import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.security.*;
import java.util.Base64;
public class DesTest {
// 将字节数组转换为 Base64 格式字符串
public static String toBase64(byte[] bytes) {
return Base64.getEncoder().encodeToString(bytes);
}
// 将 Base64 格式字符串转换为字节数组
public static byte[] fromBase64(String base64) {
return Base64.getDecoder().decode(base64);
}
// 将字节数组转换为 hex 格式字符串
public static String toHex(byte[] bytes) {
StringBuilder hex = new StringBuilder();
for (byte b : bytes) {
hex.append(String.format("%02x", b));
}
return hex.toString();
}
// 将 hex 格式字符串转换为字节数组
public static byte[] fromHex(String hex) {
byte[] bytes = new byte[hex.length() / 2];
for (int i = 0; i < hex.length(); i += 2) {
bytes[i / 2] = (byte) Integer.parseInt(hex.substring(i, i + 2), 16);
}
return bytes;
}
public static void main(String[] args) throws Exception {
String plaintext = "Hello World!";
String keyString = "keykeyke";
// 加密
SecretKeySpec key = new SecretKeySpec(keyString.getBytes("UTF-8"), "DES");
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] ciphertextBytes = cipher.doFinal(plaintext.getBytes("UTF-8"));
String ciphertextBase64 = toBase64(ciphertextBytes);
String ciphertextHex = toHex(ciphertextBytes);
System.out.println("Base64 ciphertext: " + ciphertextBase64);
System.out.println("Hex ciphertext: " + ciphertextHex);
// 解密
cipher.init(Cipher.DECRYPT_MODE, key);
byte[] decryptedBytesBase64 = cipher.doFinal(fromBase64(ciphertextBase64));
byte[] decryptedBytesHex = cipher.doFinal(fromHex(ciphertextHex));
String decryptedTextBase64 = new String(decryptedBytesBase64, "UTF-8");
String decryptedTextHex = new String(decryptedBytesHex, "UTF-8");
System.out.println("Decrypted text from Base64: " + decryptedTextBase64);
System.out.println("Decrypted text from hex: " + decryptedTextHex);
}
}
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
public class DESExample {
// 将字节数组转换为 Base64 格式字符串
public static String toBase64(byte[] bytes) {
return Base64.getEncoder().encodeToString(bytes);
}
// 将 Base64 格式字符串转换为字节数组
public static byte[] fromBase64(String base64) {
return Base64.getDecoder().decode(base64);
}
// 将字节数组转换为 hex 格式字符串
public static String toHex(byte[] bytes) {
StringBuilder hex = new StringBuilder();
for (byte b : bytes) {
hex.append(String.format("%02x", b));
}
return hex.toString();
}
// 将 hex 格式字符串转换为字节数组
public static byte[] fromHex(String hex) {
byte[] bytes = new byte[hex.length() / 2];
for (int i = 0; i < hex.length(); i += 2) {
bytes[i / 2] = (byte) Integer.parseInt(hex.substring(i, i + 2), 16);
}
return bytes;
}
public static void main(String[] args) throws Exception {
String plaintext = "HelloWorld";
String keyString = "01234567";
String ivString = "01234567";
// 加密
SecretKeySpec key = new SecretKeySpec(keyString.getBytes("UTF-8"), "DES");
IvParameterSpec iv = new IvParameterSpec(ivString.getBytes("UTF-8"));
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, iv);
byte[] ciphertextBytes = cipher.doFinal(plaintext.getBytes("UTF-8"));
String ciphertextBase64 = toBase64(ciphertextBytes);
String ciphertextHex = toHex(ciphertextBytes);
System.out.println("Base64 ciphertext: " + ciphertextBase64);
System.out.println("Hex ciphertext: " + ciphertextHex);
