工厂方法模式
#include <iostream> #include <fstream> #include <bitset> #include <string> using namespace std; //define the type of data typedef unsigned char byte; typedef unsigned short word16;//16bit typedef unsigned long word32;//32bit //抽象产品类——PW类 class PW { public: void show() {} }; //具体产品类——IDEA类： class IDEA :public PW { public: void setKey(byte in[]); void setPlainText(byte in[]); word16 invMul(word16 x); word16 mul(word16 x, word16 y); void encryption(word16 in[], word16 out[], word16 *Ek); void enc(); void show(); private: void getEncRoundKey(word16 *encRoundKey); void getDecRoundKey(word16 *EK, word16 DK[]); byte key[16]; word16 cipherText[4]; word16 plainText[4]; word16 deCipherText[4]; word16 encRoundKey[52]; word16 decRoundKey[52]; void checkRoundKey(); }; void IDEA::setPlainText(byte in[]) { //8个byte类型数据变成4个word16的数据 int i; for (i = 0; i < 8; i += 2) { plainText[i / 2] = (in[i] << 8) + in[i + 1]; } } void IDEA::setKey(byte in[]) { int i; for (i = 0; i < 16; i++) { key[i] = in[i]; } getEncRoundKey(encRoundKey); getDecRoundKey(encRoundKey, decRoundKey); } void IDEA::getEncRoundKey(word16 *encRoundKey) { int i, j; for (i = 0, j = 0; j < 8; j++) { encRoundKey[j] = (key[i] << 8) + key[i + 1]; i += 2; } for (i = 0; j < 52; j++) { i++; encRoundKey[i + 7] = encRoundKey[i & 7] << 9 | encRoundKey[(i + 1) & 7] >> 7; encRoundKey += (i & 8); i &= 7; } } void IDEA::getDecRoundKey(word16 *EK, word16 DK[]) { int i; word16 temp[52]; word16 t1, t2, t3; word16 *p = temp + 52; t1 = invMul(*EK++); t2 = -*EK++; t3 = -*EK++; *--p = invMul(*EK++); *--p = t3; *--p = t2; *--p = t1; for (i = 0; i < 7; i++) { t1 = *EK++; *--p = *EK++; *--p = t1; t1 = invMul(*EK++); t2 = -*EK++; t3 = -*EK++; *--p = invMul(*EK++); *--p = t2; *--p = t3; *--p = t1; } t1 = *EK++; *--p = *EK++; *--p = t1; t1 = invMul(*EK++); t2 = -*EK++; t3 = -*EK++; *--p = invMul(*EK++); *--p = t3; *--p = t2; *--p = t1; for (i = 0, p = temp; i < 52; i++) { *EK++ = *p; *p++ = 0; } } word16 IDEA::invMul(word16 x) { word16 t0, t1; word16 q, y; if (x <= 1) { return x;//0和1的逆是本身 } t1 = word16(0x10001L / x); y = word16(0x10001L % x); if (y == 1) { return (1 - t1) & 0xFFFF; } t0 = 1; do { q = x / y; x = x % y; t0 += q * t1; if (x == 1) { return t0; } q = y / x; y = y % x; t1 += q * t0; } while (y != 1); return (1 - t1) & 0xFFFF; } void IDEA::encryption(word16 in[], word16 out[], word16 * EK) { word16 x1, x2, x3, x4, t1, t2; x1 = in[0]; x2 = in[1]; x3 = in[2]; x4 = in[3]; int r = 8; do { x1 = mul(x1, *EK++); x2 += *EK++; x3 += *EK++; x4 = mul(x4, *EK++); t2 = x1 ^ x3; t1 = x2 ^ x4; t2 = mul(t2, *EK++); t1 = t1 + t2; t1 = mul(t1, *EK++); t2 = t1 + t2; x1 ^= t1; x4 ^= t2; t2 ^= x2; x2 = x3 ^ t1; x3 = t2; } while (--r); x1 = mul(x1, *EK++); *out++ = x1; *out++ = x3 + *EK++; *out++ = x2 + *EK++; x4 = mul(x4, *EK++); *out = x4; } word16 IDEA::mul(word16 x, word16 y) { word32 p; p = (word32)x * y; if (p) { y = p & 0xFFFF; x = p >> 16; return (y - x) + (y < x); } else if (x) { return 1 - y; } else { return 1 - x; } } void IDEA::enc() { encryption(plainText, cipherText, encRoundKey); encryption(cipherText, deCipherText, decRoundKey); } void IDEA::show() { //ofstream