在開發過程中經常會射擊到對數據的加密處理，常用的加密方式有Aes和Des，Aes/Des加密速度快，適合大量數據，Des容易破解,一般用3重Des即TripleDes。
在項目開發時從網上找了很多例子，大部分只能單平臺運行，或者文件不全，本人這樣的新手來說對于加密算法還是望而生畏的。后來找了一些資料，然后整合了一下別人的代碼（加密核心代碼的原作者:黃雙全，如有侵權請告知，會及時處理），實現了3DES-ECB的加密方法。
最喜歡的就是：直接上代碼
1、頭文件des.h
#ifndef _DES_H_#define _DES_H_#include <string>#include <sstream>using namespace std;//為了提高程序效率，把這兩個位操作功能定義在宏。//讀取緩沖區的指定位.#define GET_BIT(p_array, bit_index) /((p_array[(bit_index) >> 3] >> (7 - ((bit_index) & 0x07))) & 0x01)//設置緩沖區的指定位.#define SET_BIT(p_array, bit_index, bit_val) /if (1 == (bit_val)) /{/p_array[(bit_index) >> 3] |= 0x01 << (7 - ((bit_index) & 0x07));/}/else/{/p_array[(bit_index) >> 3] &= ~(0x01 << (7 - ((bit_index) & 0x07)));/}//加解密標識，這兩個標識涉及到對表的讀取位置,//必須保證DES_ENCRYPT = 0 DES_DECRYPT = 1typedef enum { DES_ENCRYPT = 0, DES_DECRYPT = 1} DES_MODE;//keytypedef enum { //1key模式 等同于des KEY_16, //2key模式 key1 ＝ key3 KEY_32, //3key模式 KEY_48, KEY_ERROR} KEYMODE;class Des {PRivate: std::string deskey;private: //字符輸出處理 void print_binary(char * tip, unsigned char * buff, unsigned char bits); void print_hex(char * tip, unsigned char * buff, unsigned char bytes); /////////////////////////////////////////////////////////////// // 函 數 名 : des // 函數功能 : DES加解密 // 處理過程 : 根據標準的DES加密算法用輸入的64位密鑰對64位密文進行加/解密 // 并將加/解密結果存儲到p_output里 // 時 間 : 2006年9月2日 // 返 回 值 : // 參數說明 : const char * p_data 輸入, 加密時輸入明文, 解密時輸入密文, 64位(8字節) // const char * p_key 輸入, 密鑰, 64位(8字節) // char * p_output 輸出, 加密時輸出密文, 解密時輸入明文, 64位(8字節) // unsigned char mode 0 加密 1 解密 /////////////////////////////////////////////////////////////// void des(const char * p_data, const char * p_key, const char * p_output, DES_MODE mode); //對兩塊大小相同的內存區進行異或 //異或結果保存到第一塊內存 //unsigned char * p_buf_1 內存區1 //const unsigned char * p_buf_2 內存區2 //unsigned char bytes 內存區大小(單位：字節) void Xor(unsigned char * p_buf_1, const unsigned char * p_buf_2, unsigned char bytes); //將緩沖區從第bit_start位到第bit_end進行循環左移 //offset只能是1，2 void move_left(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, unsigned char offset); //將緩沖區從第bit_start位到第bit_end進行循環右移 //offset只能是1，2 void move_right(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, unsigned char offset); //緩沖區移位 //offset大于0時左移 //offset小于0時右移 void move_bits(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, char offset); //通用置換函數, bits <= 64 //p_input與p_output不能指向同一個地址，否則置換會出錯。 void Permutation(unsigned char * p_input, unsigned char * p_output, const unsigned char * Table, unsigned char bits); //獲取從bit_s為起始的第1, 6 位組成行 unsigned char S_GetLine(unsigned char * p_data_ext, unsigned char bit_s); //獲取從bit_s為起始的第2,3,4,5位組成列 unsigned char S_GetRow(unsigned char * p_data_ext, unsigned char bit_s); /************************************************************************ *功能：字符串轉換為16進制表示，每兩位為一組 ************************************************************************/ unsigned char* str_to_hex(const std::string& str); /************************************************************************ *功能：獲得3DES分組的key ************************************************************************/ unsigned char *getKey1(std::string key); unsigned char *getKey2(std::string key); unsigned char *getKey3(std::string key); /************************************************************************ *功能：數組清空 ************************************************************************/ void clearBuff(char *buff, int length); /*編碼 DataByte [in]輸入的數據長度,以字節為單位 */ std::string base64Encode(const unsigned