// 解密
cipher.init(Cipher.DECRYPT_MODE, key, iv);
byte[] decryptedBytesBase64 = cipher.doFinal(fromBase64(ciphertextBase64));
byte[] decryptedBytesHex = cipher.doFinal(fromHex(ciphertextHex));
String decryptedTextBase64 = new String(decryptedBytesBase64, "UTF-8");
String decryptedTextHex = new String(decryptedBytesHex, "UTF-8");
System.out.println("Decrypted text from Base64: " + decryptedTextBase64);
System.out.println("Decrypted text from hex: " + decryptedTextHex);
}
}
#include
#include
#include
#include
#include
//IP初始置换表
int IP_Table[64] = {
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
};
//IP逆置换表
int IPR_Table[64] = {
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
};
//f函数中E位选择表(扩展置换表)
int E_Table[48] = {
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
};
//f函数中的p表(4x8)
int P_Table[32] = {
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
};
int PC1_Table[56] = {
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)
int PC2_Table[48] = {
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
int LOOP_Table[16] = {
1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1
};
// S盒
int S_Box[8][4][16] = {
// 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
};
void ShowArray(int *array, int num);
void BitsCopy(int *DatOut, int *DatIn, int Len);
//将字符数组转换成二进制数组
void CharToBit(char *input, int *output, int bits) {
int i = 0;
for (i = 0; i < bits; i++) {
output[i] = (input[i / 8] >> (i % 8)) & 1;
}
}
//将二进制数组转换成字符数组
void BitToChar(int *input, char *output, int bits) {
int i = 0;
for (i = 0; i < (bits / 8); i++) {
output[i] = 0;
}
for (i = 0; i < bits; i++) {
output[i / 8] |= input[i] << (i % 8);
}
}
//完成异或操作
void Xor(int InA[], int InB[], int len) {
int i = 0;
for (i = 0; i < len; i++) {
InA[i] = InA[i] ^ InB[i]; //按位异或
}
}
//IP初始置换和逆置换函数,由table决定是逆置换还是初始置换
void IP_IPR(int input[64], int output[64], int table[64]) {
int i = 0;
for (i = 0; i < 64; i++) {
output[i] = input[table[i] - 1];
}
}
//E盒扩展
void E(int input[32], int output[48], int table[48]) {
int i = 0;
for (i = 0; i < 48; i++) {
output[i] = input[table[i] - 1];
}
}
//P盒替代
void P(int input[32], int output[32], int table[32]) {
int i = 0;
for (i = 0; i < 32; i++) {
output[i] = input[table[i] - 1];
}
}
//PC-1置换选择
void PC_1(int input[64], int output[56], int table[56]) {
int i = 0;
for (i = 0; i < 56; i++) {
output[i] = input[table[i] - 1];
}
}
//PC-2置换选择
void PC_2(int input[56], int output[48], int table[48]) {
int i = 0;
for (i = 0; i < 48; i++) {
output[i] = input[table[i] - 1];
}
}
//S盒压缩
void S(int input[48], int output[32], int table[8][4][16]) {
int i, X, Y; // i为8个S盒
for (i = 0, Y = 0, X = 0; i < 8; i++, input += 6, output += 4) // 每执行一次,输入数据偏移6位
{ // 每执行一次,输出数据偏移4位
Y = (input[0] << 1) + input[5]; // af代表第几行
X = (input[1] << 3) + (input[2] << 2) + (input[3] << 1) + input[4]; // bcde代表第几列
char temp = (char) table[i][4][16];
CharToBit(&temp, output, 4); // 把找到的点数据换为二进制
}
}
//F轮函数
void F_func(int input[32], int subkey[48]) {
int MiR[48] = {0};
int temp[32];
E(input, MiR, E_Table); // 输入32位通过E选位变为48位
printf("E盒扩展:\n");
ShowArray(MiR, 48);
Xor(MiR, subkey, 48); // 和子密钥异或
S(MiR, input, S_Box); // S盒变换
printf("S盒替代:\n");
