value. func ConstantTimeSelect(v, x, y int) int { return ^(v-1)&x | (v-1)&y } // ConstantTimeByteEq returns 1 if x == y and 0 otherwise. func ConstantTimeByteEq(x, y uint8) int { return int((uint32(x^y) - 1) >> 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...