DES算法加密解密C++源代码
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算法标准代码
des算法标准代码一、概述DES（数据加密标准）是一种常用的对称加密算法，它使用64位的密钥对数据进行加密和解密。
本标准代码文档旨在提供DES算法的完整实现，以便读者了解其工作原理和实现细节。
二、算法描述1. 密钥生成：DES算法使用一个56位的密钥，通过一系列复杂的算法将其转换为64位的数据。
2. 加密过程：加密过程包括三个步骤：初始置换、分组和迭代。
在迭代过程中，每个分组被替换为新的分组，并使用密钥进行置换和移位操作。
3. 解密过程：解密过程与加密过程类似，但使用与加密时相反的置换和移位操作。
三、代码实现以下是一个简单的Python实现示例：```pythonfrom Crypto.Cipher import DESfrom Crypto.Util.Padding import pad, unpadfrom binascii import hexlify, unhexlifyimport random# 密钥生成函数def generate_key(bit_length=8):key = [0]*64for i in range(bit_length//8):random.shuffle(key[:8]) # 使用随机数填充8字节密钥的一部分 if i != bit_length//8-1: # 最后一位用校验位替代，所以不算进bit_length长度中random.shuffle(key[8:]) # 对剩余字节打乱顺序，以保护剩余部分的秘密性return key.tolist() # 转换为列表便于序列化处理# DES加密/解密函数def des_encrypt(data, key):des = DES.new(key, DES.MODE_ECB) # 使用ECB模式进行加密padded_data = pad(data.encode(), DES.block_size) # 对数据进行填充处理encrypted_data = des.encrypt(padded_data) # 进行加密操作return encrypted_data.hex() # 将加密结果转换为十六进制字符串方便查看def des_decrypt(encrypted_data, key):des = DES.new(key, DES.MODE_ECB) # 使用ECB模式进行解密操作decrypted_data = des.decrypt(unhexlify(encrypted_data)) # 进行解密操作，并将结果解码为原始数据return unpad(decrypted_data).decode() # 将解密结果进行去填充处理，并解码为原始字符串返回```四、使用示例以下是一个简单的使用示例：```python# 生成随机密钥，这里假设使用长度为8字节的密钥，根据实际情况进行修改即可key = generate_key()print("Generated key: {}".format(hexlify(key)))# 要加密的数据（这里使用字符串“Hello World”作为示例）data = "Hello World"print("Original data: {}".format(data))encrypted_data = des_encrypt(data, key) # 对数据进行加密操作，并输出加密结果（十六进制字符串）print("Encrypted {}".format(encrypted_data))decrypted_data = des_decrypt(encrypted_data, key) # 对加密结果进行解密操作，并输出解密结果（原始字符串）print("Decrypted {}".format(decrypted_data))```请注意，这只是一个简单的示例代码，用于演示DES算法的实现和基本用法。
用c语言实现des算法
用c语言实现des算法由于DES算法被广泛应用于加密和数据安全方面，因此在计算机科学领域，了解和实现DES算法是非常重要的。
C语言是一种强大的编程语言，其通用性和高效性使其成为实现DES算法的理想选择。
以下是使用C语言实现DES算法的步骤和方法：1.将明文和密钥转换为二进制格式在DES算法中，明文和密钥必须先转换为二进制格式才能进行加密或解密操作。
可以使用一个字符串数组来存储明文和密钥，然后使用C 语言的位运算符将每个字符转换为二进制格式。
2.对明文进行初始置换DES算法的第一步是对明文进行初始置换。
可以使用一个int型数据来存储初始置换后的结果。
3.密钥生成使用密钥生成算法来生成16个48位的子密钥。
可以使用一个二维数组来存储每个子密钥。
4.将初始置换后的明文分为左右两个部分将初始置换后的明文分为左右两个部分，每个部分32位。
5.进行16轮迭代在每轮迭代中，右半部分32位的明文和48位的子密钥进行异或运算，然后使用S盒置换和P盒置换来处理数据。
最后将结果与左半部分32位的明文异或，以更新下一轮迭代所需的数据。
6.合并左右两个部分在进行最后一轮迭代后，将左右两个部分合并成一段64位的二进制数据。
7.进行最后的逆置换使用逆置换来处理上一步生成的64位二进制数据，以生成最终的密文。
实现DES算法需要一定的数学知识和编程技能，因此建议有一定编程基础的人才尝试实现此算法。
列表：1.使用C语言实现DES算法步骤2.将明文和密钥转换为二进制格式的方法3.对明文进行初始置换的具体过程4.密钥生成算法的原理和实现方法5.如何将初始置换后的明文分为左右两个部分6.DES算法16轮迭代的详细过程7.如何合并左右两个部分的数据8.DES算法中的最后一步逆置换的作用和过程9.DES算法的应用场景和重要性10.如何使用C语言实现DES算法的具体步骤和技巧。
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。
C语言加密与解密算法
C语言加密与解密算法在计算机科学与信息安全领域，加密与解密算法起着至关重要的作用。
加密算法用于将原始数据转换为不可读的密文，而解密算法则用于将密文还原为可读的原始数据。
C语言是一种常用的编程语言，具备高效性和灵活性，适用于加密与解密算法的开发。
本文将介绍几种常用的C语言加密与解密算法。
一、凯撒密码算法凯撒密码算法是一种最简单的替换加密算法，通过将字母按照固定的偏移量进行替换来实现加密与解密。
以下是一个简单的C语言凯撒密码实现例子：```c#include <stdio.h>void caesarEncrypt(char* message, int key) {int i = 0;while (message[i] != '\0') {if (message[i] >= 'a' && message[i] <= 'z') {message[i] = (message[i] - 'a' + key) % 26 + 'a';} else if (message[i] >= 'A' && message[i] <= 'Z') {message[i] = (message[i] - 'A' + key) % 26 + 'A';}i++;}}void caesarDecrypt(char* message, int key) {int i = 0;while (message[i] != '\0') {if (message[i] >= 'a' && message[i] <= 'z') {message[i] = (message[i] - 'a' - key + 26) % 26 + 'a'; } else if (message[i] >= 'A' && message[i] <= 'Z') {message[i] = (message[i] - 'A' - key + 26) % 26 + 'A'; }i++;}}int main() {char message[] = "Hello, World!";int key = 3;printf("Original message: %s\n", message);caesarEncrypt(message, key);printf("Encrypted message: %s\n", message);caesarDecrypt(message, key);printf("Decrypted message: %s\n", message);return 0;}```以上程序演示了凯撒密码的加密与解密过程，通过指定偏移量实现对消息的加密与解密。
des密码算法实验c语言
des密码算法实验c语言以下是一个使用C语言实现DES密码算法的简单实验示例：```c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <openssl/des.h>int main() {// 输入明文char plaintext[8] = "12345678";// 初始化DES密钥DES_cblock key = {0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF};DES_key_schedule keysched;DES_set_key_unchecked(&key, &keysched);// 加密unsigned char ciphertext[8];DES_cblock ivec = {0}; // 初始化向量DES_ncbc_encrypt(plaintext, ciphertext, sizeof(plaintext),&keysched, &ivec, DES_ENCRYPT);// 输出密文printf("Ciphertext: ");for (int i = 0; i < sizeof(plaintext); i++) {printf("%02X", ciphertext[i]);}printf("\n");// 解密unsigned char decryptedtext[8];memset(ivec, 0, sizeof(ivec)); // 重置初始化向量DES_ncbc_encrypt(ciphertext, decryptedtext, sizeof(plaintext), &keysched, &ivec, DES_DECRYPT);// 输出明文printf("Plaintext: ");for (int i = 0; i < sizeof(plaintext); i++) {printf("%c", decryptedtext[i]);}printf("\n");return 0;}```在这个实验中，我们使用了OpenSSL库中的DES函数来实现DES 密码算法。
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加密C语言实现源代码
void *memcpy( void *dest, const void *src, unsigned char count ){// ASSERT((dest != NULL)&&(src != NULL));unsigned char *temp_dest = (unsigned char *)dest;unsigned char *temp_src = (unsigned char *)src;while(count--) // 不对是否存在重叠区域进行判断{*temp_dest++ = *temp_src++;}return dest;}unsigned char *memset(unsigned char *dst,unsigned char value,unsigned char count) {unsigned char *start = dst;while (count--)*dst++ = value;return(start);}// 初始置换表IPunsigned char IP_Table[64] = { 57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7,56,48,40,32,24,16,8,0,58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6};//逆初始置换表IP^-1unsigned char IP_1_Table[64] = {39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25,32,0,40,8,48,16,56,24};//扩充置换表Eunsigned char E_Table[48] = {31, 0, 1, 2, 3, 4,3, 4, 5, 6, 7, 8,7, 8,9,10,11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,21,22,23,24,23,24,25,26,27,28,27,28,29,30,31, 0};//置换函数Punsigned char P_Table[32] = {15,6,19,20,28,11,27,16, 0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24};//S盒unsigned char S[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}}};//置换选择1unsigned char PC_1[56] = {56,48,40,32,24,16,8, 0,57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,60,52,44,36,28,20,12,4,27,19,11,3};//置换选择2unsigned char PC_2[48] = {13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,46,43,48,38,55,33,52,45,41,49,35,28,31};// 对左移次数的规定unsigned char MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; //字节转换成二进制unsigned char ByteToBit(unsigned char ch, unsigned char bit[8]) {unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*(bit+cnt) = (ch>>cnt)&1;}return 0;}// 二进制转换成字节unsigned char BitToByte(unsigned char bit[8],unsigned char *ch){unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*ch |= *(bit + cnt)<<cnt;}return 0;}// 将长度为8的字符串转为二进制位串unsigned char Char8ToBit64(unsigned char ch[8],unsigned char bit[64]){unsigned char cnt;for(cnt = 0; cnt < 8; cnt++){ByteToBit(*(ch+cnt),bit+(cnt<<3));}return 0;}// 将二进制位串转为长度为8的字符串unsigned char Bit64ToChar8(unsigned char bit[64],unsigned char ch[8]){unsigned char cnt;memset(ch,0,8);for(cnt = 0; cnt < 8; cnt++){BitToByte(bit+(cnt<<3),ch+cnt);}return 0;}// 密钥置换1unsigned char DES_PC1_Transform(unsigned char key[64], unsigned char tempbts[56]) {unsigned char cnt;for(cnt = 0; cnt < 56; cnt++){tempbts[cnt] = key[PC_1[cnt]];}return 0;}//密钥置换2unsigned char DES_PC2_Transform(unsigned char key[56], unsigned char tempbts[48]) {unsigned char cnt;for(cnt = 0; cnt < 48; cnt++){tempbts[cnt] = key[PC_2[cnt]];}return 0;}//循环左移unsigned char DES_ROL(unsigned char data[56], unsigned char time){unsigned char temp[56];//保存将要循环移动到右边的位memcpy(temp,data,time);memcpy(temp+time,data+28,time);//前28位移动memcpy(data,data+time,28-time);memcpy(data+28-time,temp,time);//后28位移动memcpy(data+28,data+28+time,28-time);memcpy(data+56-time,temp+time,time);return 0;}//IP置换unsigned char DES_IP_Transform(unsigned