Class DerInteger

object --+    
         |    
 DerObject --+
             |
            DerInteger

Class to model a DER INTEGER.

An example of encoding is:

>>> from Crypto.Util.asn1 import DerInteger
>>> from binascii import hexlify, unhexlify
>>> int_der = DerInteger(9)
>>> print hexlify(int_der.encode())

which will show 020109, the DER encoding of 9.

And for decoding:

>>> s = unhexlify(b'020109')
>>> try:
>>>   int_der = DerInteger()
>>>   int_der.decode(s)
>>>   print int_der.value
>>> except (ValueError, EOFError):
>>>   print "Not a valid DER INTEGER"

the output will be 9.