fn any_overlap(x byte, y byte) bool
NOTE: require unsafe in future any_overlap reports whether x and y share memory at any (not necessarily corresponding) index. The memory beyond the slice length is ignored.
fn constant_time_byte_eq(x byte, y byte) int
constant_time_byte_eq returns 1 when x == y.
fn constant_time_compare(x byte, y byte) int
constant_time_compare returns 1 when x and y have equal contents. The runtime of this function is proportional of the length of x and y. It is NOT dependent on their content.
fn constant_time_copy(v int, mut x byte, y byte)
constant_time_copy copies the contents of y into x, when v == 1. When v == 0, x is left unchanged. this function is undefined, when v takes any other value
fn constant_time_eq(x int, y int) int
constant_time_eq returns 1 when x == y.
fn constant_time_less_or_eq(x int, y int) int
constant_time_less_or_eq returns 1 if x <= y, and 0 otherwise. it is undefined when x or y are negative, or > (2^32 - 1)
fn constant_time_select(v int, x int, y int) int
constant_time_select returns x when v == 1, and y when v == 0. it is undefined when v is any other value
fn inexact_overlap(x byte, y byte) bool
inexact_overlap reports whether x and y share memory at any non-corresponding index. The memory beyond the slice length is ignored. Note that x and y can have different lengths and still not have any inexact overlap. inexact_overlap can be used to implement the requirements of the crypto/cipher AEAD, Block, BlockMode and Stream interfaces.