>> 31) } // ConstantTimeEq returns 1 if x == y and 0 otherwise. func ConstantTimeEq(x, y int32) int { return int((uint64(uint32(x^y)) - 1) >> 63) } // 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 ConstantTimeCopy(v int, x, y []byte) { if len(x) != len(y) { panic("subtle: slices have different lengths") } xmask := byte(v - 1) ymask := byte(^(v - 1)) for i := 0; i...