C/C++: 3DES-ECB模式加密,可以与C#和Java互通

2/22/2017来源:ASP.NET技巧人气:3426

在开发过程中经常会射击到对数据的加密处理,常用的加密方式有Aes和Des,Aes/Des加密速度快,适合大量数据,Des容易破解,一般用3重Des即TripleDes。

在项目开发时从网上找了很多例子,大部分只能单平台运行,或者文件不全,本人这样的新手来说对于加密算法还是望而生畏的。后来找了一些资料,然后整合了一下别人的代码(加密核心代码的原作者:黄双全,如有侵权请告知,会及时处理),实现了3DES-ECB的加密方法。

最喜欢的就是:直接上代码

1、头文件des.h

#ifndef _DES_H_ #define _DES_H_ #include <string> #include <sstream> using namespace std; //为了提高程序效率,把这两个位操作功能定义在宏。 //读取缓冲区的指定位. #define GET_BIT(p_array, bit_index) \ ((p_array[(bit_index) >> 3] >> (7 - ((bit_index) & 0x07))) & 0x01) //设置缓冲区的指定位. #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)));\ } //加解密标识,这两个标识涉及到对表的读取位置, //必须保证DES_ENCRYPT = 0 DES_DECRYPT = 1 typedef enum { DES_ENCRYPT = 0, DES_DECRYPT = 1 } DES_MODE; //key typedef 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: //字符输出处理 void print_binary(char * tip, unsigned char * buff, unsigned char bits); void print_hex(char * tip, unsigned char * buff, unsigned char bytes); /////////////////////////////////////////////////////////////// // 函 数 名 : des // 函数功能 : DES加解密 // 处理过程 : 根据标准的DES加密算法用输入的64位密钥对64位密文进行加/解密 // 并将加/解密结果存储到p_output里 // 时 间 : 2006年9月2日 // 返 回 值 : // 参数说明 : const char * p_data 输入, 加密时输入明文, 解密时输入密文, 64位(8字节) // const char * p_key 输入, 密钥, 64位(8字节) // char * p_output 输出, 加密时输出密文, 解密时输入明文, 64位(8字节) // 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); //对两块大小相同的内存区进行异或 //异或结果保存到第一块内存 //unsigned char * p_buf_1 内存区1 //const unsigned char * p_buf_2 内存区2 //unsigned char bytes 内存区大小(单位:字节) void Xor(unsigned char * p_buf_1, const unsigned char * p_buf_2, unsigned char bytes); //将缓冲区从第bit_start位到第bit_end进行循环左移 //offset只能是1,2 void move_left(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, unsigned char offset); //将缓冲区从第bit_start位到第bit_end进行循环右移 //offset只能是1,2 void move_right(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, unsigned char offset); //缓冲区移位 //offset大于0时左移 //offset小于0时右移 void move_bits(unsigned char * p_input, unsigned char bit_start, unsigned char bit_end, char offset); //通用置换函数, bits <= 64 //p_input与p_output不能指向同一个地址,否则置换会出错。 void Permutation(unsigned char * p_input, unsigned char * p_output, const unsigned char * Table, unsigned char bits); //获取从bit_s为起始的第1, 6 位组成行 unsigned char S_GetLine(unsigned char * p_data_ext, unsigned char bit_s); //获取从bit_s为起始的第2,3,4,5位组成列 unsigned char S_GetRow(unsigned char * p_data_ext, unsigned char bit_s); /************************************************************************ *功能:字符串转换为16进制表示,每两位为一组 ************************************************************************/ unsigned char* str_to_hex(const std::string& str); /************************************************************************ *功能:获得3DES分组的key ************************************************************************/ unsigned char *getKey1(std::string key); unsigned char *getKey2(std::string key); unsigned char *getKey3(std::string key); /************************************************************************ *功能:数组清空 ************************************************************************/ void clearBuff(char *buff, int length); /*编码 DataByte [in]输入的数据长度,以字节为单位 */ std::string base64Encode(const unsigned char* Data, int DataByte); /*解码 DataByte [in]输入的数据长度,以字节为单位 OutByte [out]输出的数据长度,以字节为单位,请不要通过返回值计算 输出数据的长度 */ std::string base64Decode(const char* Data, int DataByte, int& OutByte); //功能:URL字符转换 unsigned char ToHex(unsigned char x); unsigned char FromHex(unsigned char x); //功能:URL-ENCODE编码 std::string UrlEncode(const std::string& str); //功能:URL-DECODE解码 std::string UrlDecode(const std::string& str); //替换字符串 std::string replaceAllSubStr(string &str, string &oldStr, string &newStr); //检查key的长度,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、实现des.cpp

