DES算法源代码
DES加密算法代码
DES加密算法代码```pythonimport base64from Crypto.Cipher import DESdef pad(text):while len(text) % 8 != 0:text += ' 'return textdef encrypt(key, text):des = DES.new(key, DES.MODE_ECB)padded_text = pad(text)encrypted_text = des.encrypt(padded_text.encode() return base64.b64encode(encrypted_text).decodedef decrypt(key, encrypted_text):des = DES.new(key, DES.MODE_ECB)decrypted_text =des.decrypt(base64.b64decode(encrypted_text)).decode return decrypted_text.rstripif __name__ == '__main__':key = b'secretkey' # 8字节密钥plaintext = 'Hello, World!'encrypted_text = encrypt(key, plaintext)print('Encrypted text:', encrypted_text)decrypted_text = decrypt(key, encrypted_text)print('Decrypted text:', decrypted_text)```在上述代码中，我们首先导入了`base64`和`Crypto.Cipher`模块，用于进行编码和DES加密操作。
然后定义了两个辅助函数：`pad`用于填充文本，保证其长度能够被8整除；`encrypt`用于进行DES加密操作；`decrypt`用于进行DES解密操作。
DES子密钥生成算法DES加密算法源代码
DES子密钥生成算法DES加密算法源代码下面是一个Java实现的DES密钥生成算法和DES加密算法的源代码示例：```import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import java.security.NoSuchAlgorithmException;import java.security.SecureRandom;import java.util.Base64;public class DESExamplepublic static void main(String[] args)try//生成DES密钥SecretKey secretKey = generateDESKey(;System.out.println("生成的DES密钥：" +Base64.getEncoder(.encodeToString(secretKey.getEncoded());//加密String plainText = "Hello, World!";byte[] encryptedText = encrypt(plainText, secretKey);System.out.println("加密后的数据：" +Base64.getEncoder(.encodeToString(encryptedText));//解密byte[] decryptedText = decrypt(encryptedText, secretKey);System.out.println("解密后的数据：" + newString(decryptedText));} catch (Exception e)e.printStackTrace(;}}//生成DES密钥public static SecretKey generateDESKey( throws NoSuchAlgorithmExceptionKeyGenerator keyGenerator = KeyGenerator.getInstance("DES");SecureRandom secureRandom = new SecureRandom(;keyGenerator.init(secureRandom);return keyGenerator.generateKey(;}//加密数据public static byte[] encrypt(String plainText, SecretKey secretKey) throws ExceptionCipher cipher = Cipher.getInstance("DES");cipher.init(Cipher.ENCRYPT_MODE, secretKey);return cipher.doFinal(plainText.getBytes();}//解密数据public static byte[] decrypt(byte[] cipherText, SecretKey secretKey) throws ExceptionCipher cipher = Cipher.getInstance("DES");cipher.init(Cipher.DECRYPT_MODE, secretKey);return cipher.doFinal(cipherText);}```该代码中使用了Java的标准库javax.crypto来实现DES密钥生成和DES加密解密操作。
DES算法的C语言实现
DES算法的C语⾔实现利⽤C语⾔实现DES算法，分组密码原理过程很简单，但是在写的过程中检查了好久才发现错误原因，主要有两点：1.在加密过程16轮迭代过程中，最后⼀轮迭代运算后的结果并没有进⾏交换，即C=IP-1（R16，L16），这样做的⽬的是为了加密解密使⽤同⼀个算法2.在S盒的过程中，移位后应该加括号，否则+的优先级⾼于<<,会出错，下⾯是算法源码：1 #include "des.h"2 #include <stdio.h>3 #include <stdlib.h>45const unsigned char IP_table[64] = {658, 50, 42, 34, 26, 18, 10, 2,760, 52, 44, 36, 28, 20, 12, 4,862, 54, 46, 38, 30, 22, 14, 6,964, 56, 48, 40, 32, 24, 16, 8,1057, 49, 41, 33, 25, 17, 9, 1,1159, 51, 43, 35, 27, 19, 11, 3,1261, 53, 45, 37, 29, 21, 13, 5,1363, 55, 47, 39, 31, 23, 15, 714 };1516const unsigned char IPR_table[64] = {1740, 8, 48, 16, 56, 24, 64, 32,1839, 7, 47, 15, 55, 23, 63, 31,1938, 6, 46, 14, 54, 22, 62, 30,2037, 5, 45, 13, 53, 21, 61, 29,2136, 4, 44, 12, 52, 20, 60, 28,2235, 3, 43, 11, 51, 19, 59, 27,2334, 2, 42, 10, 50, 18, 58, 26,2433, 1, 41, 9, 49, 17, 57, 2525 };2627const unsigned char E_table[48] = {2832, 1, 2, 3, 4, 5,294, 5, 6, 7, 8, 9,308, 9, 10, 11, 12, 13,3112, 13, 14, 15, 16, 17,3216, 17, 18, 19, 20, 21,3320, 21, 22, 23, 24, 25,3424, 25, 26, 27, 28, 29,3528, 29, 30, 31, 32, 136 };3738const unsigned char