const_time_select_bin() function

const_time_select_bin - Constant time binary buffer selection copy @mask: 0 (false) or -1 (true) to identify which value to copy @true_val: Buffer to copy for the true case @false_val: Buffer to copy for the false case @len: Number of octets to copy @dst: Destination buffer for the copy This function copies the specified buffer into the destination buffer using operations with identical memory access pattern regardless of which buffer is being copied.