DES算法已經很經典了,因此用它來文件加密,也是簡單不過。
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C_DesEncryptFile::EncryptFile(LPCTSTR lpSourceFile, LPCTSTR lpszDestFile, const BYTE key[8], bool bFlag)
--------------------------------------------------------------------------------------------------------
lpSourceFile ---源文件名
lpszDestFile ---目標文件名
key[8]---密碼,不能超過64bit
bFlag--加密解密標誌
- #if !defined(AFX_C_DESENCRYPTFILE_H__3667F854_C709_40B4_AFD3_265D4B1B0618__INCLUDED_)
- #define AFX_C_DESENCRYPTFILE_H__3667F854_C709_40B4_AFD3_265D4B1B0618__INCLUDED_
- #if _MSC_VER > 1000
- #pragma once
- #endif // _MSC_VER > 1000
- #include <tchar.h>
- namespace Encrypt {
- class C_DesEncryptFile
- {
- typedef unsigned char BYTE;
- typedef BYTE* LPBYTE;
- typedef const BYTE* LPCBYTE;
- typedef const TCHAR *LPCSTR;
- public:
- C_DesEncryptFile();
- virtual ~C_DesEncryptFile();
- public:
- bool EncryptFile(LPCBYTE lpSource, LPBYTE lpDest, unsigned int nSize, const BYTE key[8], bool bFlag);
- bool EncryptFile(LPCTSTR lpSourceFile, LPCTSTR lpszDestFile, const BYTE key[8], bool bFlag);
- private:
- HANDLE OpenFile(LPCTSTR lpSourceFile, bool bReadMode);
- LPBYTE GetFileBuffer(HANDLE &hFile, DWORD &dwFileSize);
- };
- };
- #endif // !defined(AFX_C_DESENCRYPTFILE_H__3667F854_C709_40B4_AFD3_265D4B1B0618__INCLUDED_)
下面是實現代碼:
- #include "stdafx.h"
- #include "RSA.h"
- #include "C_DesEncryptFile.h"
- #include "C_Des.h"
- #include <io.h>
- #ifdef _DEBUG
- #undef THIS_FILE
- static char THIS_FILE[]=__FILE__;
- #define new DEBUG_NEW
- #endif
- namespace Encrypt {
- C_DesEncryptFile::C_DesEncryptFile()
- {
- }
- C_DesEncryptFile::~C_DesEncryptFile()
- {
- }
- bool C_DesEncryptFile::EncryptFile(LPCTSTR lpSourceFile, LPCTSTR lpszDestFile, const BYTE key[8], bool bFlag)
- {
- HANDLE hSHandle;
- HANDLE hDHandle;
- hSHandle = OpenFile(lpSourceFile, true);
- if (INVALID_HANDLE_VALUE == hSHandle)
- {
- return false;
- }
- DWORD dwFileSize = 0;
- LPBYTE lpSource = GetFileBuffer(hSHandle, dwFileSize);
- if (NULL == lpSource)
- {
- return false;
- }
- hDHandle = OpenFile(lpszDestFile, false);
- if (INVALID_HANDLE_VALUE == hSHandle)
- {
- delete [] lpSource;
- return false;
- }
- LPBYTE lpDest = new BYTE [dwFileSize];
- bool bret = EncryptFile(lpSource, lpDest, dwFileSize, key, bFlag);
- DWORD dwWriteNum = 0;
- WriteFile(hDHandle, lpDest, dwFileSize, &dwWriteNum, NULL);
- CloseHandle(hDHandle);
- delete [] lpSource;
- delete [] lpDest;
- return bret;
- }
- bool C_DesEncryptFile::EncryptFile(LPCBYTE lpSource, LPBYTE lpDest, unsigned int nSize, const BYTE key[8], bool bFlag)
- {
- C_Des DesEncrpty;
- BOOLEAN bRet = DesEncrpty.CDesEnter(lpSource, lpDest, nSize, key, bFlag);
