CryptEncrypt 和CryptDecrypt 的使用

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/********************************************************************created:2014/08/25created:25:8:2014   15:24file ext:cppauthor:Benpurpose:简单的演示下windows API 的加解密函数的使用Remarks:*********************************************************************/#include "stdafx.h"#include<windows.h>#include <wincrypt.h>#include<iostream>using namespace std;HCRYPTPROVm_hCryptProv; HCRYPTKEYm_hKey; HCRYPTHASHm_hHash; #define KEYCONTAINER _T("BenTestKeyContainer")#define KEYLENGTH  0x00800000BOOL CreateCryptSession(LPTSTR tszPassword){//---------------------------------------------------------------// Get the handle to the default provider. if (m_hCryptProv == NULL){if(!CryptAcquireContext(&m_hCryptProv, KEYCONTAINER, MS_ENHANCED_PROV, PROV_RSA_FULL, 0)){if (GetLastError() == NTE_BAD_KEYSET){if(!CryptAcquireContext(&m_hCryptProv, KEYCONTAINER, MS_ENHANCED_PROV, PROV_RSA_FULL, CRYPT_NEWKEYSET)){return FALSE;}}else{return FALSE;}}}//-----------------------------------------------------------// Create a hash object. if (m_hHash == NULL){if(!CryptCreateHash(m_hCryptProv, CALG_MD5, 0, 0, &m_hHash)){return FALSE;}}//-----------------------------------------------------------// Hash in the password data. if(m_hKey) {CryptDestroyKey(m_hKey); m_hKey = NULL;}if(!CryptHashData(m_hHash, (BYTE *)tszPassword, _tcslen(tszPassword) * sizeof(TCHAR), 0)) {return FALSE;}//-----------------------------------------------------------// Derive a session key from the hash object. if(!CryptDeriveKey(m_hCryptProv, CALG_RC4, m_hHash, KEYLENGTH, &m_hKey)){ return FALSE;}return TRUE;}BOOL DestroyCryptSession(){//--------------------------------------------------------------------// Destroy session key. if(m_hKey) {CryptDestroyKey(m_hKey); m_hKey = NULL;}//--------------------------------------------------------------------// Destroy hash object. if(m_hHash) {CryptDestroyHash(m_hHash); m_hHash = NULL;}//--------------------------------------------------------------------// Release provider handle. if(m_hCryptProv) {CryptReleaseContext(m_hCryptProv, 0); m_hCryptProv = NULL;}return TRUE;}BOOL EncryptData(PBYTE pbBuffer, DWORD dwBufferLen, LPDWORD lpdwCount, BOOL bFinal=FALSE){if (m_hKey == NULL || pbBuffer == NULL || dwBufferLen == 0 || lpdwCount == NULL){return FALSE;}//-----------------------------------------------------------// Encrypt data. return CryptEncrypt(m_hKey, NULL, bFinal,0, pbBuffer, lpdwCount, dwBufferLen);}// 解密数据BOOL DecryptData(PBYTE pbBuffer, LPDWORD lpdwCount, BOOL bFinal=FALSE){if (m_hKey == NULL || pbBuffer == NULL || lpdwCount == NULL){return FALSE;}//-----------------------------------------------------------// Decrypt the block of data. if(!CryptDecrypt(m_hKey, 0, bFinal, 0, pbBuffer, lpdwCount)){return FALSE;}return TRUE;}int _tmain(int argc, _TCHAR* argv[]){int a = 1222;//-----------------------------------------------------------// 加密 数据 if (!CreateCryptSession(TEXT("c10509"))){cout << "CreateCryptSession Failed.. " << endl;return FALSE;}DWORD dwCount = sizeof(int);if (!EncryptData((PBYTE)&a, sizeof(int), &dwCount)){cout << "Encrypt Data Failed... " << endl;return FALSE;}else{cout << "Encrypt Data Successed... " << endl;}DestroyCryptSession();  // 注意这句的调用与前面 CreateCryptSession 成对//-----------------------------------------------------------{// =======================================================// ====        解密部分  =============if (CreateCryptSession(TEXT("c10509")) == FALSE){return FALSE;}// 解密//DWORD dwDecryptCount = sizeof(decryptText);if (DecryptData((PBYTE)&a, &dwCount)){cout << "Decrypt Data Successed..." << endl;}else{cout << "DeCrypt Data Failed... " << endl;}DestroyCryptSession(); // =======================================================}return 0;}
可以参考的链接： http://blog.csdn.net/cnbragon/article/details/715058
MSDN: http://msdn.microsoft.com/zh-cn/aa382044
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