AES加密技术在文件与字符串上的应用

C++版本

AES.h文件

#pragma once#include "memory.h"class AES  {public:AES(unsigned char* key);virtual ~AES();unsigned char* Cipher(unsigned char* input);unsigned char* InvCipher(unsigned char* input);void* Cipher(void* input, int length=0);void* InvCipher(void* input, int length);private:unsigned char Sbox[256];unsigned char InvSbox[256];unsigned char w[11][4][4];void KeyExpansion(unsigned char* key, unsigned char w[][4][4]);unsigned char FFmul(unsigned char a, unsigned char b);void SubBytes(unsigned char state[][4]);void ShiftRows(unsigned char state[][4]);void MixColumns(unsigned char state[][4]);void AddRoundKey(unsigned char state[][4], unsigned char k[][4]);void InvSubBytes(unsigned char state[][4]);void InvShiftRows(unsigned char state[][4]);void InvMixColumns(unsigned char state[][4]);};

AES.cpp文件

#include "aes.h"#include "string.h"AES::AES(unsigned char* key){unsigned char sBox[] ={ /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f */ 0x63,0x7c,0x77,0x7b,0xf2,0x6b,0x6f,0xc5,0x30,0x01,0x67,0x2b,0xfe,0xd7,0xab,0x76, /*0*/  0xca,0x82,0xc9,0x7d,0xfa,0x59,0x47,0xf0,0xad,0xd4,0xa2,0xaf,0x9c,0xa4,0x72,0xc0, /*1*/0xb7,0xfd,0x93,0x26,0x36,0x3f,0xf7,0xcc,0x34,0xa5,0xe5,0xf1,0x71,0xd8,0x31,0x15, /*2*/ 0x04,0xc7,0x23,0xc3,0x18,0x96,0x05,0x9a,0x07,0x12,0x80,0xe2,0xeb,0x27,0xb2,0x75, /*3*/ 0x09,0x83,0x2c,0x1a,0x1b,0x6e,0x5a,0xa0,0x52,0x3b,0xd6,0xb3,0x29,0xe3,0x2f,0x84, /*4*/ 0x53,0xd1,0x00,0xed,0x20,0xfc,0xb1,0x5b,0x6a,0xcb,0xbe,0x39,0x4a,0x4c,0x58,0xcf, /*5*/0xd0,0xef,0xaa,0xfb,0x43,0x4d,0x33,0x85,0x45,0xf9,0x02,0x7f,0x50,0x3c,0x9f,0xa8, /*6*/  0x51,0xa3,0x40,0x8f,0x92,0x9d,0x38,0xf5,0xbc,0xb6,0xda,0x21,0x10,0xff,0xf3,0xd2, /*7*/ 0xcd,0x0c,0x13,0xec,0x5f,0x97,0x44,0x17,0xc4,0xa7,0x7e,0x3d,0x64,0x5d,0x19,0x73, /*8*/ 0x60,0x81,0x4f,0xdc,0x22,0x2a,0x90,0x88,0x46,0xee,0xb8,0x14,0xde,0x5e,0x0b,0xdb, /*9*/ 0xe0,0x32,0x3a,0x0a,0x49,0x06,0x24,0x5c,0xc2,0xd3,0xac,0x62,0x91,0x95,0xe4,0x79, /*a*/0xe7,0xc8,0x37,0x6d,0x8d,0xd5,0x4e,0xa9,0x6c,0x56,0xf4,0xea,0x65,0x7a,0xae,0x08, /*b*/0xba,0x78,0x25,0x2e,0x1c,0xa6,0xb4,0xc6,0xe8,0xdd,0x74,0x1f,0x4b,0xbd,0x8b,0x8a, /*c*/ 0x70,0x3e,0xb5,0x66,0x48,0x03,0xf6,0x0e,0x61,0x35,0x57,0xb9,0x86,0xc1,0x1d,0x9e, /*d*/0xe1,0xf8,0x98,0x11,0x69,0xd9,0x8e,0x94,0x9b,0x1e,0x87,0xe9,0xce,0x55,0x28,0xdf, /*e*/ 0x8c,0xa1,0x89,0x0d,0xbf,0xe6,0x42,0x68,0x41,0x99,0x2d,0x0f,0xb0,0x54,0xbb,0x16  /*f*/};unsigned char invsBox[256] = { /*  0    1    2    3    4    5    6    7    8    9    a    b    c    d    e    f  */  0x52,0x09,0x6a,0xd5,0x30,0x36,0xa5,0x38,0xbf,0x40,0xa3,0x9e,0x81,0xf3,0xd7,0xfb, /*0*/ 0x7c,0xe3,0x39,0x82,0x9b,0x2f,0xff,0x87,0x34,0x8e,0x43,0x44,0xc4,0xde,0xe9,0xcb, /*1*/0x54,0x7b,0x94,0x32,0xa6,0xc2,0x23,0x3d,0xee,0x4c,0x95,0x0b,0x42,0xfa,0xc3,0x4e, /*2*/ 0x08,0x2e,0xa1,0x66,0x28,0xd9,0x24,0xb2,0x76,0x5b,0xa2,0x49,0x6d,0x8b,0xd1,0x25, /*3*/ 0x72,0xf8,0xf6,0x64,0x86,0x68,0x98,0x16,0xd4,0xa4,0x5c,0xcc,0x5d,0x65,0xb6,0x92, /*4*/ 0x6c,0x70,0x48,0x50,0xfd,0xed,0xb9,0xda,0x5e,0x15,0x46,0x57,0xa7,0x8d,0x9d,0x84, /*5*/ 0x90,0xd8,0xab,0x00,0x8c,0xbc,0xd3,0x0a,0xf7,0xe4,0x58,0x05,0xb8,0xb3,0x45,0x06, /*6*/ 0xd0,0x2c,0x1e,0x8f,0xca,0x3f,0x0f,0x02,0xc1,0xaf,0xbd,0x03,0x01,0x13,0x8a,0x6b, /*7*/0x3a,0x91,0x11,0x41,0x4f,0x67,0xdc,0xea,0x97,0xf2,0xcf,0xce,0xf0,0xb4,0xe6,0x73, /*8*/ 0x96,0xac,0x74,0x22,0xe7,0xad,0x35,0x85,0xe2,0xf9,0x37,0xe8,0x1c,0x75,0xdf,0x6e, /*9*/0x47,0xf1,0x1a,0x71,0x1d,0x29,0xc5,0x89,0x6f,0xb7,0x62,0x0e,0xaa,0x18,0xbe,0x1b, /*a*/0xfc,0x56,0x3e,0x4b,0xc6,0xd2,0x79,0x20,0x9a,0xdb,0xc0,0xfe,0x78,0xcd,0x5a,0xf4, /*b*/ 0x1f,0xdd,0xa8,0x33,0x88,0x07,0xc7,0x31,0xb1,0x12,0x10,0x59,0x27,0x80,0xec,0x5f, /*c*/ 0x60,0x51,0x7f,0xa9,0x19,0xb5,0x4a,0x0d,0x2d,0xe5,0x7a,0x9f,0x93,0xc9,0x9c,0xef, /*d*/ 0xa0,0xe0,0x3b,0x4d,0xae,0x2a,0xf5,0xb0,0xc8,0xeb,0xbb,0x3c,0x83,0x53,0x99,0x61, /*e*/ 0x17,0x2b,0x04,0x7e,0xba,0x77,0xd6,0x26,0xe1,0x69,0x14,0x63,0x55,0x21,0x0c,0x7d  /*f*/}; memcpy(Sbox, sBox, 256);memcpy(InvSbox, invsBox, 256);KeyExpansion(key, w);}AES::~AES(){}unsigned char* AES::Cipher(unsigned char* input){unsigned char state[4][4];int i,r,c;for(r=0; r<4; r++){for(c=0; c<4 ;c++){state[r][c] = input[c*4+r];}}AddRoundKey(state,w[0]);for(i=1; i<=10; i++){SubBytes(state);ShiftRows(state);if(i!=10){MixColumns(state);}AddRoundKey(state,w[i]);}for(r=0; r<4; r++){for(c=0; c<4 ;c++){input[c*4+r] = state[r][c];}}return input;}unsigned char* AES::InvCipher(unsigned char* input){unsigned char state[4][4];int i,r,c;for(r=0; r<4; r++){for(c=0; c<4 ;c++){state[r][c] = input[c*4+r];}}AddRoundKey(state, w[10]);for(i=9; i>=0; i--){InvShiftRows(state);InvSubBytes(state);AddRoundKey(state, w[i]);if(i){InvMixColumns(state);}}for(r=0; r<4; r++){for(c=0; c<4 ;c++){input[c*4+r] = state[r][c];}}return input;}void* AES::Cipher(void* input, int