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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