Class DerOctetString

object --+    
         |    
 DerObject --+
             |
            DerOctetString

Class to model a DER OCTET STRING.

An example of encoding is:

>>> from Crypto.Util.asn1 import DerOctetString
>>> from binascii import hexlify, unhexlify
>>> os_der = DerOctetString(b'\xaa')
>>> os_der.payload += b'\xbb'
>>> print hexlify(os_der.encode())

which will show 0402aabb, the DER encoding for the byte string b'\xAA\xBB'.

For decoding:

>>> s = unhexlify(b'0402aabb')
>>> try:
>>>   os_der = DerOctetString()
>>>   os_der.decode(s)
>>>   print hexlify(os_der.payload)
>>> except (ValueError, EOFError):
>>>   print "Not a valid DER OCTET STRING"

the output will be aabb.