char* Data, int DataByte); /*解碼 DataByte [in]輸入的數據長度,以字節為單位 OutByte [out]輸出的數據長度,以字節為單位,請不要通過返回值計算 輸出數據的長度 */ std::string base64Decode(const char* Data, int DataByte, int& OutByte); //功能：URL字符轉換 unsigned char ToHex(unsigned char x); unsigned char FromHex(unsigned char x); //功能：URL-ENCODE編碼 std::string UrlEncode(const std::string& str); //功能：URL-DECODE解碼 std::string UrlDecode(const std::string& str); //替換字符串 std::string replaceAllSubStr(string &str, string &oldStr, string &newStr); //檢查key的長度，返回加密模式 KEYMODE checkKey(); KEYMODE checkKey(std::string key);public: Des() { } ; Des(std::string key) { deskey = key; } ; ~Des() { deskey = nullptr; } ; /************************************************************************ *功能：3DES-ECB加密 ************************************************************************/ std::string desEncrypt(std::string str); /************************************************************************ *功能：3DES-ECB解密 ************************************************************************/ std::string desDecrypt(std::string str);};#endif //#ifndef _DES_H_2、實現des.cpp
#include "des.h"http:// 初始置換const unsigned char Table_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 };// 末置換const unsigned char Table_InverseIP[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 };// 擴展置換const unsigned char Table_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 };// 密鑰初始置換const unsigned char Table_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 };// 左右移運算const signed char Table_Move[2][16] = {//加密左移 { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }, //解密右移 { 0, -1, -2, -2, -2, -2, -2, -2, -1, -2, -2, -2, -2, -2, -2, -1 } };// 密鑰壓縮置換const unsigned char Table_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 };// S盒const unsigned char Table_SBOX[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 };// P盒置換const unsigned char Table_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 };//檢查key的長度，返回加密模式KEYMODE Des::checkKey() { if (deskey.length() != 0) { if (deskey.length() != 32 && deskey.length() != 48) { printf("key輸入不正確，請輸入32位key或者48位key"); return KEY_ERROR; } if (deskey.length() % 2 != 0) { printf("請檢查輸入的位數是否是偶數位"); return KEY_ERROR; } if (deskey.length() == 32) { return KEY_32; } if (deskey.length() == 48) { return KEY_48; } } else { return KEY_ERROR; } return KEY_ERROR;}KEYMODE Des::checkKey(std::string key) { deskey = key; if (deskey.length() != 32 && deskey.length() != 48) { printf("key輸入不正確，請輸入32位key或者48位key"); return KEY_ERROR; } if (deskey.length() % 2 != 0) { printf("請檢查輸入的位數是否是偶數位"); return KEY_ERROR; } if (deskey.length() == 32) { return KEY_32; } if (deskey.length() == 48) { return KEY_48; } return KEY_ERROR;}void Des::print_binary(char * tip, unsigned char * buff, unsigned char bits) { unsigned char bit_index = 0; printf("/r/n****** start %s ******/r/n", tip); for (bit_index = 0; bit_index < bits; bit_index++) { printf("%d", (buff[bit_index >> 3] >> (7 - (bit_index % 8))) & 0x01); if ((bit_index + 1) % 4 == 0) { printf(" "); } if ((bit_index + 1) % 64 == 0) { printf("/r/n"); } } printf("/r/n****** end %s ******/r/n", tip);}void Des::print_hex(char * tip, unsigned char * buff, unsigned char bytes) { unsigned char byte_index = 0; printf("/r/n %s", tip); for (byte_index = 0; byte_index < bytes; byte_index++) { //LOGI("0x%0.2X ", buff[byte_index]); }}//對兩塊大小相同的內存區進行異或//異或結果保存到第一塊內存//unsigned char * p_buf_1 內存區1//const unsigned char * p_buf_2 內存區2//unsigned char bytes 內存區大小(單位：字節)void Des::Xor(unsigned char * p_buf_1, const unsigned char * p_buf_2, unsigned char bytes) { while (bytes > 0) { bytes--; p_buf_1[bytes] ^= p_buf_2[bytes]; }}//將緩沖區從第bit_start位到第bit_end進行循環左移//offset只能是1，2//本段代碼還可以優化。