1、void *memcpy( void *dest, const void *src, unsigned char count ) / ASSERT(dest != 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,uns
2、igned char value,unsigned char count)unsigned char *start = dst;while (count-)*dst+ = value;return(start);/ 初始置换表 IPunsigned char IP_Table64 = 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,
3、4,62,54,46,38,30,22,14,6;/逆初始置换表 IP-1unsigned char IP_1_Table64 = 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_Table48 = 31, 0, 1, 2, 3, 4,
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_Table32 = 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 S8416 =/ S1 14,4,13,1,2,15,11,8,3,10,6,
5、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
6、,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,/S5 2,12
7、,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,
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、,9,0,3,5,6,11;/置换选择 1unsigned char PC_156 = 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_248 = 13,16,10,23,0,4,2,27,14,5,20,9,22,18,11,3,25,7,15,6,26,19,12,1,40,5
10、1,30,36,46,54,29,39,50,44,32,46,43,48,38,55,33,52,45,41,49,35,28,31;/ 对左移次数的规定unsigned char MOVE_TIMES16 = 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 bit8)unsigned char cnt;for(cnt = 0;cnt cnt)return 0;/ 二进制转换成字节 unsigned char BitToByte(unsigned
11、char bit8,unsigned char *ch)unsigned char cnt;for(cnt = 0;cnt 3;datacur2+1 = (outputdatacur2+2 = (outputdatacur2+3 = output return 0;/交换 unsigned char DES_Swap(unsigned char left32, unsigned char right32)unsigned char temp32;memcpy(temp,left,32); memcpy(left,right,32); memcpy(right,temp,32);return 0
12、; /生成子密钥unsigned char DES_MakeSubKeys(unsigned char key64,unsigned char subKeys1648)unsigned char temp56;unsigned char cnt;DES_PC1_Transform(key,temp);/ PC1 置换for(cnt = 0; 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_X
13、OR(copyRight,subKeyscnt,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（IP1 置换）DES_IP_1_Transform(cipherBits);Bit64ToChar8(cipherBits,plainBlock);re
14、turn 0;/加密文件unsigned char DES_Encrypt(unsigned char *keyStr,unsigned char *plainFile,unsigned char *cipherFile)unsigned char keyBlock8,bKey64,subKeys1648;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,ci
15、pherFile); return 1;/解密文件 unsigned char DES_Decrypt(unsigned char *keyStr,unsigned char *cipherFile,unsigned char *plainFile)/ unsigned char plainBlock8,cipherBlock8,unsigned char bKey64,keyBlock8,subKeys1648;memcpy(keyBlock,keyStr,8); /设置密钥 Char8ToBit64(keyBlock,bKey); /将密钥转换为二进制流DES_MakeSubKeys(bK
16、ey,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。*/unsigned char DES_key16;void DEC3_Encrypt(unsigned char *in_buf, unsigned char *miwen)unsigned char buf18,buf28;DES_Encrypt(DES_Decrypt(DES_Encrypt(void
17、DEC3_Decrypt(unsigned char *miwen, unsigned char *out_buf)unsigned char buf18,buf28;DES_Decrypt(DES_Encrypt(DES_Decrypt(void DES3_Test(void)unsigned char in_buf8 = “ABCDEFGH“;unsigned char miwen8=0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00;unsigned char out_buf8=0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00;memcpy(DES_key,“0123456789abcdef“,16);/3DES 的密钥是 128 位的，这里只是设置密钥的 DEMO。DEC3_Encrypt(in_buf,miwen); /3DES 加密DEC3_Decrypt(miwen,out_buf); /3DES 解密