- if (bRet)
- {
- return true;
- }
- return false;
- }
- HANDLE C_DesEncryptFile::OpenFile(LPCTSTR lpSourceFile, bool bReadMode)
- {
-
- DWORD dwMode = GENERIC_READ ;
- DWORD dwShared = FILE_SHARE_READ;
- DWORD dwCreate = OPEN_EXISTING;
- if (!bReadMode)
- {
- dwMode |= GENERIC_WRITE;
- dwShared |= FILE_SHARE_WRITE;
- dwCreate = CREATE_ALWAYS;
- }
- HANDLE hTemplateFile = NULL;
- hTemplateFile = ::CreateFile(lpSourceFile, dwMode, dwShared, NULL,
- dwCreate, FILE_ATTRIBUTE_NORMAL, hTemplateFile);
- return hTemplateFile;
- }
- LPBYTE C_DesEncryptFile::GetFileBuffer(HANDLE &hFile, DWORD &dwFileSize)
- {
- DWORD dwFileHigh = 0;;
-
- DWORD dwRealSize = dwFileSize = GetFileSize(hFile, &dwFileHigh);
- if (dwFileSize % 8 != 0)
- {
- DWORD dwRatio = dwFileSize / 8;
- dwFileSize = (dwRatio + 1) * 8;
- }
- LPBYTE pSourBuffer = new BYTE [dwFileSize];
- DWORD dwReadNum = 0;
- ReadFile(hFile, pSourBuffer, dwRealSize, &dwReadNum, NULL);
- CloseHandle(hFile);
- DWORD dwOffset = dwFileSize - dwRealSize;
- ZeroMemory(pSourBuffer + dwRealSize, dwOffset);
- return pSourBuffer;
- }
- };
DES 的代碼:
- #if !defined(AFX_C_DES_H__387D4F78_8819_43DC_BCC9_CB6C6BFB5A2D__INCLUDED_)
- #define AFX_C_DES_H__387D4F78_8819_43DC_BCC9_CB6C6BFB5A2D__INCLUDED_
- #if _MSC_VER > 1000
- #pragma once
- #endif // _MSC_VER > 1000
- namespace Encrypt {
- typedef unsigned char BYTE;
- typedef BYTE* LPBYTE;
- typedef const BYTE* LPCBYTE;
- typedef int BOOLEAN;
-
-
- class C_Des
- {
-
- public:
- C_Des();
- ~C_Des();
- public:
- BOOLEAN CDesEnter(LPCBYTE in, LPBYTE out, int datalen, const BYTE key[8], BOOL type);
- BOOLEAN CDesMac(LPCBYTE mac_data, LPBYTE mac_code, int datalen, const BYTE key[8]);
- private:
- void XOR(const BYTE in1[8], const BYTE in2[8], BYTE out[8]);
- LPBYTE Bin2ASCII(const BYTE byte[64], BYTE bit[8]);
- LPBYTE ASCII2Bin(const BYTE bit[8], BYTE byte[64]);
- void GenSubKey(const BYTE oldkey[8], BYTE newkey[16][8]);
- void endes(const BYTE m_bit[8], const BYTE k_bit[8], BYTE e_bit[8]);
- void undes(const BYTE m_bit[8], const BYTE k_bit[8], BYTE e_bit[8]);
- void SReplace(BYTE s_bit[8]);
- };
- };
- #endif // !defined(AFX_C_DES_H__387D4F78_8819_43DC_BCC9_CB6C6BFB5A2D__INCLUDED_)
DES 實現:(是網上找到的)
- #include "stdafx.h"
- #include "RSA.h"
- #include "C_Des.h"
- #ifdef _DEBUG
- #undef THIS_FILE
- static char THIS_FILE[]=__FILE__;
- #define new DEBUG_NEW
- #endif
- namespace Encrypt {
- C_Des::C_Des()
- {
- }
- C_Des::~C_Des()
- {
- }
-
-
- BOOLEAN C_Des::CDesEnter(LPCBYTE in, LPBYTE out, int datalen, const BYTE key[8], BOOL type)
- {
-
-
-
-
-
-
- if((!in) || (!out) || (datalen<1) || (!key) || (type && ((datalen % 8) !=0)))