P_table[32] = {3916, 7, 20, 21, 29, 12, 28, 17,401, 15, 23, 26, 5, 18, 31, 10,412, 8, 24, 14, 32, 27, 3, 9,4219, 13, 30, 6, 22, 11, 4, 2543 };4445const unsigned char PC1_table[56] = {4657, 49, 41, 33, 25, 17, 9,471, 58, 50, 42, 34, 26, 18,4810, 2, 59, 51, 43, 35, 27,4919, 11, 3, 60, 52, 44, 36,5063, 55, 47, 39, 31, 23, 15,517, 62, 54, 46, 38, 30, 22,5214, 6, 61, 53, 45, 37, 29,5321, 13, 5, 28, 20, 12, 454 };5556const unsigned char LOOP_table[16] = {571, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 158 };5960const unsigned char PC2_table[48] = {6114, 17, 11, 24, 1, 5,623, 28, 15, 6, 21, 10,6323, 19, 12, 4, 26, 8,6416, 7, 27, 20, 13, 2,6541, 52, 31, 37, 47, 55,6630, 40, 51, 45, 33, 48,6744, 49, 39, 56, 34, 53,6846, 42, 50, 36, 29, 3269 };7071const unsigned char sbox[8][4][16] = {72// S17314, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,740, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,754, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,7615, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,77//S27815, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,793, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,800, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,8113, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,82//S38310, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,8413, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,8513, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,861, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,87//S4887, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,8913, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,9010, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,913, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,92//S5932, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,9414, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,954, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,9611, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,97//S69812, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,9910, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,1009, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,1014, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,102//S71034, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,10413, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,1051, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,1066, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,107//S810813, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,1091, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,1107, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,1112, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11112 };113114void ByteToBit(unsigned char* out, const unsigned char* in, const int bits){115for(int i=0;i<bits;i++)116out[i]=(in[i/8]>>(7-i%8))&1;117 }118119void BitToByte(unsigned char* out, const unsigned char* in, const int bits){120 memset(out, 0, (bits + 7) / 8);121for(int i=0;i<bits;i++)122out[i/8]|=in[i]<<(7-i%8);123 }124125void Transform(unsigned char* out,const unsigned char* in, const unsigned char* table, const int len){ 126 unsigned char tmp[64] = {0};127for (int i = 0; i < len; i++)128 tmp[i] = in[table[i] - 1];129 memcpy(out, tmp, len);130 }131132void RotateL(unsigned char* in, const int len, int loop){133static unsigned char tmp[64];134 memcpy(tmp, in, len);135 memcpy(in, in + loop, len - loop);136 memcpy(in + len - loop, tmp, loop);137 }138139static unsigned char subKey[16][48] = { 0 };140void setKey(const unsigned char* in){141char key[64] = { 0 };142 ByteToBit(key, in, 64);143char temp[56]={0};144 Transform(temp, key, PC1_table, 56);145for(int i=0;i<16;i++){146 RotateL(temp, 28, LOOP_table[i]);147 RotateL(temp + 28, 28, LOOP_table[i]);148 Transform(subKey[i], temp, PC2_table, 48);149 }150 }151152void xor(unsigned char* in1,const unsigned char* in2,int len){153for(int i=0;i<len;i++)154 in1[i]^=in2[i];155 }156157void sbox_exchange(unsigned char* out,const unsigned char* in){158char row, column;159for (int i = 0; i < 8; i++){160char num = 0;161 row = (in[6 * i]<<1)+ in[6 * i + 5];162 column = (in[6 * i + 1] << 3) + (in[6 * i + 2] << 2) + (in[6 * i + 3] << 1) + in[6 * i + 4]; 163 num = sbox[i][row][column];164for (int j = 0; j < 4; j++)165 {166out[4 * i + j] = (num >> (3 - j)) & 1;167 }168 }169 }170171void F_func(unsigned char* out,const unsigned char* in,unsigned char* subKey){172 unsigned char temp[48]={0};173 unsigned char res[32]={0};174 Transform(temp, in, E_table, 48);175 xor(temp,subKey,48);176 sbox_exchange(res,temp);177 Transform(out, res, P_table, 32);178 }179180void encryptDES(unsigned char* out,const unsigned char* in, const unsigned char* key){ 181 unsigned char input[64] = { 0 };182 unsigned char output[64] = { 0 };183 unsigned char tmp[64] = { 0 };184 ByteToBit(input, in, 64);185 Transform(tmp, input, IP_table, 64);186char* Li = &tmp[0], *Ri = &tmp[32];187 setKey(key);188for(int i=0;i<16;i++){189char temp[32]={0};190 memcpy(temp,Ri,32);191 F_func(Ri, Ri,subKey[i]);192 xor(Ri, Li, 32);193 memcpy(Li,temp,32);194 }195 RotateL(tmp, 64, 32);//the input is LR,output is RL196 Transform(output, tmp, IPR_table, 64);197 BitToByte(out, output,64);198 }199200void decryptDES(unsigned char* out,const unsigned char* in, const unsigned char* key){ 201 unsigned char input[64] = { 0 };202 unsigned char output[64] = { 0 };203 unsigned char tmp[64] = { 0 };204 ByteToBit(input, in, 64);205 Transform(tmp, input, IP_table, 64);206char* Li = &tmp[0], *Ri = &tmp[32];207 setKey(key);208 RotateL(tmp, 64, 32);209for (int i = 0; i < 16; i++){210char temp[32] = { 0 };211 memcpy(temp, Li, 32);212 F_func(Li, Li,subKey[15 - i]);213 xor(Li, Ri, 32);214 memcpy(Ri, temp, 32);215 }216 Transform(output, tmp, IPR_table, 64);217 BitToByte(out, output, 64);218 }。
DES加解密算法C语言源代码
DES加解密算法C语言源代码以下是一个实现DES加解密算法的C语言源代码，包含了加密和解密函数。
请注意，这个代码只是为了演示DES算法的工作原理，并不是一个完整的、安全的加密算法实现。
```c#include <stdio.h>#include <stdint.h>typedef structuint8_t key[8];uint8_t subkeys[16][6];} DESKey;void generateSubkeys(uint8_t* key, uint8_t subkeys[16][6]) //略过子密钥生成算法的具体实现//这里只是假设生成的子密钥都是随机的，实际生成过程要更复杂for (int i = 0; i < 16; i++)for (int j = 0; j < 6; j++)subkeys[i][j] = (i+j) % 256;}}void DES(uint8_t* input, uint8_t key[8], uint8_t* output, int encrypt)//略过DES加密算法的具体实现DESKey desKey;for (int i = 0; i < 8; i++)desKey.key[i] = key[i];}generateSubkeys(key, desKey.subkeys);//这里只是假设输入输出是8字节长，实际上可以支持任意长度//执行加解密操作if (encrypt)printf("Encrypting: ");} elseprintf("Decrypting: ");}for (int i = 0; i < 8; i++)output[i] = encrypt ? input[i] ^ desKey.subkeys[0][i%6] : input[i] ^ desKey.subkeys[15][i%6];printf("%02X ", output[i]);}printf("\n");int maiuint8_t input[8] = {0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xF0};uint8_t key[8] = {0xA1, 0xB2, 0xC3, 0xD4, 0xE5, 0xF6, 0x07,0x08};uint8_t output[8];DES(input, key, output, 1);DES(output, key, output, 0);return 0;```在这个代码中，`generateSubkeys` 函数用于生成 16 个子密钥，之后分别在加密和解密函数 `DES` 中使用。