length){unsigned char* in = (unsigned char*) input;int i;if(!length){while(*(in+length++));in = (unsigned char*) input;}for(i=0; i<length; i+=16){Cipher(in+i);}return input;}void* AES::InvCipher(void* input, int length){unsigned char* in = (unsigned char*) input;int i;for(i=0; i<length; i+=16){InvCipher(in+i);}return input;}void AES::KeyExpansion(unsigned char* key, unsigned char w[][4][4]){int i,j,r,c;unsigned char rc[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36};for(r=0; r<4; r++){for(c=0; c<4; c++){w[0][r][c] = key[r+c*4];}}for(i=1; i<=10; i++){for(j=0; j<4; j++){unsigned char t[4];for(r=0; r<4; r++){t[r] = j ? w[i][r][j-1] : w[i-1][r][3];}if(j == 0){unsigned char temp = t[0];for(r=0; r<3; r++){t[r] = Sbox[t[(r+1)%4]];}t[3] = Sbox[temp];t[0] ^= rc[i-1];}for(r=0; r<4; r++){w[i][r][j] = w[i-1][r][j] ^ t[r];}}}}unsigned char AES::FFmul(unsigned char a, unsigned char b){unsigned char bw[4];unsigned char res=0;int i;bw[0] = b;for(i=1; i<4; i++){bw[i] = bw[i-1]<<1;if(bw[i-1]&0x80){bw[i]^=0x1b;}}for(i=0; i<4; i++){if((a>>i)&0x01){res ^= bw[i];}}return res;}void AES::SubBytes(unsigned char state[][4]){int r,c;for(r=0; r<4; r++){for(c=0; c<4; c++){state[r][c] = Sbox[state[r][c]];}}}void AES::ShiftRows(unsigned char state[][4]){unsigned char t[4];int r,c;for(r=1; r<4; r++){for(c=0; c<4; c++){t[c] = state[r][(c+r)%4];}for(c=0; c<4; c++){state[r][c] = t[c];}}}void AES::MixColumns(unsigned char state[][4]){unsigned char t[4];int r,c;for(c=0; c< 4; c++){for(r=0; r<4; r++){t[r] = state[r][c];}for(r=0; r<4; r++){state[r][c] = FFmul(0x02, t[r])^ FFmul(0x03, t[(r+1)%4])^ FFmul(0x01, t[(r+2)%4])^ FFmul(0x01, t[(r+3)%4]);}}}void AES::AddRoundKey(unsigned char state[][4], unsigned char k[][4]){int r,c;for(c=0; c<4; c++){for(r=0; r<4; r++){state[r][c] ^= k[r][c];}}}void AES::InvSubBytes(unsigned char state[][4]){int r,c;for(r=0; r<4; r++){for(c=0; c<4; c++){state[r][c] = InvSbox[state[r][c]];}}}void AES::InvShiftRows(unsigned char state[][4]){unsigned char t[4];int r,c;for(r=1; r<4; r++){for(c=0; c<4; c++){t[c] = state[r][(c-r+4)%4];}for(c=0; c<4; c++){state[r][c] = t[c];}}}void AES::InvMixColumns(unsigned char state[][4]){unsigned char t[4];int r,c;for(c=0; c< 4; c++){for(r=0; r<4; r++){t[r] = state[r][c];}for(r=0; r<4; r++){state[r][c] = FFmul(0x0e, t[r])^ FFmul(0x0b, t[(r+1)%4])^ FFmul(0x0d, t[(r+2)%4])^ FFmul(0x09, t[(r+3)%4]);}}}

