详细代码，使用python和pyside，des八选一功能，是指在界面做一个八选一的按钮，把des的八个s盒放进去，功能是选中期其中一个s盒，输入六bit，可以输出对应4bit

以下是使用Python和PySide实现的简单代码，实现了一个DES的八选一功能界面。其中包括八个按钮对应DES的八个S盒，以及一个输入框和一个输出框。

import sys
from PySide2.QtWidgets import QApplication, QWidget, QPushButton, QLineEdit, QLabel, QVBoxLayout, QHBoxLayout

# DES的8个S盒
S_boxes = [
    # S1
    [
        [14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7],
        [0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8],
        [4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0],
        [15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]
    ],
    # S2
    [
        [15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10],
        [3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5],
        [0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15],
        [13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]
    ],
    # S3
    [
        [10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8],
        [13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1],
        [13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7],
        [1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]
    ],
    # S4
    [
        [7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15],
        [13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9],
        [10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4],
        [3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]
    ],
    # S5
    [
        [2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9],
        [14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6],
        [4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14],
        [11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]
    ],
    # S6
    [
        [12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11],
        [10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8],
        [9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6],
        [4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]
    ],
    # S7
    [
        [4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1],
        [13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6],
        [1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2],
        [6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]
    ],
    # S8
    [
        [13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7],
        [1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2],
        [7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8],
        [2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]
    ]
]

class DES_GUI(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # 创建八个按钮
        self.buttons = []
        for i in range(8):
            button = QPushButton("S{}".format(i+1))
            button.clicked.connect(lambda _, x=i: self.update_output(x))
            self.buttons.append(button)

        # 创建输入框和输出框
        self.input_box = QLineEdit()
        self.output_box = QLabel()

        # 创建布局并添加控件
        vbox = QVBoxLayout()
        for button in self.buttons:
            vbox.addWidget(button)
        hbox = QHBoxLayout()
        hbox.addWidget(QLabel("输入："))
        hbox.addWidget(self.input_box)
        vbox.addLayout(hbox)
        hbox = QHBoxLayout()
        hbox.addWidget(QLabel("输出："))
        hbox.addWidget(self.output_box)
        vbox.addLayout(hbox)

        # 设置窗口布局
        self.setLayout(vbox)

        # 设置窗口大小和标题
        self.setGeometry(300, 300, 300, 150)
        self.setWindowTitle('DES八选一')

    def update_output(self, index):
        # 获取输入的6个bit
        input_str = self.input_box.text()
        if len(input_str) != 6:
            return
        input_bits = [int(c) for c in input_str]

        # 计算输出的4个bit
        s_box = S_boxes[index]
        row = input_bits[0] * 2 + input_bits[5]
        col = input_bits[1] * 8 + input_bits[2] * 4 + input_bits[3] * 2 + input_bits[4]
        output_bits = [int(c) for c in bin(s_box[row][col])[2:].zfill(4)]

        # 更新输出框
        self.output_box.setText("".join(str(c) for c in output_bits))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    gui = DES_GUI()
    gui.show()
    sys.exit(app.exec_())

在代码中，我们首先定义了DES的八个S盒，并在`__init__`方法中创建了八个按钮，每个按钮对应一个S盒，并且连接到了`update_output`方法，该方法会在按钮被点击时被调用。该方法会获取输入框中的6个bit，然后根据选中的S盒计算出对应的4个bit，并将其更新到输出框中。

最后，我们创建了一个`DES_GUI`类，该类继承自`QWidget`，并在`initUI`方法中创建了八个按钮、一个输入框和一个输出框，并将它们添加到了窗口布局中。在`update_output`方法中，我们计算出对应的4个bit，并将其更新到输出框中。最后，我们创建了一个应用程序对象并显示窗口。