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Encode a binary string as a BIT STRING using :term:`DER` encoding.
Note, because there is no native Python object that can encode an actual
bit string, this function only accepts byte strings as the `s` argument.
The byte string is the actual bit string that will be encoded, padded
on the right (least significant bits, looking from big endian perspective)
to the first full byte. If the bit string has a bit length that is multiple
of 8, then the padding should not be included. For correct DER encoding
the padding bits MUST be set to 0.
Number of bits of padding need to be provided as the `unused` parameter.
In case they are specified as None, it means the number of unused bits
is already encoded in the string as the first byte.
The deprecated call convention specifies just the `s` parameters and
encodes the number of unused bits as first parameter (same convention
as with None).
Empty string must be encoded with `unused` specified as 0.
Future version of python-ecdsa will make specifying the `unused` argument
mandatory.
:param s: bytes to encode
:type s: bytes like object
:param unused: number of bits at the end of `s` that are unused, must be
between 0 and 7 (inclusive)
:type unused: int or None
:raises ValueError: when `unused` is too large or too small
:return: `s` encoded using DER
:rtype: bytes
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Remove a BIT STRING object from `string` following :term:`DER`.
The `expect_unused` can be used to specify if the bit string should
have the amount of unused bits decoded or not. If it's an integer, any
read BIT STRING that has number of unused bits different from specified
value will cause UnexpectedDER exception to be raised (this is especially
useful when decoding BIT STRINGS that have DER encoded object in them;
DER encoding is byte oriented, so the unused bits will always equal 0).
If the `expect_unused` is specified as None, the first element returned
will be a tuple, with the first value being the extracted bit string
while the second value will be the decoded number of unused bits.
If the `expect_unused` is unspecified, the decoding of byte with
number of unused bits will not be attempted and the bit string will be
returned as-is, the callee will be required to decode it and verify its
correctness.
Future version of python will require the `expected_unused` parameter
to be specified.
:param string: string of bytes to extract the BIT STRING from
:type string: bytes like object
:param expect_unused: number of bits that should be unused in the BIT
STRING, or None, to return it to caller
:type expect_unused: int or None
:raises UnexpectedDER: when the encoding does not follow DER.
:return: a tuple with first element being the extracted bit string and
the second being the remaining bytes in the string (if any); if the
`expect_unused` is specified as None, the first element of the returned
tuple will be a tuple itself, with first element being the bit string
as bytes and the second element being the number of unused bits at the
end of the byte array as an integer
:rtype: tuple
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