#include "des.h" // 初始置换 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 }; // 末置换 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 }; // 扩展置换 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 }; // 密钥初始置换 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 }; // 左右移运算 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 } }; // 密钥压缩置换 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盒置换 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 }; //检查key的长度,返回加密模式 KEYMODE Des::checkKey() { if (deskey.length() != 0) { if (deskey.length() != 32 && deskey.length() != 48) { printf("key输入不正确,请输入32位key或者48位key"); return KEY_ERROR; } if (deskey.length() % 2 != 0) { printf("请检查输入的位数是否是偶数位"); 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输入不正确,请输入32位key或者48位key"); return KEY_ERROR; } if (deskey.length() % 2 != 0) { printf("请检查输入的位数是否是偶数位"); 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]); } } //对两块大小相同的内存区进行异或 //异或结果保存到第一块内存 //unsigned char * p_buf_1 内存区1 //const unsigned char * p_buf_2 内存区2 //unsigned char bytes 内存区大小(单位:字节) 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]; } } //将缓冲区从第bit_start位到第bit_end进行循环左移 //offset只能是1,2 //本段代码还可以优化。 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; //读取bit_start位 b_tmp1 = GET_BIT(p_input, bit_start); b_tmp2 = GET_BIT(p_input, bit_start + 1); //循环左移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); } //将bit_start开始的offset位移到bit_end后头来 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); } } //将缓冲区从第bit_start位到第bit_end进行循环右移 //offset只能是1,2 //本段代码在性能上还可以优化。 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; //读取bit_end位 b_tmp1 = GET_BIT(p_input, bit_end); b_tmp2 = GET_BIT(p_input, bit_end - 1); //循环左移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); } //将bit_end倒数的offset位移到bit_start来 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); } } //缓冲区移位 //offset大于0时左移 //offset小于0时右移 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); } } //通用置换函数, bits <= 64 //p_input与p_output不能指向同一个地址,否则置换会出错。 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); } } //获取从bit_s为起始的第1, 6 位组成行 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); } //获取从bit_s为起始的第2,3,4,5位组成列 unsigned char Des::S_GetRow(unsigned char * p_data_ext, unsigned char bit_s) { unsigned char row; //2,3,4,5位组成列 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 数 名 : des // 函数功能 : DES加解密 // 处理过程 : 根据标准的DES加密算法用输入的64位密钥对64位密文进行加/解密 // 并将加/解密结果存储到p_output里 // 时 间 : 2006年9月2日 // 返 回 值 : // 参数说明 : const char * p_data 输入, 加密时输入明文, 解密时输入密文, 64位(8字节) // const char * p_key 输入, 密钥, 64位(8字节) // char * p_output 输出, 加密时输出密文, 解密时输入明文, 64位(8字节) // 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轮运算的循环计数器 unsigned char key_tmp[8]; //密钥运算时存储中间结果 unsigned char sub_key[6]; //用于存储子密钥 unsigned char * p_left; const char* p_right; unsigned char p_right_ext[8]; //R[i]经过扩展置换生成的48位数据(6字节), 及最终结果的存储 unsigned char p_right_s[4]; //经过S_BOX置换后的32位数据(4字节) unsigned char s_loop = 0; //S_BOX置换的循环计数器 //密钥第一次缩小换位, 得到一组56位的密钥数据 Permutation((unsigned char*) p_key, key_tmp, Table_PC1, 56); //明文初始化置换 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++) { //把缩进小后的把这56位分为左28位和右28位, //对左28位和右28位分别循环左/右移, 得到一组新数据 //加解密操作时只在移位时有差异 move_bits(key_tmp, 0, 27, Table_Move[mode][loop]); move_bits(key_tmp, 28, 55, Table_Move[mode][loop]); //密钥第二次缩小换位,得到一组子48位的子密钥 Permutation(key_tmp, sub_key, Table_PC2, 48); //R0扩展置换 Permutation((unsigned char*) p_right, p_right_ext, Table_E, 48); //将R0扩展置换后得到的48位数据(6字节)与子密钥进行异或 Xor(p_right_ext, sub_key, 6); //S_BOX置换 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置换 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); //最后再进行一次逆置换, 得到最终加密结果 Permutation(p_right_ext, (unsigned char*) p_output, Table_InverseIP, 64); } /************************************************************************ *功能:字符串转换为16进制表示,每两位为一组 ************************************************************************/ 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:获得3DES分组的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:数组清空 ************************************************************************/ 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) { //编码表 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; } } //对剩余数据进行编码 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) { //解码表 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 // 回车换行,跳过 { Data++; i++; } } return strDecode; } /************************************************************************ *功能:URL字符转换 ************************************************************************/ 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编码 ************************************************************************/ 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解码 ************************************************************************/ 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; } //替换字符串 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); //如果加密字符串经过解密后长度不为8的倍数,则返回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

//十六进制的key,每16位为一组,共三组密钥组合为48位长度,如果之传入16位,将是des加密,32位2des,48位为3des加密,加密后的字符串已经经过base64编码 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、下载地址

3des加解密下载