MD5加密实现

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#pragma once
//Author:ArcherSC//JLUnamespace ENCRPYTION{class MD5{private:    unsigned int m_Content[16];    unsigned int m_ContentLen;    unsigned int m_TotalLen;    static unsigned int m_T[64];    unsigned int m_A, m_B, m_C, m_D;private:    inline void FF(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s);    inline void GG(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s);    inline void HH(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s);    inline void II(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s);    inline unsigned int roateLeft(unsigned int a, unsigned int c);    void transform();public:    //初始化    void beginCal();    //表明不再输入数据了，将添加填充位    void endCal();    //初始化后，输入数据，在调用endCal前，都可以继续添加数据    void addData(const char* data, unsigned int size);    //结束运算后，取得编码    char* getCode();    void    clearMemoryHelper(char* p);};}#include "MD5.h"#include <cstdlib>#include <cstring>//Author:ArcherSC//JLUnamespace ENCRPYTION{using namespace std;unsigned int MD5::m_T[64] = {          0xD76aa478, 0xE8C7B756, 0x242070DB, 0xC1BDCEEE,          0xF57C0FAF, 0x4787C62A, 0xA8304613, 0xFD469501,          0x698098D8, 0x8B44F7AF, 0xFFFF5BB1, 0x895CD7BE,          0x6B901122, 0xFD987193, 0xA679438E, 0x49B40821,          0xF61E2562, 0xC040B340, 0x265E5A51, 0xE9B6C7AA,          0xD62F105D, 0x02441453, 0xD8A1E681, 0xE7D3FBC8,          0x21E1CDE6, 0xC33707D6, 0xF4D50D87, 0x455A14ED,          0xA9E3E905, 0xFCEFA3F8, 0x676F02D9, 0x8D2A4C8A,          0xFFFA3942, 0x8771F681, 0x6D9D6122, 0xFDE5380C,          0xA4BEEA44, 0x4BDECFA9, 0xF6BB4B60, 0xBEBFBC70,          0x289B7EC6, 0xEAA127FA, 0xD4EF3085, 0x04881D05,          0xD9D4D039, 0xE6DB99E5, 0x1FA27CF8, 0xC4AC5665,          0xF4292244, 0x432AFF97, 0xAB9423A7, 0xFC93A039,          0x655B59C3, 0x8F0CCC92, 0xFFEFF47D, 0x85845DD1,          0x6FA87E4F, 0xFE2CE6E0, 0xA3014314, 0x4E0811A1,          0xF7537E82, 0xBD3AF235, 0x2AD7D2BB, 0xEB86D391          };void MD5::FF(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s){    a = b + roateLeft(a + ((b & c) | ((~b) & d)) + m_Content[k] + m_T[i], s);}void MD5::GG(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s){    a = b + roateLeft(a + ((b & d) | (c & (~d))) + m_Content[k] + m_T[i], s);}void MD5::HH(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s){    a = b + roateLeft(a + (b ^ c ^ d) + m_Content[k] + m_T[i], s);}void MD5::II(unsigned int& a, unsigned int b, unsigned int c, unsigned int d, int k, int i, int s){    a = b + roateLeft(a + (c ^ (b | (~d))) + m_Content[k] + m_T[i], s);}unsigned int MD5::roateLeft(unsigned int a, unsigned int c){    return ( (a << c) | (a >> (32-c)) );}void MD5::transform(){    unsigned int AA, BB, CC, DD;    AA = m_A;    BB = m_B;    CC = m_C;    DD = m_D;    //1 round    FF(AA, BB, CC, DD, 0, 0, 7);    FF(DD, AA, BB, CC, 1, 1, 12);    FF(CC, DD, AA, BB, 2, 2, 17);    FF(BB, CC, DD, AA, 3, 3, 22);    FF(AA, BB, CC, DD, 4, 4, 7);    FF(DD, AA, BB, CC, 5, 5, 12);    FF(CC, DD, AA, BB, 6, 6, 17);    FF(BB, CC, DD, AA, 7, 7, 22);    FF(AA, BB, CC, DD, 8, 8, 7);    FF(DD, AA, BB, CC, 9, 9, 12);    FF(CC, DD, AA, BB, 10, 10, 17);    FF(BB, CC, DD, AA, 11, 11, 22);    FF(AA, BB, CC, DD, 12, 12, 7);    FF(DD, AA, BB, CC, 13, 13, 12);    FF(CC, DD, AA, BB, 14, 14, 17);    FF(BB, CC, DD, AA, 15, 15, 22);    //2 