- return FALSE;
-
-
- if(type==0)
- {
-
-
-
-
- BYTE te8bit[8]={0,0,0,0,0,0,0,0};
-
-
-
-
-
- int te_fixlen = datalen - (datalen % 8);
-
-
- for(int i = 0; i < (datalen % 8); i++)
- te8bit[i] = in[te_fixlen + i];
-
-
- for(i = 0; i < te_fixlen; i += 8)
- endes(in + i, key, out + i);
-
-
- if(datalen % 8 != 0)
- endes(te8bit, key, out + datalen / 8 * 8);
- }
- else
- {
-
- for(int i = 0; i < datalen; i += 8)
- undes(in + i, key, out + i);
- }
- return TRUE;
- }
-
-
- BOOLEAN C_Des::CDesMac(LPCBYTE mac_data, LPBYTE mac_code, int datalen, const BYTE key[8])
- {
-
-
-
-
-
-
- if((!mac_data) || (!mac_code) || (datalen < 16) || (datalen % 8 != 0) || (!key))
- return FALSE;
- endes(mac_data, key, mac_code);
- for(int i = 8; i < datalen; i += 8)
- {
- XOR(mac_code, mac_data + i, mac_code);
- endes(mac_code, key, mac_code);
- }
- return TRUE;
- }
-
-
- void C_Des::XOR(const BYTE in1[8], const BYTE in2[8], BYTE out[8])
- {
- for(int i = 0; i < 8; i++)
- out[i] = in1[i] ^ in2[i];
- }
-
-
- LPBYTE C_Des::Bin2ASCII(const BYTE byte[64], BYTE bit[8])
- {
- for(int i = 0; i < 8; i++)
- {
- bit[i] = byte[i * 8] * 128 + byte[i * 8 + 1] * 64 +
- byte[i * 8 + 2] * 32 + byte[i * 8 + 3] * 16 +
- byte[i * 8 + 4] * 8 + byte[i * 8 + 5] * 4 +
- byte[i * 8 + 6] * 2 + byte[i * 8 + 7];
- }
- return bit;
- }
-
-
- LPBYTE C_Des::ASCII2Bin(const BYTE bit[8], BYTE byte[64])
- {
- for(int i=0; i < 8; i++)
- for(int j = 0; j < 8; j++)
- byte[i * 8 + j] = ( bit[i] >> (7 - j) ) & 0x01;
- return byte;
- }
-
-
- void C_Des::GenSubKey(const BYTE oldkey[8], BYTE newkey[16][8])
- {
- int i, k, rol = 0;
-
-
- int pc_1[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};
-
- int pc_2[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};
-
- int ccmovebit[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
-
- BYTE oldkey_byte[64];
- BYTE oldkey_byte1[64];
- BYTE oldkey_byte2[64];
- BYTE oldkey_c[56];
- BYTE oldkey_d[56];
- BYTE newkey_byte[16][64];
-
- ASCII2Bin(oldkey, oldkey_byte);
-
-
- for(i = 0; i < 56; i++)
- oldkey_byte1[i] = oldkey_byte[pc_1[i] - 1];
-
- for(i = 0; i < 28; i++)
- oldkey_c[i] = oldkey_byte1[i], oldkey_c[i + 28] = oldkey_byte1[i],
- oldkey_d[i] = oldkey_byte1[i + 28], oldkey_d[i + 28] = oldkey_byte1[i + 28];
-
-
- for(i = 0; i < 16; i++)
- {
-
- rol += ccmovebit[i];
-
- for(k = 0; k < 28; k++)
- oldkey_byte2[k] = oldkey_c[k + rol], oldkey_byte2[k + 28] = oldkey_d[k + rol];
-
- for(k = 0; k < 48; k++)
- newkey_byte[i][k] = oldkey_byte2[pc_2[k] - 1];
-
- }
-
- for(i = 0; i < 16; i++)
- Bin2ASCII(newkey_byte[i], newkey[i]);
- }
-
-
- void C_Des::endes(const BYTE m_bit[8], const BYTE k_bit[8], BYTE e_bit[8])
