Update libs

libs/pyasn1/codec/cer/decoder.py

@@ -7,22 +7,25 @@ from pyasn1 import error
 class BooleanDecoder(decoder.AbstractSimpleDecoder):
     protoComponent = univ.Boolean(0)
     def valueDecoder(self, fullSubstrate, substrate, asn1Spec, tagSet, length,
-                     state, decodeFun):
-        substrate = substrate[:length]
-        if not substrate:
+                     state, decodeFun, substrateFun):
+        head, tail = substrate[:length], substrate[length:]
+        if not head:
             raise error.PyAsn1Error('Empty substrate')
-        byte = oct2int(substrate[0])
+        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('Boolean CER violation: %s' % byte)
-        return self._createComponent(asn1Spec, tagSet, value), substrate[1:]
+        return self._createComponent(asn1Spec, tagSet, value), tail
 
 tagMap = decoder.tagMap.copy()
 tagMap.update({
-    univ.Boolean.tagSet: BooleanDecoder(),
+    univ.Boolean.tagSet: BooleanDecoder()
     })
 
 typeMap = decoder.typeMap