char data[64]){unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_Table[cnt]];}memcpy(data,temp,64);return 0;}// IP逆置换unsigned char DES_IP_1_Transform(unsigned char data[64]) {unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_1_Table[cnt]];}memcpy(data,temp,64);return 0;}//扩展置换unsigned char DES_E_Transform(unsigned char data[48]) {unsigned char cnt;unsigned char temp[48];for(cnt = 0; cnt < 48; cnt++){temp[cnt] = data[E_Table[cnt]];}memcpy(data,temp,48);return 0;}//P置换unsigned char DES_P_Transform(unsigned char data[32]) {unsigned char cnt;unsigned char temp[32];for(cnt = 0; cnt < 32; cnt++){temp[cnt] = data[P_Table[cnt]];}memcpy(data,temp,32);return 0;}// 异或unsigned char DES_XOR(unsigned char R[48], unsigned char L[48] ,unsigned char count) {unsigned char cnt;for(cnt = 0; cnt < count; cnt++){R[cnt] ^= L[cnt];}return 0;}// S盒置换unsigned char DES_SBOX(unsigned char data[48]){unsigned char cnt;unsigned char line,row,output;unsigned char cur1,cur2;for(cnt = 0; cnt < 8; cnt++){cur1 = cnt*6;cur2 = cnt<<2;// 计算在S盒中的行与列line = (data[cur1]<<1) + data[cur1+5];row = (data[cur1+1]<<3) + (data[cur1+2]<<2)+ (data[cur1+3]<<1) + data[cur1+4];output = S[cnt][line][row];// 化为2进制data[cur2] = (output&0X08)>>3;data[cur2+1] = (output&0X04)>>2;data[cur2+2] = (output&0X02)>>1;data[cur2+3] = output&0x01;}return 0;}//交换unsigned char DES_Swap(unsigned char left[32], unsigned char right[32]){unsigned char temp[32];memcpy(temp,left,32);memcpy(left,right,32);memcpy(right,temp,32);return 0;}//生成子密钥unsigned char DES_MakeSubKeys(unsigned char key[64],unsigned char subKeys[16][48]) {unsigned char temp[56];unsigned char cnt;DES_PC1_Transform(key,temp);// PC1置换for(cnt = 0; cnt < 16; cnt++) //16轮跌代，产生16个子密钥{DES_ROL(temp,MOVE_TIMES[cnt]);// 循环左移DES_PC2_Transform(temp,subKeys[cnt]);//PC2置换，产生子密钥}return 0;}//加密单个分组unsigned char DES_EncryptBlock(unsigned char plainBlock[8], unsigned char subKeys[16][48], unsigned char cipherBlock[8]){unsigned char plainBits[64];unsigned char copyRight[48];unsigned char cnt;Char8ToBit64(plainBlock,plainBits);//初始置换（IP置换）DES_IP_Transform(plainBits);// 16轮迭代for(cnt = 0; cnt < 16; cnt++){memcpy(copyRight,plainBits+32,32);DES_E_Transform(copyRight); // 将右半部分进行扩展置换，从32位扩展到48位DES_XOR(copyRight,subKeys[cnt],48); // 将右半部分与子密钥进行异或操作DES_SBOX(copyRight); // 异或结果进入S盒，输出32位结果 DES_P_Transform(copyRight); // P置换DES_XOR(plainBits,copyRight,32); //将明文左半部分与右半部分进行异或 if(cnt != 15){DES_Swap(plainBits,plainBits+32);//最终完成左右部的交换}}DES_IP_1_Transform(plainBits); //逆初始置换（IP^1置换）Bit64ToChar8(plainBits,cipherBlock);return 0;}// 解密单个分组unsigned char DES_DecryptBlock(unsigned char cipherBlock[8], unsigned char subKeys[16][48],unsigned char plainBlock[8]){unsigned char cipherBits[64];unsigned char copyRight[48];short cnt;Char8ToBit64(cipherBlock,cipherBits);//初始置换（IP置换）DES_IP_Transform(cipherBits);// 16轮迭代for(cnt = 15; cnt >= 0; cnt--){memcpy(copyRight,cipherBits+32,32);//将右半部分进行扩展置换，从32位扩展到48位DES_E_Transform(copyRight);// 将右半部分与子密钥进行异或操作DES_XOR(copyRight,subKeys[cnt],48);//异或结果进入S盒，输出32位结果DES_SBOX(copyRight);// P置换DES_P_Transform(copyRight);//将明文左半部分与右半部分进行异或DES_XOR(cipherBits,copyRight,32);if(cnt != 0){// 最终完成左右部的交换DES_Swap(cipherBits,cipherBits+32);}}// 逆初始置换（IP^1置换）DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);return 0;}//加密文件unsigned char DES_Encrypt(unsigned char *keyStr,unsigned char *plainFile,unsigned char *cipherFile){unsigned char keyBlock[8],bKey[64],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流 DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_EncryptBlock(plainFile,subKeys,cipherFile);return 1;}//解密文件unsigned char DES_Decrypt(unsigned char *keyStr,unsigned char *cipherFile,unsigned char *plainFile){// unsigned char plainBlock[8],cipherBlock[8],unsigned char bKey[64],keyBlock[8],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流 DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_DecryptBlock(cipherFile,subKeys,plainFile);return 1;}/****************************************************************************** ****************** 作者：win2kddk* 说明：3重DES是使用16字节密钥将8字节明文数据块进行3次DES加密和解密。
使用DES加密解密代码（C#）支持中文加解密
使⽤DES加密解密代码（C#）⽀持中⽂加解密 C#-----------------------------------------------//名称空间using System;using System.Security.Cryptography;using System.IO;using System.Text;//⽅法//加密⽅法public string Encrypt(string pToEncrypt, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();//把字符串放到byte数组中//原来使⽤的UTF8编码，我改成Unicode编码了，不⾏//byte[] inputByteArray=Encoding.Unicode.GetBytes(pToEncrypt);//建⽴加密对象的密钥和偏移量//原⽂使⽤ASCIIEncoding.ASCII⽅法的GetBytes⽅法//使得输⼊密码必须输⼊英⽂⽂本des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(),CryptoStreamMode.Write);//Write the byte array into the crypto stream//(It will end up in the memory stream)cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();//Get the data back from the memory stream, and into a stringStringBuilder ret = new StringBuilder();foreach(byte b in ms.ToArray()){//Format as hexret.AppendFormat("{0:X2}", b);}ret.ToString();return ret.ToString();}//解密⽅法public string Decrypt(string pToDecrypt, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();//Put the input string into the byte arraybyte[] inputByteArray = new byte[pToDecrypt.Length/2];for(int x = 0; x < pToDecrypt.Length/2; x++){int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));inputByteArray[x] = (byte)i;}//建⽴加密对象的密钥和偏移量，此值重要，不能修改des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(),CryptoStreamMode.Write); //Flush the data through the crypto stream into the memory streamcs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();//Get the decrypted data back from the memory stream//建⽴StringBuild对象，CreateDecrypt使⽤的是流对象，必须把解密后的⽂本变成流对象StringBuilder ret = new StringBuilder();return System.Text.Encoding.Default.GetString(ms.ToArray());}。
DES算法实现（C++版）
DES算法实现（C++版）1 #include "memory.h"2 #include "stdio.h"3enum {encrypt,decrypt};//ENCRYPT:加密，DECRYPT：解密4void des_run(char out[8],char in[8],bool type=encrypt);5//设置密钥6void des_setkey(const char key[8]);7static void f_func(bool in[32],const bool ki[48]);//f函数8static void s_func(bool out[32],const bool in[48]);//s盒代替9//变换10static void transform(bool *out, bool *in, const char *table, int len);11static void xor(bool *ina, const bool *inb, int len);//异或12static void rotatel(bool *in, int len, int loop);//循环左移13//字节组转换成位组14static void bytetobit(bool *out,const char *in, int bits);15//位组转换成字节组16static void bittobyte(char *out, const bool *in, int bits);17//置换IP表18const static char 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 19//逆置换IP-1表20const static char 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 21//E 位选择表22static const char e_table[48]={32,1, 2, 3, 4, 5,4, 5, 6, 7, 8, 9,8, 9, 10,11,12,13,12,13,14,15,16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,28,29,28,29,30,31,32,1};23//P换位表24const static char 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};25//pc1选位表26const static char pc1_table[56]={2757,49,41,33,25,17,9,1,2858,50,42,34,26,18,10,2,2959,51,43,35,27,19,11,3,3060,52,44,36,63,55,47,39,3131,23,15,7,62,54,46,38,3230,22,14,6,61,53,45,37,3329,21,13,5,28,20,12,434 };35//pc2选位表36const static char pc2_table[48]={3714,17,11,24,1,5,3,28,3815,6,21,10,23,19,12,4,3926,8,16,7,27,20,13,2,4041,52,31,37,47,55,30,40,4151,45,33,48,44,49,39,56,4234,53,46,42,50,36,29,3243 };44//左移位数表45const static char loop_table[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};46//S盒47const static char