aes_encryptor.h

#ifndef SRC_UTILS_AES_ENCRYPTOR_H#define SRC_UTILS_AES_ENCRYPTOR_H#include <string>class AES;class AesEncryptor{public:    AesEncryptor(unsigned char* key);    ~AesEncryptor(void);    std::string EncryptString(std::string strInfor);    std::string DecryptString(std::string strMessage);    void EncryptTxtFile(const char* inputFileName, const char* outputFileName);    void DecryptTxtFile(const char* inputFileName, const char* outputFileName);private:    void Byte2Hex(const unsigned char* src, int len, char* dest);    void Hex2Byte(const char* src, int len, unsigned char* dest);    int  Char2Int(char c);private:    AES* m_pEncryptor;};#endif        // SRC_UTILS_AES_ENCRYPTOR_H

aes_encryptor.cpp

#include "aes.h"#include "aes_encryptor.h"#include <fstream>using namespace std;AesEncryptor::AesEncryptor(unsigned char* key){    m_pEncryptor = new AES(key);}AesEncryptor::~AesEncryptor(void){    delete m_pEncryptor;}void AesEncryptor::Byte2Hex(const unsigned char* src, int len, char* dest) {    for (int i=0; i<len; ++i) {        sprintf_s(dest + i * 2, 3, "%02X", src[i]);        }}void AesEncryptor::Hex2Byte(const char* src, int len, unsigned char* dest) {    int length = len / 2;    for (int i=0; i<length; ++i) {        dest[i] = Char2Int(src[i * 2]) * 16 + Char2Int(src[i * 2 + 1]);    }}int AesEncryptor::Char2Int(char c) {    if ('0' <= c && c <= '9') {        return (c - '0');    }    else if ('a' <= c && c<= 'f') {        return (c - 'a' + 10);    }    else if ('A' <= c && c<= 'F') {        return (c - 'A' + 10);    }    return -1;}string AesEncryptor::EncryptString(string strInfor) {    int nLength = strInfor.length();    int spaceLength = 16 - (nLength % 16);    unsigned char* pBuffer = new unsigned char[nLength + spaceLength];    memset(pBuffer, '\0', nLength + spaceLength);    memcpy_s(pBuffer, nLength + spaceLength, strInfor.c_str(), nLength);    m_pEncryptor->Cipher(pBuffer, nLength + spaceLength);        // 这里需要把得到的字符数组转换成十六进制字符串     char* pOut = new char[2 * (nLength + spaceLength) + 1]; // don't forget to terminate your string    memset(pOut, '\0', 2 * (nLength + spaceLength));    Byte2Hex(pBuffer, nLength + spaceLength, pOut);    string retValue(pOut);    delete[] pBuffer;    delete[] pOut;    return retValue;}string AesEncryptor::DecryptString(string strMessage) {    int nLength = strMessage.length() / 2;    unsigned char* pBuffer = new unsigned char[nLength];    memset(pBuffer, '\0', nLength);    Hex2Byte(strMessage.c_str(), strMessage.length(), pBuffer);    m_pEncryptor->InvCipher(pBuffer, nLength);    string retValue((char*)pBuffer);    delete[] pBuffer;    return retValue;}void AesEncryptor::EncryptTxtFile(const char* inputFileName, const char* outputFileName) {    ifstream ifs;    // Open file:    ifs.open(inputFileName);    if (!ifs) {        return ;    }    // Read config data:    string strInfor;    string strLine;    while (!ifs.eof()) {        char temp[1024];        memset(temp, '\0', 1024);        ifs.read(temp, 1000);        strInfor += temp;    }    ifs.close();    // Encrypt    strLine = EncryptString(strInfor);    // Writefile     ofstream ofs;    ofs.open(outputFileName);    if (!ofs) {        return ;    }    ofs << strLine;    ofs.close();}void AesEncryptor::DecryptTxtFile(const char* inputFile, const char* outputFile) {    ifstream ifs;    // Open file:    ifs.open(inputFile);    if (!ifs) {        return ;    }    // Read config data:    string strInfor;    string strLine;    while (!ifs.eof()) {        char temp[1024];        memset(temp, '\0', 1024);        ifs.read(temp, 1000);        strInfor += temp;    }    ifs.close();    // Encrypt    strLine = DecryptString(strInfor);    // Writefile     ofstream ofs;    ofs.open(outputFile);    if (!ofs) {        return ;    }    ofs << strLine;    ofs.close();}

示例

#include "Poco/File.h"#include "Poco/Path.h"#include "Poco/FileStream.h"#include "Poco/StreamCopier.h"#include <iostream>#include "aes_encryptor.h"using Poco::File;using Poco::Path;using Poco::FileInputStream;using Poco::FileOutputStream;using Poco::StreamCopier;//AES密钥unsigned char key[]={0x05, 0xce, 0x2d, 0x3f};int main(int argc, char **argv){    if (argc != 3)    {        Path p(argv[0]);        std::cerr << "usage: " << p.getBaseName() << " <source dir> <destination dir>" << std::endl;        std::cerr << "       compress html|css|js using Gzip," << std::endl;        std::cerr << "       reduce band width during transfer." << std::endl;return 1;    }#if 0    AesEncryptor aes(key);    aes.EncryptTxtFile(argv[1], argv[2]);#else    AesEncryptor aes(key);    aes.DecryptTxtFile(argv[1], argv[2]);#endifreturn 0;}

WEB版本

ajax数据使用CryptoJS的加密传输

先列几个函数

getKey

encryptASE

decryptASE

decryptASEUnzip

decryptASEJson

parseHexString