- {
-
- int 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
- };
-
- int ip_1[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
- };
-
- int 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
- };
- BYTE m_bit1[8] = {0};
- BYTE m_byte[64] = {0};
- BYTE m_byte1[64] = {0};
- BYTE key_n[16][8] = {0};
- BYTE l_bit[17][8] = {0};
- BYTE r_bit[17][8] = {0};
- BYTE e_byte[64] = {0};
- BYTE e_byte1[64] = {0};
- BYTE r_byte[64] = {0};
- BYTE r_byte1[64] = {0};
- int i, j;
-
-
- GenSubKey(k_bit, key_n);
-
- ASCII2Bin(m_bit, m_byte);
-
- for(i = 0; i < 64; i++)
- m_byte1[i] = m_byte[ip[i] - 1];
-
- Bin2ASCII(m_byte1, m_bit1);
-
- for(i = 0; i < 4; i++)
- l_bit[0][i] = m_bit1[i], r_bit[0][i] = m_bit1[i + 4];
-
-
- for(i = 1; i <= 16; i++)
- {
-
- for(j = 0; j < 4; j++)
- l_bit[i][j] = r_bit[i-1][j];
-
- ASCII2Bin(r_bit[i-1], r_byte);
-
- for(j = 0; j < 48; j++)
- r_byte1[j] = r_byte[e[j] - 1];
- Bin2ASCII(r_byte1, r_bit[i-1]);
-
-
- for(j = 0; j < 6; j++)
- r_bit[i-1][j] = r_bit[i-1][j] ^ key_n[i-1][j];
-
-
- SReplace(r_bit[i - 1]);
-
-
- for(j = 0; j < 4; j++)
- {
- r_bit[i][j] = l_bit[i-1][j] ^ r_bit[i-1][j];
- }
- }
-
- for(i = 0; i < 4; i++)
- e_bit[i] = r_bit[16][i], e_bit[i + 4] = l_bit[16][i];
-
- ASCII2Bin(e_bit, e_byte);
-
- for(i = 0; i < 64; i++)
- e_byte1[i] = e_byte[ip_1[i] - 1];
-
- Bin2ASCII(e_byte1, e_bit);
- }
-
-
- void C_Des::undes(const BYTE m_bit[8], const BYTE k_bit[8], BYTE e_bit[8])
- {
-
- int 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
- };
-
- int ip_1[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
- };
-
- int 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
- };
- BYTE m_bit1[8] = {0};
- BYTE m_byte[64] = {0};
- BYTE m_byte1[64] = {0};
- BYTE key_n[16][8] = {0};
- BYTE l_bit[17][8] = {0};
- BYTE r_bit[17][8] = {0};
- BYTE e_byte[64] = {0};
- BYTE e_byte1[64] = {0};
- BYTE l_byte[64] = {0};
- BYTE l_byte1[64] = {0};
- int i = 0, j = 0;
-
-
- GenSubKey(k_bit, key_n);
-
- ASCII2Bin(m_bit, m_byte);
-
- for(i = 0; i < 64; i++)
- m_byte1[i] = m_byte[ip[i] - 1];
-
- Bin2ASCII(m_byte1, m_bit1);
-
- for(i = 0; i < 4; i++)
- r_bit[16][i] = m_bit1[i], l_bit[16][i] = m_bit1[i + 4];
-
-
- for(i = 16; i > 0; i--)
- {
-
- for(j = 0; j < 4; j++)
- r_bit[i-1][j] = l_bit[i][j];
-
- ASCII2Bin(l_bit[i], l_byte);
-
- for(j = 0; j < 48; j++)
- l_byte1[j] = l_byte[e[j] - 1];
- Bin2ASCII(l_byte1, l_bit[i]);
-
-
- for(j = 0; j < 6; j++)
- l_bit[i][j] = l_bit[i][j] ^ key_n[i-1][j];
-
-
- SReplace(l_bit[i]);
-
-
- for(j = 0; j < 4; j++)
- {
- l_bit[i-1][j] = r_bit[i][j] ^ l_bit[i][j];
- }
- }
-
- for(i = 0; i < 4; i++)