s_box[8][4][16]={48//s14914, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,500, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,514, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,5215, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13,53//s25415, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,553, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,560, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,5713, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9,58//s35910, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,6013, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,6113, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,621, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12,63//s4647, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,6513, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,6610, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,673, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14,68//s5692, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,7014, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,714, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,7211, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3,73//s67412, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,7510, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,769, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,774, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13,78//s7794, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,8013, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,811, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,826, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12,83//s88413, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,851, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,867, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,872, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 1188 };89static bool subkey[16][48];//16圈⼦密钥90void des_run(char out[8],char in[8], bool type)91 {92static bool m[64],tmp[32],*li=&m[0], *ri=&m[32];93 bytetobit(m,in,64);94 transform(m,m,ip_table,64);95if(type==encrypt){96for(int i=0;i<16;i++){97 memcpy(tmp,ri,32);98 f_func(ri,subkey[i]);99 xor(ri,li,32);100 memcpy(li,tmp,32);101 }102 }else{103for(int i=15;i>=0;i--){104 memcpy(tmp,li,32);105 f_func(li,subkey[i]);106 xor(li,ri,32);107 memcpy(ri,tmp,32);108 }109 }110 transform(m,m,ipr_table,64);111 bittobyte(out,m,64);112 }113void des_setkey(const char key[8])114 {115static bool k[64], *kl=&k[0], *kr=&k[28];116 bytetobit(k,key,64);117 transform(k,k,pc1_table,56);118for(int i=0;i<16;i++)119 {120 rotatel(kl,28,loop_table[i]);121 rotatel(kr,28,loop_table[i]);122 transform(subkey[i],k,pc2_table,48);123 }124 }125void f_func(bool in[32],const bool ki[48])126 {127static bool mr[48];128 transform(mr,in,e_table,48);129 xor(mr,ki,48);130 s_func(in,mr);131 transform(in,in,p_table,32);132 }133void s_func(bool out[32],const bool in[48])134 {135for(char i=0,j,k;i<8;i++,in+=6,out+=4)136 {137 j=(in[0]<<1)+in[5];138 k=(in[1]<<3)+(in[2]<<2)+(in[3]<<1)+in[4];139 bytetobit(out,&s_box[i][j][k],4);140 }141 }142void transform(bool *out,bool *in,const char *table,int len) 143 {144static bool tmp[256];145for(int i=0;i<len;i++)146 tmp[i]=in[table[i]-1];147 memcpy(out,tmp,len);148 }149void xor(bool *ina,const bool *inb,int len)150 {151for(int i=0;i<len;i++)152 ina[i]^=inb[i];153 }154void rotatel(bool *in,int len,int loop)155 {156static bool tmp[256];157 memcpy(tmp,in,loop);158 memcpy(in,in+loop,len-loop);159 memcpy(in+len-loop,tmp,loop);160 }161void bytetobit(bool *out,const char *in,int bits)162 {163for(int i=0;i<bits;i++)164out[i]=(in[i/8]>>(i%8)) &1;165 }166void bittobyte(char *out,const bool *in,int bits)167 {168 memset(out,0,(bits+7)/8);169for(int i=0;i<bits;i++)170out[i/8]|=in[i]<<(i%8);171 }172void main()173 {174char key[8]={'p','r','o','g','r','a','m'},str[8];175 puts("*****************DES***********************");176 printf("\n");177 printf("\n");178 puts("please input your words");179 gets(str);180 printf("\n");181 puts("****************************************");182 des_setkey(key);183 des_run(str,str,encrypt);184 puts("after encrypting:");185 puts(str);186 printf("\n");187 puts("****************************************");188 puts("after decrypting:");189 des_run(str,str,decrypt);190 puts(str);191 printf("\n");192 puts("****************************************");193 printf("\n");194 }。
c++DES加密代码
c++DES加密代码#ifndef __DES_H#define __DES_Hclass DES{public: // Encrypt/decrypt the data in "data", according to the "key". // Caller is responsible for confirming the buffer size of "data" // points to is 8*"blocks" bytes. // The data encrypted/decrypted is stored in data. // The return code is 1:success, other:failed. int encrypt ( unsigned char key[8], unsigned char* data, int blocks = 1 ); int decrypt ( unsigned char key[8], unsigned char* data, int blocks = 1 ); // Encrypt/decrypt any size data,according to a special method. // Before calling yencrypt, copy data to a new buffer with size // calculated by extend. int yencrypt ( unsigned char key[8], unsigned char* data, int size ); int ydecrypt ( unsigned char key[8], unsigned char* in, int blocks, int* size = 0 ); int extend ( int size ) { return (size/8+1)*8; };private: void des(unsigned char* in, unsigned char* out, int blocks); void des_block(unsigned char* in, unsigned char* out);private: unsigned long KnL[32]; enum Mode { ENCRYPT, DECRYPT }; void deskey(unsigned char key[8], Mode md); void usekey(unsigned long *); void cookey(unsigned long *);private: void scrunch(unsigned char *, unsigned long *); void unscrun(unsigned long *, unsigned char *); void desfunc(unsigned long *, unsigned long *);private: static unsigned char Df_Key[24]; static unsigned short bytebit[8]; static unsigned long bigbyte[24]; static unsigned char pc1[56]; static unsigned char totrot[16]; static unsigned char pc2[48]; static unsigned long SP1[64]; static unsigned long SP2[64]; static unsigned long SP3[64]; static unsigned long SP4[64]; static unsigned long SP5[64];};#endif⽽后，具体实现DES类：//des.cpp#include <string.h>#include "Sinodes.h"int DES::encrypt ( unsigned char key[8], unsigned char* data, int blocks ){ if ((!data)||(blocks<1)) return 0; deskey ( key, ENCRYPT ); des ( data, data, blocks); return 1;};int DES::decrypt ( unsigned char key[8], unsigned char* data, int blocks ){ if ((!data)||(blocks<1)) return 0; deskey ( key, DECRYPT ); des ( data, data, blocks); return 1;};int DES::yencrypt ( unsigned char key[8], unsigned char* data, int size ){ if ((!data)||(size<1)) return 0; // The last char of data is bitwise complemented and filled the rest // buffer.If size is 16, it will extend to 24,and 17 still 24. char lastChar = *(data+size-1); int blocks = size/8+1; memset(data+size, ~lastChar, blocks*8-size); deskey( key, ENCRYPT ); return encrypt ( data, data, blocks);};int DES::ydecrypt ( unsigned char key[8], unsigned char* data, int blocks, int* size ) { if ( (!data) || (blocks<1) ) return 0; deskey ( key, DECRYPT ); if ( !decrypt ( data, data, blocks) ) return 0; if ( size != 0 ) { pos--; if ( data[pos] != ~endChar ) return 0; *size = pos+1; } return 1;};// -----------------------------------------------------------------------// des// Encrpts/Decrypts(according to the key currently loaded int the// internal key reGISter) SOME blocks of eight bytes at address 'in' // into the block at address 'out'. They can be the same.//// "in"// "out"// "block" Number of blocks.// -----------------------------------------------------------------------void DES::des ( unsigned char* in, unsigned char* out, int blocks ){for (int i = 0; i < blocks; i++,in+=8,out+=8) des_block(in,out);};// -----------------------------------------------------------------------// des_block// Encrpts/Decrypts(according to the key currently loaded int the// internal key register) one block of eight bytes at address 'in'// into the block at address 'out'. They can be the same.