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  • 2020-11-26 14:14
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这是一个用Java实现的DES高级加密算法的源代码
DES.zip
  • DES.java
    11.6KB
内容介绍
public class DES { // 置换IP表 private int[] IP_Table = { 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4, 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8, 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3, 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7 }; // 逆置换IP-1表 private int[] IPR_Table = { 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31, 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29, 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27, 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25 }; // E位选择表(扩展置换表) private int[] E_Table = { 32, 1, 2, 3, 4, 5, 4, 5, 6, 7, 8, 9, 8, 9, 10, 11, 12, 13, 12, 13, 14, 15, 16, 17, 16, 17, 18, 19, 20, 21, 20, 21, 22, 23, 24, 25, 24, 25, 26, 27, 28, 29, 28, 29, 30, 31, 32, 1 }; // P换位表(单纯换位表) private int[] P_Table = { 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10, 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25 }; // PC1选位表(密钥生成置换表1) private int[] PC1_Table = { 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 27, 19, 11, 3, 60, 52, 44, 36, 63, 55, 47, 39, 31, 23, 15, 7, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 28, 20, 12, 4 }; // PC2选位表(密钥生成置换表2) private int[] PC2_Table = { 14, 17, 11, 24, 1, 5, 3, 28, 15, 6, 21, 10, 23, 19, 12, 4, 26, 8, 16, 7, 27, 20, 13, 2, 41, 52, 31, 37, 47, 55, 30, 40, 51, 45, 33, 48, 44, 49, 39, 56, 34, 53, 46, 42, 50, 36, 29, 32 }; // 左移位数表 private int[] LOOP_Table = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; // S盒 private int[][] S_Box = { // 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 } }; public static void main(String[] args) { String plaintext = "Iloveyou"; // 明文 String key = "12345678"; // 密钥 DES des = new DES(); // 创建类对象des String ciphertext = des.encrypt(plaintext, key, "encrypt"); // 调用des对象中加密方法得到ciphertext密文 System.out.println("明文为:" + plaintext + "\n密钥为:" + key + "\n加密为:" + ciphertext + "\n"); // 显示明文、密钥以及加密后的密文 System.out.println("解密为:" + des.encrypt(ciphertext, key, "decrypt")); // 调用des对象中解密算法得到明文 } // 1 子密钥生成 public StringBuffer[] getSubKey(String key) { StringBuffer[] subKey = new StringBuffer[16]; // 存储子密钥 // 1.1 把密钥转换成二进制字符串 StringBuffer keyBinary = new StringBuffer(); // 存储转换后的二进制密钥 for (int i = 0; i < 8; ++i) { // 此处密钥字符个数设置<=8 StringBuffer mSubKeyTemp = new StringBuffer(Integer.toBinaryString(key.charAt(i))); // 把密钥key字符转为二进制 while (mSubKeyTemp.length() < 8) { // 当密钥字符个数不足8位时 mSubKeyTemp.insert(0, 0); // 在密钥前面进行0的填充 } keyBinary.append(mSubKeyTemp); // 把转换的二进制密钥放在keyBinary中 } // 1.2 通过PC1置换密钥【56位】 StringBuffer substituteKey = new StringBuffer(); // 存储PC1置换后的密钥 for (int i = 0; i < 56; ++i) { substituteKey.append(keyBinary.charAt(PC1_Table[i] - 1)); // 进行置换,例如i = 0时,PC1_Table[0]-1 = 57-1 = 56,charAt(56)就是把第57位放在第一位 } // 1.3 分成左右两块C0和D0 StringBuffer C0 = new StringBuffer(); // 存储密钥左块 StringBuffer D0 = new StringBuffer(); // 存储密钥右块 C0.append(substituteKey.substring(0, 28)); // C0为前28位 D0.append(substituteKey.substring(28)); // D0为剩余的后28位 // 1.4 循环16轮生成子密钥 for (int i = 0; i < 16; ++i) { // 根据LOOP_Table循环左移 for (int j = 0; j < LOOP_Table[i]; ++j) { char mTemp; mTemp = C0.charAt(0); //取出C0第一个数据放在mTemp中 C0.deleteCharAt(0); //删掉第一个数据 C0.append(mTemp); //在C0后面加上第一个数据,此步骤相当于左移一位 mTemp = D0.charAt(0); //D0左移操作和C0一样 D0.deleteCharAt(0); D0.append(mTemp); } // 把左右两块合并 StringBuffer C0D0 = new StringBuffer(C0.toString() + D0.toString());//C0(28比特)+D0(28比特)=56bit // 根据PC2压缩C0D0,得到子密钥 【56-->48位】 StringBuffer C0D0Temp = new StringBuffer(); for (int j = 0; j < 48; ++j) { C0D0Temp.append(C0D0.charAt(PC2_Table[j] - 1)); //方法同PC1置换密钥 } // 把子密钥存储到数组中 subKey[i] = C0D0Temp; } return subKey; } // 2 加密 / 解密 public String encrypt(String plaintext, String key, String type) { //通过type判断加解密 StringBuffer ciphertext = new StringBuffer(); // 存储密文 // 2.1 把明文转换成二进制字符串 StringBuffer plaintextBinary = new StringBuffer(); // 存储明文二进制 for (int i = 0; i < 8; ++i) { // 明文字符转换二进制方法同上述密钥 StringBuffer mSubPlaintextTemp = new StringBuffer(Integer.toBinaryString(plaintext.charAt(i))); while (mSubPlaintextTemp.length() < 8) { mSubPlaintextTemp.insert(0, 0); } plaintextBinary.append(mSubPlaintextTemp); } // 2.2 通过IP置换明文【64位】 StringBuffer substitutePlaintext = new StringBuffer(); // 存储置换后的明文 for (int i = 0
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