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本帖子原来是fleshwound的投稿文章，被root转入论坛。

作者:ecceccecc
URL:http://www.smatrix.org

   网上的文件加密软件多如牛毛，文件加密的核心是对对称密钥的保护。网上基于口令的文件加密很弱的，自己动手用工行u盾可以做一个文件加密程序，绝对的安全。AES大家goole上一找就行了。对称密钥核心部分用下面的代码就可以了。


#include <windows.h>
#include <tchar.h>
#include <wincrypt.h>
#include <stdio.h>




int _tmain(int argc, _TCHAR* argv[])
{
    HCRYPTPROV hProv;
    HCRYPTKEY  hKey;
    BYTE *pbKeyBlob = NULL;
    DWORD dwBlobLen;
    BYTE *pbData = NULL;
    DWORD cbData;
    DWORD i;
    
    
    //LPTSTR MSCSP=TEXT("Logoxin CSP v1.0");
    //LPSTR MSACSP="Logoxin CSP v1.0";
    
    LPTSTR MSCSP=TEXT("SafeSign CSP Version 1.0");
    LPSTR MSACSP="SafeSign CSP Version 1.0";
    
    
    BYTE pbBuffer[128];
    BYTE *pbConst= (BYTE *)"The data that is to be Encrypted.";
    DWORD dwBufferLen = (DWORD)strlen((char *)pbConst)+1;
    memcpy(pbBuffer,pbConst,dwBufferLen);


    if(!CryptAcquireContext(&hProv, NULL, MSCSP, PROV_RSA_FULL, 0))
        printf("Error %x CryptAcquireContext!n", GetLastError());


    if(!CryptGetProvParam(hProv, PP_ENUMCONTAINERS, pbData, &cbData, CRYPT_FIRST))
        printf("Error %x CryptGetProvParam!n", GetLastError());

    pbData = new BYTE[cbData];

    //Get the Container Name
    if(!CryptGetProvParam(hProv, PP_ENUMCONTAINERS, pbData, &cbData, CRYPT_FIRST))
        printf("Error %x CryptGetProvParam!n", GetLastError());

    //ReleaseContext
      if(!CryptReleaseContext(hProv,0))
        printf("Error %x during ReleaseContext!n", GetLastError());

      
     //Get the Container
     if(!CryptAcquireContextA(&hProv, (LPCSTR)pbData, MSACSP, PROV_RSA_FULL, 0))
        printf("Error %x CryptAcquireContext!n", GetLastError());

    if(!CryptGetUserKey(hProv,AT_KEYEXCHANGE,&hKey))
        printf("Error %x CryptGetUserKey!n", GetLastError());

    
    // Determine the size of the key BLOB and allocate memory.
    if(!CryptExportKey(hKey, 0, PUBLICKEYBLOB , 0, NULL, &dwBlobLen))
        printf("Error %x computing BLOB length!n", GetLastError());
    if((pbKeyBlob = (BYTE *)malloc(dwBlobLen)) == NULL)
         printf("Out of memory!n");
  
    // Export the key into a simple key BLOB.
     if(!CryptExportKey(hKey, 0, PUBLICKEYBLOB , 0, pbKeyBlob, &dwBlobLen))
         printf("Error %x during CryptExportKey!n", GetLastError());

     //Encrypt PlainText
     if(!CryptEncrypt(hKey,NULL,TRUE,0,pbBuffer,&dwBufferLen,128))
         printf("Error %x during CryptEncrypt!n", GetLastError());

     printf("the Ciper isn");
     for(i=0;i<dwBufferLen;i++)
         printf("%02X",pbBuffer);
     printf("n");

    
     //Decrypt CipherText
     if(!CryptDecrypt(hKey,NULL,TRUE,0,pbBuffer,&dwBufferLen))
          printf("Error %x during CryptDecrypt!n", GetLastError());

     printf("the Plain  isn");
     for(i=0;i<dwBufferLen;i++)
         printf("%c",pbBuffer);
     printf("n");


    
     if(hKey)
     {
         if(!CryptDestroyKey(hKey))
             printf("Error %x during CryptDestoryKey!n", GetLastError());

     }


    
    
     //ReleaseContext
      if(!CryptReleaseContext(hProv,0))
        printf("Error %x during ReleaseContext!n", GetLastError());


      
    
      return 1;
}
(你可以随意转载，但请保留原作者信息，有任何关于密码学和USBKEY,网银的问题可以来交流！
by ecceccecc）