ShowArray(input, 32);
BitsCopy(temp, input, 32);
P(temp, input, P_Table); // P置换后输出
printf("P盒置换:\n");
ShowArray(input, 32);
}
/*-------------------------------
把DatIn开始的长度位Len位的二进制
复制到DatOut后
--------------------------------*/
void BitsCopy(int *DatOut, int *DatIn, int Len) // 数组复制 OK
{
int i = 0;
for (i = 0; i < Len; i++) {
DatOut[i] = DatIn[i];
}
}
//子秘钥中循环左移函数
void RotateL(int input[28], int output[28], int loop) {
BitsCopy(output, input + loop, 28 - loop);
BitsCopy(output + 28 - loop, input, loop);
}
//子秘钥生成
void subKey_fun(int input[64], int Subkey[16][48]) {
int i = 0;
int temp[56];
int *KeyL = &temp[0], *KeyR = &temp[28];
printf("***子秘钥的生成:***\n");
PC_1(input, temp, PC1_Table);
printf("PC-1置换:\n");
ShowArray(temp, 56);
for (i = 0; i < 16; i++) {
printf("子秘钥第%d:\n", i + 1);
RotateL(KeyL, KeyL, LOOP_Table[i]); // 前28位左移
printf("循环左移后左部:\n");
ShowArray(KeyL, 28);
RotateL(KeyR, KeyR, LOOP_Table[i]); // 后28位左移
printf("循环左移后右部:\n");
ShowArray(KeyR, 28);
PC_2(temp, Subkey[i], PC2_Table);
printf("PC-2选择置换:\n");
ShowArray(Subkey[i], 48);
}
}
/*----------------------------------
二进制密文转换为十六进制
需要16个字符表示
-----------------------------------*/
void BitToHex(char *DatOut, int *DatIn, int Num) {
int i = 0;
for (i = 0; i < Num / 4; i++) {
DatOut[i] = 0;
}
for (i = 0; i < Num / 4; i++) {
DatOut[i] = DatIn[i * 4] + (DatIn[i * 4 + 1] << 1)
+ (DatIn[i * 4 + 2] << 2) + (DatIn[i * 4 + 3] << 3);
if ((DatOut[i] % 16) > 9) {
DatOut[i] = DatOut[i] % 16 + '7'; // 余数大于9时处理 10-15 to A-F
} // 输出字符
else {
DatOut[i] = DatOut[i] % 16 + '0'; // 输出字符
}
}
}
//DES加密
void DES_Dfun(int input[], char key_in[], char output[]) {
int ML[32] = {0}, MR[32] = {0};
int temp1[64], temp2[32], temp3[64];
int Subkey[16][48];
int input_l[32] = {0};
int input_r[32] = {0};
int testi = 0;
for (testi = 0; testi < 32; testi++) {
input_l[testi] = input[testi];
}
for (testi = 0; testi < 32; testi++) {
input_r[testi] = input[32 + testi];
}
BitsCopy(ML, input_l, 32);
BitsCopy(MR, input_r, 32);
BitsCopy(temp1, input, 64);
IP_IPR(temp1, input, IP_Table); //IP置换
printf("IP初始置换:\n");
ShowArray(input, 64);
CharToBit(key_in, temp3, 64);
subKey_fun(temp3, Subkey); //子秘钥的生成
for (int i = 0; i < 16; i++) // 迭代16次
{
printf("***第%d轮迭代:***\n", i + 1);
BitsCopy(temp2, MR, 32); // 临时存储
F_func(MR, Subkey[i]); // F函数变换
Xor(MR, ML, 32); // 得到Ri
BitsCopy(ML, temp2, 32); // 得到Li
printf("ML:\n");
ShowArray(ML, 32);
printf("MR:\n");
ShowArray(MR, 32);
}
IP_IPR(input, temp1, IPR_Table);
BitToHex(output, input, 64);
}
//输出字符数组
void ShowArray(int *array, int num) {
int i;
for (i = 0; i < num; i++) {
printf("%d", array[i]);
}
printf("\n");
}
int main() {
int i = 0;
char MyKey[9] = {1, 1, 1, 1, 1, 1, 1, 1, 0}; // 初始密钥 8字节*8
char MyMessage[9] = {1, 2, 3, 4, 5, 6, 7, 8, 0}; // 初始明文
int KeyBin[64] = {0}, MesBin[64] = {0};
char ciphertext[9];
/*-----------------------------------------------*/
// 密钥
CharToBit(MyMessage, MesBin, 64);
DES_Dfun(MesBin, MyKey, ciphertext);
printf("明文已被加密!\n"); // 信息已加密
for (i = 0; i < 16; i++) {
printf("%c ", ciphertext[i]);
}
printf("\n");
system("pause");
return 0;
/*------------------------------------------------*/
}
逆向中,我们可以根据S盒在so层的特征判断
例如:
14就是:0xE 0 0 0
4就是:4 0 0 0
13就是:0xD 0 0 0