C++实现md5加密（兼容中文）

说明：由于调用了windows api来对中文进行了处理，所以暂仅支持windows

#include <iostream>#include <windows.h>using namespace std;typedef unsigned char uchar;typedef unsigned long ulong;//步函数#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))#define H(x, y, z) ((x) ^ (y) ^ (z))#define I(x, y, z) ((y) ^ ((x) | (~z)))//循环左移 #define ROL(x, n) (((x) << (n)) | ((x) >> (32-(n))))//  四轮操作#define FF(a, b, c, d, mj, s, ti) { (a) += F ((b), (c), (d)) + (mj) + ti; (a) = ROL ((a), (s)); (a) += (b);}#define GG(a, b, c, d, mj, s, ti) { (a) += G ((b), (c), (d)) + (mj) + ti; (a) = ROL ((a), (s)); (a) += (b);}#define HH(a, b, c, d, mj, s, ti) { (a) += H ((b), (c), (d)) + (mj) + ti; (a) = ROL ((a), (s)); (a) += (b);}#define II(a, b, c, d, mj, s, ti) { (a) += I ((b), (c), (d)) + (mj) + ti; (a) = ROL ((a), (s)); (a) += (b);}class MD5{public:MD5(const string &str);const uchar* getDigest();// 获取生成的摘要 string outstr(int);// 返回字符串 private:void generate(const uchar *input, int length); void change(const uchar block[64]);// 四轮操作 void encode(const ulong *input, uchar *output, int length);// uchar to ulong void decode(const uchar *input, ulong *output, int length); // ulong to ucharulong reg[4];// ABCDulong count[2];    // 长度扩充 uchar buffer[64];// 输入buffer uchar digest[16];// 生成的摘要 bool end_flag;// 结束标志 static const uchar padding[64];static const char hex[16];};const uchar MD5::padding[64] = { 0x80 };// 初始化附加填充 1000 0000， 设置最高位为1 const char MD5::hex[16] = {'0', '1', '2', '3','4', '5', '6', '7','8', '9', 'a', 'b','c', 'd', 'e', 'f'};MD5::MD5(const string &str){end_flag = false;count[0] = count[1] = 0; // 重置bits个数// 初始化链接变量（高位->低位） /* * 错误的赋值，注意高低位 reg[0] = 0x01234567;reg[1] = 0x89abcdef;reg[2] = 0xfedcba98;reg[3] = 0x76543210;*/ reg[0] = 0x67452301;reg[1] = 0xefcdab89;reg[2] = 0x98badcfe;reg[3] = 0x10325476;generate((uchar*)const_cast<char*>(str.c_str()), str.length());}/** * 获取摘要 */const uchar* MD5::getDigest() {if (! end_flag) {end_flag = true;uchar bits[8];ulong _reg[4];// 旧reg ulong _count[2];// 旧countulong index, padLen;memcpy(_reg, reg, 16);// 复制内存，将_reg内存地址的起始位置开始拷贝16字节到reg起始位置中memcpy(_count, count, 8);// 将原始消息长度以64比特（8字节）复制到count后 encode(count, bits, 8);/* Pad out to 56 mod 64. */index = (ulong)((count[0] >> 3) & 0x3f);padLen = (index < 56) ? (56 - index) : (120 - index);generate(padding, padLen);generate(bits, 8);encode(reg, digest, 16);/* 重新存储reg和count */memcpy(reg, _reg, 16);memcpy(count, _count, 8);}return digest;}void MD5::generate(const uchar *input, int length) {ulong i, index, partLen;end_flag = false;index = (ulong)((count[0] >> 