of the ASN.1 sequence."
        )

    r = int(data.getComponentByName('r'))
    s = int(data.getComponentByName('s'))
    return (r, s) 

def __getitem__(self, tagSet):
        if tagSet in self.__posMap:
            return self.__posMap[tagSet]
        elif tagSet in self.__negMap:
            raise error.PyAsn1Error('Key in negative map')
        elif self.__defType is not None:
            return self.__defType
        else:
            raise KeyError()