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/lib/python2.7/site-packages/pyasn1/codec/ber/
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[ NAME ] [ SIZE ] [ PERM ] [ DATE ] [ ACTN ]
+FILE +DIR
  __init__.py 0.058 KB -rw-r--r-- 2012-07-04 12:36 R E G D
  __init__.pyc 0.145 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  __init__.pyo 0.145 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  decoder.py 37.369 KB -rw-r--r-- 2015-04-25 22:57 R E G D
  decoder.pyc 28.385 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  decoder.pyo 28.385 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  encoder.py 15.935 KB -rw-r--r-- 2015-04-25 22:57 R E G D
  encoder.pyc 15.778 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  encoder.pyo 15.778 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  eoo.py 0.231 KB -rw-r--r-- 2006-04-24 14:26 R E G D
  eoo.pyc 0.614 KB -rw-r--r-- 2016-11-05 18:13 R E G D
  eoo.pyo 0.614 KB -rw-r--r-- 2016-11-05 18:13 R E G D
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# BER decoder from pyasn1.type import tag, univ, char, useful, tagmap from pyasn1.codec.ber import eoo from pyasn1.compat.octets import oct2int, isOctetsType from pyasn1 import debug, error class AbstractDecoder: protoComponent = None def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): raise error.PyAsn1Error('Decoder not implemented for %s' % (tagSet,)) def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): raise error.PyAsn1Error('Indefinite length mode decoder not implemented for %s' % (tagSet,)) class AbstractSimpleDecoder(AbstractDecoder): tagFormats = (tag.tagFormatSimple,) 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) class AbstractConstructedDecoder(AbstractDecoder): tagFormats = (tag.tagFormatConstructed,) 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() class ExplicitTagDecoder(AbstractSimpleDecoder): protoComponent = univ.Any('') tagFormats = (tag.tagFormatConstructed,) def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): if substrateFun: return substrateFun( self._createComponent(asn1Spec, tagSet, ''), substrate, length ) head, tail = substrate[:length], substrate[length:] value, _ = decodeFun(head, asn1Spec, tagSet, length) return value, tail 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') explicitTagDecoder = ExplicitTagDecoder() class IntegerDecoder(AbstractSimpleDecoder): protoComponent = univ.Integer(0) precomputedValues = { '\x00': 0, '\x01': 1, '\x02': 2, '\x03': 3, '\x04': 4, '\x05': 5, '\x06': 6, '\x07': 7, '\x08': 8, '\x09': 9, '\xff': -1, '\xfe': -2, '\xfd': -3, '\xfc': -4, '\xfb': -5 } def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): head, tail = substrate[:length], substrate[length:] if not head: return self._createComponent(asn1Spec, tagSet, 0), tail if head in self.precomputedValues: value = self.precomputedValues[head] else: firstOctet = oct2int(head[0]) if firstOctet & 0x80: value = -1 else: value = 0 for octet in head: value = value << 8 | oct2int(octet) return self._createComponent(asn1Spec, tagSet, value), tail class BooleanDecoder(IntegerDecoder): protoComponent = univ.Boolean(0) def _createComponent(self, asn1Spec, tagSet, value=None): return IntegerDecoder._createComponent(self, asn1Spec, tagSet, value and 1 or 0) class BitStringDecoder(AbstractSimpleDecoder): protoComponent = univ.BitString(()) tagFormats = (tag.tagFormatSimple, tag.tagFormatConstructed) 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? if not head: raise error.PyAsn1Error('Empty substrate') trailingBits = oct2int(head[0]) if trailingBits > 7: raise error.PyAsn1Error( 'Trailing bits overflow %s' % trailingBits ) head = head[1:] lsb = p = 0; l = len(head)-1; b = [] while p <= l: if p == l: lsb = trailingBits j = 7 o = oct2int(head[p]) while j >= lsb: b.append((o>>j)&0x01) j = j - 1 p = p + 1 return self._createComponent(asn1Spec, tagSet, b), tail 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 indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): r = self._createComponent(asn1Spec, tagSet, '') if substrateFun: return substrateFun(r, substrate, length) while substrate: component, substrate = decodeFun(substrate, self.protoComponent, allowEoo=True) if eoo.endOfOctets.isSameTypeWith(component) and \ component == eoo.endOfOctets: break r = r + component else: raise error.SubstrateUnderrunError( 'No EOO seen before substrate ends' ) return r, substrate class OctetStringDecoder(AbstractSimpleDecoder): protoComponent = univ.OctetString('') tagFormats = (tag.tagFormatSimple, tag.tagFormatConstructed) 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 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 indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): r = self._createComponent(asn1Spec, tagSet, '') if substrateFun: return substrateFun(r, substrate, length) while substrate: component, substrate = decodeFun(substrate, self.protoComponent, allowEoo=True) if eoo.endOfOctets.isSameTypeWith(component) and \ component == eoo.endOfOctets: break r = r + component else: raise error.SubstrateUnderrunError( 'No EOO seen before substrate ends' ) return r, substrate class NullDecoder(AbstractSimpleDecoder): protoComponent = univ.Null('') 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 class ObjectIdentifierDecoder(AbstractSimpleDecoder): protoComponent = univ.ObjectIdentifier(()) def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): head, tail = substrate[:length], substrate[length:] if not head: raise error.PyAsn1Error('Empty substrate') oid = () index = 0 substrateLen = len(head) while index < substrateLen: subId = oct2int(head[index]) index += 1 if subId < 128: oid = oid + (subId,) elif subId > 128: # Construct subid from a number of octets nextSubId = subId subId = 0 while nextSubId >= 128: subId = (subId << 7) + (nextSubId & 0x7F) if index >= substrateLen: raise error.SubstrateUnderrunError( 'Short substrate for sub-OID past %s' % (oid,) ) nextSubId = oct2int(head[index]) index += 1 oid = oid + ((subId << 7) + nextSubId,) elif subId == 128: # ASN.1 spec forbids leading zeros (0x80) in OID # encoding, tolerating it opens a vulnerability. See # http://www.cosic.esat.kuleuven.be/publications/article-1432.pdf # page 7 raise error.PyAsn1Error('Invalid octet 0x80 in OID encoding') # Decode two leading arcs if 0 <= oid[0] <= 39: oid = (0,) + oid elif 40 <= oid[0] <= 79: oid = (1, oid[0]-40) + oid[1:] elif oid[0] >= 80: oid = (2, oid[0]-80) + oid[1:] else: raise error.PyAsn1Error('Malformed first OID octet: %s' % head[0]) return self._createComponent(asn1Spec, tagSet, oid), tail class RealDecoder(AbstractSimpleDecoder): protoComponent = univ.Real() def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): head, tail = substrate[:length], substrate[length:] if not head: return self._createComponent(asn1Spec, tagSet, 0.0), tail fo = oct2int(head[0]); head = head[1:] if fo & 0x80: # binary encoding if not head: raise error.PyAsn1Error("Incomplete floating-point value") n = (fo & 0x03) + 1 if n == 4: n = oct2int(head[0]) head = head[1:] eo, head = head[:n], head[n:] if not eo or not head: raise error.PyAsn1Error('Real exponent screwed') e = oct2int(eo[0]) & 0x80 and -1 or 0 while eo: # exponent e <<= 8 e |= oct2int(eo[0]) eo = eo[1:] b = fo >> 4 & 0x03 # base bits if b > 2: raise error.PyAsn1Error('Illegal Real base') if b == 1: # encbase = 8 e *= 3 elif b == 2: # encbase = 16 e *= 4 p = 0 while head: # value p <<= 8 p |= oct2int(head[0]) head = head[1:] if fo & 0x40: # sign bit p = -p sf = fo >> 2 & 0x03 # scale bits p *= 2**sf value = (p, 2, e) elif fo & 0x40: # infinite value value = fo & 0x01 and '-inf' or 'inf' elif fo & 0xc0 == 0: # character encoding if not head: raise error.PyAsn1Error("Incomplete floating-point value") try: if fo & 0x3 == 0x1: # NR1 value = (int(head), 10, 0) elif fo & 0x3 == 0x2: # NR2 value = float(head) elif fo & 0x3 == 0x3: # NR3 value = float(head) else: raise error.SubstrateUnderrunError( 'Unknown NR (tag %s)' % fo ) except ValueError: raise error.SubstrateUnderrunError( 'Bad character Real syntax' ) else: raise error.SubstrateUnderrunError( 'Unknown encoding (tag %s)' % fo ) return self._createComponent(asn1Spec, tagSet, value), tail class SequenceDecoder(AbstractConstructedDecoder): protoComponent = univ.Sequence() def _getComponentTagMap(self, r, idx): try: return r.getComponentTagMapNearPosition(idx) except error.PyAsn1Error: return def _getComponentPositionByType(self, r, t, idx): return r.getComponentPositionNearType(t, idx) def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): head, tail = substrate[:length], substrate[length:] r = self._createComponent(asn1Spec, tagSet) idx = 0 if substrateFun: return substrateFun(r, substrate, length) while head: asn1Spec = self._getComponentTagMap(r, idx) component, head = decodeFun(head, asn1Spec) idx = self._getComponentPositionByType( r, component.getEffectiveTagSet(), idx ) r.setComponentByPosition(idx, component, asn1Spec is None) idx = idx + 1 r.setDefaultComponents() r.verifySizeSpec() return r, tail def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): r = self._createComponent(asn1Spec, tagSet) if substrateFun: return substrateFun(r, substrate, length) idx = 0 while substrate: asn1Spec = self._getComponentTagMap(r, idx) component, substrate = decodeFun(substrate, asn1Spec, allowEoo=True) if eoo.endOfOctets.isSameTypeWith(component) and \ component == eoo.endOfOctets: break idx = self._getComponentPositionByType( r, component.getEffectiveTagSet(), idx ) r.setComponentByPosition(idx, component, asn1Spec is None) idx = idx + 1 else: raise error.SubstrateUnderrunError( 'No EOO seen before substrate ends' ) r.setDefaultComponents() r.verifySizeSpec() return r, substrate class SequenceOfDecoder(AbstractConstructedDecoder): protoComponent = univ.SequenceOf() def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): head, tail = substrate[:length], substrate[length:] r = self._createComponent(asn1Spec, tagSet) if substrateFun: return substrateFun(r, substrate, length) asn1Spec = r.getComponentType() idx = 0 while head: component, head = decodeFun(head, asn1Spec) r.setComponentByPosition(idx, component, asn1Spec is None) idx = idx + 1 r.verifySizeSpec() return r, tail def indefLenValueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): r = self._createComponent(asn1Spec, tagSet) if substrateFun: return substrateFun(r, substrate, length) asn1Spec = r.getComponentType() idx = 0 while substrate: component, substrate = decodeFun(substrate, asn1Spec, allowEoo=True) if eoo.endOfOctets.isSameTypeWith(component) and \ component == eoo.endOfOctets: break r.setComponentByPosition(idx, component, asn1Spec is None) idx = idx + 1 else: raise error.SubstrateUnderrunError( 'No EOO seen before substrate ends' ) r.verifySizeSpec() return r, substrate class SetDecoder(SequenceDecoder): protoComponent = univ.Set() def _getComponentTagMap(self, r, idx): return r.getComponentTagMap() def _getComponentPositionByType(self, r, t, idx): nextIdx = r.getComponentPositionByType(t) if nextIdx is None: return idx else: return nextIdx class SetOfDecoder(SequenceOfDecoder): protoComponent = univ.SetOf() class ChoiceDecoder(AbstractConstructedDecoder): protoComponent = univ.Choice() tagFormats = (tag.tagFormatSimple, tag.tagFormatConstructed) def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length, state, decodeFun, substrateFun): head, tail = substrate[:length], substrate[length:] r = self._createComponent(asn1Spec, tagSet) if substrateFun: return substrateFun(r, substrate, length) if r.getTagSet() == tagSet: # explicitly tagged Choice component, head = decodeFun( head, r.getComponentTagMap() ) else: component, head = decodeFun( head, r.getComponentTagMap(), tagSet, length, state ) if isinstance(component, univ.Choice): effectiveTagSet = component.getEffectiveTagSet() else: effectiv