Package subtle implements functions that are often useful in cryptographic code but require careful thought to use correctly.
func ConstantTimeByteEq(x, y uint8) int
ConstantTimeByteEq returns 1 if x == y and 0 otherwise.
func ConstantTimeCompare(x, y []byte) int
ConstantTimeCompare returns 1 if the two slices, x and y, have equal contents and 0 otherwise. The time taken is a function of the length of the slices and is independent of the contents.
func ConstantTimeCopy(v int, x, y []byte)
ConstantTimeCopy copies the contents of y into x (a slice of equal length) if v == 1. If v == 0, x is left unchanged. Its behavior is undefined if v takes any other value.
func ConstantTimeEq(x, y int32) int
ConstantTimeEq returns 1 if x == y and 0 otherwise.
func ConstantTimeLessOrEq(x, y int) int
ConstantTimeLessOrEq returns 1 if x <= y and 0 otherwise. Its behavior is undefined if x or y are negative or > 2**31 - 1.
func ConstantTimeSelect(v, x, y int) int
ConstantTimeSelect returns x if v == 1 and y if v == 0. Its behavior is undefined if v takes any other value.
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Licensed under the Creative Commons Attribution License 3.0.
https://golang.org/pkg/crypto/subtle/