//// "in"// "out"// -----------------------------------------------------------------------void DES::des_block(unsigned char *in, unsigned char *out){unsigned long work[2];scrunch(in, work);desfunc(work, KnL);unscrun(work, out);};// ----------------------------------------------------------------------// deskey// Sets the internal key register (KnR) according to the hexadecimal // key contained in the 8 bytes of hexkey, according to the DES,// for encryption or decrytion according to MODE//// "key" is the 64 bits key.// "md" means encryption or decryption.// ----------------------------------------------------------------------void DES::deskey(unsigned char key[8], Mode md)unsigned long kn[32];for (j = 0; j < 56; j++) { l = pc1[j]; m = l & 07; pc1m[j] = (key[l >> 3] & bytebit[m]) ? 1:0;}for (ii = 0; ii < 16; ii++) { if (md == DECRYP) m = (15 - ii) << 1; else m = ii << 1; n = m + 1; kn[m] = kn[n] = 0L; for (j = 0; j < 28; j++) { l = j + totrot[ii]; if (l < 28) pcr[j] = pc1m[l]; else pcr[j] = pc1m[l - 28]; } for (j = 28; j < 56; j++) { l = j + totrot[ii]; if (l < 56) pcr[j] = pc1m[l]; else pcr[j] = pc1m[l - 28]; } for (j = 0; j < 24; j++) { if (pcr[ pc2[j] ]) kn[m] |= bigbyte[j]; if (pcr[ pc2[j+24] ]) kn[n] |= bigbyte[j]; }}cookey(kn);return;};// ----------------------------------------------------------------------// cookey// Only called by deskey.// -----------------------------------------------------------------------void DES::cookey(register unsigned long *raw1){register unsigned long *cook, *raw0;unsigned long dough[32];register int i;cook = dough;for (i = 0; i < 16; i++, raw1++) { raw0 = raw1++; *cook = (*raw0 & 0x00fc0000L) << 6; *cook |= (*raw0 & 0x00000fc0L) << 10; *cook |= (*raw1 & 0x00fc0000L) >> 10; *cook++ |= (*raw1 & 0x00000fc0L) >> 6; *cook = (*raw0 & 0x0003f000L) << 12; *cook |= (*raw0 & 0x0000003fL) << 16; *cook |= (*raw1 & 0x0003f000L) >> 4; *cook++ |= (*raw1 & 0x0000003fL);};// ----------------------------------------------------------------------// usekey// Only called by cookey.// Loads the interal key register with the data in cookedkey.// -----------------------------------------------------------------------void DES::usekey(register unsigned long *from){register unsigned long *to, *endp;to = KnL, endp = &KnL[32];while (to < endp) *to++ = *from++;return;};void DES::scrunch(register unsigned char *outof, register unsigned long *into ) {*into = (*outof++ & 0xffL) << 24;*into |= (*outof++ & 0xffL) << 16;*into |= (*outof++ & 0xffL) << 8;*into++ |= (*outof++ & 0xffL);*into = (*outof++ & 0xffL) << 24;*into |= (*outof++ & 0xffL) << 16;*into |= (*outof++ & 0xffL) << 8;*into |= (*outof & 0xffL);return;};void DES::unscrun(register unsigned long *outof, register unsigned char *into) {*into++ = (*outof >> 24) & 0xffL;*into++ = (*outof >> 16) & 0xffL;*into++ = (*outof >> 8) & 0xffL;*into++ = *outof++ & 0xffL;*into++ = (*outof >> 24) & 0xffL;*into++ = (*outof >> 16) & 0xffL;*into++ = (*outof >> 8) & 0xffL;*into = *outof & 0xffL;return;};void DES::desfunc(register unsigned long *block,register unsigned long *keys) {register unsigned long fval, work, right, leftt;register int round;leftt = block[0];right = block[1];work = ((leftt >> 4) ^ right) & 0x0f0f0f0fL;right ^= work;leftt ^= (work << 4);work = ((right >> 2) ^ leftt) & 0x33333333L;leftt ^= work;right ^= (work << 2);work = ((right >> 8) ^ leftt) & 0x00ff00ffL;leftt ^= work;right ^= (work << 8);right = ((right << 1) | ((right >> 31) & 1L)) & 0xffffffffL; work = (leftt ^ right) & 0xaaaaaaaaL;leftt ^= work;right ^= work;leftt = ((leftt << 1) | ((leftt >> 31) & 1L)) & 0xffffffffL;for (round = 0; round < 8; round++) { work = (right << 28) | (right >> 4); work ^= *keys++; fval = SP7[work & 0x3fL]; fval |= SP5[(work >> 8) & 0x3fL]; fval |= SP3[(work >> 16) & 0x3fL]; fval |= SP1[(work >> 24) & 0x3fL]; work = right ^ *keys++; fval |= SP8[work & 0x3fL]; fval |= SP6[(work >> 8) & 0x3fL]; fval |= SP4[(work >> 16) & 0x3fL]; fval |= SP2[(work >> 24) & 0x3fL]; leftt ^= fval; work = (leftt << 28) | (leftt >> 4); work ^= *keys++; fval = SP7[work & 0x3fL]; fval |= SP5[(work >> 8) & 0x3fL]; fval |= SP3[(work >> 16) & 0x3fL]; fval |= SP1[(work >> 24) & 0x3fL]; work = leftt ^ *keys++; fval |= SP8[work & 0x3fL]; fval |= SP6[(work >> 8) & 0x3fL]; fval |= SP4[(work >> 16) & 0x3fL]; fval |= SP2[(work >> 24) & 0x3fL]; right ^= fval;}right = (right << 31) | (right >> 1);work = (leftt ^ right) & 0xaaaaaaaaL;leftt ^= work;right ^= work;leftt = (leftt << 31) | ( leftt >> 1);work = ((leftt >> 8) ^ right) & 0x00ff00ffL;right ^= work;leftt ^= (work << 8);work = ((leftt >> 2) ^ right) & 0x33333333L;right ^= work;leftt ^= (work << 2);work = ((right >> 16) ^ leftt) & 0x0000ffffL;leftt ^= work;right ^= (work << 16);*block++ = right;*block = leftt;return;};// -----------------------------------------------------------------------// Initial of static data members. These data will be used by all the // instances of class,and can not be changed.// -----------------------------------------------------------------------unsigned char DES::Df_Key[24] = { 0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67 };unsigned short DES::bytebit[8] = { 0200, 0100, 040, 020, 010, 04, 02, 01 };unsigned long DES::bigbyte[24] = { 0x800000L, 0x400000L, 0x200000L, 0x100000L, 0x80000L, 0x40000L, 0x20000L, 0x10000L, 0x8000L, 0x4000L, 0x2000L, 0x1000L, 0x800L, 0x400L, 0x200L, 0x100L, 0x80L, 0x40L, 0x20L, 0x10L, 0x8L, 0x4L, 0x2L, 0x1L };unsigned char DES::pc1[56] = { 56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17, 9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35, 62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21, 13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3 };unsigned char DES::totrot[16] = { 1, 2, 4, 6, 8, 10, 12, 14, 15, 17, 19, 21, 23, 25, 27, 28 };unsigned char DES::pc2[48] = { 13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9, 22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1, 40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47, 43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31 };。
C#加密解密（DES,AES,Base64,md5,SHA256,RSA,RC4）
C#加密解密（DES,AES,Base64,md5,SHA256,RSA,RC4）⼀:异或^简单加解密(数字类型)1:原理:异或⽤于⽐较两个⼆进制数的相应位,在执⾏按位"异或"运算时,如果两个⼆进制数的相应位都为1或者都为0,则返回0;如果两个⼆进制数的相应位其中⼀个为1另⼀个为0,则返回1.//对数字加密int P_int_Num, P_int_Key;//定义两个值类型变量string Encryptstr = (P_int_Num ^ P_int_Key).ToString();//加密数值//对数字解密int P_int_Key, P_int_Encrypt;//定义两个值类型变量string Encryptstr =(P_int_Encrypt ^ P_int_Key).ToString();//解密数值⼆:加密解密类public class JiaMiJieMi{#region DES对称加密解密///<summary>加密字符串///</summary>///<param name="strText">需被加密的字符串</param>///<param name="strEncrKey">密钥</param>///<returns></returns>public static string DesEncrypt(string strText, string strEncrKey){try{byte[] byKey = null;byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));DESCryptoServiceProvider des = new DESCryptoServiceProvider();byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return Convert.ToBase64String(ms.ToArray());}catch{return"";}}///<summary>解密字符串///</summary>///<param name="strText">需被解密的字符串</param>///<param name="sDecrKey">密钥</param>///<returns></returns>public static string DesDecrypt(string strText, string sDecrKey){try{byte[] byKey = null;byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };byte[] inputByteArray = new Byte[strText.Length];byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));DESCryptoServiceProvider des = new DESCryptoServiceProvider();inputByteArray = Convert.FromBase64String(strText);MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();Encoding encoding = new UTF8Encoding();return encoding.GetString(ms.ToArray());}catchreturn null;}}///<summary>加密⽂件//////</summary>///<param name="m_InFilePath">原路径</param>///<param name="m_OutFilePath">加密后的⽂件路径</param>///<param name="strEncrKey">密钥</param>public static void DesEncryptFile(string m_InFilePath, string m_OutFilePath, string strEncrKey){try{byte[] byKey = null;byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);fout.SetLength(0);//Create variables to help with read and write.byte[] bin = new byte[100]; //This is intermediate storage for the encryption.long rdlen = 0; //This is the total number of bytes written.long totlen = fin.Length; //This is the total length of the input file.int len; //This is the number of bytes to be written at a time.DES des = new DESCryptoServiceProvider();CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);//Read from the input file, then encrypt and write to the output file.while (rdlen < totlen){len = fin.Read(bin, 0, 100);encStream.Write(bin, 0, len);rdlen = rdlen + len;}encStream.Close();fout.Close();fin.Close();}catch{}}///<summary>解密⽂件//////</summary>///<param name="m_InFilePath">被解密路径</param>///<param name="m_OutFilePath">解密后的路径</param>///<param name="sDecrKey">密钥</param>public static void DesDecryptFile(string m_InFilePath, string m_OutFilePath, string sDecrKey){try{byte[] byKey = null;byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));FileStream fin = new FileStream(m_InFilePath, FileMode.Open, FileAccess.Read);FileStream fout = new FileStream(m_OutFilePath, FileMode.OpenOrCreate, FileAccess.Write);fout.SetLength(0);//Create variables to help with read and write.byte[] bin = new byte[100]; //This is intermediate storage for the encryption.long rdlen = 0; //This is the total number of bytes written.long totlen = fin.Length; //This is the total length of the input file.int len; //This is the number of bytes to be written at a time.DES des = new DESCryptoServiceProvider();CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);//Read from the input file, then encrypt and write to the output file.while (rdlen < totlen){len = fin.Read(bin, 0, 100);encStream.Write(bin, 0, len);rdlen = rdlen + len;}encStream.Close();fout.Close();fin.Close();catch{}}#endregion#region对称加密算法AES RijndaelManaged加密解密private static readonly string Default_AES_Key = "@#kim123";private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79,0x53,0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };public static string AES_Encrypt(string encryptString){return AES_Encrypt(encryptString, Default_AES_Key);}public static string AES_Decrypt(string decryptString){return AES_Decrypt(decryptString, Default_AES_Key);}///<summary>对称加密算法AES RijndaelManaged加密(RijndaelManaged（AES）算法是块式加密算法) //////</summary>///<param name="encryptString">待加密字符串</param>///<param name="encryptKey">加密密钥，须半⾓字符</param>///<returns>加密结果字符串</returns>public static string AES_Encrypt(string encryptString, string encryptKey){encryptKey = GetSubString(encryptKey, 32, "");encryptKey = encryptKey.PadRight(32, '');RijndaelManaged rijndaelProvider = new RijndaelManaged();rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 32));rijndaelProvider.IV = Keys;ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();byte[] inputData = Encoding.UTF8.GetBytes(encryptString);byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, 0, inputData.Length);return Convert.ToBase64String(encryptedData);}///<summary>对称加密算法AES RijndaelManaged解密字符串//////</summary>///<param name="decryptString">待解密的字符串</param>///<param name="decryptKey">解密密钥,和加密密钥相同</param>///<returns>解密成功返回解密后的字符串,失败返回空</returns>public static string AES_Decrypt(string decryptString, string decryptKey){try{decryptKey = GetSubString(decryptKey, 32, "");decryptKey = decryptKey.PadRight(32, '');RijndaelManaged rijndaelProvider = new RijndaelManaged();rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);rijndaelProvider.IV = Keys;ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();byte[] inputData = Convert.FromBase64String(decryptString);byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, 0, inputData.Length);return Encoding.UTF8.GetString(decryptedData);}catch{return string.Empty;}}///<summary>///按字节长度(按字节,⼀个汉字为2个字节)取得某字符串的⼀部分///</summary>///<param name="sourceString">源字符串</param>///<param name="length">所取字符串字节长度</param>///<param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，⼀般为"...")</param> ///<returns>某字符串的⼀部分</returns>private static string GetSubString(string sourceString, int length, string tailString){return GetSubString(sourceString, 0, length, tailString);}///<summary>///按字节长度(按字节,⼀个汉字为2个字节)取得某字符串的⼀部分///</summary>///<param name="sourceString">源字符串</param>///<param name="startIndex">索引位置，以0开始</param>///<param name="length">所取字符串字节长度</param>///<param name="tailString">附加字符串(当字符串不够长时，尾部所添加的字符串，⼀般为"...")</param>///<returns>某字符串的⼀部分</returns>private static string GetSubString(string sourceString, int startIndex, int length, string tailString){string myResult = sourceString;//当是⽇⽂或韩⽂时(注:中⽂的范围:\u4e00 - \u9fa5, ⽇⽂在\u0800 - \u4e00, 韩⽂为\xAC00-\xD7A3)if (System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\u0800-\u4e00]+") ||System.Text.RegularExpressions.Regex.IsMatch(sourceString, "[\xAC00-\xD7A3]+")){//当截取的起始位置超出字段串长度时if (startIndex >= sourceString.Length){return string.Empty;}else{return sourceString.Substring(startIndex,((length + startIndex) > sourceString.Length) ? (sourceString.Length - startIndex) : length); }}//中⽂字符，如"中国⼈民abcd123"if (length <= 0){return string.Empty;}byte[] bytesSource = Encoding.Default.GetBytes(sourceString);//当字符串长度⼤于起始位置if (bytesSource.Length > startIndex){int endIndex = bytesSource.Length;//当要截取的长度在字符串的有效长度范围内if (bytesSource.Length > (startIndex + length)){endIndex = length + startIndex;}else{ //当不在有效范围内时,只取到字符串的结尾length = bytesSource.Length - startIndex;tailString = "";}int[] anResultFlag = new int[length];int nFlag = 0;//字节⼤于127为双字节字符for (int i = startIndex; i < endIndex; i++){if (bytesSource[i] > 127){nFlag++;if (nFlag == 3){nFlag = 1;}}else{nFlag = 0;}anResultFlag[i] = nFlag;}//最后⼀个字节为双字节字符的⼀半if ((bytesSource[endIndex - 1] > 127) && (anResultFlag[length - 1] == 1)){length = length + 1;}byte[] bsResult = new byte[length];Array.Copy(bytesSource, startIndex, bsResult, 0, length);myResult = Encoding.Default.GetString(bsResult);myResult = myResult + tailString;return myResult;}return string.Empty;}///<summary>///加密⽂件流///</summary>///<param name="fs"></param>///<returns></returns>public static CryptoStream AES_EncryptStrream(FileStream fs, string decryptKey){decryptKey = GetSubString(decryptKey, 32, "");decryptKey = decryptKey.PadRight(32, '');RijndaelManaged rijndaelProvider = new RijndaelManaged();rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);rijndaelProvider.IV = Keys;ICryptoTransform encrypto = rijndaelProvider.CreateEncryptor();CryptoStream cytptostreamEncr = new CryptoStream(fs, encrypto, CryptoStreamMode.Write);return cytptostreamEncr;}///<summary>///解密⽂件流///</summary>///<param name="fs"></param>///<returns></returns>public static CryptoStream AES_DecryptStream(FileStream fs, string decryptKey){decryptKey = GetSubString(decryptKey, 32, "");decryptKey = decryptKey.PadRight(32, '');RijndaelManaged rijndaelProvider = new RijndaelManaged();rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);rijndaelProvider.IV = Keys;ICryptoTransform Decrypto = rijndaelProvider.CreateDecryptor();CryptoStream cytptostreamDecr = new CryptoStream(fs, Decrypto, CryptoStreamMode.Read);return cytptostreamDecr;}///<summary>///对指定⽂件加密///</summary>///<param