Libsodium utility functions
| increment_le | increment_le() treats x as an unsigned little-endian number and increments it.
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| memcmp | memcmp() returns true if x[0], x[1], ..., x[len-1] are the
same as y[0], y[1], ..., y[len-1]. Otherwise it returns false.
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| memzero | memzero() tries to effectively zero out the data in x even if
optimizations are being applied to the code.
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| pad | Tries to add padding to a sequence of bytes.
If the block size is zero, or the padded buffer's length
could overflow usize, this function returns Err.
Otherwise, it returns Ok wrapping the padded byte array.
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| unpad | Attempts to remove padding from a byte sequence created via pad().
If the padding is nonexistent, invalid, or the block size does not
match the blocksize argument of pad(), this returns Err.
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