DES算法用C++实现的源代码
DES算法用C++实现的源代码用C++实现的源代码#include "memory.h"#include "stdio.h"enum {encrypt,decrypt};//ENCRYPT:加密，DECRYPT：解密void des_run(char out[8],char in[8],bool type=encrypt);//设置密钥void des_setkey(const char key[8]);static void f_func(bool in[32],const bool ki[48]);//f函数static void s_func(bool out[32],const bool in[48]);//s盒代替//变换static void transform(bool *out, bool *in, const char *table, int len);static void xor(bool *ina, const bool *inb, int len);//异或static void rotatel(bool *in, int len, int loop);//循环左移//字节组转换成位组static void bytetobit(bool *out,const char *in, int bits);//位组转换成字节组static void bittobyte(char *out, const bool *in, int bits);//置换IP表conststatic charip_table[64]={58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,1 4,6,64,56,48,40,32,24,16,8,57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,4 5,37,29,21,13,5,63,55,47,39,31,23,15,7};//逆置换IP-1表const static charipr_table[64]={40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,6 2,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11, 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static const char e_table[48]={32,1, 2, 3, 4, 5,4, 5, 6, 7, 8, 9,8, 9,10,11,12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,2 8,29,28,29,30,31,32,1};//P换位表const static charp_table[32]={16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,2,8,24,14,32,27,3,9,1 9,13,30,6,22,11,4,25};//pc1选位表const static char 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, 39,31,23,15,7,62,54,46,3 8,30,22,14,6,61,53,45,37 ,29,21,13,5,28,20,12,4 };//pc2选位表const static char pc2_table[48]={14,17,11, 24,1,5,3,28,15,6,21, 10,23,19,12,4,26,8,16 ,7,27,20,13,2,41,52,3 1,37,47,55,30,40,51,45,33 ,48,44,49,39,56,34,53,46 ,42,50,36,29,32};//左移位数表const static char loop_table[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};//S盒const static char s_box[8][4][16]={//s114, 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,//s215, 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,//s310, 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,//s47, 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,//s52, 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,//s612, 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,//s74, 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,//s813, 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 };static bool subkey[16][48];//16圈子密钥void des_run(char out[8],char in[8], bool type){static bool m[64],tmp[32],*li=&m[0], *ri=&m[32];bytetobit(m,in,64);transform(m,m,ip_table,64);if(type==encrypt){for(int i=0;i<16;i++){memcpy(tmp,ri,32);f_func(ri,subkey[i]);xor(ri,li,32);memcpy(li,tmp,32);}}else{for(int i=15;i>=0;i--){memcpy(tmp,li,32);f_func(li,subkey[i]);xor(li,ri,32);memcpy(ri,tmp,32);}}transform(m,m,ipr_table,64);bittobyte(out,m,64);}void des_setkey(const char key[8]){static bool k[64], *kl=&k[0], *kr=&k[28];bytetobit(k,key,64);transform(k,k,pc1_table,56);for(int i=0;i<16;i++){rotatel(kl,28,loop_table[i]);rotatel(kr,28,loop_table[i]);transform(subkey[i],k,pc2_table,48);}}void f_func(bool in[32],const bool ki[48]){static bool mr[48];transform(mr,in,e_table,48);xor(mr,ki,48);s_func(in,mr);transform(in,in,p_table,32);}void s_func(bool out[32],const bool in[48]){for(char i=0,j,k;i<8;i++,in+=6,out+=4){j=(in[0]<<1)+in[5];k=(in[1]<<3)+(in[2]<<2)+(in[3]<<1)+in[4];bytetobit(out,&s_box[i][j][k],4);}}void transform(bool *out,bool *in,const char *table,int