name="InputFile"></param>///<param name="OutputFile"></param>///<returns></returns>public static bool AES_EncryptFile(string InputFile, string OutputFile){try{string decryptKey = "";FileStream fr = new FileStream(InputFile, FileMode.Open);FileStream fren = new FileStream(OutputFile, FileMode.Create);CryptoStream Enfr = AES_EncryptStrream(fren, decryptKey);byte[] bytearrayinput = new byte[fr.Length];fr.Read(bytearrayinput, 0, bytearrayinput.Length);Enfr.Write(bytearrayinput, 0, bytearrayinput.Length);Enfr.Close();fr.Close();fren.Close();}catch{//⽂件异常return false;}return true;}///<summary>///对指定的⽂件解压缩///</summary>///<param name="InputFile"></param>///<param name="OutputFile"></param>///<returns></returns>public static bool AES_DecryptFile(string InputFile, string OutputFile){try{string decryptKey = "";FileStream fr = new FileStream(InputFile, FileMode.Open);FileStream frde = new FileStream(OutputFile, FileMode.Create);CryptoStream Defr = AES_DecryptStream(fr, decryptKey);byte[] bytearrayoutput = new byte[1024];int m_count = 0;do{m_count = Defr.Read(bytearrayoutput, 0, bytearrayoutput.Length);frde.Write(bytearrayoutput, 0, m_count);if (m_count < bytearrayoutput.Length)break;} while (true);Defr.Close();fr.Close();frde.Close();}catch{//⽂件异常return false;}return true;}#endregion#region Base64加密解密///<summary>/// Base64是⼀種使⽤64基的位置計數法。
C语言加密与解密算法详解
C语言加密与解密算法详解1. 引言在信息时代，数据的保密性至关重要。
加密与解密算法是一种重要的保护数据安全性的技术手段。
本文将详细介绍C语言中的加密与解密算法，包括常用的对称加密算法和非对称加密算法。
2. 对称加密算法2.1 Caesar密码Caesar密码是一种简单的替换密码算法，通过将每个字母向后移动固定的位数来加密消息。
解密操作是将每个字母向前移动相同的位数。
2.2 DES算法数据加密标准（DES）是一种对称加密算法，使用56位的密钥对64位的数据进行加密。
DES算法通过多轮迭代和复杂的置换与代换操作来实现高强度的加密。
3. 非对称加密算法3.1 RSA算法RSA算法是一种常用的非对称加密算法。
它通过使用两个密钥：一个公钥和一个私钥，来实现加密和解密操作。
发送方使用接收方的公钥进行加密，而接收方使用自己的私钥进行解密。
3.2 椭圆曲线加密算法椭圆曲线加密算法（ECC）是一种基于椭圆曲线数学原理的非对称加密算法。
它具有较小的密钥长度和高安全性的特点，适用于资源受限的设备。
4. 加密与解密实例4.1 使用Caesar密码加密与解密字符串下面是使用C语言实现Caesar密码算法的示例代码： ```// Caesar密码加密函数void caesarEncrypt(char* text, int key) {int i = 0;while (text[i] != '\0') {if (isalpha(text[i])) {if (islower(text[i])) {text[i] = (text[i] - 'a' + key) % 26 + 'a';} else {text[i] = (text[i] - 'A' + key) % 26 + 'A';}}i++;}}// Caesar密码解密函数void caesarDecrypt(char* text, int key) {caesarEncrypt(text, 26 - key);}```4.2 使用RSA算法加密与解密数据下面是使用C语言中的openssl库实现RSA算法的示例代码：```// RSA加密函数int rsaEncrypt(unsigned char* plainText, int plainTextLen, unsigned char* encryptedText) {// 使用公钥进行加密操作// ...}// RSA解密函数int rsaDecrypt(unsigned char* encryptedText, int encryptedTextLen, unsigned char* decryptedText) {// 使用私钥进行解密操作// ...}```5. 总结加密与解密算法在数据保密性方面发挥着重要的作用。
C#DES（cbc）加密解密（最简单的加密解密）
C#DES（cbc）加密解密（最简单的加密解密）微软官⽹的这个⽰例正的是该换了，⼀点⽤处没看出来/// <summary>/// DES CBC 加密/// </summary>/// <param name="encryStr"></param>/// <param name="key"></param>/// <param name="iv"></param>/// <returns></returns>public static string DesCBCEncryptor(string encryStr,string key,string iv){byte[] rgbKey = Encoding.UTF8.GetBytes(key);byte[] rgbIV = Encoding.UTF8.GetBytes(iv);byte[] inputByteArray = Encoding.UTF8.GetBytes(encryStr);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();using (MemoryStream mStream = new MemoryStream()){using (CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write)) {cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();byte[] srteamArray = mStream.ToArray();mStream.Close();mStream.Dispose();return Convert.ToBase64String(srteamArray);}}}/// <summary>/// DES CBC 解密/// </summary>/// <param name="decryStr"></param>/// <param name="key"></param>/// <param name="iv"></param>/// <returns></returns>public static string DesCBCDecryptor(string decryStr, string key, string iv){byte[] rgbKey = Encoding.UTF8.GetBytes(key);byte[] rgbIV = Encoding.UTF8.GetBytes(iv);byte[] inputByteArray = Convert.FromBase64String(decryStr);DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();using (MemoryStream mStream = new MemoryStream()){using (CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write)) {cStream.Write(inputByteArray, 0, inputByteArray.Length);cStream.FlushFinalBlock();byte[] srteamArray = mStream.ToArray();mStream.Close();mStream.Dispose();return Encoding.UTF8.GetString(srteamArray);}}}。
DES源代码C语言实现(简洁易懂)
#include<>/* 初始置换表IP */int IP_Table[64] = { 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, 56,48,40,32,24,16,8,0, 58,50,42,34,26,18,10,2, 60,52,44,36,28,20,12,4, 62,54,46,38,30,22,14,6}; /* 逆初始置换表IP */int IP_1_Table[64] = {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, 32,0,40,8,48,16,56,24}; /* 扩充置换表E */int E_Table[48] = {31, 0, 1, 2, 3, 4,3, 4, 5, 6, 7, 8,7, 8,9,10,11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,21,22,23,24,23,24,25,26,27,28,27,28,29,30,31,0};/* 置换函数P */int P_Table[32] = {15,6,19,20,28,11,27,16, 0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24}; /* S盒 */int S[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 */{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},{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}}}; /* 置换选择1 */int PC_1[56] = {56,48,40,32,24,16,8,0,57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,60,52,44,36,28,20,12,4,27,19,11,3};/* 置换选择2 */int PC_2[48] = {13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,47,43,48,38,55,33,52,45,41,49,35,28,31};//把8X6的数组变成一个一维数组void change1(int E[8][6],int r[48]) {i nt i,j;f or(i=0;i<8;i++){for(j=0;j<6;j++){r[i*6+j] = E[i][j];}}}//把一维数组变成8X6的矩阵void change2(int r[48],int E[8][6]) {i nt i,j;f or(i=0;i<8;i++){for(j=0;j<6;j++){E[i][j]= r[i*6+j];}}}//输入16进制明文void input(int M[8][8]){i nt i,j,k;c har c[16];i nt s[16],d[64],a[16][4];printf("请输入16位16进制数：");f or(i=0;i<16;i++){scanf("%c",&c[i]);}for(i=0;i<16;i++){if(c[i]>=48&&c[i]<=58)s[i]=c[i]-48;else if(c[i]>='A'&&c[i]<='Z')s[i]=c[i]-55;else if(c[i]>='a'&&c[i]<='z')s[i]=c[i]-87;else{puts("error\n");return;}}//把16进制数组c[]转化为二进制数：k=0;while(k<16)//每一位分解为四位，注意输出顺序就可以了 {for(j=3;j>=0;j--){a[k][j]=s[k]%2;s[k]/=2;}k++;}//把a[16][4]转化成a[8][8]类型数组for(k=0;k<16;k++){for(j=0;j<4;j++){d[k*4+j] = a[k][j];}}for(i=0;i<8;i++){for(j=0;j<8;j++){M[i][j] = d[i*8+j];}}/*//打印密文二进制数组for(i=0;i<8;i++){for(j=0;j<8;j++){printf("%2d",M[i][j]);}printf("\n");}*/}/*初始置换*/void Startedexchange(int MW[8][8],int temp[8][8]) {int i,j,a[64],b[64];for(i=0;i<8;i++){for(j=0;j<8;j++)a[i*8+j] = MW[i][j];}for(i=0;i<64;i++){b[i] = a[IP_Table[i]];}for(i=0;i<8;i++){f or(j=0;j<8;j++){temp[i][j] = b[i*8+j];}}/*for(i=0;i<8;i++){for(j=0;j<8;j++){printf("%2d",temp[i][j]);}printf("\n");}*/}/*生成秘钥*/void bornkey(int MY[8][8],int n,int key [48]) {int i,j,m;int tem,tem2;int k[64],k1[56];int a[8][7];int c[28],d[28];int list[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; for(i=0;i<8;i++){f or(j=0;j<8;j++){k[i*8+j] = MY[i][j];}}for(i=0;i<8;i++){f or(j=0;j<7;j++){a[i][j] = k[PC_1[i*7+j]];}}/*for(i=0;i<8;i++){f or(j=0;j<7;j++){printf("%d",a[i][j]);}}printf("\n");*///c0,d0for(i=0;i<4;i++){f or(j=0;j<7;j++){c[i*7+j] = a[i][j];}}for(i=4;i<8;i++){f or(j=0;j<7;j++){d[i*7+j-28] = a[i][j];}}//确定左移位数m = 0;for(i=0;i<n;i++){m+=list[i];}//循环左移处理while(m){tem=c[0];for(i=0;i<27;i++) {c[i] = c[i+1];}c[27] = tem;tem2 = d[0];for(i=0;i<27;i++) {d[i] = d[i+1];}d[27] = tem2;m--;}/*for(i=0;i<28;i++) {p rintf("%d",d[i]); }printf("\n");*///合并for(i=0;i<28;i++) {k1[i] = c[i];}for(i=0;i<28;i++) {k1[28+i] = d[i];}//置换选择2for(i=0;i<48;i++){k ey[i] = k1[PC_2[i]];}}//第一次异或void firstXOR(int key[48],int R[48],int k2[48]) {i nt i;f or(i=0;i<48;i++){if(R[i]!=key[i]){k2[i] = 1;}elsek2[i] = 0;}}//S盒压缩变换void Schange(int k2[48],int k3[32]){i nt i,h,l,a,temp,k,m,j;int b[8][6];i nt num[4];change2(k2,b);m=0;//printf("\n");for(i=0;i<8;i++){h=2*b[i][0]+b[i][5];l=8*b[i][1]+4*b[i][2]+2*b[i][3]+b[i][4];a = S[i][h][l];//printf("%d ",a);//把a装换成二进制输出k=3;w hile(a!