Libsodium utility functions
add_le | add_le() treats x and y as unsigned little-endian numbers and adds y to x
modulo 2^(8*len) in constant time.
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increment_le | increment_le() treats x as an unsigned little-endian number and increments it in
constant time.
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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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mlock | mlock() locks memory given region which can help avoiding swapping the
sensitive memory region to disk.
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munlock | munlock() unlocks memory region.
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