- e_bit[i] = l_bit[0][i], e_bit[i + 4] = r_bit[0][i];
-
- ASCII2Bin(e_bit, e_byte);
-
- for(i = 0; i < 64; i++)
- e_byte1[i] = e_byte[ip_1[i] - 1];
-
- Bin2ASCII(e_byte1, e_bit);
- }
-
-
- void C_Des::SReplace(BYTE s_bit[8])
- {
- int 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
- };
- BYTE s[][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
- }
- };
- BYTE s_byte[64] = {0};
- BYTE s_byte1[64] = {0};
- BYTE row = 0, col = 0;
- BYTE s_out_bit[8] = {0};
-
-
- ASCII2Bin(s_bit, s_byte);
- for(int i = 0; i < 8; i++)
- {
-
- row = s_byte[i * 6] * 2 + s_byte[i * 6 + 5];
- col = s_byte[i * 6 + 1] * 8 + s_byte[i * 6 + 2] * 4 + s_byte[i * 6 + 3] * 2 + s_byte[i * 6 + 4];
- s_out_bit[i] = s[i][row][col];
- }
-
- s_out_bit[0] = (s_out_bit[0] << 4) + s_out_bit[1];
- s_out_bit[1] = (s_out_bit[2] << 4) + s_out_bit[3];
- s_out_bit[2] = (s_out_bit[4] << 4) + s_out_bit[5];
- s_out_bit[3] = (s_out_bit[6] << 4) + s_out_bit[7];
-
- ASCII2Bin(s_out_bit, s_byte);
-
- for(i = 0; i < 32; i++)
- s_byte1[i] = s_byte[p[i] - 1];
-
- Bin2ASCII(s_byte1, s_bit);
- }
-
- };
RAS 算法:
- #if !defined(AFX_C_RSA_H__DFA1ACD6_44FD_49A6_BCE5_9EB1A6A6CC1D__INCLUDED_)
- #define AFX_C_RSA_H__DFA1ACD6_44FD_49A6_BCE5_9EB1A6A6CC1D__INCLUDED_
- #if _MSC_VER > 1000
- #pragma once
- #endif // _MSC_VER > 1000
- #include <string>
- using namespace std;
- class C_RSA
- {
- public:
- struct S_CODE
- {
- int nEncryptCode;
- int nDecryptCode;
- int nN;
- };
- typedef S_CODE ENCRYPTTYPE;
- public:
- C_RSA();
- virtual ~C_RSA();
- public:
-
- ENCRYPTTYPE & ProduceEncryptInFo(int nP, int nQ);
-
- bool Encrypt(string &strContent, string & strEncryptContent);
-
- bool Decrypt(string & strEncryptContent, string &strContent, int nDecryptCode, int nN);
-
- ENCRYPTTYPE & AutoProduceEncryptInFo(void);
- private:
- bool IsPrime(int nX);
- int Gcd(int nA, int nB);
- void Euler(int nE, int nFin);
- void ProduceEncryCode(int nFin);
- int Power(int nA, int nN, int nM);
-
- private:
- int m_nP;
- int m_nQ;
- ENCRYPTTYPE m_nEncrytInFo;
-
- };
- #endif // !defined(AFX_C_RSA_H__DFA1ACD6_44FD_49A6_BCE5_9EB1A6A6CC1D__INCLUDED_)
實現:
- #include "stdafx.h"
- #include "RSA.h"
- #include "C_RSA.h"
- #include "math.h"
- #ifdef _DEBUG
- #undef THIS_FILE
- static char THIS_FILE[]=__FILE__;
- #define new DEBUG_NEW
- #endif
- C_RSA::C_RSA()
- {
- }
- C_RSA::~C_RSA()
- {
- }
- inline
- bool C_RSA::IsPrime(int nX)
- {
- int i;
- int nTop = static_cast<int>(sqrt(nX));
- nTop += 1;
-
- for (i = 2; i <= nTop; i++)
- {
- if (nX % i == 0)
- {
- break;
- }
- }
- if (i > nTop)
- {
- return true;
- }
- return false;
- }
- inline
- int C_RSA::Power(int nA, int nN, int nM)
- {