=0){temp = a%2;a = a/2;num[k] = temp;k--;}w hile(k>=0){num[k]=0;k--;}f or(j=0;j<4;j++){k3[m] = num[j];m++;}}}//置换运算Pvoid Pchange(int k3[32],int p[32]){int i;for(i=0;i<32;i++){p[i] = k3[P_Table[i]];}}//拓展变换void extension(int a[32],int b[48]){int i;for(i=0;i<48;i++){b[i] = a[E_Table[i]];}}void feistel(int R[32], int key[48],int p[32]) {int b[48],k2[48],k3[32];extension(R,b);firstXOR(key,b,k2);//key后半部分出现问题Schange(k2,k3);Pchange(k3,p);}//第二次异或void SecondXOR(int L[32],int p[32],int R1[32]){i nt i;f or(i=0;i<32;i++){if(L[i]!=p[i]){R1[i] = 1;}elseR1[i] = 0;}}/*把明文分成两部分32+32*/void divideLR(int temp[8][8],int L[32],int R[32]) {i nt i,j;f or(i=0;i<4;i++){for(j=0;j<8;j++){L[i*8+j] = temp[i][j];}}f or(i=0;i<4;i++){for(j=0;j<8;j++){R[i*8+j] = temp[i+4][j];}}}void exchange(int R[32],int L[32]){int i;for(i=0;i<32;i++){L[i] = R[i];}}//逆初始置换void restartexchange(int L[32],int R[32],int secret[64]) {int a[64];int i;for(i=0;i<32;i++){a[i] = L[i];}for(i=0;i<32;i++){a[32+i] = R[i];}for(i=0;i<64;i++){secret[i] = a[IP_1_Table[i]];}}// 将二进制数转化为16进制void BtoOX (int a[64], char b [16]){i nt i,j,k,n,r;n=0;f or(i=0;i<16;i++){k=8;r=0;for(j=1;j<5;j++){r+=a[n]*k;k=k/2;n++;}if(r<10)b[i]=r+48;elseb[i]=r+55;}}void main(){int i,j,a;int MW[8][8];//密文int MY[8][8];//秘钥int temp[8][8];//过渡数组int L[32];//左边加密部分int R[32];//右边加密部分int R1[32];int key[48];//生成的秘钥int p[32];int secret[64];//密文二进制表示char miwen[16];printf("请输入明文：");input(MW);getchar();Startedexchange(MW,temp);divideLR(temp,L,R);printf("请输入秘钥：");input(MY);//打印密文二进制数组a = 1;while(a<=15){bornkey(MY,a,key);//truefeistel(R,key,p);SecondXOR(L,p,R1);exchange(R,L);exchange(R1,R);a++;}//第16次迭代bornkey(MY,16,key);feistel(R,key,p);SecondXOR(L,p,R1);exchange(R1,L);restartexchange(L,R,secret);BtoOX(secret,miwen);printf("\n");for(i=0;i<16;i++){p rintf("%c",miwen[i]); }printf("\n");}。
C语言实现DES加密解密算法
C语言实现DES加密解密算法
最近几十年里，DES（Data Encryption Standard）算法的发展起到
了极其重要的作用。
Des算法是一种基于分组密码的算法。
算法将64位
的明文数据块按位分组成8个字节，每一组以8位为单位转换成一个64
位的密文数据块，采用16轮的分组加密，每次密码变化，保证加密强度。
本文详细介绍了DES算法的C语言实现，并分别介绍了加解密算法的实现
步骤以及DES加解密测试过程。
一、DES算法C语言实现
1.函数原型
DES算法的实现包括加密和解密函数，函数原型如下：
unsigned char* DesEncrypt(unsigned char *src, unsigned char
*key); // DES加密函数
unsigned char* DesDecrypt(unsigned char *src, unsigned char
*key); // DES解密函数
输入参数src是指明文源数据，key是加解密密钥，输出参数为一个
指向加解密结果的字符串指针。
2.加解密算法
（1）DES加密算法
DES加密算法步骤如下：
（i）初始置换：将64位明文块做一次IP置换得到L0R0。
（ii）迭代轮换：对L0R0经过16次迭代轮换后，最终结果为
L16R16
（iii）逆置换：L16R16进行逆置换得到64位密文。
（2）DES解密算法
DES解密算法步骤和DES加密算法步骤是一样的，只是将置换步骤改为逆置换，将轮换步骤改为逆轮换即可。
三、DES加解密测试
1.程序测试
在C语言编写完DES加解密算法之后。
C语言实现数据加密算法
C语言实现数据加密算法数据加密是对敏感信息进行转换的过程，以保护数据的机密性和完整性。
C语言提供了强大的工具和库来实现各种加密算法，包括对称加密和非对称加密等。
对称加密算法是一种使用相同密钥加密和解密数据的方法。
其中最常见的算法是DES(Data Encryption Standard)和AES(Advanced Encryption Standard)。
下面是一个实现AES算法的示例代码：```c#include <stdio.h>#include <stdlib.h>#include <string.h>#include <openssl/aes.h>void encrypt_data(const unsigned char *data, size_t len, const unsigned char *key, unsigned char *encrypted_data) AES_KEY aes_key;AES_set_encrypt_key(key, 128, &aes_key);AES_encrypt(data, encrypted_data, &aes_key);void decrypt_data(const unsigned char *encrypted_data,size_t len, const unsigned char *key, unsigned char *data) AES_KEY aes_key;AES_set_decrypt_key(key, 128, &aes_key);AES_decrypt(encrypted_data, data, &aes_key);int maiunsigned char data[AES_BLOCK_SIZE] = "hello world!";size_t len = sizeof(data);unsigned char encrypted_data[AES_BLOCK_SIZE];encrypt_data(data, len, key, encrypted_data);unsigned char decrypted_data[AES_BLOCK_SIZE];decrypt_data(encrypted_data, len, key, decrypted_data);printf("Original Data: %s\n", data);printf("Encrypted Data: ");for (int i = 0; i < len; i++)printf("%02x ", encrypted_data[i]);}printf("\nDecrypted Data: %s\n", decrypted_data);return 0;```以上代码使用了OpenSSL库中的AES加密算法。
DES加密C语言实现源代码
void *memcpy( void *dest, const void *src, unsigned char count ){// ASSERT((dest != NULL)&&(src != NULL));unsigned char *temp_dest = (unsigned char *)dest;unsigned char *temp_src = (unsigned char *)src;while(count--) // 不对是否存在重叠区域进行判断{*temp_dest++ = *temp_src++;}return dest;}unsigned char *memset(unsigned char *dst,unsigned char value,unsigned char count) {unsigned char *start = dst;while (count--)*dst++ = value;return(start);}// 初始置换表IPunsigned char IP_Table[64] = { 57,49,41,33,25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7,56,48,40,32,24,16,8,0,58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,46,38,30,22,14,6};//逆初始置换表IP^-1unsigned char IP_1_Table[64] = {39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25,32,0,40,8,48,16,56,24}; //扩充置换表Eunsigned char E_Table[48] = {31, 0, 1, 2, 3, 4,3, 4, 5, 6, 7, 8,7, 8,9,10,11,12,11,12,13,14,15,16,15,16,17,18,19,20,19,20,21,22,23,24,23,24,25,26,27,28,27,28,29,30,31, 0};//置换函数Punsigned char P_Table[32] = {15,6,19,20,28,11,27,16,0,14,22,25,4,17,30,9,1,7,23,13,31,26,2,8,18,12,29,5,21,10,3,24};//S盒unsigned char S[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}}};//置换选择1unsigned char PC_1[56] = {56,48,40,32,24,16,8,0,57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,35,62,54,46,38,30,22,14,6,61,53,45,37,29,21,13,5,60,52,44,36,28,20,12,4,27,19,11,3};//置换选择2unsigned char PC_2[48] = {13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,51,30,36,46,54,29,39,50,44,32,46,43,48,38,55,33,52,45,41,49,35,28,31};// 对左移次数的规定unsigned char MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1}; //字节转换成二进制unsigned char ByteToBit(unsigned char ch, unsigned char bit[8]) {unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*(bit+cnt) = (ch>>cnt)&1;}return 0;}// 二进制转换成字节unsigned char BitToByte(unsigned char bit[8],unsigned char *ch){unsigned char cnt;for(cnt = 0;cnt < 8; cnt++){*ch |= *(bit + cnt)<<cnt;}return 0;}// 将长度为8的字符串转为二进制位串unsigned char Char8ToBit64(unsigned char ch[8],unsigned char bit[64]){unsigned char cnt;for(cnt = 0; cnt < 8; cnt++){ByteToBit(*(ch+cnt),bit+(cnt<<3));}return 0;}// 将二进制位串转为长度为8的字符串unsigned char Bit64ToChar8(unsigned char bit[64],unsigned char ch[8]){unsigned char cnt;memset(ch,0,8);for(cnt = 0; cnt < 8; cnt++){BitToByte(bit+(cnt<<3),ch+cnt);}return 0;}// 密钥置换1unsigned char DES_PC1_Transform(unsigned char key[64], unsigned char tempbts[56]) {unsigned char cnt;for(cnt = 0; cnt < 56; cnt++){tempbts[cnt] = key[PC_1[cnt]];}return 0;}//密钥置换2unsigned char DES_PC2_Transform(unsigned char key[56], unsigned char tempbts[48]) {unsigned char cnt;for(cnt = 0; cnt < 48; cnt++){tempbts[cnt] = key[PC_2[cnt]];}return 0;}//循环左移unsigned char DES_ROL(unsigned char data[56], unsigned char time){unsigned char temp[56];//保存将要循环移动到右边的位memcpy(temp,data,time);memcpy(temp+time,data+28,time);//前28位移动memcpy(data,data+time,28-time);memcpy(data+28-time,temp,time);//后28位移动memcpy(data+28,data+28+time,28-time);memcpy(data+56-time,temp+time,time);return 0;}//IP置换unsigned char DES_IP_Transform(unsigned char data[64]){unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_Table[cnt]];}memcpy(data,temp,64);return 0;}// IP逆置换unsigned char DES_IP_1_Transform(unsigned char data[64]) {unsigned char cnt;unsigned char temp[64];for(cnt = 0; cnt < 64; cnt++){temp[cnt] = data[IP_1_Table[cnt]];}memcpy(data,temp,64);return 0;}//扩展置换unsigned char DES_E_Transform(unsigned char data[48]) {unsigned char cnt;unsigned char temp[48];for(cnt = 0; cnt < 48; cnt++){temp[cnt] = data[E_Table[cnt]];}memcpy(data,temp,48);return 0;}//P置换unsigned char DES_P_Transform(unsigned char data[32]) {unsigned char cnt;unsigned char temp[32];for(cnt = 0; cnt < 32; cnt++){temp[cnt] = data[P_Table[cnt]];}memcpy(data,temp,32);return 0;}// 异或unsigned char DES_XOR(unsigned char R[48], unsigned char L[48] ,unsigned char count) {unsigned char cnt;for(cnt = 0; cnt < count; cnt++){R[cnt] ^= L[cnt];}return 