len){static bool tmp[256];for(int i=0;i<len;i++)tmp[i]=in[table[i]-1];memcpy(out,tmp,len);}void xor(bool *ina,const bool *inb,int len){for(int i=0;i<len;i++)ina[i]^=inb[i];}void rotatel(bool *in,int len,int loop){static bool tmp[256];memcpy(tmp,in,loop);memcpy(in,in+loop,len-loop);memcpy(in+len-loop,tmp,loop);}void bytetobit(bool *out,const char *in,int bits){for(int i=0;i<bits;i++)out[i]=(in[i/8]>>(i%8)) &1;}void bittobyte(char *out,const bool *in,int bits){memset(out,0,(bits+7)/8);for(int i=0;i<bits;i++)out[i/8]|=in[i]<<(i%8);}void main(){char key[8]={'p','r','o','g','r','a','m'},str[8];puts("*****************DES***********************");printf("\n");printf("\n");puts("please input your words");gets(str);printf("\n");puts("****************************************");des_setkey(key);des_run(str,str,encrypt);puts("after encrypting:");puts(str);printf("\n");puts("****************************************");puts("after decrypting:");des_run(str,str,decrypt);puts(str);printf("\n");puts("****************************************");printf("\n");}。
DES算法实现
DES算法实现：java语言下可以导入org.apache前缀的类库，apache组织给出了org.apache.codec类库，将基本的加密和解密方法打包成现成方法，并且提供了DES算法必备的S盒。
所以这个实现方法会采用org.apache.codec类库，采用结合源代码的方式进行编写。
工程名为ZDESAl即DES Algorithm,下面包含两个类，DESCoder负责生成密钥，DESCoderTest负责进行密钥的左移、置换选择，扩充等操作。
下面给出DESCoder类的设计思路和源代码：import java.security.Key;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import javax.crypto.SecretKey;import javax.crypto.SecretKeyFactory;import javax.crypto.spec.DESKeySpec;/***DES安全编码组件*@author Hawke7*@version 1.0*/public abstract class DESCoder {/***密钥算法<br>*Java6只支持56位密钥<br>*Bouncy Castle支持64位密钥*/public static final String KEY_ALGORITHM = "DES";/***加密/解密算法/工作模式/填充方式*/public static final String CIPHER_ALGORITHM= "DES/ECB/PKCS5Padding";/***转换密钥*@param key二进制密钥*@return key二进制密钥*@throws Exception*/private static Key toKey(byte[] key) throws Exception {// 实例化DES密钥材料DESKeySpec dks = new DESKeySpec(key);// 实例化秘密密钥工厂SecretKeyFactory keyFactory =SecretKeyFactory.getInstance(KEY_ALGORITHM);// 生成私密密钥SecretKey secretKey = keyFactory.generateSecret(dks);return secretKey;}/***解密*@param data待解密数据*@param key密钥*@return byte[]解密数据*@throws Exception*/public static byte[] decrypt(byte[] data, byte[] key) throws Exception {// 还原密钥Key k = toKey(key);// 实例化Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);// 初始化，设置为解密模式cipher.init(Cipher.DECRYPT_MODE, k);// 执行操作return cipher.doFinal(data);}/***加密*@param data待加密数据*@param key密钥*@return byte[]加密数据*@throws Exception*/public static byte[] encrypt(byte[] data, byte[] key) throws Exception {// 还原密钥Key k = toKey(key);// 实例化Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);// 初始化，设置为解密模式cipher.init(Cipher.ENCRYPT_MODE, k);// 执行操作return cipher.doFinal(data);}/***生成密钥<br>*Java6只支持56位密钥<br>*Bouncy Castle支持64位密钥<br>*@return byte[]二进制密钥*@throws Exception*/public static byte[] initKey() throws Exception {/** 实例化密钥生成器* 若要使用64位密钥注意替换* 将下述代码中的* KeyGenerator.getInstance(CIPHER_ALGORITHM);* 替换为* KeyGenerator.getInstance(CIPHER_ALGORITHM, "BC");*/KeyGenerator kg = KeyGenerator.getInstance(KEY_ALGORITHM);/** 初始化密钥生成器* 若要使用64位密钥注意替换* 将下面代码kg.init(56)* 替换为kg.init(64)*/kg.init(56);// 生成私密密钥SecretKey secretKey = kg.generateKey();// 获得密钥的二进制编码形式return secretKey.getEncoded();}}首先DESCoder要定义成抽象类，因为其中全部是static静态方法toKey,toKey初始化密钥材料，并且实例化密钥工厂，因为DES算法要进行16轮迭代，所以工厂每一次都要给出不同的密钥，从而增强雪崩效应。
des加密算法c语言源代码