- int nZ = 1, nTemp;
- for (nTemp = nA; nN > 0; nN >>= 1)
- {
- if (nN % 2 == 1)
- {
- nZ = (nZ * nTemp) % nM;
- }
- nTemp = (nTemp * nTemp) % nM;
- }
- return nZ;
- }
- int C_RSA::Gcd(int nA, int nB)
- {
-
- if (nA == 0)
- {
- return nB;
- }
- else
- {
- return Gcd(nB % nA, nA);
- }
-
- }
- inline
- void C_RSA::ProduceEncryCode(int nFin)
- {
- for (int i = 3; i < nFin; ++i)
- {
- if (IsPrime(i) && 1 == Gcd(nFin, i))
- {
- m_nEncrytInFo.nEncryptCode = i;
- break;
- }
- }
- }
- C_RSA::ENCRYPTTYPE & C_RSA::AutoProduceEncryptInFo(void)
- {
- int nP, nQ;
- while(true)
- {
- srand(time(0));
- nP = rand() % 100;
- nQ = rand() % 100;
- if (IsPrime(nQ) && IsPrime(nP))
- break;
- }
- return ProduceEncryptInFo(nP, nQ);
- }
- C_RSA::ENCRYPTTYPE& C_RSA::ProduceEncryptInFo(int nP, int nQ)
- {
- m_nP = nP;
- m_nQ = nQ;
- m_nEncrytInFo.nN = m_nP * m_nQ;
- int nFin = (m_nP - 1) * (m_nQ - 1);
-
- ProduceEncryCode(nFin);
- Euler(m_nEncrytInFo.nEncryptCode, nFin);
- return m_nEncrytInFo;
- }
- inline
- void C_RSA::Euler(int nE, int nFin)
- {
- int u1 = 1;
- int u2 = 0;
- int u3 = nFin;
- int v1 = 0;
- int v2 = 1;
- int v3 = nE;
- int v = 1;
- int t1, t2, t3;
- int q;
- int uu, vv;
- int inverse, z;
- while (v3 != 0)
- {
- q = u3 / v3;
- t1 = u1 - q * v1;
- t2 = u2 - q * v2;
- t3 = u3 - q * v3;
- u1 = v1;
- u2 = v2;
- u3 = v3;
- v1 = t1;
- v2 = t2;
- v3 = t3;
- z = 1;
- }
- uu = u1;
- vv = u2;
-
- if (vv < 0)
- {
- inverse = vv + nFin;
- }
- else
- {
- inverse = vv;
- }
- m_nEncrytInFo.nDecryptCode = inverse;
- }
- bool C_RSA::Encrypt(string &strContent, string & strEncryptContent)
- {
- if (strContent.empty())
- {
- return false;
- }
- strEncryptContent = "";
- string::size_type nIndex = 0;
- string::size_type nSize = strContent.size();
- for (nIndex = 0; nIndex < nSize; ++nIndex)
- {
- char szBuffer[1024] = {0};
- int nECode = Power(strContent[nIndex],
- m_nEncrytInFo.nEncryptCode,
- m_nEncrytInFo.nN);
- sprintf(szBuffer, "%d%s", nECode, "+");
- strEncryptContent += szBuffer;
-
- }
- return true;
- }
- bool C_RSA::Decrypt(string & strEncryptContent, string &strContent, int nDecryptCode, int nN)
- {
- if (strEncryptContent.empty())
- {
- return false;
- }
- strContent = "";
- unsigned size = strEncryptContent.size();
- char *pstrEnCode = new char [size];
- CopyMemory(pstrEnCode, strEncryptContent.c_str(), size);
- char seps[] = "+";
- char *token;
- token = strtok( pstrEnCode, seps );
- while( token != NULL )
- {
- int nCode = atoi(token);
- char nChar = static_cast<char>(Power(nCode, nDecryptCode, nN));
- strContent += nChar;
- token = strtok( NULL, seps );
- }
- delete[] pstrEnCode;
- return true;
- }
結束了,以文記之!