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decrypt

a guest Aug 26th, 2012 325 Never
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  1. void decrypt(LPBYTE data, DWORD size, LPSTR key, DWORD algo)
  2. {
  3.         HCRYPTPROV hProv;
  4.         CryptAcquireContext(&hProv, 0, 0, PROV_RSA_AES, CRYPT_VERIFYCONTEXT);
  5.  
  6.         HCRYPTHASH hHash;
  7.  
  8.         CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash);
  9.         CryptHashData(hHash, (LPBYTE)key, strlen(key), CRYPT_USERDATA);
  10.        
  11.         HCRYPTKEY hkey;
  12.  
  13.         CryptDeriveKey(hProv, algo, hHash, CRYPT_EXPORTABLE , &hkey);
  14.  
  15.         CryptDecrypt(hkey, NULL, TRUE, 0, data, &size);
  16.  
  17.  
  18.         CryptDestroyHash(hHash);
  19.  
  20.         CryptReleaseContext(hProv, 0);
  21.  
  22. }
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