#include<iostream.h>int IP[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};int IP_1[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};int E[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};int P[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 };void Char_to_Int(unsigned char in[],int out[],int len){for(int i=0;i<len;i++)out[i]=int(in[i]);}void Int_to_Char(int in[],unsigned char out[],int len){for(int i=0;i<len;i++)out[i]=char(in[i]);}void B_to_H(int in[],unsigned char out[]){for(int i=0;i<16;i++){int temp=in[i*4]*8+in[i*4+1]*4+in[i*4+2]*2+in[i*4+3];switch(temp){case 10 :out[i]='A';break;case 11 :out[i]='B';break;case 12 :out[i]='C';break;case 13 :out[i]='D';break;case 14 :out[i]='E';break;case 15 :out[i]='F';break;default :out[i]=unsigned char(temp+48);break;}}}void H_to_B(unsigned char in[],int out[]){for(int i=0;i<16;i++)switch(in[i]){case 'A':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=0;break;case 'B':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=1;break;case 'C':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=0;break;case 'D':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=1;break;case 'E':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=0;break;case 'F':out[i*4]=1;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=1;break;case '0':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=0;break;case '1':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=1;break;case '2':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=0;break;case '3':out[i*4]=0;out[i*4+1]=0;out[i*4+2]=1;out[i*4+3]=1;break;case '4':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=0;break;case '5':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=0;out[i*4+3]=1;break;case '6':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=0;break;case '7':out[i*4]=0;out[i*4+1]=1;out[i*4+2]=1;out[i*4+3]=1;break;case '8':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=0;break;case '9':out[i*4]=1;out[i*4+1]=0;out[i*4+2]=0;out[i*4+3]=1;break;}}void O_to_B(int in[],int out[],int len){int i,j;for(i=0;i<len;i++)for(j=i*len+7;j>=i*len;j--){out[j]=in[i]%2; in[i]=in[i]/2;}}void B_to_O(int in[],int out[],int len){int j;for(int i=0;i<len;i++){j=8*i;out[i]=in[j]*128+in[j+1]*64+in[j+2]*32+in[j+3]*16+in[j+4]*8+in[j+5]*4+in[j+6]*2+in[j+7]*1;}}void Convert(int in[],int out[],int table[],int len){for(int i=0;i<len;i++)out[i]=in[table[i]-1];}void Divide(int in[],int out1[],int out2[],int len){for(int i=0;i<len;i++)if(i<len/2)out1[i]=in[i];elseout2[i-len/2]=in[i];}//正确void Combine(int in1[],int in2[],int out[],int len){for(int i=0;i<len;i++)if(i<len/2)out[i]=in1[i];elseout[i]=in2[i-len/2];}//正确void RLC1(int in[],int out[],int len){int temp=in[0];for(int i=0;i<len-1;i++)out[i]=in[i+1];out[len-1]=temp;}//正确void RLC2(int in[],int out[],int len){int temp1=in[0],temp2=in[1];for(int i=0;i<len-2;i++)out[i]=in[i+2];out[len-2]=temp1;out[len-1]=temp2;}//正确void COPY(int in[],int out[],int len){for(int i=0;i<len;i++)out[i]=in[i];}//ZHENGQUEvoid XOR(int in1[],int in2[],int out[],int len){for(int i=0;i<len;i++)out[i]=(in1[i]+in2[i])%2;}void GetKey(unsigned char in[],int out[16][48]){int i;int Msg_Int[8],Msg_Bin[64],Msg_Bin_PC1[56],Key_Bin[56],C[17][28],D[17][28];char Msg_H[16];int PC1[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[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};Char_to_Int(in,Msg_Int,8);//正确O_to_B(Msg_Int,Msg_Bin,8);//正确cout<<endl;Convert(Msg_Bin,Msg_Bin_PC1,PC1,56); Divide(Msg_Bin_PC1,C[0],D[0],56);for(i=0;i<16;i++){if(i==0){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else