round    GG(AA, BB, CC, DD, 1, 16, 5);    GG(DD, AA, BB, CC, 6, 17, 9);    GG(CC, DD, AA, BB, 11, 18, 14);    GG(BB, CC, DD, AA, 0, 19, 20);    GG(AA, BB, CC, DD, 5, 20, 5);    GG(DD, AA, BB, CC, 10, 21, 9);    GG(CC, DD, AA, BB, 15, 22, 14);    GG(BB, CC, DD, AA, 4, 23, 20);    GG(AA, BB, CC, DD, 9, 24, 5);    GG(DD, AA, BB, CC, 14, 25, 9);    GG(CC, DD, AA, BB, 3, 26, 14);    GG(BB, CC, DD, AA, 8, 27, 20);    GG(AA, BB, CC, DD, 13, 28, 5);    GG(DD, AA, BB, CC, 2, 29, 9);    GG(CC, DD, AA, BB, 7, 30, 14);    GG(BB, CC, DD, AA, 12, 31, 20);    //3 round    HH(AA, BB, CC, DD, 5, 32, 4);    HH(DD, AA, BB, CC, 8, 33, 11);    HH(CC, DD, AA, BB, 11, 34, 16);    HH(BB, CC, DD, AA, 14, 35, 23);    HH(AA, BB, CC, DD, 1, 36, 4);    HH(DD, AA, BB, CC, 4, 37, 11);    HH(CC, DD, AA, BB, 7, 38, 16);    HH(BB, CC, DD, AA, 10, 39, 23);    HH(AA, BB, CC, DD, 13, 40, 4);    HH(DD, AA, BB, CC, 0, 41, 11);    HH(CC, DD, AA, BB, 3, 42, 16);    HH(BB, CC, DD, AA, 6, 43, 23);    HH(AA, BB, CC, DD, 9, 44, 4);    HH(DD, AA, BB, CC, 12, 45, 11);    HH(CC, DD, AA, BB, 15, 46, 16);    HH(BB, CC, DD, AA, 2, 47, 23);    //4 round    II(AA, BB, CC, DD, 0, 48, 6);    II(DD, AA, BB, CC, 7, 49, 10);    II(CC, DD, AA, BB, 14, 50, 15);    II(BB, CC, DD, AA, 5, 51, 21);    II(AA, BB, CC, DD, 12, 52, 6);    II(DD, AA, BB, CC, 3, 53, 10);    II(CC, DD, AA, BB, 10, 54, 15);    II(BB, CC, DD, AA, 1, 55, 21);    II(AA, BB, CC, DD, 8, 56, 6);    II(DD, AA, BB, CC, 15, 57, 10);    II(CC, DD, AA, BB, 6, 58, 15);    II(BB, CC, DD, AA, 13, 59, 21);    II(AA, BB, CC, DD, 4, 60, 6);    II(DD, AA, BB, CC, 11, 61, 10);    II(CC, DD, AA, BB, 2, 62, 15);    II(BB, CC, DD, AA, 9, 63, 21);    m_A = m_A + AA;    m_B = m_B + BB;    m_C = m_C + CC;    m_D = m_D + DD;}//初始化void MD5::beginCal(){    memset(m_Content, 0, 64);    m_ContentLen = 0;    m_TotalLen = 0;    m_A = 0x67452301;    m_B = 0xEFCDAB89;    m_C = 0x98BADCFE;    m_D = 0x10325476;}void MD5::endCal(){    memset((char*)m_Content + m_ContentLen, 0x80, 1);    if (m_ContentLen < 56){     memset((char*)m_Content + m_ContentLen + 1, 0, 55 - m_ContentLen);    }    else{     memset((char*)m_Content + m_ContentLen + 1, 0, 63 - m_ContentLen);     transform();     memset((char*)m_Content, 0, 56);    }    unsigned int h, l;    h = 0;    l = m_TotalLen;    h |= ((l & 0x80000000) >> 31);    h <<= 1;    l <<= 1;    h |= ((l & 0x80000000) >> 31);    h <<= 1;    l <<= 1;    h |= ((l & 0x80000000) >> 31);    h <<= 1;    l <<= 1;    memcpy(m_Content + 14, &l, 4);    memcpy(m_Content + 15, &h, 4);    transform();}void MD5::addData(const char* data, unsigned int size){    unsigned int i = 0;    unsigned int remain = 64 - m_ContentLen;    if (remain > size)     remain = size;    memcpy(((char*)m_Content) + m_ContentLen, data, remain);    i += remain;    m_ContentLen += remain;    m_TotalLen += remain;    if (m_ContentLen < 64)     return;    transform();    while (i + 64 <= size){     memcpy(m_Content, data + i, 64);     transform();     i += 64;     m_TotalLen += 64;    }    m_ContentLen = size - i;    m_TotalLen += m_ContentLen;    memcpy(m_Content, data + i, m_ContentLen);}char* MD5::getCode(){    char * code = new char[16];    memcpy(code, &m_A, 4);    memcpy(code + 4, &m_B, 4);    memcpy(code + 8, &m_C, 4);    memcpy(code + 12, &m_D, 4);    return code;}void    MD5::clearMemoryHelper(char* p){    delete []p;}}