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//return currrent number of CPU cycles since startup, or last roll over
tick() -> u64; 

//returns if two u64's are equal in constant time
ct_equal_u64(u64,u64) -> bool;

//returns if two u8's are equal in constant time
ct_equal_u8(u8,u8) -> bool; 

//Check if two slices are equal
//Panics if the lenghts are non-equal
ct_slice_eq( &[u8], &[u8]) -> bool;

//Optionally return one of two values
ct_optional_swap_u64(bool,u64,u64) -> u64;