if(i==1){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else if(i==8){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else if(i==15){RLC1(C[i],C[i+1],28);RLC1(D[i],D[i+1],28);}else{RLC2(C[i],C[i+1],28);RLC2(D[i],D[i+1],28);}Combine(C[i+1],D[i+1],Key_Bin,56);Convert(Key_Bin,out[i],PC2,48);}} //生成子密钥正确void S_box(int in[],int out[]){int i;int SBox[8][64] ={{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},{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},{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},{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},{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,},{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},{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},{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}};int s1,s3,s2[8];for(i=0;i<8;i++){s1=in[i*6]*2+in[i*6+5]*1;s3=in[i*6+1]*8+in[i*6+2]*4+in[i*6+3]*2+in[i*6+4]*1;s2[i]=SBox[i][s1*16+s3];}int j;for(i=0;i<8;i++)for(j=i*4+3;j>=i*4;j--){out[j]=s2[i]%2; s2[i]=s2[i]/2;}}void Encode(unsigned char in[],unsigned char Final_H[],int K[16][48]){int i;intORINT[8],ORBYTE[64],FinalBYTE[64],LR[64],R48[48],S_in[48],S_out[32],F_RL[32],FinalINT[8],L[17] [32],R[17][32];char ORH[16];Char_to_Int(in,ORINT,8);cout<<""<<endl;O_to_B(ORINT,ORBYTE,8);Convert(ORBYTE,LR,IP,64);Divide(LR,L[0],R[0],64);for(i=1;i<17;i++){Convert(R[i-1],R48,E,48);XOR(R48,K[i-1],S_in,48);S_box(S_in,S_out);Convert(S_out,F_RL,P,32);XOR(F_RL,L[i-1],R[i],32);COPY(R[i-1],L[i],32);}Combine(R[16],L[16],LR,64);Convert(LR,FinalBYTE,IP_1,64);cout<<"二进制的密文:"<<endl;for(i=0;i<64;i++){cout<<FinalBYTE[i];}cout<<endl<<endl;B_to_H(FinalBYTE,Final_H);}void DeCode(unsigned char in[],unsigned char Final_H[],int K[16][48]){int i;intORINT[8],ORBYTE[64],LR[64],R48[48],S_in[48],S_out[32],F_RL[32],FinalBYTE[64],FinalINT[8],L[17] [32],R[17][32];char ORH[16];Char_to_Int(in,ORINT,8);cout<<""<<endl;O_to_B(ORINT,ORBYTE,8);Convert(ORBYTE,LR,IP,64);Divide(LR,L[0],R[0],64);for(i=1;i<17;i++){COPY(R[i-1],L[i],32);Convert(R[i-1],R48,E,48);XOR(R48,K[16-i],S_in,48);S_box(S_in,S_out);Convert(S_out,F_RL,P,32);XOR(L[i-1],F_RL,R[i],32);}Combine(R[16],L[16],LR,64);Convert(LR,FinalBYTE,IP_1,64);B_to_H(FinalBYTE,Final_H);}void main(){int i;unsigned char Msg[8],UnCodeMsg[16],CodeMsg[16],Key[8],Msg_H[16],CodeChar[8];int SKey[16][48];int OrByte[64],OrInt[8],FinalByte[64],FinalInt[8];cout<<"请输入明文："<<endl;for(i=0;i<8;i++)cin>>Msg[i];cout<<"请输入初始密钥："<<endl;for(i=0;i<8;i++)cin>>Key[i];GetKey(Key,SKey);Encode(Msg,CodeMsg,SKey);cout<<"十六进制的密文："<<endl;for(i=0;i<16;i++)cout<<CodeMsg[i];cout<<endl;cout<<"字符型密文："<<endl;H_to_B(CodeMsg,FinalByte);B_to_O(FinalByte,FinalInt,8);Int_to_Char(FinalInt,CodeChar,8);for(i=0;i<8;i++)cout<<CodeChar[i];cout<<endl;cout<<"请输入十六进制的密文："<<endl;for(i=0;i<16;i++)cin>>CodeMsg[i];B_to_O(FinalByte,FinalInt,8);Int_to_Char(FinalInt,CodeChar,8);cout<<"请输入解密密钥："<<endl;for(i=0;i<8;i++)cin>>Key[i];GetKey(Key,SKey);DeCode(CodeChar,Msg_H,SKey);//for(i=0;i<16;i++)// cout<<Msg_H[i];cout<<endl;H_to_B(Msg_H,OrByte);B_to_O(OrByte,OrInt,8);Int_to_Char(OrInt,Msg,8);cout<<"明文是："<<endl;for(i=0;i<8;i++)cout<<Msg[i];cout<<endl;}。
des密码算法程序c语言
des密码算法程序c语言一、概述DES（数据加密标准）是一种常用的对称加密算法，它采用64位的密钥，对数据进行加密和解密。
本程序使用C语言实现DES算法，包括密钥生成、数据加密和解密等操作。
二、算法实现1.密钥生成：使用初始置换算法IP(56位)将明文转化为56位的分组，再将该分组经过一系列的逻辑函数F进行6轮处理，最终生成一个56位的密文。
其中密钥包括56位数据位和8位奇偶校验位。
2.数据加密：将需要加密的数据转化为56位的分组，再经过DES 算法处理，得到密文。
3.数据解密：将密文经过DES算法处理，还原成原始明文。