3) & 0x3f);if((count[0] += ((ulong)length << 3)) < ((ulong)length << 3))count[1]++;count[1] += ((ulong)length >> 29);partLen = 64 - index;if(length >= partLen) {memcpy(&buffer[index], input, partLen);change(buffer);//分组处理，四轮操作 for (i = partLen; i + 63 < length; i += 64)change(&input[i]);index = 0;} else {i = 0;}// 内存拷贝 memcpy(&buffer[index], &input[i], length-i);}/** * 四轮变换操作  */void MD5::change(const uchar block[64]) {ulong a = reg[0],   b = reg[1],   c = reg[2],   d = reg[3],   m[16];decode(block, m, 64);// uchar 转 ulong FF (a, b, c, d, m[0], 7, 0xd76aa478); FF (d, a, b, c, m[1], 12, 0xe8c7b756); FF (c, d, a, b, m[2], 17, 0x242070db); FF (b, c, d, a, m[3], 22, 0xc1bdceee); FF (a, b, c, d, m[4], 7, 0xf57c0faf); FF (d, a, b, c, m[5], 12, 0x4787c62a);FF (c, d, a, b, m[6], 17, 0xa8304613);FF (b, c, d, a, m[7], 22, 0xfd469501);FF (a, b, c, d, m[8], 7, 0x698098d8); FF (d, a, b, c, m[9], 12, 0x8b44f7af); FF (c, d, a, b, m[10], 17, 0xffff5bb1);FF (b, c, d, a, m[11], 22, 0x895cd7be);FF (a, b, c, d, m[12], 7, 0x6b901122); FF (d, a, b, c, m[13], 12, 0xfd987193);FF (c, d, a, b, m[14], 17, 0xa679438e);FF (b, c, d, a, m[15], 22, 0x49b40821);GG (a, b, c, d, m[1], 5, 0xf61e2562);GG (d, a, b, c, m[6], 9, 0xc040b340);GG (c, d, a, b, m[11], 14, 0x265e5a51);GG (b, c, d, a, m[0], 20, 0xe9b6c7aa); GG (a, b, c, d, m[5], 5, 0xd62f105d); GG (d, a, b, c, m[10], 9,  0x2441453);GG (c, d, a, b, m[15], 14, 0xd8a1e681); GG (b, c, d, a, m[4], 20, 0xe7d3fbc8);GG (a, b, c, d, m[9], 5, 0x21e1cde6); GG (d, a, b, c, m[14], 9, 0xc33707d6); GG (c, d, a, b, m[3], 14, 0xf4d50d87); GG (b, c, d, a, m[8], 20, 0x455a14ed); GG (a, b, c, d, m[13], 5, 0xa9e3e905); GG (d, a, b, c, m[2], 9, 0xfcefa3f8); GG (c, d, a, b, m[7], 14, 0x676f02d9); GG (b, c, d, a, m[12], 20, 0x8d2a4c8a); HH (a, b, c, d, m[5], 4, 0xfffa3942);HH (d, a, b, c, m[8], 11, 0x8771f681);HH (c, d, a, b, m[11], 16, 0x6d9d6122);HH (b, c, d, a, m[14], 23, 0xfde5380c);HH (a, b, c, d, m[1], 4, 0xa4beea44);HH (d, a, b, c, m[4], 11, 0x4bdecfa9);HH (c, d, a, b, m[7], 16, 0xf6bb4b60);HH (b, c, d, a, m[10], 23, 0xbebfbc70);HH (a, b, c, d, m[13], 4, 0x289b7ec6);HH (d, a, b, c, m[0], 11, 0xeaa127fa);HH (c, d, a, b, m[3], 16, 0xd4ef3085);HH (b, c, d, a, m[6], 23,  0x4881d05);HH (a, b, c, d, m[9], 4, 0xd9d4d039);HH (d, a, b, c, m[12], 11, 0xe6db99e5);HH (c, d, a, b, m[15], 16, 0x1fa27cf8);HH (b, c, d, a, m[2], 23, 0xc4ac5665);II (a, b, c, d, m[0], 6, 0xf4292244);II (d, a, b, c, m[7], 10, 0x432aff97);II (c, d, a, b, m[14], 15, 0xab9423a7);II (b, c, d, a, m[5], 21, 0xfc93a039);II (a, b, c, d, m[12], 6, 0x655b59c3);II (d, a, b, c, m[3], 10, 0x8f0ccc92); II (c, d, a, b, m[10], 15, 0xffeff47d);II (b, c, d, a, m[1], 21, 0x85845dd1);II (a, b, c, d, m[8], 6, 0x6fa87e4f);II (d, a, b, c, m[15], 10, 0xfe2ce6e0);II (c, d, a, b, m[6], 15, 0xa3014314);II (b, c, d, a, m[13], 21, 0x4e0811a1);II (a, b, c, d, m[4], 6, 0xf7537e82);II (d, a, b, c, m[11], 10, 0xbd3af235);II (c, d, a, b, m[2], 15, 0x2ad7d2bb);II (b, c, d, a, m[9], 21, 0xeb86d391);reg[0] += a;reg[1] += b;reg[2] += c;reg[3] += d;}/** * ulong 转 uchar  */void MD5::encode(const ulong *input, uchar *output, int length) {for(int i=0, j=0; j<length; i++, j+=4) {output[j]= (uchar)(input[i] & 0xff);output[j+1] = (uchar)((input[i] >> 8) & 0xff);output[j+2] = (uchar)((input[i] >> 16) & 0xff);output[j+3] = (uchar)((input[i] >> 24) & 0xff);}}/** * uchar 转 ulong  */void MD5::decode(const uchar *input, ulong *output, int length) {for(int i=0, j=0; j<length; i++, j+=4) {output[i] = ((ulong)input[j]) | (((ulong)input[j+1]) << 8) | (((ulong)input[j+2]) << 16) | (((ulong)input[j+3]) << 24);}}string MD5::outstr(int length = 32) {const uchar *input = getDigest();string str;//str.reserve(length << 1);for(int i = 0; i < 16; i++) {int t = input[i];int a = t / 16;int b = t % 16;str.append(1, hex[a]);str.append(1, hex[b]);}if(16 == length){str = str.substr(9-1, 16);}return str;}/** * GB2312转Unicode，解决中文出错问题 * 此处代码来源于网络。 */char* G2U(const char* gb2312){int len = MultiByteToWideChar(CP_ACP, 0, gb2312, -1, NULL, 0);wchar_t* wstr = new wchar_t[len+1];memset(wstr, 0, len+1);MultiByteToWideChar(CP_ACP, 0, gb2312, -1, wstr, len);len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, NULL, 0, NULL, NULL);char* str = new char[len+1];memset(str, 0, len+1);WideCharToMultiByte(CP_UTF8, 0, wstr, -1, str, len, NULL, NULL);if(wstr) delete[] wstr;return str;}static void MessageBox(const char * pszMsg, const char * pszTitle){int bufflen = MultiByteToWideChar(CP_UTF8, 0, pszMsg, -1, NULL, 0);WCHAR* wideMsg = new WCHAR[bufflen + 1];memset(wideMsg, 0, sizeof(WCHAR)* (bufflen + 1));MultiByteToWideChar(CP_UTF8, 0, pszMsg, -1, wideMsg, bufflen);bufflen = MultiByteToWideChar(CP_UTF8, 0, pszTitle, -1, NULL, 0);WCHAR* wideTitle = new WCHAR[bufflen + 1];memset(wideTitle, 0, sizeof(WCHAR)* (bufflen + 1));MultiByteToWideChar(CP_UTF8, 0, pszTitle, -1, wideTitle, bufflen);delete[] wideMsg;delete[] wideTitle;}int main(){    cout<<"请输入要加密的内容"<<endl;    string input;    cin>>input;    MD5 md5 = MD5(G2U(input.c_str()));    const char* out = md5.outstr().c_str();    cout<<out<<endl;    return 0;}