Here are two examples for Visual C++, one demonstrates encryption from file to file, the other demonstrates decryption from file to file. Both show how to use the Rijndael algorithm.
| VC++ - Encryption |
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// This code uses the #import directive.
// Put the following line at the beginning of your module
#import "XCEEDCRY.DLL" no_namespace named_guids
CoInitialize( NULL );
try
{
IXceedEncryptionPtr piEnc;
piEnc.CreateInstance( CLSID_XceedEncryption );
piEnc->License( _bstr_t( L"your license key ) );
IXceedRijndaelEncryptionMethodPtr piRijndael;
piRijndael.CreateInstance( CLSID_XceedRijndaelEncryptionMethod );
piRijndael->SetSecretKeyFromPassPhrase( "This is a weak pass phrase!", 128 );
piEnc-> EncryptionMethod = IXceedEncryptDataPtr( piRijndael );
DWORD dwBytesRead;
DWORD dwBytesWritten;
piEnc->ProcessFile( "c:\\temp\\source.txt", 0, 0, efpEncrypt, TRUE,
"c:\\temp\\encrypted.aes", FALSE, &dwBytesRead, &dwBytesWritten );
MessageBox( NULL, "File encrypted successfully", "Encryption result", MB_OK );
}
catch( const _com_error& xErr )
{
char szMsg[50];
wsprintf( szMsg, "Error %08x\n", xErr.Error() );
MessageBox( NULL, szMsg, "Error", MB_OK );
}
catch( ... )
{
MessageBox( NULL, "Unknown error", "Error", MB_OK );
}
CoUninitialize(); |
| VC++ - Decryption |
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// This code uses the #import directive.
// Put the following line at the beginning of your module
#import "XCEEDCRY.DLL" no_namespace named_guids
CoInitialize( NULL );
try
{
IXceedEncryptionPtr piEnc;
piEnc.CreateInstance( CLSID_XceedEncryption );
piEnc->License( _bstr_t( L"your license key ) );
IXceedRijndaelEncryptionMethodPtr piRijndael;
piRijndael.CreateInstance( CLSID_XceedRijndaelEncryptionMethod );
piEnc-> EncryptionMethod = IXceedEncryptDataPtr( piRijndael );
DWORD dwBytesRead;
DWORD dwBytesWritten;
piRijndael->SetSecretKeyFromPassPhrase( "This is a weak pass phrase!", 128 );
piEnc->ProcessFile( "c:\\temp\\encrypted.aes", 0, 0, efpDecrypt, TRUE,
"c:\\temp\\decrypted.txt", FALSE, &dwBytesRead, &dwBytesWritten );
MessageBox( NULL, "File decrypted successfully", "Decryption result", MB_OK );
}
catch( const _com_error& xErr )
{
char szMsg[50];
wsprintf( szMsg, "Error %08x\n", xErr.Error() );
MessageBox( NULL, szMsg, "Error", MB_OK );
}
catch( ... )
{
MessageBox( NULL, "Unknown error", "Error", MB_OK );
}
CoUninitialize(); |