三、程序代码```c#include<stdio.h>#include<string.h>#include<stdlib.h>#include<time.h>//DES算法参数定义#defineITERATIONS6//加密轮数#defineKEY_LENGTH8//密钥长度，单位为字节#defineBLOCK_SIZE8//数据分组长度，单位为字节#definePADDINGPKCS7Padding//填充方式#defineMAX_INPUT_LENGTH(BLOCK_SIZE*2)//数据输入的最大长度//初始置换函数voidinit_permutation(unsignedcharinput[BLOCK_SIZE]){inti;for(i=0;i<BLOCK_SIZE;i++){input[i]=i;}}//逻辑函数F的定义voidlogic_function(unsignedcharinput[BLOCK_SIZE],unsigned charoutput[BLOCK_SIZE]){inti;for(i=0;i<BLOCK_SIZE;i++){output[i]=input[(i+1)%BLOCK_SIZE]^input[i]^(i+1)/BLOCK_SI ZE;}}//DES算法主函数voiddes_encrypt(unsignedchar*input,unsignedchar*output){ unsignedcharkey[KEY_LENGTH];//密钥数组unsignedchariv[BLOCK_SIZE];//初始置换的输入数组unsignedcharciphertext[MAX_INPUT_LENGTH];//密文数组unsignedcharpadding[BLOCK_SIZE];//填充数组unsignedintlength=strlen((char*)input);//数据长度（以字节为单位）unsignedintpadding_length=(length+BLOCK_SIZE-1)%BLOCK_SIZE;//需要填充的字节数unsignedintround=0;//加密轮数计数器unsignedintj=0;//数据指针，用于循环读取数据和填充数据intkey_offset=((1<<(32-KEY_LENGTH))-1)<<(32-(ITERATIONS*BLOCK_SIZE));//密钥索引值，用于生成密钥数组和填充数组的初始值unsignedintk=0;//DES算法中每个轮次的密钥索引值，用于生成每个轮次的密钥数组和填充数组的值unsignedintkplus1=(k+1)%((1<<(32-BLOCK_SIZE))-1);//DES算法中每个轮次的密钥索引值加一后的值，用于下一个轮次的密钥生成charseed[32];//使用MD5作为初始种子值生成随机数序列chartmp[MAX_INPUT_LENGTH];//临时变量数组，用于数据交换和中间计算结果存储等操作time_tt;//时间戳变量，用于生成随机数序列的种子值srand((unsignedint)time(&t));//设置随机数种子值，确保每次运行生成的随机数序列不同init_permutation(iv);//初始置换操作，将输入数据转化为56位分组（需要重复填充时）或一个随机的分组（不需要重复填充时）memcpy(key,key_offset,sizeof(key));//将初始化的密钥数组复制到相应的位置上，以便于接下来的轮次生成不同的密钥值memcpy(padding,seed,sizeof(seed));//将种子值复制到填充数组中，以便于接下来的轮次生成不同的随机数序列值for(round=0;round<ITERATIONS;round++){//进行加密轮次操作，每轮包括。
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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,
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
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
};
int S2[4][16]={
15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
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 };
46, 42, 50, 36, 29, 32 };
int S1[4][16]={ //S换位表
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,
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
};
int E[48]={ //扩展换位表
32, 1, 2, 3, 4, 5,
int RKS[8]; //存放经过查找8个S表后得到的8个十进制结果
int SP[32]; //将RKS表中的十进制数化成二进制
int RKSP[32]; //存放SP表经过P盒换位后的结果
int text_end[64]; //存放经过左右32位换位后的结果
int text_out[14][64]; //存放初始化向量和所有经过DES的分组的二进制
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4 };
int move[16]={ //循环移位表
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
int PC2[48]={ //PC2换位表（56—>48）
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12
};
int S3[4][16]={
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,
char init[9]={"HTmadeit"}; //设置初始化向量为“HTmadeit”
int CBC[64];
int result[13][64];
int H[208];
char Miint M[13][8];
char choice;
int t;
int i,j;
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,
int text_ip[64]; //存放第一次初始换位的结果
int L0[32],Li[32]; //将64位分成左右各32位进行迭代
int R0[32],Ri[32];
int RE0[48]; //存放右半部分经过E表扩展换位后的48位数据
int key[64]; //存放密钥的二进制形式
int keyPC1[56]; //存放密钥key经过PC1换位表后变成的56位二进制
int A[28]; //将keyPC1分成左右两部分，左部A，右部B，各28位，以便进行循环左移
int B[28];
int keyAB[56]; //将循环左移后两部分的结果合并起来
int K[16][48]; //存放16次循环左移产生的子密钥
int RK[48]; //存放RE和K异或运算后的结果
#include<stdio.h>
#include<string.h>
void main()
{ //声明变量
char MingWen[104]; //存放原始的明文
char target[8]; //将明文断成8个字符的一个分组
char InputKey[8]; //存放字符型的八位密钥
int text[64]; //存放一个分组转成二进制后的数据
int k,l,m,n;
int r[8],c[8];
int flag=1;
int IP[64]={ //初始换位表
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,