fout("E:\test.txt"); cout << "输入文本:" << endl; int i; for (i = 0; i < 16; i++) { cout << hex << int(key[i]) << " "; } cout << endl; cout << "初始文本:" << endl; for (i = 0; i < 4; i++) { cout << hex << plainText[i] << " "; } cout << endl; cout << "密文:" << endl; for (i = 0; i < 4; i++) { cout << hex << cipherText[i] << " "; } cout << endl; cout << "解密文本:" << endl; for (i = 0; i < 4; i++) { cout << hex << deCipherText[i] << " "; } cout << endl; } /****************************DES算法********************************/ bitset<64> key; // 64位密钥 bitset<48> subKey[16]; // 存放16轮子密钥 // 初始置换表 int IP[] = { 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 }; // 结尾置换表 int IP_1[] = { 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 }; /*------------------下面是生成密钥所用表-----------------*/ // 密钥置换表，将64位密钥变成56位 int PC_1[] = { 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 }; // 压缩置换，将56位密钥压缩成48位子密钥 int PC_2[] = { 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 }; // 每轮左移的位数 int shiftBits[] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; /*------------------下面是密码函数 f 所用表-----------------*/ // 扩展置换表，将 32位 扩展至 48位 int E[] = { 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 }; // S盒，每个S盒是4x16的置换表，6位 -> 4位 int S_BOX[8][4][16] = { { {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} } }; // P置换，32位 -> 32位 int P[] = { 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 }; /**********************************************************************/ /* */ /* 下面是DES算法实现 */ /* */ /**********************************************************************/ /** * 密码函数f，接收32位数据和48位子密钥，产生一个32位的输出 */ bitset<32> f(bitset<32> R, bitset<48> k) { bitset<48> expandR; // 第一步：扩展置换，32 -> 48 for (int i = 0; i < 48; ++i) expandR[47 - i] = R[32 - E[i]]; // 第二步：异或 expandR = expandR ^ k; // 第三步：查找S_BOX置换表 bitset<32> output; int x = 0; for (int i = 0; i < 48; i = i + 6) { int row = expandR[47 - i] * 2 + expandR[47 - i - 5]; int col = expandR[47 - i - 1] * 8 + expandR[47 - i - 2] * 4 + expandR[47 - i - 3] * 2 + expandR[47 - i - 4]; int num = S_BOX[i / 6][row][col]; bitset<4> binary(num); output[31 - x] = binary[3]; output[31 - x - 1] = binary[2]; output[31 - x - 2] = binary[1]; output[31 - x - 3] = binary[0]; x += 4; } // 第四步：P-置换，32 -> 32 bitset<32> tmp = output; for (int i = 0; i < 32; ++i) output[31 - i] = tmp[32 - P[i]]; return output; } /** * 对56位密钥的前后部分进行左移 */ bitset<28> leftShift(bitset<28> k, int shift) { bitset<28> tmp = k; for (int i = 27; i >= 0; --i) { if (i - shift < 0) k[i] = tmp[i - shift + 28]; else k[i] = tmp[i - shift]; } return k; } /** * 生成16个48位的子密钥 */ void generateKeys() { bitset<56> realKey; bitset<28> left; bitset<28> right; bitset<48> compressKey; // 去掉奇偶标记位，将64位密钥变成56位 for (int i = 0; i < 56; ++i) realKey[55 - i] = key[64 - PC_1[i]]; // 生成子密钥，保存在 subKeys[16] 中 for (int round = 0; round < 16; ++round) { // 前28位与后28位 for (int i = 28; i < 56; ++i) left[i - 28] = realKey[i]; for (int i = 0; i < 28; ++i) right[i] = realKey[i]; // 左移 left = leftShift(left, shiftBits[round]); right = leftShift(right, shiftBits[round]); // 压缩置换，由56位得到48位子密钥 for (int i = 28; i < 56; ++i) realKey[i] = left[i - 28]; for (int i = 0; i < 28; ++i) realKey[i] = right[i]; for (int i = 0; i < 48; ++i) compressKey[47 - i] = realKey[56 - PC_2[i]]; subKey[round] = compressKey; } } /** * 工具函数：将char字符数组转为二进制 */ bitset<64> charToBitset(const char s[8]) { bitset<64> bits; for (int i = 0; i < 8; ++i) for (int j = 0; j < 8; ++j) bits[i * 8 + j] = ((s[i] >> j) & 1); return bits; } /** * DES加密 */ bitset<64> encrypt(bitset<64>& plain) { bitset<64> cipher; bitset<64> currentBits; bitset<32> left; bitset<32> right; bitset<32> newLeft; // 第一步：初始置换IP for (int i = 0; i < 64; ++i) currentBits[63 - i] = plain[64 - IP[i]]; // 第二步：获取 Li 和 Ri for (int i = 32; i < 64; ++i) left[i - 32] = currentBits[i]; for (int i = 0; i < 32; ++i) right[i] = currentBits[i]; // 第三步：共16轮迭代 for (int round = 0; round < 16; ++round) { newLeft = right; right = left ^ f(right, subKey[round]); left = newLeft; } // 第四步：合并L16和R16，注意合并为 R16L16 for (int i = 0; i < 32; ++i) cipher[i] = left[i]; for (int i = 32; i < 64; ++i) cipher[i] = right[i - 32]; // 第五步：结尾置换IP-1 currentBits = cipher; for (int i = 0; i < 64; ++i) cipher[63 - i] = currentBits[64 - IP_1[i]]; // 返回密文 return cipher; } /** * DES解密 */ bitset<64> decrypt(bitset<64>& cipher) { bitset<64> plain; bitset<64> currentBits; bitset<32> left; bitset<32> right; bitset<32> newLeft; // 第一步：初始置换IP for (int i = 0; i < 64; ++i) currentBits[63 - i] = cipher[64 - IP[i]]; // 第二步：获取 Li 和 Ri for (int i = 32; i < 64; ++i) left[i - 32] = currentBits[i]; for (int i = 0; i < 32; ++i) right[i] = currentBits[i]; // 第三步：共16轮迭代（子密钥逆序应用） for (int round = 0; round < 16; ++round) { newLeft = right; right = left ^ f(right, subKey[15 - round]); left = newLeft; } // 第四步：合并L16和R16，注意合并为 R16L16 for (int i = 0; i < 32; ++i) plain[i] = left[i]; for (int i = 32; i < 64; ++i) plain[i] = right[i - 32]; // 第五步：结尾置换IP-1 currentBits = plain; for (int i = 0; i < 64; ++i) plain[63 - i] = currentBits[64 - IP_1[i]]; // 返回明文 return plain; } //具体产品类——DES类： class DES :public PW { public: DES() { cout << "DES加密算法：" << endl; show(); } void show() { string s = "贾亚赛"; string k = "789987"; bitset<64> temp; fstream file1; bitset<64> plain = charToBitset(s.c_str()); key = charToBitset(k.c_str()); // 生成16个子密钥 generateKeys(); // 密文写入 a.txt bitset<64> cipher = encrypt(plain); file1.open(".//a.txt", ios::binary | ios::out); file1.write((char*)&cipher, sizeof(cipher)); file1.close(); // 读文件 a.txt file1.open(".//a.txt", ios::binary | ios::in); file1.read((char*)&temp, sizeof(temp)); cout << "密文： " << (char*)&temp << endl; file1.close(); // 解密，并写入文件 b.txt bitset<64> temp_plain = decrypt(cipher); cout << "解密： " << (char*)&temp_plain << endl; } }; //抽象工厂类——PWFactory类 class PWFactory { public: virtual PW producePW() = 0; }; //具体工厂类——DESFactory类 class DESFactory :public PWFactory { public: virtual PW producePW() { DES des; return des; } }; //具体工厂类——IDEAFactory类 class IDEAFactory :public PWFactory { public: virtual PW producePW() { IDEA idea; byte key[16] = { 0x10, 0x1A, 0x0C, 0x0B, 0x01, 0x11, 0x09, 0x07, 0x32, 0xA1, 0xB3, 0x06, 0x23, 0x12, 0xD3, 0xF1 }; idea.setKey(key); byte plainText[8] = { 0xA7, 0x95, 0x87, 0x23, 0x1F, 0x2C, 0x6D, 0x73 }; idea.setPlainText(plainText); cout << "IDEA算法：" << endl; idea.enc(); idea.show(); return idea; } }; int main() { PW pw; PWFactory *f; //f=new DESFactory(); f = new IDEAFactory(); pw = f->producePW(); return 0; }
