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Pad the input bytearray ``s`` to a multiple of ``blocksize``
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Remove ISO/IEC 7816-4 padding from the input byte array ``s``
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Increment the value of a byte-sequence interpreted
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Given a couple of *same-sized* byte sequences, interpreted as the
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the modular addition of the represented values, in constant time for
a given common length of the byte sequences.
:param a: input bytes buffer
:type a: bytes
:param b: input bytes buffer
:type b: bytes
:return: a byte-sequence representing, as a little-endian big integer,
the integer value of ``(to_int(a) + to_int(b)) mod 2^(8*len(a))``
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