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pythonstringhexxor

List of hex string representations need to be XOR-ed

I need to XOR through a list of hex values but they are extracted from a text file so they are as strings how can I turn them into hex values?

An example list: 

['02', '0E', '00', '12', 'D2', '00', '00', '00', '00', '00', '00', 
'00', '00', '00', '00', 'CC', '02', '0C', '00', '10', '03', '00', 
'00', '00', '00', '00', '00', '00', '00', '1D', '02', '0A', '00', 
'04', '7E', 'F3', '34', '00', '00', '00', '00', 'B5', '02', '0E', 
'00', '12', 'CF', '00', '00', '00', '00', '00', '00', '00', '00',
'00', '00', 'D1', '02', '0E', '00', '12', 'CC', '00', '00', '00',
'00',  '00', '00', '00', '00', '00', '00', 'D2', '02', '0A', '00',
'04', '7F', 'F3', '34', '00', '00', '00', '00', 'B4', '02', '0A', 
'02', '0E', '00', '12', 'CF', '00', '00', '00', '00', '00']
Solution

  • Use the built-in function int():

    >> print(int('0e', 16))
14

    The second argument tells int() to expect numbers in hex, i.e. base 16.

    Note that there is no such thing as a "hex value"; hexadecimal is just a notation used when printing the number. 14 and 0xe are the same number.

    You can of course convert the entire list using a list comprehension:

    list2 = [int(x, 16) for x in list1]

    Assuming the original list of strings is list1.

    If you want to print the numbers in hex, use hex(), another built-in:

    >>> print(hex(int('e', 16)))
0xe