#include <iostream>#include <fstream>#include <bitset>#include <string>using namespace std;//define the type of datatypedef unsigned char byte;typedef unsigned short word16;//16bittypedef unsigned long word32;//32bit//抽象产品类——PW类class PW {public:void show() {}};//具体产品类——IDEA类：class IDEA :public PW{public:void setKey(byte in[]);void setPlainText(byte in[]);word16 invMul(word16 x);word16 mul(word16 x, word16 y);void encryption(word16 in[], word16 out[], word16 *Ek);void enc();void show();
private:void getEncRoundKey(word16 *encRoundKey);void getDecRoundKey(word16 *EK, word16 DK[]);byte key[16];word16 cipherText[4];word16 plainText[4];word16 deCipherText[4];word16 encRoundKey[52];word16 decRoundKey[52];void checkRoundKey();};
void IDEA::setPlainText(byte in[]) {//8个byte类型数据变成4个word16的数据int i;for (i = 0; i < 8; i += 2) {plainText[i / 2] = (in[i] << 8) + in[i + 1];}}
void IDEA::setKey(byte in[]) {int i;for (i = 0; i < 16; i++) {key[i] = in[i];}getEncRoundKey(encRoundKey);getDecRoundKey(encRoundKey, decRoundKey);}
void IDEA::getEncRoundKey(word16 *encRoundKey) {int i, j;for (i = 0, j = 0; j < 8; j++) {encRoundKey[j] = (key[i] << 8) + key[i + 1];i += 2;}for (i = 0; j < 52; j++) {i++;encRoundKey[i + 7] = encRoundKey[i & 7] << 9 | encRoundKey[(i + 1) & 7] >> 7;encRoundKey += (i & 8);i &= 7;}}
void IDEA::getDecRoundKey(word16 *EK, word16 DK[]) {int i;word16 temp[52];word16 t1, t2, t3;word16 *p = temp + 52;t1 = invMul(*EK++);t2 = -*EK++;t3 = -*EK++;*--p = invMul(*EK++);*--p = t3;*--p = t2;*--p = t1;for (i = 0; i < 7; i++) {t1 = *EK++;*--p = *EK++;*--p = t1;t1 = invMul(*EK++);t2 = -*EK++;t3 = -*EK++;*--p = invMul(*EK++);*--p = t2;*--p = t3;*--p = t1;}t1 = *EK++;*--p = *EK++;*--p = t1;t1 = invMul(*EK++);t2 = -*EK++;t3 = -*EK++;*--p = invMul(*EK++);*--p = t3;*--p = t2;*--p = t1;for (i = 0, p = temp; i < 52; i++) {*EK++ = *p;*p++ = 0;}}
word16 IDEA::invMul(word16 x) {word16 t0, t1;word16 q, y;if (x <= 1) {return x;//0和1的逆是本身}t1 = word16(0x10001L / x);y = word16(0x10001L % x);if (y == 1) {return (1 - t1) & 0xFFFF;}t0 = 1;do {q = x / y;x = x % y;t0 += q * t1;if (x == 1) {return t0;}q = y / x;y = y % x;t1 += q * t0;} while (y != 1);return (1 - t1) & 0xFFFF;}
void IDEA::encryption(word16 in[], word16 out[], word16 * EK) {word16 x1, x2, x3, x4, t1, t2;x1 = in[0];x2 = in[1];x3 = in[2];x4 = in[3];int r = 8;do {x1 = mul(x1, *EK++);x2 += *EK++;x3 += *EK++;x4 = mul(x4, *EK++);t2 = x1 ^ x3;t1 = x2 ^ x4;t2 = mul(t2, *EK++);t1 = t1 + t2;t1 = mul(t1, *EK++);t2 = t1 + t2;x1 ^= t1;x4 ^= t2;t2 ^= x2;x2 = x3 ^ t1;x3 = t2;} while (--r);x1 = mul(x1, *EK++);*out++ = x1;*out++ = x3 + *EK++;*out++ = x2 + *EK++;x4 = mul(x4, *EK++);*out = x4;}
word16 IDEA::mul(word16 x, word16 y) {word32 p;p = (word32)x * y;if (p) {y = p & 0xFFFF;x = p >> 16;return (y - x) + (y < x);}else if (x) {return 1 - y;}else {return 1 - x;}}
void IDEA::enc() {encryption(plainText, cipherText, encRoundKey);encryption(cipherText, deCipherText, decRoundKey);}
