make([]byte, total) copy(head, in) } tail = head[len(in):] return } // constantTimeSelectLe returns yes if a <= b, no otherwise, in constant time. func constantTimeSelectLe(a, b, yes, no int32) int32 { return int32(constanttime.Select(constanttime.LessOrEq(int(a), int(b)), int(yes), int(no))) } // constantTimeSelectEq returns yes if a == b, no otherwise, in constant time. func constantTimeSelectEq(a, b, yes, no uint32) uint32 { return uint32(constanttime.Select(constanttime.Eq(int32(a), int32(b)),...