void Des::move_left(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, unsigned char offset) { unsigned char b_val = 0; unsigned char b_tmp1 = 0; unsigned char b_tmp2 = 0; //讀取bit_start位 b_tmp1 = GET_BIT(p_input, bit_start); b_tmp2 = GET_BIT(p_input, bit_start + 1); //循環左移offset位 for (; bit_start <= (bit_end - offset); bit_start++) { b_val = GET_BIT(p_input, bit_start + offset); SET_BIT(p_input, bit_start, b_val); } //將bit_start開始的offset位移到bit_end后頭來 if (1 == offset) { SET_BIT(p_input, bit_end, b_tmp1); } else { SET_BIT(p_input, bit_end, b_tmp2); SET_BIT(p_input, bit_end - 1, b_tmp1); }}//將緩沖區從第bit_start位到第bit_end進行循環右移//offset只能是1，2//本段代碼在性能上還可以優化。void Des::move_right(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, unsigned char offset) { unsigned char b_val = 0; unsigned char b_tmp1 = 0; unsigned char b_tmp2 = 0; //讀取bit_end位 b_tmp1 = GET_BIT(p_input, bit_end); b_tmp2 = GET_BIT(p_input, bit_end - 1); //循環左移offset位 for (; bit_end >= (bit_start + offset); bit_end--) { b_val = GET_BIT(p_input, bit_end - offset); SET_BIT(p_input, bit_end, b_val); } //將bit_end倒數的offset位移到bit_start來 if (1 == offset) { SET_BIT(p_input, bit_start, b_tmp1); } else { SET_BIT(p_input, bit_start, b_tmp2); SET_BIT(p_input, bit_start + 1, b_tmp1); }}//緩沖區移位//offset大于0時左移//offset小于0時右移void Des::move_bits(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, char offset) { if (0 < offset) //左移 { move_left(p_input, bit_start, bit_end, offset); } else if (0 > offset) //右移 { move_right(p_input, bit_start, bit_end, -offset); }}//通用置換函數, bits <= 64//p_input與p_output不能指向同一個地址，否則置換會出錯。void Des::Permutation(unsigned char * p_input, unsigned char * p_output, const unsigned char * Table, unsigned char bits) { unsigned char b_val = false; unsigned char bit_index = 0; for (bit_index = 0; bit_index < bits; bit_index++) { b_val = GET_BIT(p_input, Table[bit_index] - 1); SET_BIT(p_output, bit_index, b_val); }}//獲取從bit_s為起始的第1, 6 位組成行unsigned char Des::S_GetLine(unsigned char * p_data_ext, unsigned char bit_s) { return (GET_BIT(p_data_ext, bit_s + 0) << 1) + GET_BIT(p_data_ext, bit_s + 5);}//獲取從bit_s為起始的第2,3,4,5位組成列unsigned char Des::S_GetRow(unsigned char * p_data_ext, unsigned char bit_s) { unsigned char row; //2,3,4,5位組成列 row = GET_BIT(p_data_ext, bit_s + 1); row <<= 1; row += GET_BIT(p_data_ext, bit_s + 2); row <<= 1; row += GET_BIT(p_data_ext, bit_s + 3); row <<= 1; row += GET_BIT(p_data_ext, bit_s + 4); return row;}///////////////////////////////////////////////////////////////// 函 數 名 : des// 函數功能 : DES加解密// 處理過程 : 根據標準的DES加密算法用輸入的64位密鑰對64位密文進行加/解密// 并將加/解密結果存儲到p_output里// 時 間 : 2006年9月2日// 返 回 值 :// 參數說明 : const char * p_data 輸入, 加密時輸入明文, 解密時輸入密文, 64位(8字節)// const char * p_key 輸入, 密鑰, 64位(8字節)// char * p_output 輸出, 加密時輸出密文, 解密時輸入明文, 64位(8字節)// unsigned char mode DES_ENCRYPT 加密 DES_DECRYPT 解密///////////////////////////////////////////////////////////////void Des::des(const char * p_data, const char * p_key, const char * p_output, DES_MODE mode) { unsigned char loop = 0; //16輪運算的循環計數器 unsigned char key_tmp[8]; //密鑰運算時存儲中間結果 unsigned char sub_key[6]; //用于存儲子密鑰 unsigned char * p_left; const char* p_right; unsigned char p_right_ext[8]; //R[i]經過擴展置換生成的48位數據(6字節), 