void IDEA::show() {//ofstream fout("E:\test.txt");cout << "输入文本:" << endl;int i;for (i = 0; i < 16; i++) {cout << hex << int(key[i]) << " ";}cout << endl;cout << "初始文本:" << endl;for (i = 0; i < 4; i++) {cout << hex << plainText[i] << " ";}cout << endl;cout << "密文:" << endl;for (i = 0; i < 4; i++) {cout << hex << cipherText[i] << " ";}cout << endl;cout << "解密文本:" << endl;for (i = 0; i < 4; i++) {cout << hex << deCipherText[i] << " ";}cout << endl;}
/****************************DES算法********************************/
bitset<64> key; // 64位密钥bitset<48> subKey[16]; // 存放16轮子密钥
// 初始置换表int IP[] = { 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 };
// 结尾置换表int IP_1[] = { 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 };
/*------------------下面是生成密钥所用表-----------------*/
// 密钥置换表，将64位密钥变成56位int PC_1[] = { 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 };
// 压缩置换，将56位密钥压缩成48位子密钥int PC_2[] = { 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 };
// 每轮左移的位数int shiftBits[] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };
/*------------------下面是密码函数 f 所用表-----------------*/
// 扩展置换表，将 32位 扩展至 48位int E[] = { 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 };
// S盒，每个S盒是4x16的置换表，6位 -> 4位int S_BOX[8][4][16] = {{{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}}};
// P置换，32位 -> 32位int P[] = { 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 };
/**********************************************************************//* *//* 下面是DES算法实现 *//* *//**********************************************************************/
/** * 密码函数f，接收32位数据和48位子密钥，产生一个32位的输出 */bitset<32> f(bitset<32> R, bitset<48> k){bitset<48> expandR;// 第一步：扩展置换，32 -> 48for (int i = 0; i < 48; ++i)expandR[47 - i] = R[32 - E[i]];// 第二步：异或expandR = expandR ^ k;// 第三步：查找S_BOX置换表bitset<32> output;int x = 0;for (int i = 0; i < 48; i = i + 6){int row = expandR[47 - i] * 2 + expandR[47 - i - 5];int col = expandR[47 - i - 1] * 8 + expandR[47 - i - 2] * 4 + expandR[47 - i - 3] * 2 + expandR[47 - i - 4];int num = S_BOX[i / 6][row][col];bitset<4> binary(num);output[31 - x] = binary[3];output[31 - x - 1] = binary[2];output[31 - x - 2] = binary[1];output[31 - x - 3] = binary[0];x += 4;}// 第四步：P-置换，32 -> 32bitset<32> tmp = output;for (int i = 0; i < 32; ++i)output[31 - i] = tmp[32 - P[i]];return output;}
/** * 对56位密钥的前后部分进行左移 */bitset<28> leftShift(bitset<28> k, int shift){bitset<28> tmp = k;for (int i = 27; i >= 0; --i){if (i - shift < 0)k[i] = tmp[i - shift + 28];elsek[i] = tmp[i - shift];}return k;}
/** * 生成16个48位的子密钥 */void generateKeys(){bitset<56> realKey;bitset<28> left;bitset<28> right;bitset<48> compressKey;// 去掉奇偶标记位，将64位密钥变成56位for (int i = 0; i < 56; ++i)realKey[55 - i] = key[64 - PC_1[i]];// 生成子密钥，保存在 subKeys[16] 中for (int round = 0; round < 16; ++round){// 前28位与后28位for (int i = 28; i < 56; ++i)left[i - 28] = realKey[i];for (int i = 0; i < 28; ++i)right[i] = realKey[i];// 左移left = leftShift(left, shiftBits[round]);right = leftShift(right, shiftBits[round]);// 压缩置换，由56位得到48位子密钥for (int i = 28; i < 56; ++i)realKey[i] = left[i - 28];for (int i = 0; i < 28; ++i)realKey[i] = right[i];for (int i = 0; i < 48; ++i)compressKey[47 - i] = realKey[56 - PC_2[i]];subKey[round] = compressKey;}}