0;}// S盒置换unsigned char DES_SBOX(unsigned char data[48]){unsigned char cnt;unsigned char line,row,output;unsigned char cur1,cur2;for(cnt = 0; cnt < 8; cnt++){cur1 = cnt*6;cur2 = cnt<<2;// 计算在S盒中的行与列line = (data[cur1]<<1) + data[cur1+5];row = (data[cur1+1]<<3) + (data[cur1+2]<<2)+ (data[cur1+3]<<1) + data[cur1+4];output = S[cnt][line][row];// 化为2进制data[cur2] = (output&0X08)>>3;data[cur2+1] = (output&0X04)>>2;data[cur2+2] = (output&0X02)>>1;data[cur2+3] = output&0x01;}return 0;}//交换unsigned char DES_Swap(unsigned char left[32], unsigned char right[32]){unsigned char temp[32];memcpy(temp,left,32);memcpy(left,right,32);memcpy(right,temp,32);return 0;}//生成子密钥unsigned char DES_MakeSubKeys(unsigned char key[64],unsigned char subKeys[16][48]){unsigned char temp[56];unsigned char cnt;DES_PC1_Transform(key,temp);// PC1置换for(cnt = 0; cnt < 16; cnt++) //16轮跌代，产生16个子密钥{DES_ROL(temp,MOVE_TIMES[cnt]);// 循环左移DES_PC2_Transform(temp,subKeys[cnt]);//PC2置换，产生子密钥}return 0;}//加密单个分组unsigned char DES_EncryptBlock(unsigned char plainBlock[8], unsigned char subKeys[16][48], unsigned char cipherBlock[8]){unsigned char plainBits[64];unsigned char copyRight[48];unsigned char cnt;Char8ToBit64(plainBlock,plainBits);//初始置换（IP置换）DES_IP_Transform(plainBits);// 16轮迭代for(cnt = 0; cnt < 16; cnt++){memcpy(copyRight,plainBits+32,32);DES_E_Transform(copyRight); // 将右半部分进行扩展置换，从32位扩展到48位DES_XOR(copyRight,subKeys[cnt],48); // 将右半部分与子密钥进行异或操作DES_SBOX(copyRight); // 异或结果进入S盒，输出32位结果DES_P_Transform(copyRight); // P置换DES_XOR(plainBits,copyRight,32); //将明文左半部分与右半部分进行异或if(cnt != 15){DES_Swap(plainBits,plainBits+32);//最终完成左右部的交换}}DES_IP_1_Transform(plainBits); //逆初始置换（IP^1置换）Bit64ToChar8(plainBits,cipherBlock);return 0;}// 解密单个分组unsigned char DES_DecryptBlock(unsigned char cipherBlock[8], unsigned char subKeys[16][48],unsigned char plainBlock[8]){unsigned char cipherBits[64];unsigned char copyRight[48];short cnt;Char8ToBit64(cipherBlock,cipherBits);//初始置换（IP置换）DES_IP_Transform(cipherBits);// 16轮迭代for(cnt = 15; cnt >= 0; cnt--){memcpy(copyRight,cipherBits+32,32);//将右半部分进行扩展置换，从32位扩展到48位DES_E_Transform(copyRight);// 将右半部分与子密钥进行异或操作DES_XOR(copyRight,subKeys[cnt],48);//异或结果进入S盒，输出32位结果DES_SBOX(copyRight);// P置换DES_P_Transform(copyRight);//将明文左半部分与右半部分进行异或DES_XOR(cipherBits,copyRight,32);if(cnt != 0){// 最终完成左右部的交换DES_Swap(cipherBits,cipherBits+32);}}// 逆初始置换（IP^1置换）DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);return 0;}//加密文件unsigned char DES_Encrypt(unsigned char *keyStr,unsigned char *plainFile,unsigned char *cipherFile){unsigned char keyBlock[8],bKey[64],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_EncryptBlock(plainFile,subKeys,cipherFile);return 1;}//解密文件unsigned char DES_Decrypt(unsigned char *keyStr,unsigned char *cipherFile,unsigned char *plainFile){// unsigned char plainBlock[8],cipherBlock[8],unsigned char bKey[64],keyBlock[8],subKeys[16][48];memcpy(keyBlock,keyStr,8); //设置密钥Char8ToBit64(keyBlock,bKey); //将密钥转换为二进制流DES_MakeSubKeys(bKey,subKeys); //生成子密钥DES_DecryptBlock(cipherFile,subKeys,plainFile);return 1;}/****************************************************************************** ****************** 作者：win2kddk* 说明：3重DES是使用16字节密钥将8字节明文数据块进行3次DES加密和解密。
DES加密算法的C语言实现
DES加密算法的C语言实现DES（Data Encryption Standard）是一种对称密钥加密算法，它的核心思想是将明文分成64位的数据块，并通过一系列的轮次操作对数据块进行加密，最终得到密文。
下面是一种用C语言实现DES加密算法的示例代码：```c#include <stdio.h>unsigned char initial_permutation(unsigned char block)unsigned char result = 0;result ，= (block & 0x80) >> 7;result ，= (block & 0x40) >> 5;result ，= (block & 0x20) >> 3;result ，= (block & 0x10) >> 1;result ，= (block & 0x08) << 1;result ，= (block & 0x04) << 3;result ，= (block & 0x02) << 5;result ，= (block & 0x01) << 7;return result;unsigned char final_permutation(unsigned char block)unsigned char result = 0;result ，= (block & 0x80) >> 7;result ，= (block & 0x40) >> 5;result ，= (block & 0x20) >> 3;result ，= (block & 0x10) >> 1;result ，= (block & 0x08) << 1;result ，= (block & 0x04) << 3;result ，= (block & 0x02) << 5;result ，= (block & 0x01) << 7;return result;void des_encrypt(unsigned char* plaintext, unsigned char* key, unsigned char* ciphertext)unsigned char block;unsigned char round_key;unsigned char i;// Initial Permutationblock = initial_permutation(*plaintext);// Round Permutationfor (i = 0; i < 16; i++)round_key = key[i];block ^= round_key;block = substitution(block);block = permutation(block);}// Final Permutation*ciphertext = final_permutation(block);int maiunsigned char plaintext = 0x55; // 明文unsigned char key[16] = {0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC, 0xDE, 0xEF, 0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10}; // 密钥unsigned char ciphertext;des_encrypt(&plaintext, key, &ciphertext);printf("明文: 0x%02X\n", plaintext);printf("密钥: ");for (unsigned char i = 0; i < 16; i++)printf("%02X ", key[i]);}printf("\n");printf("密文: 0x%02X\n", ciphertext);return 0;```上述代码实现了DES算法的加密功能。
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
};
static char subkeys[16][48];
// 字节组转成位组
void byte_to_bit(char *out, const char *in, int bits)
{
int i;
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
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,
int i;
char *p = tmp;
for (i=0; i<len; i++)
*p++ = in[*table++];
memcpy(out, tmp, len);
}
void xor(char *a, const char *b, int len)
{
while (len--)
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,
32, 0,40, 8,48,16,56,24
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,
40,51,30,36,46,54,29,39,
50,44,32,47,43,48,38,55,
33,52,45,41,49,35,28,31
};
// 左移位数表
static const char des_loop_table[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
18,10, 2,59,51,43,35,
62,54,46,38,30,22,14,
6,61,53,45,37,29,21,
13, 5,60,52,44,36,28,
20,12, 4,27,19,11, 3
// IP置换表
static const char des_ip_table[64] = {
57,49,41,33,25,17, 9, 1,
59,51,43,35,27,19,11, 3,
61,53,45,37,29,21,13, 5,
// pc1选位表
static const char des_pc1_table[56] = {
56,48,40,32,24,16, 8,
0,57,49,41,33,25,17,
9, 1,58,50,42,34,26,
};
// pc2选位表
static const char des_pc2_table[48] = {
13,16,10,23, 0, 4, 2,27,
14, 5,20, 9,22,18,11, 3,
25, 7,15, 6,26,19,12, 1,
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,
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,
};
// E 选位表
static const char des_e_table[48] = {
31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9,10,11,12,
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,
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,
c = (in[1]<<3) | (in[2]<<2) | (in[3]<<1) | in[4];
byte_to_bit(out, &des_s_box[b][r][c], 4);
}
}
// 循环左移
void des_left_loop(char *in, int loop)
};
// p选位表
static const char des_p_table[32] = {
15, 6,19,20,28,11,27,16,
0,14,22,25, 4,17,30, 9,
1, 7,23,13,31,26, 2, 8,
for(i=0; i<bits; i++)
out[(i&~7)>>3] |= (*in++) << (i&7);
}
// 置换
void des_transform(char *out, char *in, const char *table, int len)
{
static char tmp[64];
// S盒
static const char des_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,
};
// IP-1 逆置换表
static const char des_ip_r_table[64] = {
39, 7,47,15,55,23,63,31,
38, 6,46,14,54,22,62,30,
37, 5,45,13,53,21,61,29,
for(i=0; i<bits; i++)
*out++ = (in[(i&~7)>>3]>>(i&7)) & 1;
}
// 位组转成字节组
void bit_to_byte(char *out, const char *in, int bits)
{
int i;
memset(out,0,((bits+7)&~7)>>3);
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,
11,12,13,14,15,16,
15,16,17,18,19,20,
19,20,21,22,23,24,
23,24,25,26,27,28,
27,28,29,30,31, 0
};
//S6
12, 1,10,15, 9, 2, 6, 8, 0,12, 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,
//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,
*a++ ^= *b++;
}
// S盒
void des_s_transform(char out[32], const char in[48])