及最終結果的存儲 unsigned char p_right_s[4]; //經過S_BOX置換后的32位數據(4字節) unsigned char s_loop = 0; //S_BOX置換的循環計數器 //密鑰第一次縮小換位, 得到一組56位的密鑰數據 Permutation((unsigned char*) p_key, key_tmp, Table_PC1, 56); //明文初始化置換 Permutation((unsigned char*) p_data, (unsigned char*) p_output, Table_IP, 64); p_left = (unsigned char*) p_output; //L0 p_right = &p_output[4]; //R0 for (loop = 0; loop < 16; loop++) { //把縮進小后的把這56位分為左28位和右28位, //對左28位和右28位分別循環左/右移, 得到一組新數據 //加解密操作時只在移位時有差異 move_bits(key_tmp, 0, 27, Table_Move[mode][loop]); move_bits(key_tmp, 28, 55, Table_Move[mode][loop]); //密鑰第二次縮小換位，得到一組子48位的子密鑰 Permutation(key_tmp, sub_key, Table_PC2, 48); //R0擴展置換 Permutation((unsigned char*) p_right, p_right_ext, Table_E, 48); //將R0擴展置換后得到的48位數據(6字節)與子密鑰進行異或 Xor(p_right_ext, sub_key, 6); //S_BOX置換 for (s_loop = 0; s_loop < 4; s_loop++) { unsigned char s_line = 0; unsigned char s_row = 0; unsigned char s_bit = s_loop * 12; s_line = S_GetLine(p_right_ext, s_bit); s_row = S_GetRow(p_right_ext, s_bit); p_right_s[s_loop] = Table_SBOX[s_loop * 2][s_line][s_row]; s_bit += 6; s_line = S_GetLine(p_right_ext, s_bit); s_row = S_GetRow(p_right_ext, s_bit); p_right_s[s_loop] <<= 4; p_right_s[s_loop] += Table_SBOX[(s_loop * 2) + 1][s_line][s_row]; } //P置換 Permutation(p_right_s, p_right_ext, Table_P, 32); Xor(p_right_ext, p_left, 4); memcpy(p_left, (unsigned char*) p_right, 4); memcpy((unsigned char*) p_right, p_right_ext, 4); } memcpy(&p_right_ext[4], p_left, 4); memcpy(p_right_ext, p_right, 4); //最后再進行一次逆置換, 得到最終加密結果 Permutation(p_right_ext, (unsigned char*) p_output, Table_InverseIP, 64);}/************************************************************************ *功能：字符串轉換為16進制表示，每兩位為一組 ************************************************************************/unsigned char* Des::str_to_hex(const std::string& str) { unsigned char *buff = NULL; int size = sizeof(unsigned char *) * str.length() / 2; buff = (unsigned char*) malloc(size); memset((void*) buff, 0, size); std::stringstream ss; ss << std::hex; for (int i = 0; i != str.size() / 2; ++i) { int val = 0; ss << str.substr(i * 2, 2); ss >> val; buff[i] = val; ss.clear(); } return buff;}/************************************************************************ *功能：獲得3DES分組的key ************************************************************************/unsigned char *Des::getKey1(std::string key) { unsigned char *key1; key1 = str_to_hex(key.substr(0, 16)); return key1;}unsigned char *Des::getKey2(std::string key) { unsigned char *key2; key2 = str_to_hex(key.substr(16, 32)); return key2;}unsigned char *Des::getKey3(std::string key) { unsigned char *key3; key3 = str_to_hex(key.substr(32, 48)); return key3;}/************************************************************************ *功能：數組清空 ************************************************************************/void Des::clearBuff(char *buff, int length) { for (int i = 0; i < length; i++) { buff[i] = '/0'; }}std::string Des::base64Encode(const unsigned char* Data, int DataByte) { //編碼表 const char EncodeTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; //返回值 std::string strEncode; unsigned char Tmp[4] = { 0 }; int LineLength = 0; for (int i = 0; i < (int) (DataByte / 3); i++) { Tmp[1] = *Data++; Tmp[2] = *Data++; Tmp[3] = *Data++; strEncode += EncodeTable[Tmp[1] >> 2]; strEncode += EncodeTable[((Tmp[1] << 4) | (Tmp[2] >> 4)) & 0x3F]; strEncode += EncodeTable[((Tmp[2] << 2) | (Tmp[3] >> 6)) & 0x3F]; strEncode += EncodeTable[Tmp[3] & 0x3F]; if (LineLength += 4, LineLength == 76) { strEncode += "/r/n"; LineLength = 0; } } //對剩余數據進行編碼 int Mod = DataByte % 3; if (Mod == 1) { Tmp[1] = *Data++; strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2]; strEncode += EncodeTable[((Tmp[1] & 0x03) << 4)]; strEncode += "=="; } else if (Mod == 2) { Tmp[1] = *Data++; Tmp[2] = *Data++; strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2]; strEncode += EncodeTable[((Tmp[1] & 0x03) << 4) | ((Tmp[2] & 0xF0) >> 4)]; strEncode += EncodeTable[((Tmp[2] & 0x0F) << 2)]; strEncode += "="; } return strEncode;}std::string Des::base64Decode(const char* Data, int DataByte, int& OutByte) { //解碼表 const char DecodeTable[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, // '+' 0, 0, 0, 63, // '/' 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9' 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // 'A'-'Z' 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // 'a'-'z' }; //返回值 std::string strDecode; int nValue; int i = 0; while (i < DataByte) { if (*Data != '/r' && *Data != '/n') { nValue = DecodeTable[*Data++] << 18; nValue += DecodeTable[*Data++] << 12; strDecode += (nValue & 0x00FF0000) >> 16; OutByte++; if (*Data != '=') { nValue += DecodeTable[*Data++] << 6; strDecode += (nValue & 0x0000FF00) >> 8; OutByte++; if (*Data != '=') { nValue += DecodeTable[*Data++]; strDecode += nValue & 0x000000FF; OutByte++; } } i += 4; } else // 回車換行,跳過 { Data++; i++; } } return strDecode;}/************************************************************************ *功能：URL字符轉換 ************************************************************************/unsigned char Des::ToHex(unsigned char x) { return x > 9 ? x + 55 : x + 48;}unsigned char Des::FromHex(unsigned char x) { unsigned char y = NULL; if (x >= 'A' && x <= 'Z') y = x - 'A' + 10; else if (x >= 'a' && x <= 'z') y = x - 'a' + 10; else if (x >= '0' && x <= '9') y = x - '0'; return y;}/************************************************************************ *功能：URL-ENCODE編碼 ************************************************************************/std::string Des::UrlEncode(const std::string& str) { std::string strTemp = ""; size_t length = str.length(); for (size_t i = 0; i < length; i++) { if (isalnum((unsigned char) str[i]) || (str[i] == '-') || (str[i] == '_') || (str[i] == '.') || (str[i] == '~')) strTemp += str[i]; else if (str[i] == ' ') strTemp += "+"; else { strTemp += '%'; strTemp += ToHex((unsigned char) str[i] >> 4); strTemp += ToHex((unsigned char) str[i] % 16); } } return strTemp;}/************************************************************************ *功能：URL-DECODE解碼 ************************************************************************/std::string Des::UrlDecode(const std::string& str) { std::string strTemp = ""; size_t length = str.length(); for (size_t i = 0; i < length; i++) { if (str[i] == '+') strTemp += ' '; else if (str[i] == '%') { //assert(i + 2 < length); unsigned char high = FromHex((unsigned char) str[++i]); unsigned char low = FromHex((unsigned char) str[++i]); strTemp += high * 16 + low; } else strTemp += str[i]; } return strTemp;}//替換字符串std::string Des::replaceAllSubStr(string &str, string &oldStr, string &newStr) { while (true) { string::size_type pos(0); if ((pos = str.find(oldStr)) != string::npos) { str.replace(pos, oldStr.length(), newStr); } else { break; } } return str;}/************************************************************************ *功能：3DES-ECB加密 ************************************************************************/std::string Des::desEncrypt(std::string str) { auto mode = checkKey(deskey); if (mode == KEY_ERROR) { return nullptr; } int block = 0; int len = str.length(); std::string encode = ""; std::string result = ""; char *key1 = NULL; char *key2 = NULL; char *key3 = NULL; if (mode == KEY_16) { key1 = (char*) getKey1(deskey); key2 = (char*) getKey1(deskey); key3 = (char*) getKey1(deskey); } if (mode == KEY_32) { key1 = (char*) getKey1(deskey); key2 = (char*) getKey2(deskey); key3 = (char*) getKey1(deskey); } if (mode == KEY_48) { key1 = (char*) getKey1(deskey); key2 = (char*) getKey2(deskey); key3 = (char*) getKey3(deskey); } if (len % 8 == 0) { block = len / 8; } else { block = len / 8 + 1; } //LOGI("block = %d", block); unsigned char *result1 = NULL; int size = sizeof(unsigned char *) * 8 * block + 1; result1 = (unsigned char*) malloc(size); memset(result1, 0, size); //3DES 加密 char en_out_put[9] = { 0 }; char en_data[9] = { 0 }; for (int i = 0; i < block; i++) { clearBuff(en_data, 9); if (i == block - 1) { if (len % 8 == 0) { memcpy(en_data, str.c_str() + (i * 8), 8); } else { memcpy(en_data, str.c_str() + (i * 8), len % 8); } } else { memcpy(en_data, str.c_str() + (i * 8), 8); } //LOGI("en_data = %s", en_data); des(en_data, key1, en_out_put, DES_ENCRYPT); des(en_out_put, key2, en_data, DES_DECRYPT); des(en_data, key3, en_out_put, DES_ENCRYPT); //result.append(en_out_put); for (int n = 0; n < 8; n++) { result1[(i * 8) + n] = en_out_put[n]; } } encode = base64Encode((unsigned char*) result1, block * 8); //encode = base64Encode((unsigned char*) result.c_str(), block * 8); free(key1); free(key2); free(key3); free(result1); return encode;}/************************************************************************ *功能：3DES-ECB解密 ************************************************************************/std::string Des::desDecrypt(std::string str) { auto mode = checkKey(deskey); if (mode == KEY_ERROR) { return nullptr; } char *key1 = NULL; char *key2 = NULL; char *key3 = NULL; if (mode == KEY_16) { key1 = (char*) getKey1(deskey); key2 = (char*) getKey1(deskey); key3 = (char*) getKey1(deskey); } if (mode == KEY_32) { key1 = (char*) getKey1(deskey); key2 = (char*) getKey2(deskey); key3 = (char*) getKey1(deskey); } if (mode == KEY_48) { key1 = (char*) getKey1(deskey); key2 = (char*) getKey2(deskey); key3 = (char*) getKey3(deskey); } int OutByte = 0; std::string decode = ""; std::string result = ""; decode = base64Decode(str.c_str(), str.length(), OutByte); //如果加密字符串經過解密后長度不為8的倍數，則返回NULL if(OutByte % 8 != 0) { //LOGI("OutByte = %d", OutByte); return "isWrongInput"; } int block = 0; block = OutByte / 8; //3DES 加密 char en_out_put[9] = { 0 }; char en_data[9] = { 0 }; for (int i = 0; i < block; i++) { memcpy(en_out_put, decode.c_str() + (i * 8), 8); des(en_out_put, key3, en_data, DES_DECRYPT); des(en_data, key2, en_out_put, DES_ENCRYPT); des(en_out_put, key1, en_data, DES_DECRYPT); result += en_data; } free(key1); free(key2); free(key3); return result;}3、使用方法
//十六進制的key，每16位為一組，共三組密鑰組合為48位長度，如果之傳入16位，將是des加密，32位2des，48位為3des加密，加密后的字符串已經經過base64編碼const char *TRIPLE_DES_KEY="000000000000000000000000000000000000000000000000";auto my3Des=new des(TRIPLE_DES_KEY);//加密my3Des->desEncrypt("明文");//解密my3Des->desDecrypt("密文");4、下載地址
3des加解密下載
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