/** * 工具函数：将char字符数组转为二进制 */bitset<64> charToBitset(const char s[8]){bitset<64> bits;for (int i = 0; i < 8; ++i)for (int j = 0; j < 8; ++j)bits[i * 8 + j] = ((s[i] >> j) & 1);return bits;}
/** * DES加密 */bitset<64> encrypt(bitset<64>& plain){bitset<64> cipher;bitset<64> currentBits;bitset<32> left;bitset<32> right;bitset<32> newLeft;// 第一步：初始置换IPfor (int i = 0; i < 64; ++i)currentBits[63 - i] = plain[64 - IP[i]];// 第二步：获取 Li 和 Rifor (int i = 32; i < 64; ++i)left[i - 32] = currentBits[i];for (int i = 0; i < 32; ++i)right[i] = currentBits[i];// 第三步：共16轮迭代for (int round = 0; round < 16; ++round){newLeft = right;right = left ^ f(right, subKey[round]);left = newLeft;}// 第四步：合并L16和R16，注意合并为 R16L16for (int i = 0; i < 32; ++i)cipher[i] = left[i];for (int i = 32; i < 64; ++i)cipher[i] = right[i - 32];// 第五步：结尾置换IP-1currentBits = cipher;for (int i = 0; i < 64; ++i)cipher[63 - i] = currentBits[64 - IP_1[i]];// 返回密文return cipher;}
/** * DES解密 */bitset<64> decrypt(bitset<64>& cipher){bitset<64> plain;bitset<64> currentBits;bitset<32> left;bitset<32> right;bitset<32> newLeft;// 第一步：初始置换IPfor (int i = 0; i < 64; ++i)currentBits[63 - i] = cipher[64 - IP[i]];// 第二步：获取 Li 和 Rifor (int i = 32; i < 64; ++i)left[i - 32] = currentBits[i];for (int i = 0; i < 32; ++i)right[i] = currentBits[i];// 第三步：共16轮迭代（子密钥逆序应用）for (int round = 0; round < 16; ++round){newLeft = right;right = left ^ f(right, subKey[15 - round]);left = newLeft;}// 第四步：合并L16和R16，注意合并为 R16L16for (int i = 0; i < 32; ++i)plain[i] = left[i];for (int i = 32; i < 64; ++i)plain[i] = right[i - 32];// 第五步：结尾置换IP-1currentBits = plain;for (int i = 0; i < 64; ++i)plain[63 - i] = currentBits[64 - IP_1[i]];// 返回明文return plain;}//具体产品类——DES类：class DES :public PW {public:DES() {cout << "DES加密算法：" << endl;show();}void show() {string s = "贾亚赛";string k = "789987";bitset<64> temp;fstream file1;bitset<64> plain = charToBitset(s.c_str());key = charToBitset(k.c_str());// 生成16个子密钥generateKeys();// 密文写入 a.txtbitset<64> cipher = encrypt(plain);file1.open(".//a.txt", ios::binary | ios::out);file1.write((char*)&cipher, sizeof(cipher));file1.close();
// 读文件 a.txtfile1.open(".//a.txt", ios::binary | ios::in);file1.read((char*)&temp, sizeof(temp));cout << "密文： " << (char*)&temp << endl;file1.close();
// 解密，并写入文件 b.txtbitset<64> temp_plain = decrypt(cipher);cout << "解密： " << (char*)&temp_plain << endl;}};//抽象工厂类——PWFactory类class PWFactory {public:virtual PW producePW() = 0;};//具体工厂类——DESFactory类class DESFactory :public PWFactory {public:virtual PW producePW() {DES des;return des;}};//具体工厂类——IDEAFactory类class IDEAFactory :public PWFactory {public:virtual PW producePW() {IDEA idea;byte key[16] = { 0x10, 0x1A, 0x0C, 0x0B, 0x01, 0x11, 0x09, 0x07, 0x32, 0xA1,0xB3, 0x06, 0x23, 0x12, 0xD3, 0xF1 };idea.setKey(key);byte plainText[8] = { 0xA7, 0x95, 0x87, 0x23, 0x1F, 0x2C, 0x6D, 0x73 };idea.setPlainText(plainText);cout << "IDEA算法：" << endl;idea.enc();idea.show();return idea;}};
int main(){PW pw;PWFactory *f;//f=new DESFactory();f = new IDEAFactory();pw = f->producePW();return 0;
}
