s = 取字节集长度(bin) b = 取空白字节集(s) 计次循环首(s ÷ 4 - 1, i) ii =(i - 1) × 4 b [ii + 1] = bin [ii + 2] b [ii + 2] = bin [ii + 3] b [ii + 3] = bin [ii + 4] b [ii + 4] = bin [ii + 1] 计次循环尾() b [13] = bin [13] b [14] = bin [14] b [15] = bin [15] b [16] = bin [16] 返回(b)