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2022-05-19lib: introduce hexenc() and hexdec()Jo-Philipp Wich
Add two new functions to deal with encoding and decoding of hexadecimal digit strings: - hexenc() - convert the given input value into a lower case hex digit string, implicitely converting the input argument to a string value if needed - hexdec() - decode the given input hex digit string into a byte string, skipping whitespace or optionally specified characters in the input Signed-off-by: Jo-Philipp Wich <jo@mein.io>